Th400 cracked bellhousing rattling

Dynamic builds the very best racing transmissions anywhere. What makes this bellhousing so unique is that it is part of the performance automatic pro fit system. It would be safe to drive it home or to a repair shop, but i would have it replaced asap. A th350 does have a somewhat weaker bellhousing the a th400, but breakage is usually due to bad mounting in either case. The th400 core will go out for a full rebuild and installation in a future project, but in the interim, an ati street rod transmission and converter package will do the job, and add increased. Jmo ive heard of people putting that to a stock th400. If you are sure the noise is coming from your gear box and happens even in neutral, then the output shaft bearing in your transmission may be starting to go bad. Would a faulty torque converter cause this problem. It was a bit of work to cutoff the stock th400 bellhousing, but not too difficult. About 5 days later i was driving not hard and came to stop and when i wanted to go it was not moving till i gave it more. Although most vehicle transmission noises relate to internal parts and cannot be seen, their behavior and sound frequency always deal with a moving part according to engine rpm or pressure.

The noise only happens at idle speed, as soon as you touch the accelerator it goes. When our th400 bellhousing opened up, grand canyonstyle, we ordered up a j. The second one was a slow torture test because the pump slowly failed over a couple miles. Beattie went on to tell us that the sprag for second gear is also less than bulletproof, and will fail above 400 hp in the th350. Chevy turbo 400 automatic transmission information it still. I was having the same issue with my th400 in my 82 k20, turns out the bottom bolt on the transmission drivers side was backed out and the transmission was separating from the block close to 14 inch. Climbed under the car and found the crack in the bellhousing. Mine cracked all the way around and was dumping atf all over. Random rattling noise from bellhousing area the truck stop. Ls bell housing heres an install video for a ultra bell housing. Ive seen a few th350 cases cracked in the bellhousing area. I had to pull some idiot out of a big hole out offroading last night, and on the way home my transmission wasnt shifting right. They appear to have to be either 716 diameter and 12 long or 12 diameter and 12 long.

I wouldnt say that its common for turbo hydramatic 400s to crack in the bellhousing area as there are millions of them in service, many behind very high horsepower engines, offroad vehicles, etc. Developed to eliminate all weak points found in the original gm transmission cases, the rugged ati supercase and bell housing are sfi approved. Sep 14, 20 ive got an 89 v2500 burb with a 350, th400, np241 combo. Our stage 2 th400 includes all the components in the stage 1 rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manualautomatic valve body or. To correct the condition, follow the service procedure steps to replace the flexplate, transmission fluid pump, and torque converter. The concept of using a transbrake is to produce the fastest possible acceleration from a standing start. But it wont shift when in drive or when i select the gears manually and ive confirmed the linkage is not the issue. Chevys turbo hydramatic 400 th400 transmission is one of those legendary pieces of equipment that helped to define the musclecar generation, and it continues to be one of the most common and highly regarded transmissions in todays enthusiast market. Mounted to my th400 transmission and lined right up with the holes on the crossmember of my 1976. The th400 is an automatic shift, threespeed, longitudinally positioned transmission. The converter drive hub will also usually have damage and can be cracked. Its cable speedo, vacuum modulated, non torque converter lock up, electric kick down. A solid trans mount with any motor mount configuration can and will cause cracked bellhousings.

These strongerthanstock housings bolt to the front pump and fit underneath stock floors. The off brand planet gears are made of weak steel and crack like glass. Camaro shifter boot, manual transmission, all, for cars with console. This trans is a mix of a late 60s to early 70s th400 from a jeep commando. When cold you can hear it in park, in drive or reverse, worst on cold start. What could cause a crack in the bellhousing in a th30 auto. Both of mine started to crack at the little contoured area opened up for the starter. While a cracked housing may put an end to your day on the trail, it certainly will not put an end to your transmission.

Our stage 2 th400 includes all the components in the stage 1 rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manualautomatic valve body or forward pattern full manual upon request. Transmissions are all black magic to me, auto and manual. Jun 09, 2009 its almost cracked all the way around about 75% of the bellhousing and its cracked all the way through. Upgrading the turbo 400 in your corvette super chevy.

A vital part of an automobile engine equipped with automatic transmission. The case, bellhousing, and tailhousing are cast from 356t6 cast aluminum. We show you how to rebuild gms turbo 400 transmission specific to. Unfollow th400 trans brake to stop getting updates on your ebay feed. Please excuse us while were in the process of building our new web store. On this website you will find many performance heavy duty transmission parts the others dont sell.

A transbrake is activated by a drivercontrolled switch that connects to a solenoid mounted on the transmission. Discussion in the hokey ass message board started by. The novak guide to the gm th400 automatic transmission. Imagine this rattling around inside your torque converter.

Ford bellhousing adapters th400 transmission type free. I had a 14 diameter 168 tooth flexplate and it would not clear the ultrabell. While the unit is indeed one of the stoutest of its kind, trouble can still occur. Rattling noise comes from transmission when in gear and. The flexplate has cracked twice in the past 6 months. Jan 05, 2011 chevy engineering faults and th400 vs c6 bellhousing. Today is a great day to visit our store and order the parts you. I know they have a different bolt pattern for the different bellhousings styles on the different enginesbut i have found that the th400 for the chevys cost alot more than the bops. Part 17 how to align the bellhousing using offset dowel pins for the big block. Th400 transmission troubleshooting help, th400 rebuilding. All of these have a high pitched rattle that i cant stand, but there are ways to get around it. Chevy engineering faults and th400 vs c6 bellhousing.

This bellhousing is cnc machined to accept the 157 or 164 tooth flexplates and starters thus eliminating any guesswork for the retailer and end user. Installing an ati th400 in our c10 project hot rod. Ford th400 no bellhousings free shipping on orders. This cracked cause the convertor bolts backed out, and one of them got pinched inbetween the bellhousing and the convertor and hence the crack. I have a 3500rpm stall converter and the car ran slow. One adapter is cracked off and needs to be welded back on.

The bellhousing is cracked from the opening for the fork downward to the bottom center of the bh. A powerglide, th350, or stock th400 may be full with 910 qts on a fresh install, or in some cases it may take 15 qts. Chevrolet silverado 1500 questions loud knocking noise 5. This is what it sounds like when your bellhousing on a th400 cant take 650 hp anymore lol. Robertthanks for your question about the humming noise in your transmission.

In the turbo hydromatics category, we have several th400 versions to choose from. Just like with a dodge transmission, once power gets past 100150 rwhp over stock, the. Test the bellhousing for runout on both its bore and face as described in the troubleshooting section. A th400 doesnt consume anymore hp than a th350 in a rockcrawler application and is a better unit to start with.

This unique bellhousing is cast from a high strength aluminum alloy and is sfi 30. In the world of drag racing, cracked factory bellhousings are a welldocumented problem and aftermarket solutions are plentiful. Another thing that weakens them is if theyve been pulled to mate with the engine by using the attachment bolts. That said, a th350 is a pretty stout trans with some minor mods. I run a np205 transfer case now with a fixed yoke after the weld repair. For almost a decade, performance automatic has produced an incredibly versatile line of pro fit bellhousings. Almost sounds like a rod knock, or perhaps a loose torque converter nut hitting the bellhousing or something. Looking for a big block ford 429 and ford 460 bellhousing.

This information is for the nontransmission mechanic to help identify problem, know. Th400 performance transmissions and parts from patc. Blazer, because when they get old it will rattle when the torque converter locks up. I have the same kind of knocking noise but i know what the problem is. I can actually wiggle the drivers side of the housing back and forth. I have a 1978 amc 304 that i want to bolt up to a tf999. Hy busterswt, ive never done this job before but here goes with some suggestions which may help, t. On the way home i stopped at a traffic light and noticed an unusual dull sounding rattling noise coming from the firewallfloorengine area.

Random rattling noise from bellhousing area page 2 the. Pretty straight forward install just take your time. The th400 also suffers from the same problem, but doesnt break until the 800 hp mark. You need to clean the case well enough to locate any cracks prior to assembly. I also noticed that the car will clunk when it shifts into gear, and from first to second, and second to third. Th400 transmissions bte racing is a leader when it comes to high performance transmissions, including powerglides and street transmissions. All i have done so far is pull the governor out, and it looks great not that i know what im looking for. You will have to lovingly massage the floor pan with a 8lb mall because the bell housing and body of a th400 is slightly larger than the 700. Im gonna take a stab at this, correct me as needed. The surface should be smooth and free of burned spots and surface cracks. Solution this problem could be caused by a cracked or split transmission filter. Whether you need th400 wiring diagram information, th400 transmission rebuilders tips, th400 technical information, th400 diagnostics, th400 troubleshooting help, or just answers to your th400 transmission rebuilders question, the transmission rebuilders network is the place to go. Descriptions of the sound include clanking, chirping and a light knocking. Jul 24, 20 th400 trans has a rattling noise sounding like a very loud heat shield rattling with viberation.

Aftermarket building techniques take it well past that figure. Temporarily install the bellhousing to be used on the block it will be used with. When i was installing this transmission on my 1981 pontiac trans am, i busted the bell housing. I found rotten jellied mounts under the adapter and that probably contributed to excess. Transmission ultra bell from summit racing equipment, broke out the cutoff wheel, and promptly made a mess on the garage floor. Cracked a th400 case and support brackets with a np205. We did encounter one problem with our turbo 400 case and that was a cracked bellhousing, which was repaired by hot rods by dean before it went to hughes. Humming noises are usually an indication of a bad bearing. It is widely regarded to be a supremely durable and legendary transmission. Ive had stock bellhousing th400s behind 1500 hp, no issues. The torque converter used with an automatic transmission acts like a flywheel. This may be due to a flexplate crack around the crankshaft. Camaro flywheel dust cover, th350 or th400, 19671981. The first in this series was the pro fit small block ford pa26577.

Air gap is the clearance between the clutch disc, flywheel, and pressure plate with. Have you ever heard a knock or a rattle sound coming from under your bellhousing. It will do it at idle in park, at idle in drive or reverse but usually above 1100rpm it goes away while driving until you reach around 2000rpm then it rattles again. Ive got a almost tinny rattle seemingly from the bell housing area of the transmission. I was out towing with the subruban last night, everything went great. Im having trouble with my th400, roughly the same issues described by scallop. The turbohydramatic 400 th400 automatic transmission can be found behind large, powerful engines on chevrolet and gm cars and trucks from the factory, as well as jeep, cadillac, oldsmobile and many others. Ls th400 install requires a bolt on adapter duration. How to repair the kickdown switch in a turbo 400 transmission aug 17, 2011 brian lohnes bangshift news 1 nearly every automatic transmission has some kind of kick down apparatus and they are all different. Ive got a th400 thats not shifting out of first even up to about 40 mph. Then a precision register is milled into the pump body that is concentric to that location. Jun 16, 2008 ok guys, im digging up an older thread, so i need some help. Help removing th400 emergency brake the stovebolt forums.

If the bell bolts loosen off, the housing will crack. While a cracked housing may put an end to your day on the trail, it certainly will not put an end to your transmission case. I replaced my broken stock transmission mount with this one. The factory stator can develop hairline cracks even at lower. The problem turned out to be a cracked flex plate which. We have been adding products as we have the chance to. They are tough as nails certified flexplate shields and allow for special motor and transmission combinations to be easily mated together. The bellhousing on the th400 is a bit on the thin side and prone to failure. Its almost cracked all the way around about 75% of the bellhousing and its cracked all the way through. Flywheel and flexplate dust covers th400 transmission. With the clutch disc and pressure plate installed and ready, and the transmission bolted to its bellhousing, insert the release fork in its proper orientation if not fully symmetrical into the bellhousing, over the transmission bearing retainer snout and then snap on the retention spring if applicable. Before i knew what it was, it would come and go but started sounding worse the last few days. Ultra bells are manufactured from onepiece cast aluminum, making them 5 times stronger than stock bellhousings.

How to troubleshoot a turbohydramatic 400 transmission it. Often, broken engine or transmission mounts are the contributing factor to th400 bellhousing cracks. There might be a chance of the bellhousing hitting the floor. This allows the adapter plate to share the pump bushing bore as a centerline,and not the pump bolt holes drilled in the pump. A cracked bell housing is caused by worn transmission andor engine mounts causing excessive vibration or movement which eventually will cause the bell housing to crack. You will also need to cut off the side ears, youll know them when you see them, for clearance. You see, firstly, the bellhousing on the 390 is round, and the later cadillac is oddshaped next, the starter on the 390 bolts to the bellhousing, whereas the starter for the th400 bolts up to the block. I have a 1966 impala ss with a 327 and th400 auto transmission. The supercase is an sfi certified transmission case for powerglide, turbo 400 and turbo 350 transmissions. Designed inhouse at ati, and cast here in the usa, and machined at ati on 4axis horizontal cnc machines, the t400 supercase features improved fluid pathways to assure better performance and will accept any of atis sfi bellhousings, along with the reid bell with slight modifications and browell cans. Th400 sfi bellhousing dynamic racing transmissions. The th400 9 inch tail housing with the 27 spline output shaft has the same. The th400 short tail and your trans are the same length. The 390 has the ring gear attached to the torque converter, whereas the engines using the th400 utilise a normal flexplate.

This is important as the results of this test can vary with a different block or bellhousing. I ended up putting in dextron 3 and filled it a little more than required. Does some one make and bushing to fit the chevy converter on one side and the pilot hole of the big block ford crank on the other side. Well today my friend called me and wanted me to pull him out he was stuck in the mud so i go over and try to pull him out it wasnt working so i snatched him and finally got him out later once i started driving down the road i heard a rattling noise pulled over to take a look and my transmission bell housing is cracked all the way around anyone know where i can get another one and why it. Other worn vehicle parts can mimic the noise or feel of faulty transmission parts, so. Signs and sounds of transmission issues bluedevil products. Th400 with dana 20 rear output cracked adapter jeep used. I have a turbo 400 trans and converter that was behind a big block chevy also have a used jw bell to put turbo 400 behind a big block ford. Th400 bellhousing breaking2004 gto turbo ls1 youtube. I ran over a curb in my 08 chevy cobalt and cracked the transmission casing. Bellhousing cracked all the way around, driveshaft then exploded in the middle. Follow the service procedure steps to correct the condition. Using a sophisticated renishaw probing system the center of the pump bushing bore location in the pump body is located and recorded. These cracks are usually located where the main part of the case starts to.

How to repair a th400 transmission with a cracked bellhousing. Letting the trans hang fron 1 or 2 bolts while installing can also cause it. Transmission brakes transbrakes have been available for the th400 for decades. This bellhousing is certainly a stronger improvement and has sfi rating. You dont have to put alot into a th400 to handle 500 hp. Just bought the car in mid january, my first hot rod in quite a few years, had it trailered home and ive only driven it once. I had a cracked th400 case about 6 inches forward of the tail end of the trans case tail end.

It launched good and i got told last time i had a tranny leak. Performance has come up with these ultra bell bellhousings. While a cracked housing may put an end to your day on the trail, it. Bellhousing numbers on th400, what they mean chevy. Where over 30 years building racing transmissions gives you the winning edge. The new cast aluminum t400 supercase is the result of over 2 years of development. Ford 460 bellhousing bellhousings astro performance.