The bell housing needs replaced it has a hole in it. What is scraping my flywheel to cause a rattling noise in. I bought th350 for my car and was wondering what rear end gear would be best for me and also would converter would be right. Dec 06, 2009 i have a 350 sbc which i believe came from a 79 chevy kblazer. As with all jakes performance transmissions they include all new friction clutches, bands, steel plates, soft parts, filter, modulator if applicable, as well as hydraulic upgrades, and other modifications depending on power level. Feb 06, 2014 the bell housing needs replaced it has a hole in it. The th350 is such a popular transmission, and one of our most requested turnkey automatics. I wonder if any of you fellow bolters out there can help me. Chevrolet first produced the th350 transmission for the 1969 model year. One of the first signs of transmission problems is when your transmission shifts hard. On the way home i stopped at a traffic light and noticed an unusual dull sounding rattling noise coming from the firewallfloorengine area.
While gearstars entry level 2 th350 left will handle 450hp, gearstars level 4 will handle even more and is rated to 700hp. Jun 15, 2011 with a th350 or a th400, your car would be turning about 3,000 rpm at 70 mph. That was until my th350 literaly broke in half at the bellhousing after about 10 miles. A vital part of an automobile engine equipped with automatic transmission. I am really new to automatics, so is this a good idea. Got a knock and rattling noise coming from bellhousing. I was out towing with the subruban last night, everything went great. Many gm applications use bolts that thread directly into the converter.
Although the design of the th350 is fairly primitive compared to todays computercontrolled transmissions, major disassembly should be left to a. Troubleshooting is the stepby step process where you can logically diagnose a problem. Noise is consistent with engine rpm and makes noise in all gears. It is widely considered to be one of the greatest of automatic transmissions ever built. The novak guide to the gm th350 automatic transmission.
Sep 20, 2008 85 chevy silverado c10 short, wide, yellow, 2wd. On the other hand, that 3,000 rpm multiplied by an overdrive ratio of 0. Th350 transmission rebuild kit w sprags super high. This involves a process of elimination, usually starting from the simple, easytocheck items, then moving on to more difficult items in logical sequence. Our base model th350 has lived at over 600 hp reliably. Signs and sounds of transmission issues bluedevil products. Check the flexplate for cracks and chipped teeth on the ring gear. Ive seen a few th350 cases cracked in the bellhousing area. Gm turbo 350 transmission rebuild troubleshooting guide. The torque converter used with an automatic transmission acts like a flywheel. Air gap is the clearance between the clutch disc, flywheel, and pressure plate with. Start by checking your transmission fluid level and condition on the dipstick. These transmissions mate a threeelement turbine torque converter to a simpson planetary geartrain, providing three forward speeds plus reverse. Its almost cracked all the way around about 75% of the bellhousing and its cracked all the way through.
Ive seen case cracking problems on drag race cars that had a dual motor plate setup and a crossmember with one of those moroso steel mounts thats patterned after. You need to clean the case well enough to locate any cracks prior to assembly. Jul 17, 2018 1982 gmc k1500 4 x 4 350 with th350 transmission shew, do not know. Be sure to also check the case very closely for cracks. How to troubleshoot a chevy th350 transmission it still runs. The front band is replaced with an alto carbon fiber band for more holding power. When your transmission slams into gear it can be a sign of abnormal pressures, worn components or even a low fluid level. As for the distributor, the back of the engine problably dropped down when the bellhousing failed, and the cap hit the firewall. Most th350 and th400 transmissions used torque converters that attached to the flywheel with three bolts.
Able to handle a maximum of 450 horsepower, all our th350s come with improved shift characteristics, added clutches and superior assembly. Gm used the th350 in their vehicles starting in 1968 and was found in almost all rearwheel drive gm vehicles through 1984. However, once the transmission is put into gear, the frequency and volume of the rattling noise will increase, which spells trouble for your. The truck is a 71 c10 that was a 3503 speed std and is now a 350th350. Id guess the bellhousing was cracked for some time.
They are compact for the shorter jeeps, yet extremely versatile and durable. The th350 transmission was developed by general motors as a replacement for the twospeed powerglide transmission. Complete th350 transmission package novak conversions. Hyundai veloster bad transmission and crack flywheel noise duration.
Please note that ebays compatibility is limited to 3000 vehicles but it fits all th350 transmissions. Able to handle a maximum of 450 horsepower, all our th350 s come with improved shift characteristics, added clutches and superior assembly. I have 1990 pontiac trans am with 355, the engine produced 420hp at 6100rpm and 425tq at 4200rpm. Symptoms of a transmission oil pump torque converter diagnosis. Lowered, 60over 350 with dart iron eagle heads and comp cams xe268 cam, th350 w shift kit, 3. Th350 transmissions 3 speed automatic racing transmissions. If you have a gm car that falls within these model years, there is a good chance you have a th350. Every transmission gets carefully disassembled and is deepcleaned and inspected before assembly. Difference between bop and chevy th350 turbo buick forum. Reason why i am asking is that i am thinking of buying a built th350 chevy and was wondering if the only thing i will have to buy is the adapter plate. The 2002 ford explorer has 18 problems reported for rattling noise from transmission.
Random rattling noise from bellhousing area the truck stop. Diagnosing a transmission is the same as anything else. I have a 3500rpm stall converter and the car ran slow. The fully automatic transmission was equipped with three forward gears and one reverse gear. Nov 21, 2014 my chevy started this tick noise out of now where thought about it and yea its the flex plate. Then you will need to install the fj40 land cruiser slave cylinder to the bellhousing, and install the new rod provided in the kit. Trying to find the leak source which looks like its dripping from front. Hey im hoping someone out there can help me troubleshoot a ticking noise on a turbo 350. Ive got the engine in the frame and im trying to get the th350 attached to the sbc and they arent going together fully. Some heavyduty truck applications may have six torque converter bolts. 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. Descriptions of the sound include clanking, chirping and a light knocking. Aug 29, 2017 got a knock and rattling noise coming from bellhousing. Id like to pick up an overdrive auto for the highway.
Tci auto automatic transmissions chevy bellhousing bolt. Th350 transmission troubleshooting help, th350 rebuilding. Since its inception into the 1969 passenger cars, the th350 transmission is considered to be ol reliable, becoming a mainstay in the production lineup up until 1986. General motors oem turbo 350 transmission lowreverse clutch piston return spring, 19691986. Description 350 raptor and 350 mega raptor high performance th350 transmissions the 350 raptor street strip transmissions come with a high performance fairbanks transaction shift kit installed. Turbohydramatic or turbo hydramatic is the registered tradename for a family of automatic transmissions developed and produced by general motors. Still drives and shifts normal with no overheating or check engine light.
And what are rebuilt complete transmisions going for. Perfect for when the original bracket for the modulator usually breaks. Oct 28, 2015 most th350 and th400 transmissions used torque converters that attached to the flywheel with three bolts. The surface should be smooth and free of burned spots and surface cracks. If you find a low fluid level, ad bluedevil transmission. Also, if the accumulator housing walls are scored, the housing must be replaced. Climbed under the car and found the crack in the bellhousing. Jointly developed by chevy and buick, it is also referred to as the cbc. The old standby for many years, our th350 transmissions are a great value whether for a street machine or street rod. It rattles a lot, it sounds like theres a loose bolt in a tin can or something in prnd21 when rpms are over 1500, but goes quiet after shifting gears until it gets revved again. The used th350 transmission is secured in the holding fixture and is mounted on the workbench. Still drives and shifts normal with no overheating or. A restricted or clogged transmission filter makes the same whining noise as a faulty transmission pump. The truck is a 71 c10 that was a 3503 speed std and is now a 350 th350.
It launched good and i got told last time i had a tranny leak. Have you ever heard a knock or a rattle sound coming from under your bellhousing. Symptoms of a transmission oil pump torque converter. I have a 350 sbc which i believe came from a 79 chevy kblazer. The th350 takes about 4 quarts in the pan, and then requires additional based on the torque converter being used. With a th350 or a th400, your car would be turning about 3,000 rpm at 70 mph.
Is the only difference between the bop and chevy th350 just the bell housing. These transmissions mate a threeelement turbine torque converter to a simpson planetary geartrain, providing three forward speeds plus reverse the turbohydramatic or turbo hydramatic thm series was developed to. How to identify a th350 transmission it still runs. The turbo 350 transmission, commonly known as the th350, was a 3 speed automatic transmission that began phasing out the gm powerglide in 1969. The motor is a small block 350 a classic muscle car motor. What is a good price to pay for a good rebuildable core. The th350 is an automatic shift, threespeed transmission. The best thing to do is ask the mechanic this question. What is scraping my flywheel to cause a rattling noise in my 1987 chevy caprice. What could cause a crack in the bellhousing in a th30 auto. I understand the th350 went to a lock up converter around this time. Jun 09, 2009 its almost cracked all the way around about 75% of the bellhousing and its cracked all the way through. Fully blueprinted and equipped with high flow lube circuits, increased torque capacity and hard chrome oil rings sprags replaced with heavy duty units clutch packs are assembled for individual applications.
I have cleaned off a work area and rounded up the tools needed to take the unit apart for inspection. Anti rattle clunk spring shown in correct location. Its most common for manual transmissions to have a removable bellhousing where most automatics have an integrated one. Install new bellhousing to the chevy motor using old bolts. Took off inspection plate and checked converter bolts and checked for cracks in flexplate.
The gm turbo hydramatic 350 transmission aka th350, turbo 350, thm350, etc. Check the yellow spring inside the accum housing for breakage. Some units require a good power washing to remove dirt, mud, grease, and road grime before they are taken apart. Th350 street smart system transmission performance automatic. My chevy started this tick noise out of now where thought about it and yea its the flex plate. Make sure the filters good before replacing the pump. The th350 transmission was introduced in the 1969 model year as the successor to the gm powerglide automatic transmission. Its crucial when diagnosing a transmission pump or a torque converter. This tech tip is from the full book, gm turbo 350 transmissions. It just snaps on over the ball stud on the inside of the bellhousing. Transmission adapter, aluminum, mounting hardware, b. It is a very loud clatter type rattle that speeds up with speed not rpm. The noise only happens at idle speed, as soon as you touch the accelerator it goes.
These cracks are usually located where the main part of the case starts to. Whether you need th350 wiring diagram information, th350 transmission rebuilders tips, th350 technical information, th350 diagnostics, th350 troubleshooting help, or just answers to your th350 transmission rebuilders question, the transmission rebuilders network is the place to go. Th350 lowreverse clutch piston return spring 19691986. When cold you can hear it in park, in drive or reverse, worst on cold start. We respond throughout the work day with any questions. Ive got a almost tinny rattle seemingly from the bell housing area of the transmission.