Overhaul Tips
Before you tear into the transmission, we suggest you first study the troubleshootin/overhaul
manual, add a bottle of our "Automatic Transmission Protectant" and put
a few miles on the vehicle. This just might free valves and governors that are possible
stuck in valve bodies. Be sure to get computer trouble code(s), see owners manual
for technique to acquire malfunction codes. This will be a great assistance in diagnosing
possible problems.
Twenty-One Steps to Successful Transmission Repair:
1) Do your research locate any technical bulletins pertaining to your transmission,
ask your dealers parts department for bulletins.
2) Clean the entire transmisssion, including the valve body.
3) Check pump, valve body and case for warpage.
4) Flat file pumps, valve bodies, and cases. Just a few strokes with the file
to knock off high spots and handling burrs.
5) Check all pump gear clearances.
6) Check planet pinion end play and side to side motion.
7) Soak all planet assemblies.
8) Soak all friction materials for 15 - 30 minutes.
9) Make sure all steels are in usable condition or replace. Do not sand or tumble
steels when used against High Energy friction materials.
10) Inspect all surfaces upon which a band will ride.
11) Replace all rotating oil control rings.
12) Check all oil control rings and rubber products in the bores for proper fit.
13) Check all major support bushings and bushings that control lub oil.
14) Pre-lubricate all bushings and thrust washers.
15) Pre-lub pumps.
16) Pre-fill torque converter.
17) Use available manuals to ensure proper specifications and clearances.
18) Set correct clutch and band clearances.
19) Take the time to set the total end play.
20) Use a torque wrench on all pumps and valve bodies.
21) Always double flush the cooling and cooling return lines to the radiator to
remove particles trapped there.
Take your time, take your time, take you time!
Torque
Converter Installation/Preparation
Many torque converter problems can be avoided with proper preparation:
1) Pre-thread converter bolts by hand to make sure there is no sign of stripped
threads.
2) Check and clean crankshaft thoroughly. Change crank spacer (if applicable).
3) Use 320 grit sandpaper or Emory cloth to remove any metal shavings on crankshaft.
4) Check converter for any damage that may have occured during shipping.
5) Pre-fill converter with a minimum of (1) quart of transmission fluid.
6) Clean all paint off the pilot using 320 grit emory cloth.
7) Apply grease, not transmission gel, on the pilot.
8) Check flexplate for cracks and be sure there is no more than .006" run
out.
9) Make sure all engine dowel pins are in place and clean.
10) Make sure all electrical ground straps are properly connected.
11) Never, Never us an impact gun to install torque converter bolts. Driving
a bolt into the converter cover will create a dimple on the lockup apply surface.
Lockup clutch failure will occur when the lockup piston applies against and
uneven surace. Grinding off on thread length from all lockup converter bolts
is recommended to avert this type of failure.
Transmissions Automatics 
automatic
transmission overhaul kits, parts including steels, kits, solenoids, filters, solenoids.
This wide selection of parts are used in the GM TH400 automatic transmission in GM
model years 1965 to 1990 Chevy light duty trucks and passenger cars starting in 1965..
In addition to these kits we also supply torque converters, fluids, problem prevention
kits and in most cases we can supply good take out hard parts and save you some money.
