Clutch Release Bearing
Throwout Bearings
General Motors Parts Group 0.799
This parts group has all the part numbers for the various clutch release (throw out) bearings. I started to attempt, to determine the differences between these part numbers, then I realized that unless you have a new old stock flywheel, pressure plate and clutch disc, these numbers are useless.
The main reason for these different part numbers was to achieve the correct clutch fork angle for all the different clutch kits installed in GM cars and trucks.
The modern clutch kits that replaced these old parts, are of different thicknesses and vary from manufacturer to manufacturer.
The best way to get to a correct fork angle is by trial and error by using longer or shorter clutch fork ball studs, or by using taller or shorter throw our bearings, or a combination of both.
That is why I carry adjustable throw out bearings and adjustable clutch fork ball studs.
900018
Chevy
1 9/32" long
ND CT24K
ND CT24E
ND CT-24F
diaphram clutch
(coil spring clutch
inc. collar)
907052
Corvair
1-21/64 long
CT244
ND CT24H
907397
Pontiac
907403
Chevy
1 1/4" long
907538
Chevy
1.220 long
CT24K
ND CT 24K
907575
Chevy
to 909422 per 79 supersessions
907963
Buick
Chevy
1 7/32" O.L.
ND-HCT-24K
907588
Buick
Chevy
Oldsmobile(V6)
907826
Chevy Truck
superseded by 908120
907963
Chevy
1 7/32" long (1.220 long)
ND-HTC-24K
Type CT-245/sup 907538
908092
1 7/8" long "round face" bearing.
Stamped CT22
Chevy (6cyl.)(283)(307)(327)
(350)(396)(400)(454)
Chevy Truck
Pontiac
Oldsmobile
908093
Chevy
1 7/32" long
ND-HCT-24K
stamped CT24K
Pontiac
908120
Chevy Truck
1 1/4" long
908244
Chevy
Chevy Truck
1 1/4" long
CT24E
CT-24K
Stamped CT24K
note : use with 11" clutch pressure plate
Oldsmobile
909422
Chevy
1 7/8" long
ND CT22
Buick
1367058
Buick
History
3819927 to 907826 rep 05-72
900018 to 907826 per 79 supressions book
907826 (truck) to 908120 10/73
908120 (truck) to 908244
909422 to 908092 4/73
3788655 to 907963 08-71
907963 to 907538 5-69
907963 to 908093 4/73, 9/79
907963 Replaced 907588 05-69
907963 Replaced 3788655 08-71
under 0.859 COVER, Clutch Pressure
NOTE : 2 When using 3973142 in place of 3788655 discard old clutch rel. brg 1 7/8" overall lgth.,
purchase and install 907963 1 7/32" overall lgth.
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Application charts are for replacement parts that were available at the time of parts book printing.
My observations come from the parts I have in my collection or other reliable sources your parts may differ.
If Factory correctness is your goal, do more research, join car clubs,
forums and buy an assembly manual if one is available for your Project Car (you wont be sorry).
This is a fun and interesting part of the hobby!
