General Motors Casting Number 3815891 Clutch Housing
The General Motors part #3832808 (Casting #381581)
clutch housing was used on 1962-67 Chevrolet
heavy duty trucks (Ser. 40-60). But can be used as
a replacement for the 62-72 truck housings, when
installing a car transmission (4 5/8" center hole).
The "vee"shape of the transmission mounting
flange is one way of distinguishing a truck housing
from a car housing.
Hole is approximately 3 1/2" x 1 7/8". And
accepts the GM part #3765360 fork boot.
(Our part #159)
The casting number is under the transmission
mounting flange, when the transmission is installed.
The date code is cast onto the the passenger side
front face, and is visible when installed.
The starter is mounted to the housing, using the
two 3/8"-16 taped and one untapped hole.
This housing has provisions for the typical
bellhousing positioned truck motor mounts.
The transmission is mounted to this housing via
the two 1/2"-13 tapped and two untapped
(use bolt and nut) holes.
This is a second housing with different date.
Size: 168 tooth flywheel
Engine Bolt Pattern: Chevy
Transmission Bolt Pattern: GM
Transmission to Bellhousing Threads: 1/2"-13
Center Hole Size: 4 5/8"
Ballstud Threads: 13/16"-16
Inspection Plate Bolt Threads: 1/4"-20
Face to Face Measurement: 6 5/16"
Starter Mounted: Yes
Starter Nose: Round 3 Bolt
Note: all measurements are approximate.
0.683 HOUSING, Clutch (L.H. fork opening) (Ident No. 3815891)
62-64 Ser. 50-60 (6 cyl.) (exc. LCF, Tilt)
63-64 Ser. 50 (283) (exc. LCF)
65-66 Ser. 50 (283) (exc. LCF, Tilt, H.D. 4-Spd.)
65-66 Ser. 50-60 (6 cyl.) (exc. D-D, LCF, Tilt, H.D. 4-Spd., P.T.)
67 Ser 40 (6 cyl.) (exc. D-D, Tilt, H.D. 4-Spd.)
67 Ser 50-60 (6 cyl.) (exc. D-D, Tilt, Diesel, H.D. 4-Spd.)
67 Ser. 40 (283) (exc. Tilt, SBC)
Most parts that I describe and picture, have identification on or with them, others I can identify from other sources and deduction (educated guess).
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Applications are for replacement parts that were available at the time of parts book printing, and when possible model specific assembly manuals.
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!
Out of Stock