#3925505
Chevrolet Truck Bellhousing Casting Number 3925505
The Chevrolet "505" is a cast iron 168 tooth
flywheel Bellhousing. It has a 5" center hole
which makes it compatible with truck transmissions
made for GM vehicles.
Front view
Part# and Date Code
The part # is cast into the Trans mounting flange,
and can't be seen with trans bolted up. The date
code is alpha numeric like those cast into engine
blocks.
This example reads A 5 2
A= Jan.
5= fifth day
2= Year
Inside view
This view shows the starter and trans mounting holes.
Starter mount consists of two 3/8"-16 tapped holes
and one 3/8" clearance hole. Trans mount utilizes
two 1/2"-12 tapped holes for the upper trans ears
and two clearance holes for the lowers.
Top view
Bottom view
Notice the slim flange for inspection cover mating
compared to the car bells.
--------------------------------------------------------------------------------------------------------------------
The picture below are for comparing Car to truck
bells, at first glance they are similar. But the
differences are major. Not the least of which is the
transmission mounting hole and motor mount provisions.
Motor mount comparison
The Chevrolet "505" is a cast iron 168 tooth
flywheel Bellhousing. It has a 5" center hole
which makes it compatible with truck transmissions
made for GM vehicles.
Front view
Part# and Date Code
The part # is cast into the Trans mounting flange,
and can't be seen with trans bolted up. The date
code is alpha numeric like those cast into engine
blocks.
This example reads A 5 2
A= Jan.
5= fifth day
2= Year
Inside view
This view shows the starter and trans mounting holes.
Starter mount consists of two 3/8"-16 tapped holes
and one 3/8" clearance hole. Trans mount utilizes
two 1/2"-12 tapped holes for the upper trans ears
and two clearance holes for the lowers.
Top view
Bottom view
Notice the slim flange for inspection cover mating
compared to the car bells.
--------------------------------------------------------------------------------------------------------------------
The picture below are for comparing Car to truck
bells, at first glance they are similar. But the
differences are major. Not the least of which is the
transmission mounting hole and motor mount provisions.
Motor mount comparison
The truck housing is on the left.
Applications
3925507 (Ident. #3925505)
0.683 HOUSING ASSY., Clutch
68-72 Ser. 10 thru 30 (292) (Chevy Truck Parts Book)
68-72 Ser. 10 thru 30, Blazer (250, 307, 327) (Chevy Truck Parts Book)
69-72 Ser. 10 thru 30, Blazer (350) (Chevy Truck Parts Book)
68-69 Ser. 10 thru 30 (194, 216, 235, 261) (Chevy Truck Parts Book)
68-69 Ser. 10 thru 30 (exc. 3-53) (Chevy Truck Parts Book)
73 P-3 w/11,000 lb. axle (307) (Chevy Truck Parts Book)
73-75 P-3 (4-Spd. w/Prop. Shaft Park Brk.)(292) (Chevy Truck Parts Book)
History:
3925507 REP 3854441 05-69
Quick Reference
Engine Bolt Pattern: Chevy
Transmission Bolt Pattern: GM
Center Hole Size:
Ballstud Threads
Face to Face Measurement
Starter Mounted
Starter Nose
Disclaimer:
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 won’t be sorry).
This is a fun and interesting part of the hobby!
