155998496 GM Truck
General Motors Part Number 15998496 Clutch Housing
GM Casting #15998496
Pictures, descriptions and measurements are from
a new old stock 1996 and up NV4500 bellhousing.
There are three 1 3/8" holes in the bottom of this
There are two large vent holes and 1 small slotted
hole in the upper half of this clutch cover.
Transmission Mount Holes
The four transmission to housing holes are metric
Center hole is approximately 5 9/16"
No Fork Stud
There is no provision for a clutch fork pivot. This
means this housing can only be used with a hydraulic
throw out bearing.
The casting number is located on the inside of this
Inspection Plate Bolt Holes
The 4 holes that retain the inspection plate are
un-threaded on this N.O.S. clutch cover.
This bell has 6 housing to engine holes.
The face to face (Depth) of this housing is the
same as all corporate bellhousings that I've seen.
Approximately 6 3/8".
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!