Hi folks,

I have a mint '58 GMC 2.5 ton with a seized 270 and a Muncie SM420. I am negotiating long distance on a low mileage 292 from a '66 Chev 5 ton (attached to a NPC96051 5-speed).

Will the 292 just 'bolt up' ? Are the external dimensions such as block length, motor mounts, bolt holes to bellhousing, etc. the same ?
Anything else I need to know ?

As a secondary question, would there be any advantage (or ease or feasability) in swapping to the NP transmission - like overdrive ? Or, would this tranny just be too big ? My truck has a 'flat floor'.

Any help is greatly appreciated.

Royzell in Shawnigan Lake B.C.
51 GMC COE (on '76 GMC drivetrain)
58 GMC 2.5 ton
83 GMC campervan
81 Mercedes turbodiesel wagon - kid and dog hauler
and 2 1986 GM parts vehicles


Royzell