1972 GMC C2500



May, 5, 2010 AT 10:54 PM

Transmission problem
1972 GMC C2500 V8 Two Wheel Drive Manual 67,000 miles

I would like to replace the granny gear tranny with something that has a better ratio such as a 5 speed or 4 speed. What other transmissions would work from other truck/cars that would work better. Right now I have about almost 400 horses under the hood 350 with a I think muncie 4 speed with low gear. I have 411 gears in rear and am changing to 14 bolt axle with 342 gears. Would it be wise to keep the tranny I got now with the 14 bolt or upgrade to something more geared for the high way and not so much for towing. I was once told a 5 speed tranny from a chevy truck might fit but need a definite answer.

1 Answer



May, 21, 2010 AT 5:48 PM

You would be able to go to a 4 speed saginaw with not much problem. A 5 speed may fit, but on both of the transmissions you may have to change your clutch to match. As the input shafts may be different. I know the 5 speed is for sure.

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