The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Looking For Info on 3-Speed Trans Ratios

C10 - C90 Bill · 01-07-2007, 01:48 PM

Cougar, You just about read my mind. I was about to say that myself. I am pretty much used to granny gear 4-Speed and 5-Speed trucks and 10-Speed Road Ranger transmissions.

But,

The half ton pick up I drove daily just before this one was a '66 C-10 which I believe also has a 3.73 rear. Starting off in that truck seemed more normal to me. When I jumped over to the '72 C-10, I could tell a difference. What I need to do next is find out if the '66 trans has a lower first. As you probably know, they are the old style Muncie non-synchro first trannys. Typical of those not holding up real good, I went thru 3 of those trans in the 9 years I had that truck on the road. The last one I put in, was out of a '61 Bel-Air car with a 235 6 cylinder. All 3 trans I used all seem to have the same ratios.

What I need to do next is to find out what those old 3-Speeds had for a first gear ratio and that could possibly answer my question.

01-07-2007, 01:48 PM	#11
C10 - C90 Bill Registered User Join Date: Nov 2001 Location: Moneta, VA USA Posts: 3,063	Re: Looking For Info on 3-Speed Trans Ratios Cougar, You just about read my mind. I was about to say that myself. I am pretty much used to granny gear 4-Speed and 5-Speed trucks and 10-Speed Road Ranger transmissions. But, The half ton pick up I drove daily just before this one was a '66 C-10 which I believe also has a 3.73 rear. Starting off in that truck seemed more normal to me. When I jumped over to the '72 C-10, I could tell a difference. What I need to do next is find out if the '66 trans has a lower first. As you probably know, they are the old style Muncie non-synchro first trannys. Typical of those not holding up real good, I went thru 3 of those trans in the 9 years I had that truck on the road. The last one I put in, was out of a '61 Bel-Air car with a 235 6 cylinder. All 3 trans I used all seem to have the same ratios. What I need to do next is to find out what those old 3-Speeds had for a first gear ratio and that could possibly answer my question.