E Rod and a 4L65E - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMJimmy · 04-10-2015, 07:58 PM

I'm planning on putting a connect and cruise setup (LS3 with a 4L65e) in my 70 shortbox stepside and I'm looking for some suggestions for the right rear gear ratio to use. The truck with 29.6" tires has a 3.08 in it now which will rev at 1704 rpm at 70 mph. 3.73's will rev at 2085 so I'm thinking maybe 3.55's may be better at 1964 rpm. Is anybody using the 4L65 or anything with a .70 (.696) OD and similar rear gear ratio that can tell me how they like it?
Suggestions appreciated.
Jim

04-10-2015, 07:58 PM	#1
GMJimmy Registered User Join Date: May 2004 Location: Ontario Canada Posts: 164	E Rod and a 4L65E I'm planning on putting a connect and cruise setup (LS3 with a 4L65e) in my 70 shortbox stepside and I'm looking for some suggestions for the right rear gear ratio to use. The truck with 29.6" tires has a 3.08 in it now which will rev at 1704 rpm at 70 mph. 3.73's will rev at 2085 so I'm thinking maybe 3.55's may be better at 1964 rpm. Is anybody using the 4L65 or anything with a .70 (.696) OD and similar rear gear ratio that can tell me how they like it? Suggestions appreciated. Jim



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