Hi! I have a 6.2 Diesel Silverado that, according to a website I found, has rear axle ratio of 4.10, which I had assumed all along. It has a
700R4, and seems to 100rpm/3mph-- IOW, 1500= 45mph, 2000=60. I was wanting to change the rear end to somewhere in the 3.50 range, but then saw a website on transmissions that gave the OD ratio of a 700 as about- I am afraid that 3.50 +/- would be lugging the engine in OD. FWIW, truck is a 3/4 ton extended cab and has a liftgate on it.I do not plan to tow anything heavy-- maybe a car on the tow dolly, or a trailer with about 1000 lb on it. I can't see going to the expense of changing the rear end to just the next higher ratio from 4.10. Any comments and advice will be greatly appreciated. Thanks Larry