Another gearing question.

[muzzfactor]

I've got a 1984 GMC shortbox with a 350 and 700r. I just installed a 4 inch lift and I'm running 35's on the stock 10bolts with 2.73's . This truck will mainly be used on the highway and I'd like to run around 75 and 80mph. I've done quite a bit of searching on this forum and I've pretty much decided to go with 4.56's but I just wanted to make sure that you guys agreed. Remember, mostly highway driving will be done. Any info would be greatly appreciated. Thanks.

 

[6.2Blazer]

If you like how the truck runs on the highway with the 2.73's and transmission in D (not in overdrive) then it will be pretty close to having 4.56's and running overdrive on the highway....it will be a little lower, about equivalent to 3.20 vs. 2.73 but that's fairly close.

 

[pauly383]

I love the rpm range of 35's and 4.56 in mine , very livable , and OD is useable again in town ( like the owners manual of the truck says to leave it in )

 

[xanthias]

http://www.4lo.com/calc/gearratio.htm