In your sig you have 3500 axles, correct? That would be a dana 60 and dana 80. I have 4.10s in m 95 with 37s and a 5spd. Final drive on the 5spd is lower than the auto, so comparable gearing for the auto would be 4.56s. I like my gears as they are, 2000rpm at 65, I don't drive much faster than that. I have about 5000 miles on my gears, and they're fine. I am running yukon gears in the rear and motives up front. No complaints. I did have them professionally installed to get the setup right the first time, labor was $400 per axle. I had a 99 2500 with 37s, auto and 4.56s and the gearing was slightly lower than mine IIRC. Make sure you get the correct gears for the 3.55 and lower carrier. The ring gear is different for the 3.55 and 4.10 carriers. Yukon makes the gears you'll need at least in 4.10, not sure about 4.56. If you could find some 4.30s that would be perfect. Hope this helps

 

4:10 with 37" is about the same ratio as stock tires with 3:55. 38's I would go a 4:30 or even a 4:56. Anything higher than 4:10 on the stock carrier you'll have to go to a thick gear set or change the carrier and go to a regular set higher than 4:10's

 

Dont mean to thread jack but the 92 im rebuilding im plannin on runnin 35's would I be good leaving the 4:10's in the axles??? I'll have a 6 speed so would i be able to run 65mph around 18 or 1900 rpms??? Been meanin to ask this in a thread anyways


Sent from my iPhone using AutoGuide.com Free App

 

There's a couple of gear calculator's floating around on a few threads just do a search and you'll find them. You'll be able to change gear ratio, tire size, final drive and even give you spedo gear. Here's one from pitbull :: PIT BULL TIRES :: Axle Ratio/Tire Size Calulator 1.1

 

Also consider a 38" tire doesn't mesure 38". They differ from maker to maker. My 37" procomp X A/T actually mesure 36.6".

 

I have a Question too... if I have stock gears, with a tuner and 6" lift and am getting 37's soon. Will I absolutely need different gears or can I get away with stock ones?

Sent from my DROID RAZR using AutoGuide.Com Free App

 

You can get away with stock gears, but I wouldn't tow heavy with it and it'll hurt your fuel milage, well worse than if you had proper gearing. Transmission might try to hunt for gears if you got an auto. I see lots of guys around here that drive superdutys and rams with big tires with stock gears. Ive heard a few complain about not having any power down low. Not sure about speedo calibration, I think your tuner might be able to change that for ya but I don't have any experiance with the third gens.