Chevy axle ratio???

[JBUSAF]

OK, I know it V-drive forum, but I'll pull a V-drive with it!
Got a 2001 3/4 ton Suburban, it turns 2400 RPM at 70 MPH, does it look like I have the 3.73 or 4.10 gears? If the speed and rpms can't establish, what code am I looking for in the glove box?
Thanks
JB

[Moneypitt]

OK, I know it V-drive forum, but I'll pull a V-drive with it!
Got a 2001 3/4 ton Suburban, it turns 2400 RPM at 70 MPH, does it look like I have the 3.73 or 4.10 gears? If the speed and rpms can't establish, what code am I looking for in the glove box?
Thanks
JB
There IS a tag on the housing somewhere. Usually under a bolt. Are your RPM/speed numbers in or out of overdrive?????? An old rule of thumb was a 4.11:1 gear would be about 1/2 RPMs to speed. Example, 3K would be about 60. This isn't exact because of things like tire size, (height), but approximate. If your numbers were in drive, not overdrive, I would guess the 373 gear. But look around on the differential, I'll bet there is a tag...........There is also a formula to figure it to the knats ass with the proper data..........MP

[JBUSAF]

Got my numbers in overdrive.
JB

[Havasu Hangin']

If you have stock tires (30"?) I'd say you have 4.10's.
http://www.4lo.com/calc/gearratio.htm

[Kindsvater Flat]

Your code is in the door. My 04 gmc has 4.10 gears and at 70 I'm closer to 3000 rpm. More than likely you have the 3.73s

[fleetimus]

Gt4= 3.73 Gt5= 4.10 Gu6= 3.42 G80= Locking Diff

[JBUSAF]

I was hoping for 3.73, thanks for the codes!
JB

[Moneypitt]

I was hoping for 3.73, thanks for the codes!
JB
I think 2400 with a 30% OD would be a little faster than that with the 3.73s.....MP

[tbanzer]

Your code is in the door. My 04 gmc has 4.10 gears and at 70 I'm closer to 3000 rpm. More than likely you have the 3.73s
Cant say on a 01 but the option codes on GM trucks were on a laminated sticker inside the glove box at one time.

[JBUSAF]

Thanks guys, code says Gt5 and G80. I will drive it in 3rd gear tommorow, should that be 1/1 from the tranny? I think the 245/75 16s are almost 31" high.
Thanks
JB