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JBUSAF
07-23-2007, 08:48 PM
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
07-23-2007, 09:03 PM
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
07-23-2007, 09:31 PM
Got my numbers in overdrive.
JB
Havasu Hangin'
07-24-2007, 04:57 AM
If you have stock tires (30"?) I'd say you have 4.10's.
http://www.4lo.com/calc/gearratio.htm
Kindsvater Flat
07-24-2007, 05:44 AM
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
07-24-2007, 12:05 PM
Gt4= 3.73 Gt5= 4.10 Gu6= 3.42 G80= Locking Diff
JBUSAF
07-24-2007, 02:59 PM
I was hoping for 3.73, thanks for the codes!
JB
Moneypitt
07-24-2007, 04:38 PM
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
07-24-2007, 06:57 PM
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
07-24-2007, 07:16 PM
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
Paul128a
07-25-2007, 10:07 PM
245/75-16
245mm width, height is 75% of width, rim size 16 inches
245 x 75%= 183.75mm height from rim to thread
183.75 x 2 = 367.5mm
367.5mm / 25.4 = 14.4685 inches
14.4685 + 16 inches rim = 30.4685 inches total height (diameter)
I would say that actual size would roughly be 30 inches. Hope that helps.