Gearing for 37's?

LongrangeLauber · March 20, 2013

Hey all, was just wondering what yall are running gear wise if you are rolling big ol' meaty 37's? I have 35's now, but now that my body lift is installed I can tuck 37's so I plan on getting some when these are all gone. Anyways, was just curious what gears yall have, such as 4.10's, 4.56's, and 4.88's? Which do you think is the best for 37's on a 4L60E tranny (final drive is 0.70)? I do mostly backroad driving during the week and about once a month make a trip down to VB to visit my buddy, so was wondering which would give me the best balance between city/ highway MPG's? I would prefer that it doesn't downshift as much while towing a trailer or on the highway to maintain speed (current gears are 3.73), but like I said need the best balance. Ive used an estimated RPM calculator, but I want to hear from actual people what yall recommend. Thanks yall...

Mckenzie · March 20, 2013

Can we get a pic of your truck? For 37's i would go with the 4.56's but some might argue for the 4.88s

LongrangeLauber · March 20, 2013

I'll try and post one up tomorrow. I've tried before to set as my signature pic, but couldn't figure it out

blackout07 · March 20, 2013

I have 4.88s with 37s. 4.56 are more in line with 35s when using the charts. The truck never downshifted with 35s but it does occasionally with 37s. IMO you could go with 5.13 if towing.

LongrangeLauber · March 20, 2013

There ya go, finally figured it out...

wilsonz71 · March 21, 2013

Shittttttty. I was hoping my 4:10s would be alright for 37s. Guess it's 35s..

LongrangeLauber · March 22, 2013

Shittttttty. I was hoping my 4:10s would be alright for 37s. Guess it's 35s..

Well I still have 3.73's on 35's as of right now and I get terrible gas mileage around town. Just filled up and averaged it out. 12.5 MPG, now that's shitty

Does anyone know about how many MPG's around town I would gain? That's where I do most of my driving anyways. I was thinking of going 4.56's that way my exhaust is not so overwhelming at highway speeds

blackout07 · March 22, 2013

If you're truely getting 12.5 that is far from terrible on a lifted truck. If I drive conservatively I get that with my setup.

LongrangeLauber · March 22, 2013

Well that's good to know. If I regear then what should I expect for mpg around town?

Prokopchuk_9 · March 22, 2013

Mine works just fine with 3:73's and 35's

LongrangeLauber · March 22, 2013

Mine works just fine with 3:73's and 35's

Im guessing since your twin turbo'd your probably pushing well over 1200 pounds of torque? If so, that's awesome haha

Mckenzie · March 22, 2013

Truck looks good man!! And 12.5 isnt bad at all! For 35s and 9 inches of lift!

LongrangeLauber · March 22, 2013

I thought it was pretty bad until I posted it on here, and now everyone is saying 12.5 around town is good haha... Personally, I think I can get a little bit better. Right now, I can basically watch my needle drop.

I know when I was leveled with 33's, I was getting 14.5-15 around town with my intake, programmer, and exhaust setup (if that last part even helps...)

Prokopchuk_9 · March 23, 2013

Im guessing since your twin turbo'd your probably pushing well over 1200 pounds of torque? If so, that's awesome haha

round that ya...

man 37's run 4:56, 35's run 4:10's...still not stock but its good enough

LongrangeLauber · March 23, 2013

I was thinkn either 4.88's or 56's... I crawled under my truck and noticed a leak from the front differential at one of the seals so the time to re gear might be sooner than later...