So I have a 6 spd with 35's right now. I do a lot of highway driving, so 4:88's seem to be the best match for me. I was wondering how 4:88's would be if i where to ever think of getting 37's in the future? Anyone run that set up?

I know a lot of people are going to say 5:13 but I do a lot more highway then i do off road and its not practical for me with the 35's.

Just a question, I'm also just as happy sticking with 35's

 

you'll definitely feel power loss running 4.88's and 37's but who knows, you might be okay with it. hell, i'm running 37's on factory 3.73's right now and honestly, it's not as bad as i thought i would be.

 

4.88s will almost carry you all the way through 40s with a manual transmission. The 4.88s are slightly steep for 35s, but nearly everyone who has traveled this route has enjoyed the performance.

 

I agree with JPop. If you're doing a lot of highway driving 4.88s would be the right choice for 37s in my opinion. I have 35s and 4.88s. I love them, but if I was on the highway constantly I think I might have opted for 4.56s.

 

Thank you!

 

I'm running 4.88's on 35's and a manual trans.

1st gear is useless except on the trail. On the highway you can do about 75mph at about 3050-3100 rpm. don't think i would push it much more than that as the little squirl sounds like he is about to run his legs off. if i had to do it again i would have done 4.56 to get a bit more on the highway as i spend 90% of the time getting to the 10% on the trail.

if your doing 37's in the future you should be good, and i think you will be happy with 4.88's and 37's.

just my 2-cents

 

Thank you in advance.... This was my exact question!

 

Sounds like your tires are measuring out close to 33" or your Speedo is off.

 

I had my 4.88's and 37's installed at the same time. I went from the stock Rubicon BFG's and 4.10's. No performance tunes on the motor, no CAI's, no aftermarket cat- back exhaust.

To me acceleration feels stock. I shift at the same places as before. I can haul the Jeep up to 90+ mph if I wanted to. 70 MPH is around 2550-2600 rpm. Milage dropped from 15.5 to 13.8 as calculated by the travel computer. I have MT/R - Kevlar's for tires.

The only potential downside I can see would be if you're going to be doing towing near the max rating in the mountains. 4.88's may let you down without some engine performance mods. On the straight level and moderate hills at highway speeds the Jeep will hold it's own.

Offroad I have the 4:1 of the Rubicon transfer case so I feel pretty confident there in 4 lo.

Hope this helps.

 

Yeah, KM2's measure out at 33.75. the speedo is right on the money.