Topic: 37's?

[gcracker25]

anyone running 37's with the 4banger? If so what is your setup? meaning axles, gears, engine etc...I wana keep the 4banger but i want to run 37's and am curious about how to go about it.

[FourbangerYJ]

I ran them for a couple of years. I would have stayed with them but the tire I wanted KM2 is not avail in a 15 inch wheel, so I stepped down to 35's.

D44's with 5.38's. It did OK. It could of used a bit lower ratio. AX-5 tranny. Motor has a 62MM TB, 1 inch TB spacer, one of Sharps AFP set to 43 PSI. and the PD ignition kit.

Check the vendors area for the TB (Bounty Hunter) and for Sharps FPR if you have a YJ.

[aw12345]

Seems wiser to stay with 35's, anything bigger you end up building axles and it gets expensive fast. 4bangerYJ did well with his Dana44 in the front with 37's but I have also seen one of my friends blow CTM u joints and stub shafts at will on 37's.
Depends somewhat on how heavy your foot is and what you care to do with your Jeep. Dana 44 or a Ford 9" seems to hold up pretty well with that size tires or if you like going at it go for the bigger stuff like a Dana 60 or a 14bolt. 14 bolts are a big heavy son of a gun bit take quite a beating in stock form. It all depends what you care to do with your Jeep

[neale_rs]

If you have a TJ (low pinion dana 30 in front) it would be very risky to run 37s.  I would recommend sticking with 33s, that would be conservative, placing reliability first and capability second.  You could run 35s to place capability first, but would probably have ring and pinion problems sooner or later.  The rear d35 would need to upgraded also, even if you stick with 33s.   If you go with 37s, it would be best to upgrade both axles to dana 60s.  A common setup here locally is front and rear dana 44s and 35 inch tires ... it works very well and is not too expensive.

[aw12345]

High pinion Dana 30 seems to work very well for 35's the only drawback is no gear ratio deeper than 4.88 available. It is about the cheapest upgrade you can do to the front of a Jeep TJ the low pinion housing on those are prone to flexing, IE the diff housing opens up when locked and being worked hard used to give my front ARB a fit, a junkyard front axle out of a XJ and a parts swap out of my original front axle ended that issue

[Bounty Hunter]

I run 36" TSL's with 5.38 gears in d44 axles, works pretty well but could stand to be a little lower.

[gcracker25]

i was going to run D44 in front and D60 in rear i am just trying to figure out what gears to use mostly.

[FourbangerYJ]

i was going to run D44 in front and D60 in rear i am just trying to figure out what gears to use mostly.

5.38 minimum, 5.89 would be better.

[aw12345]

5.38 is ok, but a higher number is better, for my combo HP60 in front and 14 bolt in rear I was limited to a 5.38 ratio, which with a 5:1 transfercase works very well for wheelin. Street use it needs help but then it has 39's on it and is pretty much intended for trail abuse only

[sharpxmen]

that's way too much flex 

[gcracker25]

hmmm im still in a pickle between 37's and 35's still haha

[aw12345]

35's are a cheaper deal since you can run those reliably with a somewhat stock setup that bolts right under the Jeep. The bigger axles get expensive really quick even if you do all the work yourself

[FourbangerYJ]

hmmm im still in a pickle between 37's and 35's still haha

The D44 front would need chromo shafts and upgraded joints to live a long happy life. IMO. Took me 2 years to gather the parts to do the front end. But I did not cut any corners or go the cheap route.

[chrisfranklin]

Nice build, Art.  With that setup, you could drive one side over a Ferrari and not even notice 

[gcracker25]

ya i might just go with a nice 4inch long arm with 35's hopefully that will still do the job at the rubicon haha