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Uranus 12-20-2011 09:18 PM

Looking to regear
I have a 97 4.0 auto with 2" lift on 31's with 3.07 gears. When I tow my small camping trailer and family up the grapevine (Steep freeway incline in CA) I can't even keep up with the big rigs. So I was thinking about re gearing or finding another axle with a better ratio since I have a open d35. I also average 14 mpg. I have only wheeled a few times and plan to do more in the future but don't plan on getting bigger that 32" tires.

So should I just re-gear the d35 and d30, or look for a axle swap and match the front to match it? or find a matching front later on and not put her in to 4wd for a while.



MarkNog 12-20-2011 11:15 PM

Depending on what you can get cheaper, I would go with that because its not like you need to upgrade you axles for 31s, and if you were to go bigger in the future you would need to regear again so it wouldn't do much good to go with a heavier duty axle because you would be in this same situation when you went to change tire sizes.

Uranus 12-20-2011 11:26 PM

I would be looking for a used axle with a higher gear ratio. Another question would be what gears to look for. would 4.11 or 3.73 or higher?

ou812 12-20-2011 11:41 PM

I think with towing involved 4:56 would be the way to go

regear the rear means changing the diff carrier,ring and pinion plus new bearings,seals and shims


finding a used d35 with atlease 4:11's

probly cheaper to find a used better geared axle but as always with used....its used.You never know how it was treated or how long it will last.

I'd regear if it was affordable

also consider the price to have a shop to regear it,labor cost alot.

carrier is about $70
r&p about $200-$300 but you get the exact ratio you want
master re gear set is $110,all bearings and shims

then with either choice you make you still need to regear the front to match and if you dont match the front the same time as the rear you gotta pay more labor.
its cheaper to bring just the axle to the shop,not the whole Jeep

Uranus 12-20-2011 11:56 PM

I would try to find a d44 or a 8.8 and save up to have the shop install it.

Wheel2Work 12-21-2011 04:50 PM

Since you don't plan on going over 32" tires, I would stay with the 3.73 gears... You will end up with RPM's being way too high on daily drives if you go bigger with the 32RH transmission.

WickedVision 12-21-2011 10:50 PM

I used to tow a camping trailer with 3.07s and I dreaded hills on the highway. I installed 4.11s with truetracs in my stock axles. This seams to be the perfect ratio for me with 33s. If I geared any lower the rpms would be to high on the highway

Uranus 12-28-2011 11:08 PM

Just emailed a guy about a 8.8 with 3.73 and a posi for $250 but I still can't decide if I should got to 3.73 or 4.11

WickedVision 12-29-2011 12:16 AM

$250 for an 8.8 with 3.73 and posi is a steal. If you can get it, go for it. 3.73s should be perfect with the 31s

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