Drive Line Gurus

[RedRooster]

I am new to 4x4, and I have this jeeper telling me that 5.13 gears with my set up will not sling the mud off my tires fast enough or hard enough, to give me traction.

Hitchcock is
305ci
39.5 irok
700r4 NP208
5.13 in the 10bolt front
3.73 in the 12bolt rear

I want to be effective as possible, right? - and with as little wasted as possible, so my plan is to match the front with 5.13 in the rear.

Goop slinging mud racer really isn't what im am going for, and I could not really tell if this jeeper guy was trying to describe a specialized mud/race setup. Mud racing is not my thing, I like to roll through things technically, vs. balls out mud running or something.

-I am in florida.
-There is a lot of mud everywhere. Mostly its just water on top of sand.
-Palm crushing works fine.
-stump jumping seems to work ok the few times its come up NFI
-Mud ruts give a little trouble (of course/always/naturally)
-sugar sand NFI right now
-water on sand seems to do fine, except for the occasional top center.

But yeh, no rocks around here, mainly woods ridding, and water fording.

Really though the only thing i want is to get the driveline running so it is not so self destructive, and stop wussy footin around with missmatched gears in 4x4. Im treating her real tender at this point, not always going where I want to go.


Gentlemen Let me know what yall think.

 

[Hogback Fabrication]

Go with the 5.13's

 

[4X4HIGH]

First off, DO NOT use 4wd with mismatched gears or you'll have a t-case in pieces in short order. Now installing 5.13's in the rear is what i would do especially with 39.5" tires.

 

[bigblock72]

With 39s and a 305 I would consider 5.13s a minimum. There is no way you'll have enough grunt to spin 39s with 3.73s.

 

[Blue85]

39.5s with 5.13 is only slightly lower than the stock combo of 3.73 with 29" tires, so it's certainly acceptable. That lets you get 100mph in 3rd gear @4500 rpm, so I don't know what more wheel speed you would need...

The Jeeper is probaby just used to much smaller tires, so a number like 5.13 seems huge.

Whatever you do, don't regear for 3.73 at both ends.

 

[muddermilitia]

Most guys that run two different gear ratios, run the higher gear (numerically lower) in the front axle so that the fronts spin faster to keep the front end up and above the mud. But that is for strictly mud.

I would think that if all you do is mud, you are going to need more than a 305

 

[gone huntin]

5.13's will be fine, but that 12 bolt won't with those 39.5's. You need to upgrade to a 14bff.