Sinking Creek 4WD Association

If you put synthetic gear oil in you diff I will drain it out at night.

It's a Jeep, with a Dana 35 (I think) not an M3, just buy the cheapest stuff they have. 80w-90 is usually cheaper at Advance, buy that. I promise it will work just peachy.

Is is indeed a D35 rear and a D30 up front.

BadAssEddie wrote:If you put synthetic gear oil in you diff I will drain it out at night.

It's a Jeep, with a Dana 35 (I think) not an M3, just buy the cheapest stuff they have. 80w-90 is usually cheaper at Advance, buy that. I promise it will work just peachy.

reading this shit makes me chuckle. But agreed its a c-clip turd of an axle dont waste your money on synthetic stuff when the cheap stuff will do the exact same thing. you will never know the difference. *Now if if had 3.07 gears then you would have to put synthetic in it because 3.07 are the shit and you want to make them last and operate smooth for peak horsepower

Matt612 wrote:*Now if if had 3.07 gears then you would have to put synthetic in it because 3.07 are the shit and you want to make them last and operate smooth for peak horsepower

LOL QFT

Yes mechanics can often be lazy, however its not SUPER unheard of to have a diff cover weep a little bit and make the diff look damp. I'll be happy to help you out with resealing them at some point/you're welcome to use my tools.

Running standard 80w-90 will be just fine for the jeep, but if you want to run a 140 weight go for it. Valvoline 140 is like 6-7 bucks a quart, essentially the same price as the other Valvoline weights. Its more expensive than the AA brand, but not by that much. You definitely don't need a synthetic, a conventional will do you just fine with it.

In a non super high performance wheeling rig its a little silly to run synthetic since you will end up changing the fluid before the service interval due to water, leaking cover, installing locker, broken parts etc. On a street only vehicle (or if I weren't cheap my truck) synthetic has its place because of its ridiculously long service intervals (or just never change it again). Not that you can't do that with conventional, but if you're playing it by the book..

I've also heard you have to run limited slip additive with 3.07's even with an open diff. This is due to the massive amount of traction the gears give you, acting like a LS themselves. Apparently, if you have 3.07's with a LS or locker, you run pure additive and pray that your locker can handle the badassness that is 3.07's, it usually can't though.

willhf1011 wrote:I've also heard you have to run limited slip additive with 3.07's even with an open diff. This is due to the massive amount of traction the gears give you, acting like a LS themselves. Apparently, if you have 3.07's with a LS or locker, you run pure additive and pray that your locker can handle the badassness that is 3.07's, it usually can't though.

Very well said. Another testament from our pres himself to how badass 3.07 gears are

Matt612 wrote:

willhf1011 wrote:I've also heard you have to run limited slip additive with 3.07's even with an open diff. This is due to the massive amount of traction the gears give you, acting like a LS themselves. Apparently, if you have 3.07's with a LS or locker, you run pure additive and pray that your locker can handle the badassness that is 3.07's, it usually can't though.

Very well said. Another testament from our pres himself to how badass 3.07 gears are

oh i just remembered mine were 3.08s so thats why they blew up...

jstables wrote:
oh i just remembered mine were 3.08s so thats why they blew up...

its that magic number boy.

Looks like I am safe then. I have the 3.73's hahaha

willhf1011 wrote:I've also heard you have to run limited slip additive with 3.07's even with an open diff. This is due to the massive amount of traction the gears give you, acting like a LS themselves. Apparently, if you have 3.07's with a LS or locker, you run pure additive and pray that your locker can handle the badassness that is 3.07's, it usually can't though.

All Cherokees with a 5 speed came with 3.07's. Chrysler implores owners of these special editions to actually run wheel bearing grease in the diff housing to keep the fusion like temperatures down. "That's BadAss"