front diff oil?

CarNutCertifies · **Posted:** Mon Mar 19, 2007 11:58 pm

anyone know what weight gear oil is to be used in the front diff and is there an additive required? also how bout the T-case and rear? Need to change mine.

Jeepjeepster · **Posted:** Tue Mar 20, 2007 1:17 am

75w-140 SYN for front diff.

ATF+4 is good to use in the tcase.

Same as front for rear or 80w90.. I use 75-140SYN..

unixxx · **Posted:** Tue Mar 20, 2007 1:46 am

The differential lube specifications have changed multiple times since 2002, but you're probably safe using any of them. The 2005 specification for the front is 80W-90 dino lube. I'm probably going to use 75W-140 AMSOIL Severe Gear.

sleeve84028 · **Posted:** Tue Mar 20, 2007 7:38 am

Just got done doing the front and T-case last weekend: I used the 75-140 in the front and some MOPAR ATF+4 in the T-case just like it is supposed to be.

JJsTJ · **Posted:** Tue Mar 20, 2007 7:54 am

CarNutCertifies wrote:

anyone know what weight gear oil is to be used in the front diff and is there an additive required? also how bout the T-case and rear? Need to change mine.

75W-140 synthetic is specified for the front diff of an 02.

NO additive is needed for the front and only needed for the rear if you have a posi or Trac-Lock.

The rear of a 2002 specifies 75W-90 or 75W-140 if towing.

ATF+4 spec fluid for the transfer case & Auto transmission. Amsoils ATF is a Full Synthetic that surpasses ATF+4 specs.

For those with a manual trans, it requires a Synchromesh fluid.

CarNutCertifies · **Posted:** Tue Mar 20, 2007 12:14 pm

Thank you all how much do they require?

unixxx · **Posted:** Tue Mar 20, 2007 1:10 pm

Check out the table at the very bottom of this page:

http://www.fuzzymuzzle.com/Car/Gear_Ins ... r_8.25.htm

CarNutCertifies wrote:

Thank you all how much do they require?

JJsTJ · **Posted:** Tue Mar 20, 2007 1:25 pm

unixxx wrote:

Check out the table at the very bottom of this page:

http://www.fuzzymuzzle.com/Car/Gear_Ins ... r_8.25.htm

CarNutCertifies wrote:

Thank you all how much do they require?

Dang Michael, that is some good tech right there! Is there another link to that in our tech section? If not, would you mind adding a thread for that?

CarNutCertifies · **Posted:** Tue Mar 20, 2007 1:32 pm

what is the LSD additive? and can i buy that at my local parts store?

JJsTJ · **Posted:** Tue Mar 20, 2007 1:43 pm

CarNutCertifies wrote:

what is the LSD additive? and can i buy that at my local parts store?

http://www.amsoil.com/storefront/ada.aspx

Do you have a factory rear Posi, Trac-Lock?
Let me get you a quote on whatever you need. If you like the quote and you purchase, I will throw in the LS additive free. :wink:

JJsTJ · **Posted:** Tue Mar 20, 2007 1:44 pm

Oh and Yes, you should be able to find posi additive at any good parts store. They should be able to point you to it if you ask.

CarNutCertifies · **Posted:** Wed Mar 21, 2007 4:27 pm

I dont have posi i have a limited slip diff, i just saw that the tech article kept calling it LSD additive.

unixxx · **Posted:** Thu Mar 22, 2007 2:53 am

I just need to finish writing it first. :wink:

JJsKJ wrote:

Dang Michael, that is some good tech right there! Is there another link to that in our tech section? If not, would you mind adding a thread for that?

LSD = Limited Slip Differential. The Trac-Loc LSD was the only factory traction aiding device available in the Liberty. You can get the LSD additive at the dealership for sure, although probably marked up.

CarNutCertifies wrote:

I dont have posi i have a limited slip diff, i just saw that the tech article kept calling it LSD additive.

JJsTJ · **Posted:** Thu Mar 22, 2007 7:39 am

CarNutCertifies wrote:

I dont have posi i have a limited slip diff, i just saw that the tech article kept calling it LSD additive.

From Urban dictionary - Posi:
"In hot-rod groups, short for positrac. Positrac was the GM trade name for a differential gear which would lock under severe loading to ensure that both drive wheels were turning. Highly desired in drag racing. The positrac name is now mostly generic in usage, with many racers referring to every locking diff a "posi"."

I consider myself old enough to be "old school" and I just can't stop calling any limited slip diff a posi. I also refer to all lockers as Lockers regardless of brand name. Anyhow, The LSD/Posi addititve that I referred too is what you need for the Factory Posi (Trac-Loc))

CarNutCertifies · **Posted:** Thu Mar 22, 2007 10:54 am

ok i dont have the "posi" or "locking" dif i just get the one wheel spin so what would it cost to do the front, rear and t-case with lucas, 02 libert sport with a 5 speed

DarbyWalters · **Posted:** Thu Mar 22, 2007 11:40 am

A Good Link here with Weights and capacities:

http://www.amsoil.com/scripts/runisa.dl ... loaf:index

JJsTJ · **Posted:** Thu Mar 22, 2007 11:55 am

CarNutCertifies wrote:

ok i dont have the "posi" or "locking" dif i just get the one wheel spin so what would it cost to do the front, rear and t-case with lucas, 02 libert sport with a 5 speed

Lucas?!

CarNutCertifies · **Posted:** Thu Mar 22, 2007 12:47 pm

oops....AMSOIL sorry about that.

JJsTJ · **Posted:** Thu Mar 22, 2007 1:39 pm

CarNutCertifies wrote:

oops....AMSOIL sorry about that.

I forgive you. :lol:

PM sent.

unixxx · **Posted:** Thu Mar 22, 2007 5:55 pm

John almost had a heart attack :lol:

JJsKJ wrote:

Lucas?!

front diff oil?

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