mazukamba

Hi:

What kind of oil is the best one to use on the transfer and the differential? I'm going to replace the gasket so I want to use the best product on my 88 XJ so works perfect on mud. Also, have someone instrucctions and pictures step by step?

pistolspark

The trans guy at the dealership had me use atf+4 in the transfer case and 75w90 gear lube in the front and rear axles.

BlueXJ

Use the same as the AW4 tranny in the transfercase. Dextron III or IV in the tranny and the transfercase.

75W90 gear lube in the differentials.

sk8ertht540s

atf+4 in tcase and i run 75w140 in my axles. so does pistolspark he just doesnt know it

xjjeepthing

Dexron in the T-case, 75w140 Synthetic in the diffs. AW4 trans takes Dexron as well

TrekkerJmm

I used 75/90 with the additive for the posi unit in the rear with the clutches...Tj
PS if you have those clutches (posi unit) you should put the additive in or you can ruin the clutch pack or so I was told by the dealer.

whowey

ATF+4 is wrong for the AW-4 tranny... No matter what that stupid TSB says.

Dexron II is what Aisin designed it to use, Dexron II isn't available anymore so III or IV are fine. Just not VI, its a special synthetic with specific applications.

Transfer case.. Dex III or 4 also.

The diffs... it will depend on several factors. Usage, towing, temperature ranges the diffs operate under. But 75w90 for lighter duty applications and something heavier in more severe duty.

LSD additive only goes in if you have an LSD. It basically helps keep the clutches from chattering.

5spd-XJ

I use royal purple synchromax in the t-case and RP max gear 75-90 in the axles

BlueXJ

mazukamba listen to whowey he is our resident lubrication expert. He and xjjeepthing are the top guys in that regard on this site. The rest of us are good but they are the experts.

SeriousOffroad

DexronIII in the T-case and AW4, 75w140 is recommended by Dana for all axles that see extreme duty. A friction modifier is mandatory for limited slip differentials. Failure to use it will ruin the clutches in no time flat.

pistolspark

Im sorry i do have 75w140 in the axles sk8ertht540s put it in when i was at work.

TrekkerJmm

Does anyone know if the T-Case chain moves if your not in 4 wheel drive or does it have to be in "Part Time" I have NP231...Tj

SeriousOffroad

No, But why is that important? Curious about your question.

BlueXJ

I think it moves when the vehicle moves but as Frank asked......... WHY?

TrekkerJmm

Just wondering how mine wore out. If it moves all the time that would explain it with 200,000 miles on mine...Tj