?? Changing drive line fluids??

[Retep]

My truck is about to hit 25k ticks on the clock. I have decided it is time for a little more than the oil, filter and lube services I have been doing at 3000 mile intervals.

I am going to change the fuel filter. This looks like a fun job .
I am also going to change the fluids in the transfer case and both diffs. I had the dealer do the G80 required fluid change at about 4000 miles. I have never done this before, and have a few questions.
1. Is there a torque spec for the bolts on the rear diff cover or can I just tighten normally?
2. How do I get the fluid in the diffs and t-case? It looks as if there is no room to tip a bottle up into the fill holes. I am thinking of using a funnel with some tubing on it and helper to either pour the fluid in the funnel or hold the tube in the fill hole.
3. The t-case takes DEX III, can I use any GL-5 rated 80W90 for the diffs or do I need to use the stuff from the dealer?

I will do a trans fluid purge and filter change in another 5-10k miles.

Thanks,
Pete

[HenryJ]

...
1. Is there a torque spec for the bolts on the rear diff cover or can I just tighten normally?
2. How do I get the fluid in the diffs and t-case? ...
3. The t-case takes DEX III, can I use any GL-5 rated 80W90 for the diffs or do I need to use the stuff from the dealer?...

1. Differential cover bolts 20 ft lb , or tighten normally.
2.A tube on the fill nozzle included cap, and squeeze it in , or one of those plastic pumps.
3. Helms manual - Lubricants for rear axle :

With RPO G80 1052271 only

Without RPO G80 (open diff) 1052271 or SAE 80W-90 GL5

[Retep]

hmm..... I guess if the GM stuff is not to expensive, I will use it. I do have the G80, but a lot of the guys at zr2.com just use a quality GL5 80W-90.
How many bottles of the 1052271 are required for doing both diffs? I guess I could figure it out for myself, but sometimes I can be a little lazy .

Thanks,
Pete

[HenryJ]

I'm not going to contribute to your lazyness

The capacity is in the above linked thread.

P.S. some of those guys on ZR2.com have had problems with the G80.
I don't know if it is related, but I am happy with mine.

[barch97]

2.A tube on the fill nozzle included cap, and squeeze it in , or one of those plastic pumps.

[Retep]

OK Brule, you talked me into it. Your right about some guys at zr2.com having problems with the G80. Mine works as it should and I would like to keep it that way. I will use the GM lube.

I thought the 2.5 bottles as stated in the linked thread was for the rear diff only. If I recall, my owners manual gives the capacity for the rear but not the front. I will have to check that again.

Thanks,
Pete

[HenryJ]

...I thought the 2.5 bottles as stated in the linked thread was for the rear diff only....

You only need the GM "special" lube for the rear.
You can use SAE 80-90w for the front.

The rear only needs two quarts , but they only sell the GM "special" lube in 23 oz. bottles , if I recall correctly. That is why you need two and a half bottles. (Yes, it is a rip-off)

[Retep]

I went to my dealer last night to get few bottles of the 1052271 axle lube and he gave me 89021671. When I questioned him on the different part number, he said that the number had been changed. This stuff is labeled as 80W-90 and exceeds GL4 standards. It also says it is compatible with all friction modifiers.
Do I have the correct stuff???

Pete

[Mat73GNZ]

I replaced the fluid in my rear differential with Mobil 1 sythetic fluid. Honestly, the differential works better than it did before! Now I can't wait for winter time around here so I can kick out the rear end in the snow going around corners, instead of just the inside wheel spinning (stupid G80 ).

!M!

[ExMoparMan]

I used Royal Purple gear oil and I agree I think mine works better since I put it in. I think it took 2.5 bottles to do both diff's.

[Ken]

2.A tube on the fill nozzle included cap, and squeeze it in , or one of those plastic pumps.

barch97 are you running the AMSOIL 75w-140 gear oil in your C.C.? If so, was there a particular reason you went with the heavier weight?