Leaking axle shaft seal on rear end, need help finding parts

[BigBadJohn]

As far as transfer case fluid goes, if it's an NP241 (floor shifter) or NP243 (push-button shifter with 2HI, 4HI and 4LO) then you need Dexron 3 or 6 ATF. If it's an NP246 (push-button shifter with 2HI, 4HI, 4LO and AUTO) then you need the GM Autotrac II fluid. Here's some links to the correct GM fluids, I use this stuff in both of my '97s with the exception of the Autotrac fluid as my 'burb has an NP243.

ACDelco 10-4051 GL5 80W-90 gear oil with no additives:
https://www.amazon.com/gp/product/B007Q10F3S

ACDelco 10-9395 Dexron 6 ATF:
https://www.amazon.com/gp/product/B01EKMGG92

ACDelco 10-4017 Autotrac II transfer case fluid:
https://www.amazon.com/ACDelco-10-4017-Auto-Trak-Transfer-Fluid/dp/B002H8U3KK

So my differential from the factory called for 80w-90? That’s one thing I’m very unclear of because I see a lot of people saying synthetic 75w-90 and I see others saying conventional 80w-90

 

[df2x4]

So my differential from the factory called for 80w-90? That’s one thing I’m very unclear of because I see a lot of people saying synthetic 75w-90 and I see others saying conventional 80w-90

Yup. Like I said, factory spec is GL5 80W-90 conventional with no additives. Exactly what I linked to in my last post. I'm sure synthetic 75W-90 would work if you could find it with no additives, but most of them already have some type of additive and that's no good for the G80 carriers in these trucks.

 

[df2x4]

Okay so from what I gather on the manual transmission and transfer case fluid, it’s actually Dexron III-H but they’re not calling it Dexron III because they’ve “phased out” DexIII. Do manual transmissions and transfer cases work better on III than VI to where they’d bother rebranding this?

I honestly have no idea about that... Personally I would just use Dex 6. It's backward compatible with all Dex 3 applications, I'm running it in both of my trucks' automatic transmissions and the NP243 transfer case in my Suburban.