[rtkraken]

Hey Guys,
Working on our new addition to the family, son's 95 LWB soft dash Classic. Replacing the viscous coupling. Emptied the transfer case of it's oil, to get started, and out comes a nice golden thick oil. Slightly thicker than engine oil, about the same color. :shock:
Was expecting ATF. Any advice or experience with this? All specs say ATF, that I could find... :think:

 

[cnfowler]

Sounds like it was filled with gear oil. A lot of transfer cases call for gear oil and the previous owner probably made the mistake of ASSUMING the RRC gearbox takes the same. Obviously, they were wrong.

Colin

 

[rtkraken]

Yeah, finished the viscous replacement and refilled with Mobil 1 ATF. What should have been in there to begin with... :roll:
Oh well, we'll see how the t-case runs now. Can't imagine it would cause any problem.

 

[DieselBoy]

This is strange.

I am going through my 89 doing a baseline service, all oil's and fluids etc.

My Hayne's manual specifies a 90w oil for the Borg Warner viscous transfercase, which is consistant with what you drained by the sounds of it.

It specifies ATF for the LT230 T.Case, and also ATF for the LT77

Very interested to know if its a cock up in the haynes manual or not before I go put the 90w in (lucky as was going to do this last night !!!!!!)

Pete.

 

[classicjack]

Owners manual and service manual specify ATF Dexron HD, ATF M2C 33G, Texaco 4291A Universal. There is an oil pump in the rear case,which oils the planetary gears that would probably have a hard time pumping 90W gear oil.

 

[DieselBoy]

Cheers, yes I see the pump in the diagram.

Pleased I found this thread when I did, otherwise It would have had T.Case full off 90w oil :shock: :shock:

Thanks `) `)

 

[OzRover]

90w might be a tad thick... but
Interesting timing. I just had an interesting exchange of emails with the technical department of Penrite Oil Company.
To make a long story short, when I took delivery of my '93 LWB it had a seized viscous coupling. *&^$%, anyway, after dropping $900 bucks for a new part I was trying to do the best thing and came across a Penrite spec sheet. I put in 75(SAE75-80) manual gear oil in. Later, after I noticed my manuals suggested AFT Dex II, I panicked. How would affect my new VC? HO NO!!!!
This is what the Penrite tech told me today:
"The manufacturer suggests that the same fluid used in the automatic transmission may be used in the transfer case (a Dexron II ATF).
Whilst this is the case, we have found that Manual Gear Oil 75 (SAE 75W-80) gives better performance, hence it is our recommendation."
I think the '95 RRC factory manual suggests 75w-80 instead of ATF. Maybe they finally figured it out. The transfer case has a pump in it, but then again it has a chain too.

 

[rtkraken]

My RAVE for 95 says, "ATF Dexron IID". Oh well... it's probably not critical. But it is interesting that such different fluids can replace each other.