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Discussion Starter · #1 ·
I'm thinking that I do not have a positraction rear end on my 79 PowerWagon - but if I did, and I replaced the gear oil with 90 weight, and added 4 ounces of Friction Modifier, would that hurt anything?
 

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Jack the rear end up and spin a tire, if the other spins the opposite way you have an open diff.
 

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I don't think so, but you wouldn't gain anything either. Use Lucas gear oil instead.
 

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Do what RJB suggested. That stuff isn't real cheap and there is no sense in adding it if you don't need it. But no it would not hurt anything.
 

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Isn't that friction modifier only to keep the clutches quiet or does it mechanically need it.
 

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Discussion Starter · #7 ·
I just saw that if you have a limited slip dif, you need to add the stuff, and since I do not plan on takeing the rear cover off to see if it is a LSD, then I thought I would just add the stuff regardless, since I already bought it, and not worry if it didn't hurt.
 

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it aint very hard to take the cover off. a matter of 10/12 bolts and a tube of rtv. might be a good excuse to drain the diff anyways.

never know how much water is in there from some previous owner who thought it was a swamp buggy.

i ve heard many a times where people found a "chocolate milk" concoction in their diff.
 

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Discussion Starter · #9 ·
Good info - may have the day off tomorrow - RTV is that gasket sealer - my cover looks like the bottom was bent backwards - do you make a gasket, or just use a lot of some kind of goo? (new to all of this...)
 

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Forget that RTV.....Get a gasket for it and then you can just use a few dabs of RTV to hold the gasket in place.......Then in the future it'll be a lot easier to get off.
 

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If it's a 9.25 there is no gasket. If you want, go to NAPA and get some material and cut your own, if not just use RTV.
 

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joe swinehart said:
the factory didnt use a gasket. if you let the stuff cure properly there is no need for such gasket.
Both my 77 RC's had gaskets on them and I bought the trucks brand new. ???
Mopar part # 3507691
NAPA# NGAP29352

Point being that the FSM states that you can use RTV but there is still a gasket that was or can be used.
 

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Chump said:
joe swinehart said:
the factory didnt use a gasket. if you let the stuff cure properly there is no need for such gasket.
Both my 77 RC's had gaskets on them and I bought the trucks brand new. ???
Mopar part # 3507691
NAPA# NGAP29352

Point being that the FSM states that you can use RTV but there is still a gasket that was or can be used.
Well I'll be damned! Learn something new all the time. I love this site! :)
 

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Chump said:
Any good auto parts store will have the gasket.
74-93
GOOD is the operative word here. You hafta go to a parts house that actually has a fel-pro book, and counter help that know how to open and flip to the back of it and find the one you need. There is a difference between a parts hand and a computer-reader. ;D
 

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lol, I went to NAPA to get a gasket and was told it was dealer only. I went ot the dealer and they told me there was no gasket and they use Mopar brand RTV.

THEN......I bought a Yukon master rebuild kit from Randy's Ring and Pinion and they included a gasket for it. Go figure. ;D
 
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