2001AntiVenom

iTrader: (84)

Alright i have moser 12 bolt. what fluid should i use?

EPP

iTrader: (22)

80/90 weight non synthetic fluid. It the rear has an Eaton posi, use posi additive with it. If it has a Truetrac, you don't need the additive. Bob

2001AntiVenom

iTrader: (84)

alright thanks. Now for the stupid ?. How do i know which one it is. eaton posi or tru trac?

EPP

iTrader: (22)

If you're not sure what is inside of the housing, go ahead and put additive in it. It is not going to hurt anything if it does have a Truetrac. Or, you could elect not to put the additive in it, and if you experience chattering when turning corners, then go ahead and put additive in at that time. Bob

jimbo98z

iTrader: (3)

I would get on eaton's website and look at pictures of both diffs. The carriers look different and it will be pretty easy to tell wheb you pull the cover off. It's too easy to check to waste money on additive you don't need, or possibly risking some clutch damage by not using the additive if you need it. Just my buck o' five.

black01_WS6

iTrader: (13)

so how much will the moser hold, and what brands should We be looking at. I am changing mine out in 2 days and need to buy the fluid. I thought it takes 3 bottles or almost three?

Does redline have the additive mixed in with it?

also my front and rear seal are leaking on my 12 bolt- hey it has lasted 34k so far w/o problems. is it a gasket I need? have the upgraded rear end cover if that helps.

EPP

iTrader: (22)

Hi Mike, you will need three bottles of 80/90 weight gear lube - non synthetic! We usually go with the Napa brand. I think your rear has an Eaton posi in it, so get posi additive (friction modifier) for it, use two of them.

For the rear seal, just get a 12 bolt gasket from your local Auto parts store and I'd use some gasket sealer on it.

The front pinion seal should get a new crush sleeve when replacing it. If you don't replace the crush sleeve you risk damage to the pinion bearings. Many people get by without replacing the crush sleeve, but it is up to you. Here is a great article from Hot Rod Magazine on the procedure, they talk about the crush sleeve approx 1/2 down. http://www.hotrod.com/techarticles/d...ide/index.html Bob

black01_WS6

iTrader: (13)

Bob thanks for the link, a good read. Already picked up the fluid, So I will be going back tomorrow for the 12 bolt gasket. As for the crush sleeve, will the autoparts store have one or do I need to order from you?

Trying to get things in order- going th-400 and a lot more juice, and want everything else in top notch shape.

Thanks again

cambirdracing

iTrader: (4)

Auto parts store won't know what a crush sleeve is. Either the dealer or order it aftermarket.

Actually i take that back, I did get a crush sleeve for my 7.5 10 bolt from the HELP product line.

black01_WS6

iTrader: (13)

is there a difference between crush sleeves between the 7.5 and the 12 bolt?

SSD-MAN

iTrader: (1)

Why are you not recommending using synthetic? Just wondering? thanks

98camaroLS1M6

iTrader: (35)

How many quarts does a Moser 12 bolt take?

EPP

iTrader: (22)

http://www.exoticperformanceplus.com...html?item=1263

Installation instructions warn against using synthetic oil, and the instructions show how much gear lube to use. Thanks. Bob

kevinkr

Now that I have 500 miles breaking in my Moser 12-bolt I'm ready to change the fluid. Moser recommends NON-synthetic 80/90 gear oil.

I'm not sure if the brand really matters, but I did some research and I found this article containing several gear oil test results. In particular it covers 3 different brands of 80W90 NON-synthetic gear oil:

Castrol Hypoy C 80W-90
Pennzoil Gearplus 80W-90
Valvoline High Performance 80W-90

http://www.amsoil.com/lit/g2457.pdf

I went with the Castrol as it was the only one I could find up here in Canada and it was at Walmart. It also did the best overall of the 3 in the tests.