Trans and differential fluid

**98maro** · 03-28-2010, 02:19 PM

Ok guys. I have 98 ls1 6sp with 118 miles. So idk when was the las time The trans oil got changed. So I dnt have no idea what fluid to use and idk if any 1 of you knws what should I use. My friend did his to his mustang it's 5spd and he said he used autotrans fluid for his manual transmission
is that the one I have to use,? And how many should I put in there.
Also the differential. Is not leakin or anything but I'm gonna do that 1 as well. My friend said I could put some fluid that I could help with the posi traction cuz my it jst spin with one sometimes.
What can you guys tell me bout that and what should I do?
Thanks I really apreciate the help

**Cutlass** · 03-28-2010, 02:46 PM

dexron 3 in the trans.
your posi is worn out and would need to be replaced to make it better

**INMY01TA** · 03-28-2010, 04:19 PM

You'll need 4 quarts of Dexron III (I like Redline D4 atf) and 2 quarts of 80/90 gear oil. I use ANY dino 80/90. I also use a lil threadlocker w/teflon around the drain/fill plugs.

**98maro** · 03-28-2010, 04:59 PM

And how many do I nerd for the gears?
I remember my dad use to wash the gears and all the inside with gasoline.
And then put the oil in there. Do I have to do that?

**98maro** · 03-28-2010, 05:04 PM

What you mean my posi is worn out? Do I have to change the gears? Or what is it,
and is that expensive to fix?

**INMY01TA** · 03-28-2010, 05:17 PM

I said 2 quarts of gear oil. If you have to remove the cover off of the diff to drain the old oil, just spray some brake cleaner in there.

**98maro** · 03-28-2010, 06:08 PM

Yeah Im gonna take Off the cover.
So I jst spray some breake cleaner and. I could use any brand on the gaskets or any specific brand? What bout the fluid for the posi?
Thanks

**INMY01TA** · 03-28-2010, 06:24 PM

I don't use a gasket. Just run a bead of black silicone gasket maker around the edge, let dry before filling with fluid. I use any ole dino 80/90 gear oil with one bottle of GM limited slip additive.

**98maro** · 03-28-2010, 08:36 PM

For how long should I let it dry?
The fluid are not to expensive right?
All do it everithing my self. Never done but I guess I can learn lol

**RyanJM** · 03-28-2010, 09:09 PM

I have an a4 so not sure bout the tranny. The rear diff. I use redline with GM diff. Additive but I used royal purple last time since that's what Pep boys had in stock. 2 qts for the diff.

**98maro** · 03-28-2010, 09:16 PM

I think it's 4.
So it's a good idea to use an aditive for the gears right?
They won't get messed up or anything?

**RyanJM** · 03-28-2010, 09:19 PM

2qts for the rear and a bottle of the diff. Additive.

**98maro** · 03-28-2010, 09:31 PM

Ok thank. You. I'll go to autozone and get em tomorrow morning
I was told that I have to change the posi clutch to make it spin with both. Is it true?

**98maro** · 03-29-2010, 11:38 AM

Ok guys i went to the store and I bought everithing for the trans and gears oil
I bought 4 quarters of castrol dex/merc transmission oil.
And the gasket.
And also. 2 quarters of Lucas high performance/heavy duty 80/90 gear oil.
And some oil aditive, trans-x posi-trac GM #1052358.
I'm I usin the right products? Thanks

**cammed goat** · 03-29-2010, 02:10 PM

You should be fine.

**98maro** · 03-29-2010, 02:18 PM

Ok thanks. I'll start workin on it right now

**INMY01TA** · 03-29-2010, 02:41 PM

You'll want one of those red fluid transfer pumps they sell at autoparts stores and Sears to put the new fluid in. About $9.

**KMdef9** · 03-29-2010, 04:36 PM

Originally Posted by 98maro

Ok guys i went to the store and I bought everithing for the trans and gears oil
I bought 4 quarters of castrol dex/merc transmission oil.
And the gasket.
And also. 2 quarters of Lucas high performance/heavy duty 80/90 gear oil.
And some oil aditive, trans-x posi-trac GM #1052358.
I'm I usin the right products? Thanks

I might be too late with this, but if you a buy a product like Lucas, they typically come with the differential slip additive already added in. Having too much limited slip fluid will cause you to slip too much. Read the label to confirm, but I think Lucas does.

Originally Posted by INMY01TA

You'll want one of those red fluid transfer pumps they sell at autoparts stores and Sears to put the new fluid in. About $9.

+1.

I luckily had some hose and wasted only a few drops of the Royal, so that probably was a waste of $2 in fluid.

**98maro** · 03-29-2010, 05:08 PM

I only did the trans today I'm doin the gears tomorow
on the Lucas it does come with the aditive for the posi. So u guys won't recomend me to add more of the aditive I bought?

I'll go n buy that then. To make it easier.

I was thinkin to pain the cover red. U guys think the paint will come off?

**cammed goat** · 03-29-2010, 05:32 PM

[QUOTE=KMdef9;2286598]I might be too late with this, but if you a buy a product like Lucas, they typically come with the differential slip additive already added in. Having too much limited slip fluid will cause you to slip too much. Read the label to confirm, but I think Lucas does.
QUOTE]

Uhhh...will that cause any problems with carrier bearing failure?