has anyone ever tried using redline fluid for the differential and tranny?

or the GM synchromesh?

 

Carpe diem you've been a great help and i hope they will ship to my APO address! Anyone have any answers for the Synthetic Differential Fluid? As far as use I mean

Philly

 

1.43 quarts. I used 75-90W.

It is kinda messy, - clean the drain plug off, the magnet will have metal shavings on it.

 

currently using redline 75w-90 synth gear oil in my diff. drivetrain felt less draggy after using redline. also, the fact that redline has stepping additives helps prolong ur diff if u can't always warm up the diff before driving at normal speed.

 

Can someone post the steps on changing the Diff. Fluid? i think i have to change it soon. . its been like a yr and is it that messy and hard?

 

*** Edited as suggest by 99lsguy***

Yikes, another thread that won’t die. Ok, here goes.

1. Drive around for ½ hour to warm up the diff.

2. Pull onto a level surface.

3. Block the front wheels, jack up the rear end and support with jack stands

4. Locate the differential (it’s that big round thing that’s in the center between the rear wheels).

5. Place a catch pan under the diff

6. Remove the upper fill plug

7. Remove the lower drain plug and let all the oil drain into the pan

8. Clean the plug and reinstall it.

9. Leave the catch pan there to catch your mess from step 10

10. By whatever means you have, refill the diff until the fluid reaches the level of the top plug hole and starts to dribble out.

11. Clean and reinstall the fill plug.

12. Remove the catch pan and responsibly dispose of the old fluid.

13. Undo step 3 and 2.

14. Clean up your mess

Step 10 is the messy one. Some of the diff fluids are delivered in bottles with a spout. While you won’t have enough room the turn it up on end and squeeze it out, you may be able to attach a piece of flexible tubing and squeeze it up through that. Another useful tool is one of those suck pump things. These look kind of like an old fashioned grease gun. When you pull back on the rod they fill with whatever fluid the tip is immersed in and then when you push it back the fluid is forced out. Make sure the end is fitted with a foot long piece of flexible tubing.

By the way, the recommended service interval on this is every 15K miles.

George

 

As a note to above procedure,

Make sure you loosen the top "fill" plug first. You don't want to get "stuck" with an empty diffy!

I know this has little or no chance of happening, but just in case......

And yes, It's just kinda messy.....

 

Thanks Carpe Diem no wi have a project this weekend =D

 

I might have to do this on my 90 LS, are the procedures the same for the LS as it is for the SC?

 

Those are pretty generic. I think they work for every RWD car I've ever owned, domestic and foreign.

George

 

will changing the diff fluid eliminate that drag i feel when im in 3rd at like 15 mph i hear /feel alot of drag.,.,.

 

Not likely. Any drag from the diff should be the same at all speeds. That sounds like a tranny or tuning issue to me.

George