redline 75w 90 or shockproof???

[e30 gangsta]

I was wondering what yall suggest?? I have heard shockproof locks up harder and faster. We are talking about final drive gear oil btw.

[Charlie]

Unless you're talking a fresh, rebuilt diff, I wouldn't run shockproof in a 150k+ mile rear end.

-Charlie

[DanGillan]

even in freshly rebuilt diffs, diffsonline suggests redline 75w90 with an lsd additive. we've had the best results with it.

[Charlie]

even in freshly rebuilt diffs, diffsonline suggests redline 75w90 with an lsd additive. we've had the best results with it.

Why would you add a LS additive to the regular 75w90? The NS varient, maybe.

-Charlie

[DanGillan]

yea, i just meant to make sure it has lsd additive in it, not to add more

[DaN]

[threadjack]
How would shockproof work in a noisy 235k gearbox? Would it quiet it signficantly, when compared to synthetic 75w-140?

[Charlie]

[threadjack]
How would shockproof work in a noisy 235k gearbox? Would it quiet it signficantly, when compared to synthetic 75w-140?

It would hasten putting it out of its misery.

-Charlie

[DaN]

So you're saying it would wear it out sooner? Why?

[trent]

You guys should be running a non-detergent 50W. I have found that works best. :up:

[Charlie]

So you're saying it would wear it out sooner? Why?

Shock proof is very light, it's intended for qualifying laps and drag racing, not normal street or race usage. It certainly wouldn't quiet a diff, and I'm sure wouldn't be good for a higher mileage unit.

-Charlie

[e30 gangsta]

so basically return the shockproof?

[Mot]

ya, get redline... unless you hate your diff.

[Charlie]

so basically return the shockproof?

I personally would not run it in an older diff, but have not actually tried it. YMMV. I would actually love to see a dyno pull between "conventional" fluid and the shockproof in an e30 diff.

-Charlie

[mspiegle]

don't mean to question your knowledge, but the redline website makes it sound like it is a very high viscocity fluid that prevents breaking gears in high-torque applications. Where is your info from?

[Charlie]

don't mean to question your knowledge, but the redline website makes it sound like it is a very high viscocity fluid that prevents breaking gears in high-torque applications. Where is your info from?

Unless this is a different "shockproof" (could be), it's typically a very light gear oil designed for minimum driveline loss for drag racing and qualifying applications.

Gimme a link to what you're seeing.

-Charlie