saab 9000 gear oil

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I recently bought a 93 9000cs turbo 5sp, with an inoperable clutch. Was told it was diagnosed with a failed slave cylinder.

So I pulled the tranny out, changed the clutch, pp, release bearing, slave, and find the master is also shot. Change that and now the car drives.

However, after doing all that, I find that 2nd gear grinds real bad and won't go in when driving enthusiastically. At lower revs / shifting slower, the syncro seems to function well enough, going into gear without double clutching, and without grinding. But at higher revs, and with faster shifting, it will either grind really fiercely into gear or grind and not go in gear. So I've gotten used to double clutching in the meantime, but even still, there's too much added time waiting for the revs to match, or it'll grind nonetheless obviously.

The tranny has no drain plug, but I flipped it upside down and dumped all the old oil out. Right now it's using conventional chevron 10w30. The haynes manual seems to say to not use any type of synthetic oil for the gearbox.

I'm not looking to do another teardown to swap the tranny anytime soon. At least not until I can find one with the right gearing available locally, and even then, it'll probably sit around for a while before going in (dropping the tranny on a 9000 is a big of a pain..).

In the meanwhile, is there any other oil anyone suggests I try? I imagine I'm going to need to siphon out the old oil through the fillhole.

It calls for 2.5qts 10w30/10w40 I believe. I've had good luck with penzoil syncromesh in the past, but that was for 75w90 applications. I'm imagining that'd be way too thick for this tranny?

Again, under normal/light driving conditions, the 2nd gear syncro seems to work well enough.


Thanks
 
I'd use the amsoil 5w-30 mtl if it wants engine oil. I haven't found better stuff, and it performs better than redline which is another favorite. However, the right chemistry for the synchs may be key, so you may want to get dealer fluid.
 
Pennzoil Synchromesh is almost exactly the same viscosity as a 5w-20 motor oil (51 cst @ 40C, 9 cst @ 100C) meaning it's actually /thinner/ than what is called for by the manual.

It very well could help that tranny along if you created a bit of a uh, "custom" blend... 2 qts 10w-30 and 0.5 qts Synchromesh, mayhaps?
 
jesus, I had been under the impression that gm/penzoil synchromesh was an alternative for 75w90/80w90 gear oil. All I know of it is that the vw guys swear by it, and it's worked extremely well on 3 vw's of mine.

Hmm, perhaps I'll try that first since I still have a few quarts left over. Maybe then I'll try amsoil, but most likely, the syncros are just shot.

Thanks!
 
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