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Another question is: Can you use anyhting other than the GM Syncromesh or Royal Purple SyncroMax? Can an 85W140 weight or 75W90 or synthetic 75W90?
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sigpic1993 Pontiac Grand Prix SE, 3.4L DOHC 24 Valve V6 MFPI, 5 speed, completely stock, bucket on a budget! -
If you want....1991 Grand Prix STE
3.4 DOHC
1 of 792 Produced
Extensive Mods Done
1991 Lumina Z34
3.4 DOHC
Getrag 284 5spd
1 of 30
Canadian Z34 Models Made with the Getrag 5spd Wahoooo!
1980 GMC Sierra Classic C25 With 18,000 ORIGINAL MILES!!!!
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I just don't want to damage my gear box or seals in it. I know some gear boxes are very finicky about the type of oil you use in the gear box. So would a heavy 85W140 work fine or a light 75W90?sigpic1993 Pontiac Grand Prix SE, 3.4L DOHC 24 Valve V6 MFPI, 5 speed, completely stock, bucket on a budget!Comment
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The Synchromesh is a lot lighter then gear lube. Gear lube is for differentials and outboards. Even my truck doesn't use gear lube in the transmission, it uses dexron, lol.-60v6's 2nd Jon M.
91 Black Lumina Z34-5 speed
92 Black Lumina Z34 5 speed (getting there, slowly... follow the progress here)
94 Red Ford Ranger 2WD-5 speed
Originally posted by Jay Leno
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75W-90 was the original wieght, but I would go with a synchromesh fluid if your re-filling it.......
You won't believe how much smoother it shifts.....1991 Grand Prix STE
3.4 DOHC
1 of 792 Produced
Extensive Mods Done
1991 Lumina Z34
3.4 DOHC
Getrag 284 5spd
1 of 30
Canadian Z34 Models Made with the Getrag 5spd Wahoooo!
1980 GMC Sierra Classic C25 With 18,000 ORIGINAL MILES!!!!
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i saw an episode on HPTV once in which they dyno'd i believe it was a camaro before & after with royal purple fluids & gained like 3-4 whp. impressive but who knows how god-awful the fluids that had been in it were...
they also prolly spent $100+ on all the different fluids because that crap is expensive!!Comment
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Well, I think I'm going to go with the Royal Purple SyncroMax because I used conventional oils in my old Subaru and when I changed to Royal Purple, the car ran totally different, was a lot smoother, idled smoother, and acceleration got a little too peppy. That was only driving it after 100 miles or so. I think the additives coat micro-fissures and cracks in the block....who knows? Cause I know my Suby had a lot of blow-by and it stopped after RP.sigpic1993 Pontiac Grand Prix SE, 3.4L DOHC 24 Valve V6 MFPI, 5 speed, completely stock, bucket on a budget!Comment
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