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Old 06-04-2005, 06:57 AM
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transmission oil type.

Hi,

I have some gear grinding issues with my Doug Nash five speed transmission. It will gear grind when I actually get it out of gear bringing it to neutral. I didn't have this problem with the same transmission before major work on my car including opening the transmission to check it out. The transmission had standard 90 gear oil in it when I took it out but I've refilled it with Castrol 75-90 Syntech oil afterwards and am not sure if this is an acceptable oil for my transmission wich is an older 1986 model but otherwise in good shape.

A strange factor to this problem is that it would occur only once the motor (and transmission I guess) had fully warmed-up....
thanks for helping,
Ronald.

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Old 06-04-2005, 08:06 AM
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Different oils do not cause grinding. Gears, sliders, bent shift forks hitting stuff at the wrong time cause grinding.

That is not to say that some trannys work/shift better with syn oil over regular gear oil


gear grinding is an internal problem usually.... IF the shifter is adjusted correctly.

there are detents in the tranny internally that may be fouled up.

If it was worked on recently I would look there first




Quote:
Originally Posted by TVR383
Hi,

I have some gear grinding issues with my Doug Nash five speed transmission. It will gear grind when I actually get it out of gear bringing it to neutral. I didn't have this problem with the same transmission before major work on my car including opening the transmission to check it out. The transmission had standard 90 gear oil in it when I took it out but I've refilled it with Castrol 75-90 Syntech oil afterwards and am not sure if this is an acceptable oil for my transmission wich is an older 1986 model but otherwise in good shape.

A strange factor to this problem is that it would occur only once the motor (and transmission I guess) had fully warmed-up....
thanks for helping,
Ronald.
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Old 06-04-2005, 09:23 PM
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After seeing how synthetic wont climb the gears in this test of additives I would never use it.

http://www.bobistheoilguy.com/images/lucas/lucas.htm
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Old 06-05-2005, 09:28 AM
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Yet it is odd that several car manufacturers install synthetic oils at the factory now







Quote:
Originally Posted by 454me
After seeing how synthetic wont climb the gears in this test of additives I would never use it.

http://www.bobistheoilguy.com/images/lucas/lucas.htm
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