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Old 02-14-2008, 04:48 AM   #1
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Default Tranny fluid choices for grinds

I have a grind from 1-2nd gear pretty much every morning for the first 5 minutes. I don't know what's currently in the Miata. Haven't changed it since I bought it.

Gonna change out the fluid. Hoping for some recommendations from your guys' own experience w/ improving my grind situation. BTW, temperature range out here in central CA is 35 to 106 degrees.

Redline MTL or MT-90
Amsoil
GM Synchromesh

Thanks.
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Old 02-14-2008, 08:42 AM   #2
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when i changed my trans fluid i used Royal Purple and my 2nd to 3rd synchro grind went away
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Old 02-14-2008, 09:33 AM   #3
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Quote:
Originally Posted by kenzo42 View Post
Haven't changed it since I bought it.
Unless you JUST got the car, this is an MNet question.

I would venture to say that most of us change all the fluids first thing when we get a new to us vehicle.

As a side note, I bought a 1991 BRG last fall and lent it to someone for a week before I had a chance to change everything out. When I got it back with the comment that the shifter rattled, I found that there had NEVER been oil in the turret.
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Old 02-14-2008, 10:09 AM   #4
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I'm happy with mobile1, and I did 35+ hours of track time last season.
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Old 02-14-2008, 10:15 AM   #5
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The fluid needs a few minutes to warm up. I run Severe Gear fluid in my transmission and it takes a little bit to get it warm enough for smooth shifting. However, it protects the transmission far better than standard fluid. Maybe standard synthetic would be okay.
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Old 02-14-2008, 11:33 AM   #6
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if anyone besides the op says redline I'm gonna make them drink a quart of it.

amsoil or synchromesh. or bg synchroshift.
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Old 02-14-2008, 11:40 AM   #7
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Quote:
Originally Posted by y8s View Post
if anyone besides the op says redline I'm gonna make them drink a quart of it.

amsoil or synchromesh. or bg synchroshift.
I think i used the Royal Purple Synchro **** and it was super thin compared to what i was expecting.

Have you used the Pennzoil Synchromesh or put the BG you said you had laying around in yet?
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Old 02-14-2008, 11:59 AM   #8
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i notice a difference once i poured synchromesh in there, no idea what PO used, but synchromesh made a difference in noises and sounds that were questionable
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Old 02-14-2008, 01:43 PM   #9
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Synchromesh may be on the thin side for our transmissions. It's similar to a 5w30 fluid, whereas a 75w90 viscosity is recommended for our transmissions. The things I've read on RP indicate they shear and are viscosity unstable after little mileage. IMHO, Amsoil or Redline and you're good to go.
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Old 02-14-2008, 01:49 PM   #10
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I went with royal purple because that's what the closest parts store had when I did the clutch. 1-2 grinds when really cold. Maybe I'll go with amsoil from Rick next time, but so far I'm OK.
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Old 02-14-2008, 02:11 PM   #11
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Motylgear 75-90
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