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Kirkham Motorsports

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  • 2 Post By Dimis

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  #1 (permalink)  
Old 07-06-2016, 08:10 PM
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Default which transmission fluid for a toploader

My old notes say 75-90, but what say ye? Synthetic or not? Street driven not tracked. thanx steve
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Old 07-06-2016, 09:19 PM
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Regular old 90 gear oil.
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Old 07-07-2016, 12:21 AM
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I hear Bernica, who is a big fan of the toploader uses this stuff.

Bernica and 1795 like this.
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Old 07-07-2016, 04:44 AM
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Do not mess with it, good old 80-90 gear oil is what it needs.
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Old 07-07-2016, 07:53 AM
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GL-4 is normally recommended for older transmissions but most will agree that GL-5 works OK. There's an argument that GL-5 corrodes brass but a lot of people disagree it's an issue.

I would stay away from synthetic. Some say it will defeat the action of the syncros. I ran synthetic in a Muncie for about 15 years without issue, but recently changed it out to GL-4 which can be obtained at NAPA. Interestingly, the only thing I noticed different about synthetic was that the Muncie aluminum case took on an oily sheen appearance (but dry) like the case was permeated through and through with it.
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Old 07-07-2016, 02:44 PM
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80 gear oil. NO EP ( extreme pressure ) derivatives.
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Old 07-07-2016, 05:43 PM
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thanx. think i'll get a nice robust zinfandel for that cheese. s
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Old 07-07-2016, 06:25 PM
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Quote:
Originally Posted by Dimis View Post
I hear Bernica, who is a big fan of the toploader uses this stuff.

Funny DIMIS! Actuall, it's easier to stuff bananas in there! (old trick for rear ends) They quiet everything down.

Plain old 90wt is all you should need in a tried and true Toploader.
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Old 07-07-2016, 06:30 PM
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I forgot to add that you should put a stick of butter in as well! JK!
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Old 07-07-2016, 07:16 PM
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NOT synthetic
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