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So seems to me that the penzoil synchomesh fluid will be fine for manual trans . Part #s dont matchup but penzoil site lists this stuff is for the truck. Any one please confirm before i do this thanks
 

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75w-90 Mobil 1 for the trans. Syncromesh for the tcase
 

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I use type F ATF. The brass synchros love it.

I believe synchromesh is actually quite similar. If that's the case, then you'll notice smoother shifting than with 75w-90.
 
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