Tranny/Diff Oil Change
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So, this is funny - I went to Autozone yesterday to get some supplies to change the diff and tranny oils - and I asked them what recommended fluids were for both - they said that regular engine oil was recommended for the tranny! Is it just me, or is that weird?!?!
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From: Gadsden Purchase
Originally Posted by jfarcas
So, this is funny - I went to Autozone yesterday to get some supplies to change the diff and tranny oils - and I asked them what recommended fluids were for both - they said that regular engine oil was recommended for the tranny! Is it just me, or is that weird?!?!
I've read in a couple places, and the sources really should know... that GL-5 has stuff in it that attacks (however slowly I don't know) the brass parts in a T18 and so you're supposed to use GL-4, not GL-5.
I use GL-5 in my T18 anyway. YMMV :)
Friction modifier is needed with any brand LSD;) Ford used.
Just been down that road with Mobil1 gear oil and my Ford 9inch with Traction-Loc.
It sez on the Mobil1 bottle it's good for limited slip differentials as if it doesn't need a modifier. Salesmen/marketing wrote what's on the bottle not automotive engineers. :)
Alvin in AZ
ps- I don't know where this post is going to go :/
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GL-4 or GL-5 for 4-speed transmissions?
Last night I finished rebuilding a 4-speed T19 transmission and used I used an GL-4 oil to fill it, specifically 75W90, as I had read in previous posts that it was better than the GL-5 oils (which are recommended for LSD differentials). Could somebody verify whether or not the GL-5 oils damage (sooner or later) the brass synchros in transmissions like T18, T19 etc.? Thanks, Raul
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