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Interesting... OD engaged and worked normally with trans cold 200 1984

posted by  Will740turbo on  Wed Feb 9 02:35 CST 2011
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last visit: Wed Oct 22 16:09 CST 2014
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So, I was playing around with my non-functioning M46 overdrive the other day while on the freeway with a cold engine.
The OD engaged, stayed engaged, and in essence WORKED with a cold engine.
Yes, I still need to replace the seals, but I can't get to it until a few months from now. Is there an additive I can add, or fluid I can replace my current ATF with to safely increase the viscosity?
The manual lists both 10w-30 and 20w-50 as being a suitable lube for the M46.

Would a higher-viscosity fluid probably work just fine?

EDIT: According to a few things I just stumbled upon, it's equivalent to something like SAE5 (That's not a typo) at 212F.
2nd EDIT: Or maybe it's 5w-20. Either way, it's much less viscous than 20w-50. Anyone have good or bad luck running 20w-50 in an M46 gearbox? I think I've asked before. The trans already needs 1st gear synchros and 2nd is not far behind.

Happy Bricking






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New Interesting... OD engaged and worked normally with trans cold [200][1984]
posted by  Will740turbo subscriber  on Wed Feb 9 02:35 CST 2011 >


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