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Wishbone
Active Member

10 Posts
Posted - 10/11/2011 :  08:37:12 AM  Show Profile  Visit Wishbone's Homepage  Reply with Quote
What type of Fluid should I use in my 1985 Allison four speed automatic transmission behind my DT466?

Fastback
Top Member

1500 Posts
Posted - 10/12/2011 :  08:48:53 AM  Show Profile  Reply with Quote
Dexron or Type C4 rated oils are approved fluids. Some 15W-40 and 30 motor oils are approved C4 oils.
Why yes, the ORIGinal CHARGER is a Fastback
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Wishbone
Active Member

10 Posts
Posted - 10/12/2011 :  11:52:29 AM  Show Profile  Visit Wishbone's Homepage  Reply with Quote
Thanks for the info,
Wishbone.
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IBTMech
Top Member

USA
973 Posts
Posted - 10/12/2011 :  3:51:25 PM  Show Profile  Visit IBTMech's Homepage  Reply with Quote
Depending on where you are, Dexron III is the best oil to use. I wouldn't use 15W40 up here in Maine. That oil would be gelled at -15.

Mobilfluid 424 is approved for warmer climates.
If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years.
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mastertech
Advanced Member

274 Posts
Posted - 10/12/2011 :  11:34:49 PM  Show Profile  Visit mastertech's Homepage  Reply with Quote
From my experience an auxiliary tranny cooler and transynd oil can make a 545 survive behind a 466. Especially ones that go up any hills on there route.
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