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Old 07-21-2014, 08:08 PM
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What type of trans fluid is best to use?

Preparing to install my new converter into the transmission and put the engine back in this weekend. Coan recommends either DEX/MERC III type F or FA or Amsoil synthetic universal transmission fluid. Does anyone have a recommendation which would be better for a street driven car that probably won't see track use? Motor is a blown BBC and the converter has a stall speed of 3800 rpm and is a ten inch size. Coan suggested using the synthetic fluid for street performance but the stuff is almost $12.00 per quart at my local supplier. Is it worth the cost? Thanks for any replies.

Joe

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Old 07-21-2014, 10:11 PM
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Dont switch to type f from dextron unless you want to rebuild that tranny.Type f will swell all the rubbers. I would just keep fresh regular atf in it.
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Old 07-22-2014, 08:35 PM
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I know you know this but I will say it anyway. Be sure to put some in the converter first.
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Old 07-22-2014, 10:01 PM
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Behind a big HP blown application do some reading on John Deere "Hy gard" fluid... cut with a litre of conventional fluid to add color so you can see it (hygard is clear). Works very well and is fairly inexpensive.... I'm about to use it in my TH400 behind a single turbo 383.
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