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Correct fluid advice

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Rivercrest View Drop Down
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    Posted: 23-May-2020 at 10:11AM
Hi to all, I just had my C6 transmission / converter over hauled by a local tranny shop who has been in business for 30 years. Tranny had 200,000 miles on it so pretty much all the internals were replaced. As I am doing my own re install, they suggested I should not use type f fluid and upgrade to a newer, non synthetic fluid which they will supply to me for the refill. Currently there is no fluid in place. I can't remember the fluid type but they said it would reduce long term varnish build up and as I have all new seals, bands etc etc this would be the right thing to do. I am not totally convinced and i am looking for other opinions. Thanks ( As a side note I have a new pail of Type F that I was going to use on the reinstallation.)
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albo74 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote albo74 Quote  Post ReplyReply Direct Link To This Post Posted: 23-May-2020 at 10:44AM
gee , so the original Type  F fluid went 200 thousand miles ,  and you got some .  I would use it .  Then again if they want to use their new and improved fluid AND warranty it for 200. thousand I guess you can't get hurt
albos73gts
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 23-May-2020 at 12:07PM
Dexron
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 23-May-2020 at 3:13PM
There are differences in the friction materials of today versus when the transmission was built. What type of rebuild kit did your builder use and what friction materials?  I used a Broader kit in my C6 and Broader recommends a name brand Dexron/Mercon 3.  He says if one is a "diehard Type F fan" that Type F is okay too and it will not damage modern friction materials.  He also says that a Mercon 5 semi-synthetic is good for cold or very hot climates, and that a full synthetic is good for over 2800 RPM stall converters or towing more than 10,000 lbs.  However, he indicates a bigger or more coolers are a better solution for high transmission temperatures.

FWIW, I ran Dexron in mine and no issues.  Plus its easier to find in the parts stores.
Vince

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 23-May-2020 at 4:04PM
my trans builder used Dexron in most jobs, along with the correct LubeGard product for units that require a specialty fluid like Mercon V.

he swore by the stuff, said it reduced his come-back failure rate significantly.

LubeGard Red is the supplement for Dexron

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Post Options Post Options   Thanks (0) Thanks(0)   Quote stanman Quote  Post ReplyReply Direct Link To This Post Posted: 24-May-2020 at 1:58AM
I'd use whatever the rebuilder says and use that Type F for undercoating or something.
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