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Old 09-14-2020, 03:49 PM   #1
SloCal
 
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Hot Trans Temps/Overfilled M6

After i bought my car with 25k on it I swapped the trans fluid from stock to redline d4 atf. I had amsoil on my last ss and it worked great but tried redline this time.

I initially filled a bit below fill line per instructions but it was really notchy and almost money shifted a few days after and temps were hotter than on old car (125 degrees driving super calmly on freeways up to 150 on freeways in 90-100 degree heat).

I then topped it off to see if it would cool the trans temps a bit but it's been the same since and gets up to 150-155 in the recent heat wave of 100-110 degrees.

I'm going to the track soon and wondering if I should just (a) empty out some fluid so that it's per Chevy manual level or (b) do another full swap as I might have f**d it up by topping off?

also curious for anyone's perspective on d4 atf temps in ss and 1les here. i feel like it shouldnt be more than 180 on track and it's already at 160 in super hot weather coasting at 1800 rpm
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Old 09-15-2020, 01:13 PM   #2
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I can't speak to your track/driving temps but I have owned at least one manual transmission vehicle at all times for about the last 45 years. I can tell you there is no advantage to overfilling the transmission. It will not help with temps and can in fact help create additional heat. Overfilled transmission fluid will foam (aerate) from the churning (instead of splashing) in doing so it doesn't flow well. When it doesn't flow well, it doesn't lubricate well. When it doesn't lubricate well the parts heat up and because the fluid is foamy it doesn't carry away heat well. This is an oversimplification but I'm sure you get the idea.

As for the Redline d4, some lubricants just don't work well in some applications. I would go back to the Amsoil (I think it has more unicorn urine in it then the Redline anyway) or even try the OEM stuff and see how that works out.

The previous owner could have used an improper fluid and damaged the bronze sintered components (Synchros). GM hasn't officially licensed any DEX III since 2011 and it has been superseded in almost all automatic transmission applications. But it's still used in manuals because it doesn't damage brass or bronze components.

Hopefully some of the manual SS guys will chime in about your temps (I'm clueless).

No matter what you choose, just fill as recommended by the manufacturer and if it's still overheating and/or not shifting properly it may actually have a mechanical issue.

Please keep us posted as to your outcome as it may help someone else.

JMHO
No expertise implied or expressed
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Old 09-15-2020, 06:59 PM   #3
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My M6 runs as cool as a cucumber in the Texas heat with Royal Purple Syncromax.
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Old 09-16-2020, 07:05 PM   #4
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Quote:
Originally Posted by SloCal View Post
After i bought my car with 25k on it I swapped the trans fluid from stock to redline d4 atf. I had amsoil on my last ss and it worked great but tried redline this time.

I initially filled a bit below fill line per instructions but it was really notchy and almost money shifted a few days after and temps were hotter than on old car (125 degrees driving super calmly on freeways up to 150 on freeways in 90-100 degree heat).

I then topped it off to see if it would cool the trans temps a bit but it's been the same since and gets up to 150-155 in the recent heat wave of 100-110 degrees.

I'm going to the track soon and wondering if I should just (a) empty out some fluid so that it's per Chevy manual level or (b) do another full swap as I might have f**d it up by topping off?

also curious for anyone's perspective on d4 atf temps in ss and 1les here. i feel like it shouldnt be more than 180 on track and it's already at 160 in super hot weather coasting at 1800 rpm
https://www.camaro6.com/forums/showp...7&postcount=49

See that post for the service manual verbiage. You could simply pump 8 oz out. I marked an old water bottle to 8 oz, then used the same pump that i filled it with to drain that small amount out.
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Old 09-18-2020, 10:11 AM   #5
MatthewAMEL

 
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ATF expands when hot. The removal of 8oz is to compensate for the expansion.


I also ran D4 until speaking with a Tremec rep and him explaining a few things about extending the life of the -6060 when tracking.


I switched to their HP fluid. It's not ATF and doesn't have the same expansion properties. You can fill until full.


As for your scenario, I would not track with a full case. Take some fluid out.
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Old 09-26-2020, 08:06 AM   #6
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Tick Performance advised me to use the OEM spec Dexron fluid in a factory, untouched transmission.
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Old 09-27-2020, 12:47 PM   #7
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Is 150 degrees hot on a 100 degree day??


Im pretty sure mine goes to 150 all the time.
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Old 09-27-2020, 06:27 PM   #8
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Quote:
Originally Posted by BlueinTN View Post
Is 150 degrees hot on a 100 degree day??


Im pretty sure mine goes to 150 all the time.
Mine runs about 130 degrees in the Texas heat with the Royal Purple fluid. This is on the street.
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Old Yesterday, 09:15 AM   #9
vtirocz


 
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Quote:
Originally Posted by MatthewAMEL View Post
ATF expands when hot. The removal of 8oz is to compensate for the expansion.


I also ran D4 until speaking with a Tremec rep and him explaining a few things about extending the life of the -6060 when tracking.


I switched to their HP fluid. It's not ATF and doesn't have the same expansion properties. You can fill until full.


As for your scenario, I would not track with a full case. Take some fluid out.
I do find it interesting that other T56 / TR6060 applications call for the trans to be filled up to the bottom of the fill plug (without removing that 8oz). I wonder why they call for less fluid in the Camaro application?

Either way, I followed their recommendation to be safe.
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