GXP Transmission Fluid Temps
On The Tree
Joined: Jul 2008
Posts: 158
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From: St louis
No thats not to high i would say thats a little low. Usaully on a long drive on a hot day 90+ mine hovers around 205 -210 i wouldnt worry about that
i think most of us would agree thats a good temp.
i think most of us would agree thats a good temp.
Mine seems to be running hot lately around 200 in 70 degree weather when i was autocrossing i hit 230 before that i had never seen it above 212 hope i didnt bust anything
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so i called gm about operating temp in our transmissions the guy told me normal operating temp is up to 230 he said you should worry if you hit 260 so i think these things can handle a lot of heat
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Teching In
Joined: Mar 2008
Posts: 13
Likes: 0
From: Michigan
I'd have to install a trans cooler to keep it under 185 degrees! I don't know how you drive your 08' GXP, but even when I think I'm babying my 08', my tranny runs about 190 degrees. Consider yourself lucky. I've had mine up to 240 degrees before (using Tapshift and spanking high dollar, foreign cars light after light = FUN!).
TECH Fanatic
Joined: Oct 2003
Posts: 1,101
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I'd have to install a trans cooler to keep it under 185 degrees! I don't know how you drive your 08' GXP, but even when I think I'm babying my 08', my tranny runs about 190 degrees. Consider yourself lucky. I've had mine up to 240 degrees before (using Tapshift and spanking high dollar, foreign cars light after light = FUN!).
probably not what you want to hear but mine seems to run cool like that right before it went to ****.
I had to come out of retirement to 
at that,
Guys anything above 200 is bad news, the highest I'd ever push a stock 4T65E-HD is 185ish before i'd freak out. There is a reason this transmission is under investigation for a recall and heat is it. Its cooled poorly through the radiator stock and if you run stock trans parts on this car sooner or later it will fail. That is documented fact not an opinion.
If you guys want more info read the sticky on the top of this sub forum or go to gmsl4.com, really good conversations about this trans on there.
O.K. back to lurking...
at that,Guys anything above 200 is bad news, the highest I'd ever push a stock 4T65E-HD is 185ish before i'd freak out. There is a reason this transmission is under investigation for a recall and heat is it. Its cooled poorly through the radiator stock and if you run stock trans parts on this car sooner or later it will fail. That is documented fact not an opinion.
If you guys want more info read the sticky on the top of this sub forum or go to gmsl4.com, really good conversations about this trans on there.
O.K. back to lurking...
