Tow vehicle trans overheating Question
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URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=22182
Printed Date: January-25-2025 at 8:51pm
Topic: Tow vehicle trans overheating Question
Posted By: omegajosh
Subject: Tow vehicle trans overheating Question
Date Posted: June-19-2011 at 6:02pm
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I love my boat. I love my tow vehicle. So far Ive had cooling issues with both. I had to replace the trans in my Nautique 2001 because I neglected to replace the impeller on the water pump. But now Ive got problems in my 91 Suburban. The 4l80e should handle my little boat, but Ive seen 260 degrees a few times on the trans, even after aftermarket coolers and high capacity pans. So I checked the flow to the coolers, and it seems to be reversed? Coming out the bottom line to the trans, from the coolers, when it is supposed to be the other way around?
Anyway, all these stupid problems are keeping me from learning how to ski, because I spend more time under the hood of my boat and truck then in the water. |
Replies:
Posted By: eric lavine
Date Posted: June-20-2011 at 9:54am
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those 4L80's were always prone to valvebody problems, worn bores mean leaking oil. personally i dont think your cooling is reversed, i just dont think you have the volume of oil that you need going to the cooling circuit ------------- "the things you own will start to own you" |
Posted By: 8122pbrainard
Date Posted: June-20-2011 at 11:26am
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I believe I've got the 4L85e in my 6.5 turbo. My uderstanding is it's a slightly modified 4L80e. I have never had any cooling issue's and have 230K on it.
Eric, Do you know what mods were done to the 80 to make it an 85? I know the RPM shift points are lower due to the diesel. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: eric lavine
Date Posted: June-21-2011 at 10:31am
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I try not to dabble in car tranny's anymore, to many problems, ive pretty much got away from them Pete, this stuff is from memory, the 4l80 is a pretty stout tranny and i would be surprised if they did any mods to it.
------------- "the things you own will start to own you" |
Posted By: omegajosh
Date Posted: June-21-2011 at 11:59pm
| I measured the flow, and from what I can tell its about half a gallon in the ten seconds I ran it. I just hooked up the coolers reversed from what I had it, so now it goes through the radiator first, then the aftermarket cooler. I also replaced my el cheapo gauge with a nice B/M gauge, mounted in the pan rather than the test port of the trans. I read a steady 180 degrees for over an hour while towing on flat highway speeds. But, as soon as I hit a good sized climb, in went to about 250. My heart sank. My boat doesnt weigh as much as the ToyHauler Im allowed to borrow. Also, how close should the aftermarket cooler be to the radiator? Ive got about an inch or 2 gap between them. |
Posted By: sweet77
Date Posted: June-22-2011 at 1:39am
maybe it just needs an alignment  my 4l80e has 397,892 miles on it right now. the fluid has never been changed and its hooked to a 350 vortec bthat has only had minor repairs.....alt. battery ,pullys belts water pump...and a intake gasket....(3500) and carries a stahl work body around full of tools. i would suggest going back with all original parts the way it was from the factory..... as pete would say "keep it original".. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5528&sort=&pagenum=1" rel="nofollow - 76 Nautique "If you do what you always did,You'll get what you always got!" "An empty wagon makes t |
Posted By: eric lavine
Date Posted: June-22-2011 at 10:12am
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i think your chasing your tail with the cooler situation, one is sufficient and you added....plenty of cooling capacity, all the whackjob tranny guys always tell me you have to change the valvebody or you will have cooling problems...must be something to it, search some 4L80 trans forums, im sure you will find similar complaints and problems ------------- "the things you own will start to own you" |
Posted By: 8122pbrainard
Date Posted: June-22-2011 at 10:15am
So what's the 4L85? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
eric lavine wrote:Posted By: eric lavine
Date Posted: June-22-2011 at 10:29am
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it went 350 turbo, 400 turbo, 700r4, 4l60e, 4l80e I'll check Pete, im not familier with a 4l85 ------------- "the things you own will start to own you" |
Posted By: malibud
Date Posted: June-22-2011 at 10:51am
| Are they interchangeable ? I have burned up a couple 350 turbos towing.... Now I have 6.5 diesel but is a stick which trans is it ? |