Auto trans temp.
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 462
From: Southern Utah
Don't be shocked...normal and fairly cool. A general rule was that anything under 200 on a regular basis was considered good. Many older trans ran considerably higher.
A truck made for towing with a big cooler on it can get lower, which is fine.
A truck made for towing with a big cooler on it can get lower, which is fine.
Team Owner
Joined: Sep 2000
Posts: 25,019
Likes: 2,712
From: Far NW 'burbs of Chicago
St. Jude Donor '13
2006 and 2009 Corvettes:
Typically, 160 on the highway but takes a while to get up there.
180-200 in most traffic.
Creeping along for an hour in heavy traffic on a 85' day, 217' max.
Book says redline is 270', let it cool below to 230' if possible.
So, cooler is better but I don't get excited at anything below 230'.
Typically, 160 on the highway but takes a while to get up there.
180-200 in most traffic.
Creeping along for an hour in heavy traffic on a 85' day, 217' max.
Book says redline is 270', let it cool below to 230' if possible.
So, cooler is better but I don't get excited at anything below 230'.
Pro
Joined: Sep 2004
Posts: 624
Likes: 0
From: Bakersfield Ca.
Last summer I saw temps of 250, but then I'm convinced my fluid level was more than two quarts low. When I did a tranny service. I put in almost three quarts more than I took out. Now its running in the 180 range, but then its much cooler now.
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Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 462
From: Southern Utah
A big part of the internal heat in an auto trans is generated by the torque converter and its shearing effect on the fluid. Newer auto trans have a lockup clutch in the converter which minimizes this when it is locked. Slow traffic, stop and go are times when the converter is not locked and is producing maximum heat. Once on the highway and the speed stabilizes, the converter locks and the generated heat goes down alot.
Thread Starter
Drifting
Joined: Dec 2010
Posts: 1,939
Likes: 2
From: Danielsville Georgia
I'm no expert on this subject and never gave it a lot of thought. Even in the few automatic trans vehicles that had any H.P. or I towed heavy with. Until now. My Dodge truck shows trans temp and the Corvette. I have been on truck forums and read info from time to time on trans temps,coolers and where to mount a temp sender for auto trans. temp gauges. My Dodge truck has never gotten over 185 in summer heat towing 4500 lbs. From what all I have ever read I thought over 200 is not a good thing. Yet G.M. obviously has these units cooking! Wonder what a engineers take is on this and why is so hot OK with these auto 6 speeds.
Drifting
Joined: Oct 2006
Posts: 1,608
Likes: 7
From: DELRAY BEACH FLORIDA
St. Jude Donor '10-'13
I just got my A6 rebuilt by Century Transmission and the tranny temps were running between 175 and 217 for about two days until HorsePower Sales added a B&M tranny cooler and it now runs between 146 and 175 on 85-90 degree days. If your worried about tranny temps...just add the tranny cooler..a great insurance investment. If your adding a higher stall converter get the tranny cooler! Hot tranny temps are the main factor for A4 and A6 failures.
Last edited by theofel; Apr 22, 2011 at 09:11 PM.
Racer
Joined: Apr 2011
Posts: 273
Likes: 0
From: Texas Hill Country Texas
Would it be better to do the B&M tranny cooler, or get an all in one unit: http://www.westcoastcorvette.com/p-3...c-non-z51.aspx
Drifting
Joined: Oct 2006
Posts: 1,608
Likes: 7
From: DELRAY BEACH FLORIDA
St. Jude Donor '10-'13
Would it be better to do the B&M tranny cooler, or get an all in one unit: http://www.westcoastcorvette.com/p-3...c-non-z51.aspx
Last edited by theofel; Apr 23, 2011 at 06:38 PM.
Racer
Joined: Apr 2011
Posts: 273
Likes: 0
From: Texas Hill Country Texas
The radiator shown though was supposed to be a tranny cooler and engine cooler, so if I did that why would I add on another tranny cooler? Obviously just doing the tranny cooler is much cheaper and is kind of the way I'm thinking of going right now. $60 vs $1000.... unless there its really worth it. I paid $xxxxxx for my cars...the least I can do is give them what they need.
Drifting
Joined: Oct 2006
Posts: 1,608
Likes: 7
From: DELRAY BEACH FLORIDA
St. Jude Donor '10-'13
The radiator shown though was supposed to be a tranny cooler and engine cooler, so if I did that why would I add on another tranny cooler? Obviously just doing the tranny cooler is much cheaper and is kind of the way I'm thinking of going right now. $60 vs $1000.... unless there its really worth it. I paid $xxxxxx for my cars...the least I can do is give them what they need.