Auto trans temp.

How they work, how they don't work, and how to fix them

Moderators: Greenleaf, BC847, Richie O

Auto trans temp.

Postby fxr3 » Wed Aug 31, 2016 12:45 am

93 w250 diesel. I moved to AZ awhile back and on 110 degree afternoons trans temp gets upwards to 190. I always take od off, if I feel it is trying to hard up a hill or whatever. Welded female spline on torque broke loose 10,000 miles ago and had trans rebuilt, I think it worked great before that, but that far in, decided to rebuild the whole thing. Is 190 too hot, and how should I properly let it cool? Thanks in advance
fxr3
fuel screw!!!!
 
Posts: 39
Joined: Mon Apr 01, 2013 9:10 pm

Re: Auto trans temp.

Postby fatty » Wed Aug 31, 2016 11:22 am

Is that towing or empty? It's a lot hotter than mine runs but I haven't ever driven in heat like that, maybe 95 at most. I have my probe in the pan and I have seen about 150 after some boosted launches.
91.5 w250
fatty
14mm rotor
 
Posts: 780
Joined: Tue Nov 04, 2008 8:52 pm
Location: Washington

Re: Auto trans temp.

Postby DodgeFreak » Wed Aug 31, 2016 1:39 pm

where is your probe at? If its in the pressure line going to the cooler its not to bad, but if its in the pan its getting pretty warm, are you running your heat exchanger? do you have an external cooler?
92 D350 Cab and Chassis. Auto stock, wiring gremlins. 330k miles
92 W250 Ext cab rotted completely out. Auto, pump maxed, 215 ppump nozzles, Denny T2 pin.
85 D350 single wheel, converted to cummins, getrag, turned up 2 turns and afc screw flush.
User avatar
DodgeFreak
14mm rotor
 
Posts: 1701
Joined: Sat May 15, 2010 8:14 pm
Location: Iowa
Top

Re: Auto trans temp.

Postby fxr3 » Wed Aug 31, 2016 6:41 pm

I was towing light trailer once, and empty once. My truck always has 110gallons in extra tank and everything from bottle jacks to 3/4 drive socket sets in it to smooth out ride. 1500lbs+ before anything else goes in or trailer on.
I only know heat exchangers definition on boat motors, but my trans coolers are in front and another rear left under bed.
On 90 degree days with a/c blowing full blast I never really go above 130-150 degree on trans temp.
Engine temp can run up past that 2/3 mark on those super hot days, but turning the a/c off, or slowing down(I often run at 85mph), or catching a down hill grade cools engine temp almost instantly- and the trans temp goes down after several minutes.
fxr3
fuel screw!!!!
 
Posts: 39
Joined: Mon Apr 01, 2013 9:10 pm
Top

Re: Auto trans temp.

Postby PToombs » Thu Sep 01, 2016 4:38 pm

There is a trans oil to water heat exchanger under the turbo. (if it hasn't been removed) It warms the trans oil faster in the winter and keeps it cooler in the summer. The oil from the trans goes to the heat exchanger, then then front cooler, then (I think) to the rear auxiliary cooler.
pete

Just enough power to break everything behind the crankshaft.
User avatar
PToombs
14mm rotor
 
Posts: 11281
Joined: Sun Jan 07, 2007 6:13 pm
Location: Syracuse NY. Snow central!
Top

Re: Auto trans temp.

Postby fxr3 » Fri Sep 02, 2016 12:48 am

Thanks. Heat exchanger is undoubtedly there, I bought the truck a dozen years ago with 40k on it. And it was truly like new(Had cummins and Dodge in Medford, Or. inspect it ahead of purchase). I had same truck in 2 wheel drive before that since new, and I've missed the nice ride ever since! I think the truck is like its owner- a little uncomfortable at 110+ degrees.
fxr3
fuel screw!!!!
 
Posts: 39
Joined: Mon Apr 01, 2013 9:10 pm
Top


Return to Transmission

Who is online

Users browsing this forum: No registered users and 3 guests