2nd Gen Non-Engine/Transmission 5-speed temps

[GAmes]

Driving 70 to 75 mph, empty, my trans temp is about 170 when the outside air is in the 90s. I have a set of fast coolers installed. Seems kinda high to me. Is it?

 

[GAmes]

I know I'm not the only one with a temp gauge in a 5-speed. What are your temps running without the fast coolers?

 

[QRTRHRS]

No Fast Coolers and 4:10's, I will see similar temps under those conditions. Other than heavy towing, that's about the only thing that brings the temp up.

 

[kkreigh]

Mine is a six speed so not an exact comparison but here are some temps.
I use the required Texaco mtx fluid. I have had a trans temp gauge on for about 13,000 of my 23,500 miles. I just installed fast coolers recently.
Prior to fast cooler installation 95 * OAT no load 75 mph sustained interstate driving at about 1000 feet above sea level
I consistently saw 175 degree transmission temps. I saw a peak of 195 degree under same conditions with a 13,000 pound load 5th wheel trailer + tractor on a relatively short steep grade on I70.

Post fast cooler installation I have seen consistent 155 degree transmission temps with a peak of 160 degrees. 90 *OAT
no load 75 mph sustained interstate driving as above. I have not yet pulled a load to compare post fast cooler. It appears that the fast coolers are good for 10 to 20 degrees cooler temps at least initially.
I have kept spread sheet records of trips of temperatures of my differentials, transfer case, transmission and oil temps.
Its too long to post but if you want to e-mail me I'll try to send it to you if you like. I have some mountain driving in Wy, CO, SD as well as flat land interstate loaded and unoaded.

 

[Joseph Donnelly]

That temp is OK. I get up to 210 towing 6K pounds. I also have fast coolers.

 

[Doc Tinker]

Those temps sound pretty good to me. I just took a look at a couple of oil manufacturer sites to see what the tempurature range specs are on gear oil and couldn't find the information. Amsoil shows a flash point of 403º on their AGR SAE 75W-90 (GL-2 through GL-5), if that helps ya





Doc

 

[M Barnett]

Running empty with air temp over 100*, mine will run about 170 and go to 180 on a big long hill.

Michael

 

[Rcpilotlv]

I have a sixspeed, my highest temp i have seen with air temp around 105, stop and go and highway driving was 190 unloaded.

no fast coolers.

 

[GAmes]

Thanx......

for the responses. I'll sleep better now.

 

[Deezul1]

Just finished towing my 6000lb TT 3000 miles and trans temps ran 165 in 80deg temps and never over 180 even last sunday when it was 100deg+ and I was running 75mph with the trailer.