Tranny temp at cruise...sitting at 190 deg

[dgiles]

Have a 2010, 3:55 gears, only 20k miles on it, truck stock except for running a Spartan 210 normal tune which really shouldn't matter. At 70mph on cruise, 25 degF outside temp, no downshifting, torque converter locked, the tranny temps slowly climb over about 40min until it sits at 190 deg. When I pull off the freeway, and the torque converter unlocks, and I drive in town for a few min, it drops pretty quickly to about 170. Temp seems a little high for cruise, doesn't it? It usually ran about mid 170's but now that its in the 190's, I'm a little concerned. I haven't been able to pull anything recently, but before when pulling, I never saw even 210. Could I have a flow issue not allowing cooling?

[ipz2222]

I would suspect a bad temp sending unit in the tra ns.

[dgiles]

A bad temp sensor will read correctly most of the time? Its bang on in the morning and seems to warm up like it should. It's just that it keeps climbing until it hits 190. It does cool back down once you get off the freeway, slow down and the tranny starts shifting a bit.

[Fordtruckfx412]

I got kinda same problem with my 08 6.4 Dually 4.10 gearswith a juice w/attitude and I have it set on extreme (150 hp gets me the best mpg) I drove home at like 60-65 mph to save fuel, while going 60 mph on cruise like I normally do, after about 10 miles my warning went off for trans temp of 181F, I had no load on the engine or tranny. I pulled over and the fluid didn't seem burnt nor did it smell funny but I drove it home, another 10 miles and the temp went back down to around 168-173 like normal. What could have happened?

[Strokin0887]

Mine seems to get a lil high at times also. Just riding around town it usually runs about 165-170 but when i pull my 30 foot gooseneck with a 82 bronco and golfcart on it my temp gets up to 190 pretty quick. I just bought a Mag-Hytec tranny pan it holds 8 quarts more than the stock pan so ill see if that helps when i get it on.

[tbsimmons]

I didnt see too much of a difference unloaded with the Mag-Hytech pan. Loaded it seems to help. I will find out for sure this summer while pulling 7% grade with 18000# in tow.
Overall it is lower. i would say my average unloaded is in the 165 range. But towing it has helped, but wont know for sure till I tow in the summer at 105+ degrees.

[blackcloud2k]

On my spartan 250 tune, my trans temps cruising at 75-80 in cruise control will be around 170 deg. Towing it will be around 175 deg. If I start pulling any sort of decent grade unloaded or loaded it will shoot up in the high 180's or low 190's. Do you guys ever watch your tcslip on your dashdaq? I watch mine pretty hard and when she starts getting hot, I notice that the slip is a little more than usually is.

[jjstile]

I've seen mine climb right up to 210 goes up with the coolant temperature. It only ever goes that high when I'm hauling heavy pulling a good grade. 22,000 lbs and the hill is steep enough that I don't feel comfortable pulling it at more than 25-30 mph. The clutch fan comes on and it drops back down to the 180-190 range. Just cruising empty I see temp's up to about 180-190 tops pulling a hill at 75-80mph. Not sure about if this is too hot or not, but I've put almost 10,000 miles on hauling/empty on the hot tune with a blackmaxx+dpf delete.

[johnnyroastbeef]

Originally Posted by tbsimmons

I didnt see too much of a difference unloaded with the Mag-Hytech pan. Loaded it seems to help. I will find out for sure this summer while pulling 7% grade with 18000# in tow.
Overall it is lower. i would say my average unloaded is in the 165 range. But towing it has helped, but wont know for sure till I tow in the summer at 105+ degrees.

did you ever get a chance to tow with the new trans pan and see if your trans temps were cooler? Let me know. thanks.

[tbsimmons]

Last time towing it was 97 degrees.
The tranny temp max was 185 at the top of the hill, pretty long gradual grade (15 Miles I guess) then at the end is a steep one about 2 miles long. Rest of the time it was in the high 170's and low 180's.