HIGH MILAGE TRANSMISSION AND T-CASE CONCERNS....

[Tools R Us]

I wouldn't be worried about 220F on the A343, but in my testing have never seen anything close to that. Don't see the need for a gauge, just one more unnecessary leak/failure point.

 

[Tools R Us]

Have installed several crawler gear sets in high mileage rigs (~300K) and other than pulling the VC, haven't seen anything that I would consider replacing or changing. These are often wheeled, 37" tire type rigs, the transfer is solid.

 

[Hornd]

Running the AC increases total load on the engine which then puts more heat into the radiator. At the same time the AC condensor is releasing heat which also flows across the radiator making it more difficult to cool the the water inside. And since your transmission fluid flows through the radiator first it becomes hotter and since the ATF will spend the same amount of time in the air/oil cooler as it always has, the fluid goes back to the trans hotter.

170* ATF is nothing to get excited about. I shut the AC off that day on the Rubicon because I took the rising trans temp as an indication of rising water temp and at that time I did not have a water temp gauge installed yet.

A quick check with my infrared thermometer confirmed that my engine head was 216*. The AC will shut off automatically at 226*.

Good to know it has a cut off built in.

Note: Hold Alt + 248 = °

 

[surfpig]

... 170* ATF is nothing to get excited about. I shut the AC off that day on the Rubicon because I took the rising trans temp as an indication of rising water temp and at that time I did not have a water temp gauge installed yet.

A quick check with my infrared thermometer confirmed that my engine head was 216*. The AC will shut off automatically at 226*.

I did the same thing last year, coolant temp rose to 210 and I shut the AC off. Went right back down to 190.

I wouldn't be worried about 220F on the A343, but in my testing have never seen anything close to that. Don't see the need for a gauge, just one more unnecessary thing to obsess about.

Fixed...

 

[cc93cruiser]

Damn, the temps you guys are putting down here for the a442f a343f transmissions are cool indeed.. I have 08 ram cummins with a 68rfe (6-speed auto), and that crap likes to run hot.. While city driving, it runs between 170-195.. I've seen it run as hot as 230F..... This is some evidence as to why these toyota "cooler temp trannies" last a longer time than must other junk out there.. Heat destroys trannies.. I have personally only had slight problems with the solenoids on the a442f on both my 93's. One was a stupid mistake and ran the transmission 3 qts low and lock up and shift 1 solenoids seized up.. As mentioned before, that was an easy fix.. If you have never dropped your tranny pan in all the time owning the 80, I would do it and rinse the screen/filter with hot water. The 4 magnets on the pan do hold on to some fine shavings..

 

[jaymar]

I did the same thing last year, coolant temp rose to 210 and I shut the AC off. Went right back down to 190.



Fixed...

Happened to me once AC cut out. I switched it off and turned on the heater full blast to help get the (Engine) temp down. That was fun. I'd like to say it happened in Death Valley, But it was actually a Starbucks drive-through with cars ahead and behind.

 

[DirtScaresMe]

Does the "turn on the heater to cool down the engine" thing work on an 80? I had a car with an electric heating element, didn't matter.

I think my old vw bus just wrapped a pipe around the engine.

 

[flintknapper]

Does the "turn on the heater to cool down the engine" thing work on an 80? I had a car with an electric heating element, didn't matter.

I think my old vw bus just wrapped a pipe around the engine.

Yes. But HOW MUCH it will cool it down depends on how hot the engine is. Best to catch it....early!

Turn on both the front and rear heaters, fan on high speed. They basically act just like your radiator, so they augment (not replace) the cooling function of your radiator.

 

[lazy]

I "rebuilt" a tcase this summer. Bearings and seals. A pita IMO. You'll need a press, bearing splitter and welder with some "strange" to tack down some steel to fab up press jigs.

 

[silverhorse]

Doesn't sound like fun!

 

[jaymar]

Does the "turn on the heater to cool down the engine" thing work on an 80? I had a car with an electric heating element, didn't matter.

I think my old vw bus just wrapped a pipe around the engine.

Sucks the hot water out of the engine runs it around the heater system. It helps a bit. Doesn't keep your iPhone from shutting off though.

 

[scrowley]

When I was in my tcase recently it looked brand new. Crazy. 230k. The unit is over built for the application. Just keep changing the oil often if you are worried.

Very few failures on the trannys. Mine shifts like new. Knock on wood. But since there are very few failures there are tons of used units out there for grabs.