What have you done to your square lately??

[DoubleDingo]

Yeah, it's not "not" normal, but definitely higher than I'd wanna see. Even in a non-lockup trans. It'll live longer if you put a cooler on it

But, if you don't have a temp gauge, you'd never know and the trans would run decades without issues.

 

[WFarm]

For something like an automatic transmission, where you have fluid doing different things in different locations in the tranny there is really no perfect place to monitor temps. What’s important is to establish a baseline and just watch it for deviations versus a specific number.

This is assuming of course your transmission is healthy to start. Mine certainly seems to be as it works as designed. Shortly after I bought the Blazer I dropped the pan to check the fluid and replace the filter. Fluid was clean and red, no debris in pan. A few thousand miles later I again dropped to pan to remove that leaking kick down cable linkage. Everything looked great so I can conclude, in the absence of anything to the contrary, that the transmission is healthy. Now I’ll just watch for changes.

 

[TotalyHucked]

But, if you don't have a temp gauge, you'd never know and the trans would run decades without issues.

True, but it could also fail and you wouldn't really know if it was because it had been hot forever and a day or something else

 

[TotalyHucked]

For something like an automatic transmission, where you have fluid doing different things in different locations in the tranny there is really no perfect place to monitor temps. What’s important is to establish a baseline and just watch it for deviations versus a specific number.

This is assuming of course your transmission is healthy to start. Mine certainly seems to be as it works as designed. Shortly after I bought the Blazer I dropped the pan to check the fluid and replace the filter. Fluid was clean and red, no debris in pan. A few thousand miles later I again dropped to pan to remove that leaking kick down cable linkage. Everything looked great so I can conclude, in the absence of anything to the contrary, that the transmission is healthy. Now I’ll just watch for changes.

Also true. It's definitely less of a worry in older transmissions, 4L60/4L80 and newer are much more sensitive to temperature

 

[DoubleDingo]

Also true. It's definitely less of a worry in older transmissions, 4L60/4L80 and newer are much more sensitive to temperature

I agree with the newer ones being more sensitive to high temps. I think the AW4 would also fall into that category, albeit a solid transmission. I don't want to hex my ride, but my 1991 Cherokee was 223k on the original drivetrain, and it runs and shifts well for a high mileage rig.