Transmission Fluid Change After Flipping the Thermostat

[Byrds8]

I have plans to have a fluid exchange completed on my truck soon. I recently flipped the thermostat. Will this cause any issues with the service? Thank you

Edited July 15, 2021 by Byrds8

[rav3]

If you left everything the same & just flipped the internal parts, there shouldn't be anyway for them to visually know.

[Byrds8]

I know there is no way for them to visually know. I am wondering if the ever how they do the fluid exchange would still work like it would if I never messed with it. Would the truck still pump out the fluid under its own power normally and take in the new etc?

[Grumpy Bear]

Yes, it just will not need to be over 192F to do it, 

[Byrds8]

Thanks GB. Just making sure it didn't some how change the flow of things lol.

[2015 High Miler]

Yes it will be easier for who ever is doing it.  They won’t have to run/drive it to get temps to 192 to have it allow the fluid to move through the lines.  

[Byrds8]

Works for me. Then they don't have to waste my gas lol. Temp was great on the way home yesterday also. Never made it to 160 and it was 93 when I went home. I keep watching it to make sure I didn't put the snap ring in backwards and it shoot out or something lol.

[16LT4]

I flipped mine 1700 miles ago, and last week drove the truck straight through from upstate NY to the Treasure Coast FL, cruise control set to 75 and then 85 towards GA to make up for lost time in SC. Checking temps every few hours showed the temp never exceed 151*F. 

[Byrds8]

Yeah I dont think I have seen anything over that either. This weekend it will be a coolant thermostat change to make the engine run cooler too.

[53boy]

Do you guys have any input on driving in the winter with the pill flipped?

[Grumpy Bear]

52 minutes ago, 53boy said:

Do you guys have any input on driving in the winter with the pill flipped?

 

Been doing it for several years. Northern Illinois. Doesn't run any colder than the pre 2014 6L80E. Lower 100's.

 

 

Can't get to cold. Cooler is a heater too. 

 

Notice this graph was made with both a 170 F and a 180 F water thermostat. If you are using the stock 207F or Caddy 196F units you will run a bit warmer. The Katech 174 would fall between these two thermostats. It will also run warmer if you drive faster than 55 or slower than 48 mph. 

Edited July 20, 2021 by Grumpy Bear

[Grumpy Bear]

 

ATF temp vs speed with 180 F water thermostat

[16LT4]

On 7/20/2021 at 12:32 PM, 16LT4 said:

I flipped mine 1700 miles ago, and last week drove the truck straight through from upstate NY to the Treasure Coast FL, cruise control set to 75 and then 85 towards GA to make up for lost time in SC. Checking temps every few hours showed the temp never exceed 151*F. 

This past week, I towed my light boat 200 miles (including across NYC) and didn’t notice temp exceeding 145*F. Speeds stayed under 70 mph. If anything, flipping the pill seems to result an extra cooling; my 2004 F150 usually ran 165*F. 

[Hogtiming]

I flipped the pill before I did mine then I used the method below. I also went ahead and did the transfer case since it uses the same fluid

 

 

Edited August 5, 2021 by Hogtiming

[Dan411]

I had the same question as i just did mine. Also when you check the fluid on dipstick do you still read the cold and hot the same? Or should you read at the hot even when cold