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Let me put this topic to rest by stating that I think maybe the ATF level was not higher than it was before after all, it was checked when hot immediately after driving and that may have caused an error, previously it used to be checked when cold and after the truck has been sitting for a while...

My radiator seems to have a leak. Coolant is low. ATF level is high by 2-3 quarts (maybe more). Will get a pressure test kit rented. Just getting started. Working on a 2007 Chevy with 6.0L and 4L80e with deep pan and no aux cooler. Running red ACDelco DexCool in radiator. Switched to...

Let me provide some additional info. The truck has a mechanical Cummins engine with OEM Intercooler/Radiator from a 1997 Dodge RAM and an Allison 1000 transmission from a 2006 Chevy Silverado Duramax. I was able to swap the original Dodge intercooler and radiator in an OEM-like configuration and...

Summary – thinking about using one transmission cooler with ATF sandwiched in between two other transmission coolers full of coolant to create a durable heat exchanger – goal is to prevent blown tank separator walls and fluids mixing. Need to add an oil-to-water heat exchanger for my 2006...

or could just get a case saver and prevent that...

Thank you for all the replies, everybody, I've decided to err on the side of caution and change the fluid again. Transfer cases are expensive and harder to change. Fluid is cheap and easy to replace. Drained it already and picked up a couple fresh bottles of Auto-Trak II from NAPA in a town...

TLDR: was in a rush and used an old gun with 5 year DOT3 residue for Auto-Trak II on NP246 plus 40% of that Auto-Trak was 10 years old – what potential issues could a paranoid person expect – should I replace it or leave it? MORE DETAIL: had a long weekend full of maintenance on my 07 Suburban...