I have a big 3/4 ton Chevy conversion van with the "dreaded" 4L60E and it has about 110k on it. I installed a temp gauge, B&M cast aluminum transmission pan, new filter and flushed with this fluid all at the same time. It appears to have been well maintained by the original owner as there were very little "shavings" on the magnet. I have no point of reference for how temperature was before I did that to it but had driven about 4K or 5K with it the way I bought it. It did shift differently when it was hot vs cold; everything seemed a bit sluggish when it was hot. Afterwards I did notice that the torque converter seemed noticeably more "eager" and shifting was firmed up noticeably. It never really slipped before as far as I could tell but it certainly gave me confidence that it was getting the pressure it needed. It shifts the same cold or hot now. I have about 5k on it with new fluid and parts and the temperature gauge never gets close to the danger zone; it rarely get above 150. I will be using this stuff exclusively.

this fluid makes my transmission shift great,run cooler and the price is resonable compared to other fluids.I drive a ford diesel that takes MERCON ,this fluid is compatible with that.It is not for every car though,so check before you order.

This lube meets all of the requirements for my transfer case. The transfer case runs twenty to thirty degrees cooler than with non synthetics.