AZJim

is there a mod to fix this mess.

If my truck doesn't have a TBV just a block and 2 lines going into the tranny is there a modification that is available to install a TBV? Trans gets very hot whentowing. Any help at is appreciated

So my tranny is messing up during hot days and towing my travel trailer. On cooler days towing the same trailer no problem. It revs and chugs and I have to stop and let it rest for a few minutes and it works. Not all the time but it gets me to my destination. Where the transmission thermal bypass should be is just a block with the lines going into it. No factory installed bypass. What am I missing here? I'm pulling what little hair I have left. There is no markings like "Allison" was able to see a D-13 and thats about it. Can I install a thermal bypass block? The block that is in it is not up and down, it's horizontal. Any help would be reall appreciated.