I got my Flex-a-Lite tranny cooler installed, but am rather unimpressed with the hose, so I'm going to swap it out. Trouble is, I can't be sure of the diameter...any suggestions? The metal barbs are probably pretty forgiving, but I need to get close.

 

What size lines came with it? Pull the cooler and take it with you.

 

Thats the easiest way to do it.

 

Hoses secured with barbs and hose clamps fail so often that they create a hazard that might even be greater than running a transmission with hot ATF...

If you are wanting to increase the reliability of your transmission and extend its life
go get some hydraulic style hoses made with crimped end fittings...don't use unreliable hoses when the consequences can be a $2000 trans rebuild.

 

Thanks HANKL, I didn't know that. I'm going to reevaluate how I permanently secure the system before I buy anything.