This is the second time i had to replace them.
Anyone know what the ID of the rubber line is?

Don't know the GM part #, but I've had good luck at my local parts house (Arnold Motor Supply) buying generic transmission cooler hose. I think it is made by Gates. It is specially formulated to handle the heat and pressure and it is pricey, but it holds up fine.

3/8 fuel line from a local hardware store works fine

I bought 3/8 fuel injection hose and it'* lookin pretty good.
Thanks

For regular maintenance I replaced the 2 tranny cooler lines in my '92 with fuel line and within a couple of years one of the 2 hoses ruptured and left me stranded (and could have caught fire!). It was a mess, there was tranny fluid all over the engine compartment. Fortunately, I noticed the smoke before it caused any serious damage.

I replaced mine with high pressure tranny hose. I'll never use fuel line for the tranny cooler lines again.

Mine are deteriorated.. they leak upon initial startup. A small puddle, maybe a tablespoon full. But doesn't leak after that. Weird I know.. I'm just going to get an aftermarket cooler, and replace the lines when I do that.


-justin

on my 90, they just ruptured but they were metal and on the 94 they are doing the same but i am going to replace them again. I just had to replace them when i had my wreck a few months ago but these leak as well.