Hard transmission shifts

[1weasel]

Yesterday, after some Interstate driving, I pulled into town and stopped at a light. When I took off, the shift from first to second was hard. I could tell it slipped quite a bit, then dropped in. It didn't matter how soft I drove, it did the same thing. This morning, on my way to work it was fine. I am thinking it's a heat issue and I am ordering a cooler, but could it be something else too?

[bowtiefreak]

I had that happen when my valve body went

[1weasel]

Another quick question, when putting the cooler on, which is the inlet hose and which is outlet hose going to the transmission?

[bigpapapete]

leave the both lines off ,put the ends in a bottle or something to catch the fluid . the one with the fluid is the outlet from the tranny . also on the coolers the bottom line is the inlet for the cooler. thats the way mine is

[1weasel]

The bottom? I figured that you would want it to flow from top to bottom. I don't know how much difference it makes though.

[1weasel]

Does Dex VI work to fill the cooler and lines with? Or will mixing that with whatever's in there not a good thing?