I don't know if it's the converter or the 4th gear servo, or the tuning that's doing it, but when i'm on the freeway going like 65 and give it a little gas to where is downshifts but not all the way to 3rd, it shifts back into 4th and hits pretty hard. Any suggestions?

 

Post your hpt file. May be in the tuning.

 

hope the attachment worked

 

Here is the file I will be using. It works really well on my 4l60e. I pretty much did the same things for the 4l80. Took a while to get the shifts and all for the different gear ratios (thanks excel). Maybe this will help. Wes

 

i'll take a look at it.