I just baught this 99 runner with 109k on it and everything was cherry. Just about 1k miles before she sold it she got the tranny service by the dealer.
I'm not sure exactly what service she got but it was the one they recommended her at 100k.

Anyway, now when it shifts from 1st to 2nd under low power it kind of slams into gear. It is a pretty crappy feeling, especially since I had to replace the tranny in two of my previous chevy's and it is hella expensive.

Anyone know why it would be doing this? Is there an additive that I can put in there that will make it stop? I havn't started towing yet but soon this baby will be back and fourth from naples to gainsville twice a month with 5 mx bikes on a trailer behind it and i'm gonna need a reliable tranny!

If anyone has some advice that would be awesome, I won't be able to log on again untill sunday. (P.S. the fluid levels are fine)

 

I would suspect low fluid, did you check it while it's hot & in gear?
If you can get the receipts for the tranny flush, take it back to the dealer and see if they'll look at it under warranty.
Good luck