Help! 1993 S10 Blazer 4.3 Vortex. Someone put regular ATF in my tranny. Now it doesn't want to shift into 1st. It barely moves after it warms up, but once I get out of 1st it shifts alright. Is my tranny ruined? What do I need to do? Someone please help. I have had one problem after another with this Blazer and I just want to drive it. By the way it only has 83000 mi. on it. Thank You!

 

I wouldn't drive it until I got all that trans fluid out. Possibly go to get it backflushed so that they pump new fluid in & it goes through the torque converter & replaces all the trans fluid with new. See about a cleaner for the trans like seafoam but I'm not sure if that's safe for a trans. Or undo a trans cooler line & put it in a oil drain pan, set the parking brake & put it in gear. That will spin the torque converter & pump out a lot of fluid BUT DO SO AT YOUR OWN RISK!!! I wouldn't let it pump all the fuild out, I'd pump out a lot, then fill it up with the proper fluid again & repeat.
I had a trans cooler line off my aux. cooler pop off at a stop light, 30 seconds later the blazer barely moved & it had lost over 5 quarts of fluid so keep in mind it pumps out fast. Get a friend to help.

 

lol ^ yep. i overfilled mine one time,popped off a cooler line to drain some out,started up the truck and holy cow will it go! best part is it shot into the fan,which pushed it all inside the engine compartment..

3 hours later i had a shiny clean engine compartment.