Big bad chevy

Every once in a while my transmission will slip on second gear. I can't figure out what it is. All my fluids and oils are good

Mike Sigmond

If you provide a little more info on what Yr, make, model & mileage someone might be able to help you better.

When was the fluid & filter last changed?

Big bad chevy

Sorry lol. Its a 2005 z71 4x4. 130,000 on it. I just put tranny fluid in it and it happened to me again. I replaced the shift cylinoids and changed the tranny fluid a while back. It worked for a while but it started up again. It goes and comes

Big bad chevy

I changed the filter maybe abt 8 months ago.

Big bad chevy

Do think it matters if I have oversized tires on it. There bfg all terrain 33" 10ply

Mike Sigmond

I might, it depends, is it driven hard?

Big bad chevy

No way. I hardly take it mudding. What do ya think?

country_09

The tires will have an effect on the shifting...how long have thy been on there? I rea that a lot of these 4L60e's have shifting sloppiness. Most people install a vette servo and a shift kit then get a custom tune to firm it up and get rid of the lazy shiftin. I have a vette servo and a tune and it shifts perfectly

Mike Sigmond

Maybe try some of that Lucas oil tranny conditioner, mine was getting a little sloppy & shifting early, it seemed to help the responce when shifting. Got to drain a quart out and pour the quart of treatment in. Does your tranny pan have a drain plug? mine does, it lets a few quarts out so when you drop the pan it doesnt spill when you break the seal.


It seems like a solenoid if its slipping when shifting from 1st to 2nd. Maybe a conditioner would help lubricate it, or maybe it needs to be replaced, that I dont know.

Big bad chevy

I think I'll try the Lucas oil tranny conditioner first and if not then the vette servo. Thank y'all for helpin me out