My trans (4L60E) stays in each gear too long when cold, then when it does shift to the next gear it "hangs" a bit before engaging. The "hang" does not go away when warm.
I am wondering about installing this kit, and changing fluid & filter.
Anybody here ever put one of these in?

I put a B&M Shift Improver Kit in my TH700. The shifts are much firmer; sometimes enough to make the CD changer skip.
It took me a few hours. The hardest part for me was putting the check balls where they belong and keeping them there until I got the valve body back in.
If your tranny is having problems, I think these kits could make it worse over time.

i put a B&M in a trans am a buddy of mine and i built back in high school. it definately made the shift much much firmer

My trans sticks in third gear when cold. The dealership said its normal, so for my standpoint, im not to worried. But, this doesn't sound like what you have

With about 123k on the clock, i bet its time for a rebuild. Its not a strong tranny to begin with, and in a burb doesn't last long. Our 96 we bought used ate one at 60k, and when we sold it with around 100k it was slipping again. My 94 blazer that we tow with occasionally is slipping like yours, and its got 100k on it. My advice is live with it til you have the money to get it rebuilt AND have a shift kit installed. At this point, a shift kit isn't really going to solve anything. A fluid/filter change may help temporarily, but only get it done if you're gonna put off the rebuild for a while. Good luck!

Yeah, doing a fluid/filter change is pretty easy. Maybe 1.5 hours if you take your time. Use good quality Dexron 3 (Castrol's is about $1.50 a quart), and a gm filter, seal & gasket (about $20). Not a bad deal if you have to put off the rebuild.

Hey Magna:

I saw your "Hello" post but didn't have any wisdom to pass on there. Here, I'll tell you what I do fir ny 4l60e tranny. I replace the filter and fluid about every 20,000 miles. I have added tranny conditioner once at around 120,000 miles, this was done only to help the seals in the tranny. On a 94 Grand Am that I have, the conditioner helps the shifting during cold spells here in Phoenix. I haven't had any issues other than a minor leak I can live with (by the time I need to replace the fluid, it needs about 1/2 quart.

Good luck with your "new" burb.

When you engine is cold your tranny will stay in 3rd till the engine warms up to operating temperature. It even says that in the owners manual.