Has anybody installed a trans shift kit and are you happy with it and was it worth it?  I am looking at B&M 30262 TH-350 Shift Improvement Kit  it has 2 set-ups, one is heavy duty and the other is street/strip.

  Most Transmission Shops Prefer the Trans Go. However the B&M has the best Instructions. I used a B&M Street Strip in my 80" 350 when it was new and I really liked it. I took it to an old gas station that used to rent out there Lifts and just took normal hand Tools and Oil. Took a couple of Hours and I was good to go.

My personal opinion is the B&M kits are WAAY overpriced/overhyped for the end results obtained. They just don't deliver the performance/durability of other kits.
I use TransGo kits for some applications, such as Police vehicles, and Heavy Dooty trucks that pull 20,000lbs MORE than they're rated for.
My personal favorite for your application is from Superior. Works great, and is somewhat adjustable for shift firmness.
As a second option, if ya really wanna get serious, try This one, also from Superior.(Superior owns the Fairbanks name)
I would stick with the first one for a street driver. The second one is more suited for drag racing...and splitting half-shafts, if the engine has enough poop to do it...

Adams correct( as usual) on staying with the first,heavy duty, improvement kit. It will make a firm jump into the next gear but the street/strip will make it BANG into the next gear with neck snaping shifts. It is good for the strip but can be unpleasent on street.

Well since this is the discussion I replaced my trans with another 350 that had a shift kit installed. It is fine when your eaasy on it but when you get on it you really hear it out of first and second is that normal? (I have never owned a vehicle with a shift kit so this is all new territory for me).

How do you mean" hear it"? custom762008-09-26 19:09:42

Its sortof a loud not grinding but something similar. I only does it on take off and when it goes into second. It sounds like shifting but is louder than the previous trans.

You mean like the tires chirping?
A normal "shift kit" should shift slightly firmer at normal throttle, such as normal driving, but get firmer/quicker as you mash the pedal harder...it should be nice and firm at full throttle.
If you are hearing a noise that wasn't there before, and you're sure it's not just the tires, you may want to check out the mounts...trans, engine, and diff. Any of the mounts, if soft, can cause a driveline mis-alignment, especially under heavy throttle.
You may have a diff mount that is allowing the front of the diff to raise up, and that might cause the driveshaft yoke to hit on the body...just something to check out.

I will jack the car up and do some lookin at the mounts. What is the best way to tell how one needs tto be replaced?