I have several questions for you if possible. Did you have to send back any defective parts that had to be exchanged??? Which parts? Thank You.

I have one in my '70 Challenger. Initial installation was a nightmare. It took several years to get it fully dialed in dialed in.
The third crossmember finally was close. I had to pay shipping to send it back for case mods so it would almost fit the car.
I had to jury rig one of the covers to get it to stop leaking. The pilot bearing kept falling out.

What are your issues?

Pilot bearing on an Automatic ?

I believe that the OP was asking about Keisler's overdrive automatic conversions (4L60 I believe) and the reply is about Keisler's TKO manual 5 speed conversion.

Since Silver States bought Keisler in 2014 I'm not sure what the differences would be.

I got a new auto trans from Keisler near their end. After that my car,a ebody, was destroyed in a fire, unfortunately not insured. A divorce and some health problems have slowed me down. Replacing the car and finally finishing it has been slow. Oh, the trans, I read through different posts (not lately) as I remamber had issues that had to be correcd by Keisler. The torque converter flex plate was missdrilled and the floor shifter detent plate didn't fit. Those are 2 for starters. I wanted to take care of the easy stuff first. Any issues that any member have heard of?
Thanks everybody.......

I looked and looked and I have answered my questions. I went to cuda-challengers.com and found my answers. Thanks to all for reading my post