Ok I tried to use it on tow, shifting was way to hard so bumped it down by 5 each time until I hit -25 and still 3-4 was hitting pretty hard with normal driving I was afraid to get on it to see how it acted so I guess maybe I could use the stock and bump it up a few like 5 would probably be max. I must have a shift kit in this transmission already but if this was a drag car it would have shifted great for that. Thanks for all the help I was terrified to try without asking first and now I know I can’t use it on towing.

I thought I said +5 on shift firmness...

It was far too firm with just level 2 I was afraid to go up anymore because it shifted so hard I thought something was going to break

‘they install a shift kit in the new tranny ?

I guess they must have because i couldn’t take it shifting so hard, it never shifted that hard even after having the old transmission rebuilt and I only drove it home and put it on level 2 and it did great