mopar shift kit

IMO it's not worth $1 and I would not use one. I used one once and it caused such severe overlap between gears that it would have quickly ruined the trans if I hadn't taken it out. Get a Trans-go TF-1 or TF-2 if you want a good shift kit that'll not only make your trans shift firmer but last longer

Right from the man that does 727's regularly.
I'd take that advice.