Shift improver kits

TF-2 all the way
For me it was mandatory with 3.23s 727 L-60-14 26.99 tall with both the gk243@50 cam and the street hemi cam never should have taken the gk cam out. With 3.23s 1st gear is needed to 55 to 60 plus mph depending on tire height
You want to be able pop in 1st@ 35 mph and punch it or you will be a dog until 55 mph.
You should install the manual low at any rpm its like driving a different car when you have bigger cams and 3.23s
pulling down into 1st and punching it at 40 mph leaves a smile everytime 2nd gear chirp @63 mph on the hi-way :)
3.23s about 10mphx1000 rpm in 1st gear depending on tire height