That's strange, im having the same problem with my trans, and Fred did mine also. I was waiting for parts from him, but never got them that's been 6 months ago. I have to lift off of it to shift from 2-3, and i know the TV cable is sticking. Good luck, i may have to try something diffrent, let me know how the new vendor works out.
Ran a 7.12 in the 1/8th @ 96mph at 21 psi boost. the Lonnie Diers trans is working excellent so far, give me a few more miles & check back with me

my brother Got a Ckperformance trans the other day & gonna install it anytime now, i think he's gonna be WELL pleased i'll post back later on it.
His was flaring on the 1/2 again, so he got in touch with Chris. Fred did his tranny also. He did very good work on my engine build & trouble shooting these cars is beyond par, even his body work & chasis work looks great from what i've seen , his stock trannys may be ok i dont know, but his performance trannys; hmmmm i'll let you decide. Since all 3 of us were in the same boat.