TCC locks in 3rd but then unlocks going into 4th only to lock again?

[fst100]

ok so heres my dilemma:
-with shifter in "D" or overdrive and i have my TCC unlock at 43% in 3rd or 4th
-say i go at a steady 20% throttle and TCC locks at 25mph and 4th shifts in at 30mph where the TCC locks at 38mph in 4th
-running 3.73s and a 3200stall with built trans

going from a stop or slow roll and shifting into 3rd at like 21mph i then have the TCC engage but then unlocks upon shifting into 4th gear and it'll lock again when it reaches 38mph.

is this normal? i looked at alot of other's tunes and noticed that a majority of ppl have both 3rd and 4th TCC enage at the same mph, for example 40mph. i never had an issue running this in a fwd 4T65E for the tcc to lock in 3rd and remain locked going into 4th. i can upload a copy of my bin file fwiw.

[03Sierraslt]

Is shift lock enabled?

[fst100]

i'm currently at work and not at my home laptop but i am fairly certain its disabled. would enabling it allow the TCC remain locked shifting into 4th? if so thats good news. i have the TCC unlocking if TPS is above 50% for both 3rd and 4th for the TCC apply table fwiw.

[fst100]

ok, was able to go home for lunch. the TCC shift lock is disabled.

[tashspop]

whats the verdict on this issue? should you have shift lock enabled?

[realcanuk]

With shift lock disabled, the TCC will unlock during shifts.

[fst100]

it didnt do anything for me. when i had the tcc lock in 3rd, it'll still unlock when shifting into 4th then it'll lock again at whatever mph i have tcc lock in 4th. im confused at this point. so what i did was put the tcc lock at 39mph where its already in 4th gear regardless and if i have the gear selector in 3rd it'll also lock at 39mph.