Hello people . I'm new to the forum .
I have just completed a 4.8 truck motor and 4l60e swap into my 1976 chevy van .
Swap went well and runs great .
When i first drove it it felt slow to engage and sluggish . Felt better if i shifted into lower gears so i knew the trans isn't working properly .
My code reader gave me these .....
P0740 Torque converter clutch circuit open .
P0758 shift solenoid B electrical.
P1810 Valve position switch circuit .
P2761 TCC pressure control solenoid control circuit open .

Any help would be greatly appreciated as i don't know where to start . Do i need to order parts ?
Thanks Rob