Originally Posted by Short_box
Can i still run this transmission without the plug my truck doesnt have one. Plus im running a 3000 stall if that matters.
You have a TH350 "C" (lock-up TC) tranny.
If the 3000 stall TC isn't a lock-up model, the tranny will need modified to use the non lock-up TC, IIRC. You might be better off starting off w/a non lock-up TH 350 tranny in the first place but this depends on prices for modding the "C" tranny compared to the cost of a different, good TH350 non "C" core.
A lock-up TC will function not locked up, BUT they slip quite a bit more when not locked up than a non lock-up TC- so heat will be higher, and efficiency lower w/o lock up.
The difference between not
locked up and locked up is several hundred RPM; you feel the lock-up as if the tranny shifted into another gear in actual use- it's that noticeable- at least in my '80 Malibu wagon that has a TH350 C.