4L60e HELP
Frankly you simply bought the wrong transmission; take it back (ort sell it) and get the correct one.
As mrvedit says you have the wrong trans best bet take it back and get right one.
Other options = change out pump, input drum, bell and converter, However at that point may as well rebuild the original for the time , effort and money involved,
It is described as "Adapts transmission and torque converter for Gen 3/4 LS engines to Gen I and Gen II-style one-piece rear main seal small blocks."
I don't know if a 300mm converter will then fit with it or not.
It is described as "Adapts transmission and torque converter for Gen 3/4 LS engines to Gen I and Gen II-style one-piece rear main seal small blocks."
I don't know if a 300mm converter will then fit with it or not.










