The 700r4 is basically a th350 with OD. The 4l80e is basically a th400 with
OD. in fact the rear tailshaft to change from electronic to cable Speedo is
from a th400. Th350 and th400 are two complete different transmissions.
You're close...
The TH-350 was the 2004R's baseline
The TH-400 was the 700R4's baseline
The 4LE80 wasn't based on either one, but was engineered from scratch.
Still two Elkys
5 weeks til East Texas
Red Rocks Country

