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This is for any Gurus out there, Is it possible to get my 4L80E to remain locked up while decelerating? If so, How? I have most everything sorted out REALLY well, this is just something I would like to have. I tried changing the normal mode release table to 15 mph @ the 0% TPS cell, that didn't work. Any ideas?
THM400 and 4L80E will not provide engine braking in D or OD range. The design of the trans allows overrun clutches to freewheel even if a lower gear is selected electronically. You must use a manual downshift to provide engine braking. The trans design will mask any TCC application during decel also.