My suggestion after a brief dalliance with the V8 tcu (a few of them actually and money wasted, and as you will no doubt have read some are touchy on the kickdown) is to get the Ashcroft kit and fit a V8 torque converter.
The earlier upshifting is nice but the Td5 too slippery torque converter is the major issue in my (not so humble I have an ego) opinion.
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