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Or you could just swap OD units.
I'm pretty sure that the OD unit will not swap from an '84 to a '90 due to the running changes that were made in the M46 transmission over the years. I just tried swapping Overdrive units between an '83 M46 and an '89 M46 and it was an unsuccessful operation. After having been advised that it should directly swap, I was supprised to find that the '83 had a 19-splined center shaft and the '89 had a 32-splined center shaft (and the shaft diamaters were different too). Needless to say, fitting a 19-spline shaft (the M46) into a hole for 32 splines (the overdrive unit) wasn't going to happen. That project was a headache and a half...
Since the '89 M46 was toast (due to the rocket-launch driving habits of the previous owner), I just reassembled the '83 M46 with it's original overdrive and installed it in the '89 740 Turbo. Granted, the J-Type and P-Type overdrive units are a tiny bit different, but it's only the size of the two pistons in the OD actuator housing. I was assured from several knowledgeable sources that the "weaker brother" would still be more than durable enough to handle the 740 Turbo. Also, if you order the IPD M46 overdrive overhaul kit, you can change between J-Type and P-Type overdrives simply by requesting different pistons (the rest of the overhaul kit is identical for both types of OD, and this is the only difference aside from the name plate).
God bless,
Fitz Fitzgerald.
--
'87 Blue 240 Wagon, 255k miles.
'88 Black 780, PRV-6, 147k miles.
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