You've probably already gotten this taken care of, but I thought I'd confirm that its definetly worth your time to rebuild the old one.

I'd like to add that I've rebuilt a handful of these with sucsess, but one time, rebuilding it did not solve the problem. Must have been a burnt up voltage regulator.

Even if you don't have success, you can keep the parts you use as spares for future repairs.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride