If that's right, then I very much suspect that your Schumaker has the wet driveshafts, in which case there's no way, no way in the world, that it's a straight swap for the Sporting box.
AFAIK, there are two, and only two, gearbox types for the 1100 Sei. There's the Sporting box, which has dry (grease filled) driveshafts, and the type in which the lobes for CV joint tripods engage directly with the diff housing and are lubed by gearbox oil (wet driveshafts).
The first are very similar to the Cinq Sporting boxes. You can distinguish them most easily by peeking under the passenger side looking along the driveshaft. On the Sporting types, the driveshaft enters the differential housing through an oil seal which is part of an alloy bracket held on by 4 bolts. On these, you can actually see the shaft pass through the oil seal and the CV joints are distinct
and discreet units -- take the driveshaft off and you have two intact and complete CV joints on it, no exposed tripod. On the wet ones, the inboard tripod fits into the differential housing, pull the shaft and the tripods are exposed.
I have two Cinq Sportings (Blue and Yellow) and a Sei MPI S (Orange). Orange came fitted from the factory with a gearbox with the wet driveshafts but -- by a fortuitous mistake -- decided to empty all its gearbox oil through the CV boot and destroy its gearbox. I replaced the lot with a dry Sporting box. Gearbox, driveshafts, cables, modified the starter motor to fit, changed the reversing switch connector. Oh what joy...............:bang:
So, the type with wet driveshafts is very different to the type with dry driveshafts (which I think are preferable anyway).
I'm pretty sure that the Sei Sporting box has a fitting for the reverse inhibitor cable which has some kind of blanking plate over it. I wonder whether that plate is actually a reverse inhibitor inhibitor (so to speak) and could be swapped over from one box to the other?
