Overdrive Mystery

bugeye58 · Post by **bugeye58** » 13 Apr 2011, 17:00

I picked up a replacement trans today for my '89 740 Turbo Wagon. It came out of an '89 740 Turbo Sedan, and I watched it being removed.
Here's the mystery part. When I cleaned off the nameplate on the overdrive, it says "J TYPE". But, it doesn't have the speedometer drive of a J Type, it is configured like a P Type.
It's an aluminum case M46, and I didn't think the J types would even mount due to shaft differences. Oh well, I'm using it anyway, I was just wondering if anyone else has seen this.
I'm guessing that is just a case of the wrong ID plate being installed.

Jeff

bugeye58 · Post by **bugeye58** » 15 Apr 2011, 12:26

Nobody has any insight to this? I guess I'll have to visit the dealer and talk to the parts guys. I've got a good relationship with them.

Post by **jimmy57** » 15 Apr 2011, 13:32

There was a J hybrid in that time frame but I didn't think it was used on turbos.

bugeye58 · Post by **bugeye58** » 26 Apr 2011, 01:36

Went to the dealer today, and they weren't much help. The catalogue shows a J-P type for later 740's, but no straight J type.
I'm swapping the trans on Thursday, so I can swap my existing OD with the J type if I have to. It''ll be interesting to see what's in there now.

bugeye58 · Post by **bugeye58** » 05 Jun 2011, 16:30

Just a quick update. I went ahead and installed the junkyard tranny/OD as received. The removed unit is a P type, as expected. No problems with the OD at all, so far.
As for the trans, it's got some synchro issues and some very sloppy internal linkage, but I can deal with it for now. I just wish there was an economical place to get M46 internal parts. Dealer prices are pretty steep.