I was looking at 1989 option codes on the web and saw three different option codes for the T-5: MB1, MK6, M39, as well as another option, MM5, which does not specify a trans type beyond manual.

Can anyone tell me what this is all about? I expected one code for manual and one for auto.

 

I know at the very least, that there's 6-cyl T-5s, TBI T-5s, and TPI T-5s in that year, with different gear ratios.

I suspect that's at least part of why they're like that..... 3 different part #s on the Bill Of Materials for the transmission in the different cars.

 

My understanding is the MM5 code simply means the car came provisioned for a 5 speed manual transmission. The other codes you should find will tell you what type. My car has the MK6 which translates to Manual 5 speed, Borg Warner, 2.95 1st, O/D.

Chuck

 

Well, it didn't take long to make sense out of this issue. Thanks.

 

There are 2 different transmissions with the 2.95 (V8) 1st gear in that year; the TBI cars came with a .63 OD, and the TPI cars, or at least some of them, came with a .73. 2 different codes for those.

 

Is there any way to tell which one you have or any specifics once the tranny is out, and you dont know what it came from other than a 3rd gen?

thanks

 

http://www.5speeds.com/t5/index.html