MN12 D and OD gone

Topic: MN12 D and OD gone (Read 1478 times) previous topic - next topic

MN12 D and OD gone

June 13, 2005, 11:52:37 PM

This is a 94 bird and from what im told,, again "im told" , the codes were pulled on the tranny and none showed up. Im not confident in the users ablity to pull the codes but thats a different story.

Problem......
owner says it will shift from 1st to 2nd then D and OD just slips and the tac verifies it cause its pegging like its in neutral.

mileage is about 80k and the person who pulled the codes thinks its a torque converter problem. He also mentions that its a "two stage" transmission,, what ever that means or bearing it has.

Re: MN12 D and OD gone

Reply #1 – June 14, 2005, 07:22:17 AM

AOD or AODE???(I'm assumin its a E since you mentioned readng codes). There is a clutch in the converter that engages for lockup/OD operation. So yea it could be the converter...

If its a AOD the O/D band is likely shot... Or if there is no 3rd or O/D the inner input could be broken(got the T-shirt on that one) or the direct clutch is toast... Both problems(clutch/band) are fairly common...

Re: MN12 D and OD gone

Reply #2 – June 17, 2005, 09:56:28 PM

happend to me on my transgo shift kit tranz. never tore it apart to see what was wrong but same symtoms. but im almost sure my imput shaft broke bc i heard some kinda noise at 60 mph like a grind and snap. if it is the shaft the whole thing needs to come apart to fix it . not fun.

(more and more i am disliking these aod's or auto trans. in general)

Re: MN12 D and OD gone

Reply #3 – June 19, 2005, 10:59:06 PM

A 94 Bird, if 4.6L, would have the 4R70W AOD-E. It was known to have a weak torque converter.