Tail Shaft in transmission? Haynes Manuel no can find what shop talking about

[SubeRider93]

Tail shaft replacement in transmission=something to do with the AWD, Can any one explain. 1993 legacy sedan nonturbo auto. When pulling out slowly and wheels make tight ,sharp turning there is vibrating in the front and now in the rear rt. Vibes almost skip, no squeaking. Just had 4 new tires applied ,brakes checked = rear ones good for another 3-5000mi. Would like to get alignment and am soon. Not really bad there. How often do you really need to get or do you need to get all 4 or will the front do on these models? Was Told the vibe thing wouldn't interfere with wheel alignment. What else would have to do with the AWD that would caouse this vibe sensation? Please respond ASAP low budget but want to be safe for a trip in Aug. 09. Yhanks any feedback welcome. I need to see in my manuel what he is talking about. His words aren't in the manuel. Maybe someone can give me the correct meaning of the words from out of his mouth I can understand.

Edited June 8, 2009 by SubeRider93

[avk]

By "tailshaft", in this case they probably mean the AWD transfer clutch inside the extension housing, sometimes called "tailshaft housing".

What happens is that the transfer clutch begins to bind or shudder.

This clutch is like other clutch packs in your auto transmission but is constantly controlled by TCU through a solenoid which modulates the fluid pressure.

Do a search on "torque bind". Sometimes the problem is cured by adding a friction modifier such as GM LSD additive, or similar generic product.

[mdjdc]

If you searce for torque bind you will find a thread about how this is fixed. It can be done by yourself with little difficulty and very little expense as compared to a replacement. We are talking about the cost of fluid versus the entire labor cost and the new parts. I wouldn't recommend the fluid fix as it will only be short term if at all.

 

Good luck

[porcupine73]