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Topic: Transmission vibration in 5th gear (Read 365 times) previous topic - next topic

Transmission vibration in 5th gear

I am posting this for a friend.  He has a 96 U295.  As soon as it shifts to 5th gear there is a pretty bad vibration.  If you are getting on the interstate and you are in the throttle you don't feel the vibration as bad as you go thru 5th to 6th gear.  It is more prevalent when driving at a speed where it remains in 5th, but again it seems to start at the point of the shift.  You do feel a lesser amount of it in 6th sometimes.  Also, it is worse sometimes than others.
I am hoping someone may have had this problem or actually worked on Allison transmissions and seen this before.  It may not  be the transmission, but with it happening right at the shift point......
Oh, checked the trans for codes, but it showed no codes.
Thanks
Jerry & Nanci
1999 U270 34'WTFI
2011 Malibu
A smart man knows what to say, a wise man knows when to say it.

Re: Transmission vibration in 5th gear

Reply #1 –
Quote from: Green99 –
I am posting this for a friend.  He has a 96 U295.  As soon as it shifts to 5th gear there is a pretty bad vibration.

Since it's a 96 and a U295, search the forum for P3 carrier bearing as one possibility -

Vibration in rear of coach

Transmission Dampener

solved: rear vibration...Now did the outside rear tires get overloaded?

Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: Transmission vibration in 5th gear

Reply #2 –
I would check he U Joints first, loose or bad wear from lack of lube.

Re: Transmission vibration in 5th gear

Reply #3 –
Does it doing coasting down from high speed in neutral?
1998 U270 34'

Re: Transmission vibration in 5th gear

Reply #4 –
Krush,
Haven't tried putting it in neutral.  I will tell him to try that.
Jerry & Nanci
1999 U270 34'WTFI
2011 Malibu
A smart man knows what to say, a wise man knows when to say it.