C1 OD piston o-ring problem

[Bako_Dmax]

Im replacing the OD o-ring on the C1 apply piston in my transmission. I went down to my local allison dealer and had them order one, the new one does not fit right the width is way to big. When installed the o-ring sticks out like an 1/8 of inch.

Is there different o-rings from between the 5-speed and 6-speeds? Im thinking I got one for a 5-speed or they just stuck the completely wrong o-ring in the package.

Here is the part # of the o-ring they ordered for me: 29536111.

Any help or part number on the o-ring I need would be great.

Thanks.

 

[Bako_Dmax]

Here are some pics. The original O-ring is on the left new one on the right.

This is the serial # for my trans: 6320746546

 

[Mike L.]

The 5 and 6 speed C1 pistons are totaly different. Nothing interchanges between them. have them order another one.

 

[Bako_Dmax]

Mike, do you know if its part # 29536111 or 29542809?

 

[Mike L.]

Mike, do you know if its part # 29536111 or 29542809?

I won't know that till monday.

 

[JakeGMCHD]

The 29536111 is for the 5speed trans.