| Transmission Problem [message #265113] |
Wed, 29 October 2014 22:47  |
rickmike
Messages: 252
Registered: September 2011
Location: United States
Karma: 0
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Senior Member |
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We got to College Station, TX from Knoxville, TN and a rattly noise from the torque convertor area started.
We got towed to AAMCO and they are going to pull the Trans and see what is making the noise.
Noise when idling in Park, the diminishes in drive. It still goes forward and back just fine. My guess is the flexplate or torque convertor bolts or something inside the torque convertor.
They tore apart the transmission and found that the snap ring that holds the bearing and shaft of the drive sprocket of the big chain in the back had broken and allowed parts to start moving around and hitting things and making the noises.
Any ideas what might cause this snap ring to fail??
Thanks to JimK and JimB for responding to my calls.
Thanks to Manny for advising the guys at AAMCO how to properly rebuild the trans for the GMC.
They got the trans rebuilt and it purrs. Shifts smoother than ever and I had no complaints before.
Have credit card, will travel!!
Rick M.
1974 26' Canyonlands
aka "The General"
Clinton, TN
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| Re: Transmission Problem [message #265116 is a reply to message #265113] |
Wed, 29 October 2014 23:59  |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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If the inner race of the bearing or gears got hot and expanded enough to allow it to move on the shaft when thrust was applied, that could put too much stress on the snap ring. Many snap rings also have a specific side that must be against the gear or bearing, and the assembly manual should indicate whether it is the flat side or the beveled side. Manny would probably know automatically, but I would say the bevel should be toward the gear or bearing so thrust forces could not expand the snap ring out of its groove when they push against it.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Transmission Problem [message #265125 is a reply to message #265113] |
Thu, 30 October 2014 08:14 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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rickmike wrote on Wed, 29 October 2014 23:47<snip>
They tore apart the transmission and found that the snap ring that holds the bearing and shaft of the drive sprocket of the big chain in the back had broken and allowed parts to start moving around and hitting things and making the noises.
Any ideas what might cause this snap ring to fail??
<snip>
Rick M.
Rick,
My transmission suffered the same failure. (Hell of a lot of noise - Isn't It??)
I got it broken down in my barn and was about to just replace the snap ring when I called Manny. I should have called first.
The bearing needs to be a press on the input shaft. If the snap ring broke then it was carrying load when it should not have been. That means wear and time must have let the press off. This can happen anywhere.
Mine escaped through the bearing. I actually found all of the parts.
Fortunately, we have Manny as a resource.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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