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Slipping Rear Band on 4L80E

Home > Discussion Forum > Mechanic's Corner - Transmissions

Email Author email Matt Carnogursky  Reply to Message reply to message  Post New Message post new message      search forums
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Slipping Rear Band on 4L80E Matt Carnogursky 7-21-07  
My 2005 12 pass. Chev Express 3500 (6 liter engine) makes a very audible sort of a dry rubbing/dragging noise when starting from standstill, until the transmission shifts into the second. The same noise is present in the reverse. The noise level is load-dependent, therefore the mechanics first thought it'd come from the torque converter. However, when I shift the tranny manually into the 2nd gear the noise is gone.

We believe that the rear band is slipping and causing the rubbing/dragging noise. The slippage is load-dependent and therefore has symptoms similar to a slippage in the torque converter - hence the earlier confusion.

Can you offer a good advice before my mechanic rips the transmission apart to change the rear band and its servo?

Thanks,

Matt
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