Originally Posted by Davidjeff
Not being versed in gm trans as I am a Ford tech dealing with only Powertrains for the last 20 years, your description coupled with your mileage would have me looking at possible excessive clearance or sticking solenoids (shift) for the respective clutch in the downshift you feel the jerk in. If the jerk downshift can be described as harsh and you can feel it running solo (no trailer/load) this would be my first thought. As one has stated it is possible for a u-joint but normaly this will be coupled with driveline vibration either under load or on coast. If you have a carrier brg on a 2 piece driveshaft I would also look closely at the rubber mounting to retainer strap for slack. Not knowing more information and being unable to feel the problem I would suggest duplicating the problem while taking a mechanic on a test drive possibly with the trailer in tow if it is more severe. On the Fords running aftermarket programmers we see excessive Direct clutch wear creating issues on downshift mainly in the torque shifts both 5-6 speed styles. This is normally caused by the programming and the constant shifting they create. I'm not against programmers by any means but it is good knowledge to know.
Thanks. I'm between a rock and a hard place, I have to take camper to the factory from NC for cap replacement. I have been waiting on this for six months.
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