I just went out to test drive a 2500 with the turbo cummins and the auto
trans. I noticed a vibration out of the transmission when first starting
out from a stop. Is this normal?
I think its the tranny slipping the first gear.... Having had an old 70
challenger with the big trans, slipping the first gear always lead to early
rebuilds of the clutch pack....
Any insight would be appreciated.
Having once owned a '95 CTD that went through transmissions faster than it
did tires...I'd say that it still sounds like Dodge (contrary to what many
claim) still cannot make a reliable tranny with the Cummins.
Yup, that was the one.
Found it buried on the TDR. Gotta do it at idle, about 100 feet each way,
leave it in neutral and torque to spec's. Dealer had already done all the
stuff recommended by DC, such as balancing drive shafts. Went so far as
swapping shafts out of new truck with no drone. No joy. They never heard of
the "loosen" deal but now have used it on a couple of trucks and it cured
the problem. Of course it doesn't get it every time. ymmv
I remember seeing it used on a couple of motorcycles years ago.
Most likely what you felt was driveline shudder. This was a longbed? Some
have had problems with this, requiring a shim above the carrier bearing.
It's a simple fix, and one the service department is (or should be) aware
Try it in reverse. If you feel the same vibration, it's probably not the
transmission, as different clutches are used for 1st (rear clutch) and
reverse (front clutch).
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