Joe Romas wrote:
RFCRD wrote:
This is not my analysis of the problem. Just repeating what I was told, straight from the DC Technical Product Support Rep. This tranny has a general fluid flow issue related to tilting it forward. I was just as suprised to hear of such a design flaw, especially from someone inside DC (and given my propensity to sue them at the time).
OK so when your getting up to speed on the freeway and let up when at 55 would enough fluid go to the front of the pan to cause the "bucking" thing
Also if the pump is starved for fluid that would explaine why they wear out and cause the TC to take a dump
Sounds like a new pan and pickup is in order
I don't believe the two issues are related. Bucking/stumbling after acceleration is probably NOT a transmission problem, instead an airflow/CAC boost pressure/fuel control related issue.
Purely speculative, but I believe some of the torque converter/lock-up clutch/pump failures may be related to oil starvation from backing uphill (no different than oil starvation from defective filters). I still beleive mine was underfilled from the factory, aggrevating the problem. This would explain why the problem is not as noticable after the filters were changed.
I have also worked around enough heavy vehicles to know better than force this thing to move when the tranny is not responding. In fact, Allison uses a pressure switch to disable/block the throttle until there is safe oil pressures in the reverse clutches. Put one in a bus, you have to make it driver-proof.