My buddy has a 1990 Dodge 3/4 ton truck with the Cummings diesel. He has develoved an issue with the auto trans. At around 50 mph (about 1300 RPM) in OD the trans hunts like the torque converter is unlocking then locking back and forth every 1-2 seconds. This is a new condition as it previously did not do this. If he speeds up to 55-60 it stops and everything is normal. Any suggestions?
dodge auto tranny question
- Thread starter another Todd
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Oooh - sounds bad. I better take that truck off your buddies hands for him. Hate to see him have any further trouble.
It could be the control solenoid for the lock up converter. But first dopuble check the fluid level and quality. Maybe the pump is producing low pressure due to low fluid level or sheared fluid? This could cause the sensor to be on the verge of the upshift/downshift requirement.
It could be the control solenoid for the lock up converter. But first dopuble check the fluid level and quality. Maybe the pump is producing low pressure due to low fluid level or sheared fluid? This could cause the sensor to be on the verge of the upshift/downshift requirement.
More than a few Dodge Cummins diesel pickups with auto trans have had a failure of the lock up part of the torque converter because of marginal line pressure. It sounds like your buddys pickup may have this problem starting. If I remember right the converter should be locked up fully by 37 - 40 mph.
When this first started, he changed the fluid and filter. rule that out. 1. How do you test the control solenoid? 2. How do you test for low line pressure and what is the cure for that? Thicker oil worth a try? It has been unusually and extremely hot here lately. Over 110 degrees about two weks ago.
Did he have the bands adjusted?
On my later model 2001 DODGE trans (46RE electronic versus that, I believe, 618, but both A727-B based), I have the adjustments made, filter replaced, and [4] quarts of fluid.
I then add the requisite amount of AUTO-RX and drive the prescribed miles (about 1,000 I believe; see site) before flushing the whole system at the cooler lines with 14-qts of SCHAEFFERS 204-ALL TRANS SUPREME.
At 115,000 miles (20m since last service and again due) I have had no recurrence of the poor 2-3 shift I was starting to experience at purchase (85m miles).
My truck is burdened with the V8-318 and high gears [3.55 with 245/70-16 tires]; consensus seems to be that this combo puts more strain on the trans than the V8-360 with it's better torque; or, those 318's with lower 3.91 gears. (Truck is 2WD and weighs 5,400-plus with driver, full fuel and usual stuff in it).
My truck also has the HD/Trailering package with an auxilary fluid-to-air heat exchanger. Well worth installing that and (as I still need to do) a MAGNEFINE inline filter.
Good luck
On my later model 2001 DODGE trans (46RE electronic versus that, I believe, 618, but both A727-B based), I have the adjustments made, filter replaced, and [4] quarts of fluid.
I then add the requisite amount of AUTO-RX and drive the prescribed miles (about 1,000 I believe; see site) before flushing the whole system at the cooler lines with 14-qts of SCHAEFFERS 204-ALL TRANS SUPREME.
At 115,000 miles (20m since last service and again due) I have had no recurrence of the poor 2-3 shift I was starting to experience at purchase (85m miles).
My truck is burdened with the V8-318 and high gears [3.55 with 245/70-16 tires]; consensus seems to be that this combo puts more strain on the trans than the V8-360 with it's better torque; or, those 318's with lower 3.91 gears. (Truck is 2WD and weighs 5,400-plus with driver, full fuel and usual stuff in it).
My truck also has the HD/Trailering package with an auxilary fluid-to-air heat exchanger. Well worth installing that and (as I still need to do) a MAGNEFINE inline filter.
Good luck
Yes bands were adjusted.
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