KJ79 wrote:
I would be interested to know at what speed the torque converter locks up on the CRD of the various members.
We might see a spread depending on 05 or 06 and after TSB reflash.
I got the mine October, 2006 lock-up is at 50-55 mph at slow accelleration. IMHO this is quite a high speed, would have thought 40-45 would be more appropriate.
When set on 'cruise' at 50 to 55 mph the rpm swings way up and down when the road slightly inclines and declines. Almost sound like the engine is turned on and off. Any opinions to share?
It did this to me too in this speed range, but on relatively steep inclines on cruise control. It is trying to decide between the two overdrive gears. If you accelerate to 60-62 mpg it will lock up in the highest overdrive gear. Then back off with cruise control until about 1700 rpm and it will stay there all day in the highest overdrive. It will go all the way down to just a hare above 1600 rpm in the highest overdrive but it can not hold it there in the hills.
It appears designed to lock up in either overdrive depending on speed because I know it's been locked up in the second highest overdrive at 52mph on level roads. I think it's a really good design now that I've figured out all the sweet spots to run at and how to 'feather' the gas (well really diesel) pedal to get the acceleration and shifts that I want.
Mine is built in June of 2005. See signature for details... I fall into a range for a transmission TSB to replace a possibly faulty transmission oil return filter, but I have had not had any adverse symptons so I'm not taking it in unless something is truely operationally wrong.