2005 LR3 with 206K miles. Engine purrs but it is slipping in 2nd gear.

I have a low mileage trans from an 05' with no issues. I was told you can't swap trans as they are mated to the VIN of the vehicle. Apparently the answer is to swap in the solenoid pack?

Does this sound right?

Thanks.

 

You can just swap them is what I have been told. If you put in new megatronics, then it will need to be programmed.

 

The VIN and application specific software is programmed into the Mechatronics.

You "could" swap the Mechatronics from your original if the geartrain/clutches are faulty, but ~80% of 6HP issues are in the Mechatronics. You could end up with the same issue immediately or eventually depending on where the fault is.

You can buy remanufactured Mechatronics directly from ZF that will come pre-programmed by VIN, making it a "direct bolt-in" repair.

I personally haven't seen second gear slip due to an internal fault. Usually its low on fluid or Mechatronics issue. The only clutch I ever see burn up is the "E" clutch which usually effects 4,5 & 6th gear. This is due to the small surface area of the clutch discs (it nests inside of the "B" clutch, it is tiny) and the fact that it relies on a wear prone bushing for apply pressure.

 

Would you suggest a complete fluid change or just a top off?

 

It's alive!

Second gear was slipping and the fault code was something about incorrect 2nd gear ratio.

Took a known working trans, swapped in my megatronics and installed.

Works perfect.

 

cool, definitely would put in new fluid.

 

Yes, in order to swap the megatronics the valve body had to be removed, needless to say the pan came off and the fluid was drained. New fluid and pan/filter.