Here’s a procedure to determine if your CRD’s TCM has been castrated, violated or otherwise molested by Chrysler’s dreaded F37
But first a little back ground. The diesel Liberty CRD appeared in the North American market in 2005 and 2006 and was a marketing test. The then DC didn’t test them very thoroughly and unsuspecting buyers of them produced prior to 11/05 found out the torque converters shuddered and died very quickly, within a few thousand miles. So in November of 2005 when they were producing the 06 model year they switched torque converters and the carnage was reduced but the shudder remained
Around July of 2006, after production of US spec vehicles had wound down DC introduced the dreaded F37.
What the above means is very few if any US CRD’s came from the factory with F37 preformed
F37 called for replacement of the torque converters on those made prior to 11/05 and possibly, not a sure thing, of replacing the transmission pumps front cover to a upgraded design. And on ALL built prior to 12/06 (still being produced for the non N. American market) that both the ECM and TCM got a flash to increase durability. These flashes changed the shift points among other things.
So “HOW DO I DETERMINE IF MINE HAS HAD F37?”
One simple drive will let you know.
From a near stop accelerate to 60 miles per hour BY THE SPEEDODOMETER and hold it at 60. Your TCM does not care what your GPS reads or the tires you have
Look at your engine RPM’s. They will be around 1700 or 1900.
If your RPM’s are 1700 smile and stay away from any and all jeep dealers as you’ve not been flashed
If your RPM’s are 1900 that means you have had the F37 flash
At this point if you go up to around 62-64 it will shift again and the RPM’s will drop. You can slow back down to just above 59 MPH and you’ll see about 1700. Any slower it will down shift.
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