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.

Please don’t put replies here unless you have something truly usefull
This section is for technical information

_________________
Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

http://www.youtube.com/watch?v=FKCqfML5V2Y

Instructions;
1. With your engine and trans at operating temp, accelerate at a normal pace from a stop to 60mph on the speedo. It does NOT matter if your speedo is accurate or not, the TCM uses the same speed signal as the ECU/Gauges for shift points.
2. Once you reach 60mph, hold the speed and look at your tachometer.
- If tachometer is at 1700-1800rpm - NOT F37
- If tachometer is at 1900+ - IS F37
This video shows a TCM WITHOUT the F37. 4-5 shift at 0:13 in the video at ~57mph on the speedo.

It does not matter if you start at 0mph, or 35mph. As long as you shift out of 5th gear, and slowly accelerate back up to the 4->5 shift point.

_________________
-Rich
It must be air in the fuel!

My engine cover has a sticker on it from chrysler that says something like "Torque Converter TCM Reprogramed", and also has the date it was performed. I will try and post a pic soon.

_________________
2014 Jeep Cherokee Latitude
V6 4X4

You can also go to JEEP.COM and register you and your Jeep. From there go to recalls and TSB's. If it's been done it will show there.

IF your truck shifts from 4th to 5th AFTER 62 mph your truck HAS THE F37 mod!

PERIOD!

_________________
2005 CRD KJ
GDE engine/trans chips
Provent
Suncoast TC shift kit
40MPG