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F37, can someone explain it please?
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=30846		 Page 1 of 1
Author:  aslostasyou [ Sun Mar 23, 2008 10:40 pm ]
Post subject:  F37, can someone explain it please?
F37, what is it and how can I confirm if it's been done to my CRD?

I assume the VIN # doesn't mean anything because it could have been flashed for a recall right?

or,

I have an 06 so there wouldn't be a recall right? It was this way from the factory...

If anyone can explain that would be great!

Thank you,
Author:  Magnum [ Sun Mar 23, 2008 10:45 pm ]
Post subject: 
It is a flash on the engine and transmission that no one likes. mine has a sticker under the hood with the f37 flash note, early 06 build
Author:  gmctd [ Sun Mar 23, 2008 11:40 pm ]
Post subject: 
The torque convertor in the KJ CRD and the Hemi, and all vehicles with the 545RFE 5sp automatic trans, has a plastic stator, the part that multiplies torque up to 241% - jackrabbit starts and towing heavy loads has resulted in that part shattering, with much warranty recall for broke vehicles - DCJ response was not to upgrade the t\c, but to downgrade engine output, even moreso than it was originally - F37 is the Jeep magic Flash number - your '06 likely came from the factory already detuned (very early incept dates may have slipped thru), but you also have the improved pump, so you lose some, win some

More info here:
http://www.lostjeeps.com/forum/phpBB3/vie ... php?t=8517
Author:  Joe Romas [ Mon Mar 24, 2008 8:26 am ]
Post subject: 
gmctd wrote:
F37 is the Jeep magic Flash number - your '06 likely came from the factory already detuned (very early incept dates may have slipped thru), but you also have the improved pump, so you lose some, win some

More info here:
http://www.lostjeeps.com/forum/phpBB3/vie ... php?t=8517


In that thread alljeep states and gives pictures stating this was a 07 model year running change so no 06 model years would have come from the factory with the new pump :shock: So it's a lose some, lose some thing :(
Author:  aslostasyou [ Mon Mar 24, 2008 11:25 am ]
Post subject: 
Ahhh... Ok I gotcha.

So the solution to get maximum power the ground is to buy an upgrade torque convertor and find a pre-F37 ECU? Can you not simply reflash the ECU with the old code?

What's the new pump? Are you refering to the lifter pump?

Thank you,
Author:  Cowcatcher [ Mon Mar 24, 2008 11:36 am ]
Post subject: 
The '06 started build in Oct or Nov of '05 and the F37 became a factory program sometime in the late winter/early spring of '06....mid February I think. Most of the field F37's were not limited to the re-program but also involved and updated TC and sometimes a new pump.
Author:  gmctd [ Mon Mar 24, 2008 12:45 pm ]
Post subject: 
Ok, my bad - I'm not too good with numbers'n'dates'n'stuff

The 545RFE trans has a separate large diameter shield covering the pump - early pumps had an extended hub for that cover to seal to, with the tc seal internal to the hub - thus the trans required three front seals: cover od seal, id seal, and the tc seal - much leakage, much hassle - the pump was revised to remove the hub, the cover was revised to take the tc seal, resulting in only two required seals, both in the cover - other than that, no difference in pump functionality - if the tc failed, the pump was usually upgraded - F31\F37 could also get the new pump as part of that reflash upgrade, depending on customer complaint, but not always - would need to see the warranty work sheet or pull the trans to verify the pump upgrade - if original oem, a hacksaw and a new cover and a new tc and yer good to go.................
Author:  Joe Romas [ Mon Mar 24, 2008 1:21 pm ]
Post subject: 
gmctd wrote:
Ok, my bad - I'm not too good with numbers'n'dates'n'stuff........


No Bad at all :D I've been here since May 06 and have seen all these things "happening" :? It was a long time before the cause of the 55 MPH shudder was determined to be air in the fuel. I experienced the 55 shudder 1/2 a mile after leaving the dealer the day I bought it :cry: It felt like it was running out of fuel to me even then but since torque converters were popping like corn at very low mileages it was blamed on the TCs. Lift pumps were mentioned but it was thought they would belch fuel with them :lol: I found the relay and fuse for a lift pump and reported it here and another traced the wire to the rear seat area. Then you came along and disproved the smoke idea and found the Cummins pump would work. So YOUR GOOD!

We're getting a lot of "Second Generation" buyers that are getting a lot of misinformation of how the CRD has evolved under DC rule and think "they got all the new parts" like the salesman told them instead of more of the same and a detune :roll:
Author:  gmctd [ Mon Mar 24, 2008 3:12 pm ]
Post subject: 
Yep - I was surprised to learn this CRD had no aux lift pump, as I had seen the relay and fuse the first day we got it, when I popped the hood for an indepth inspection - off came the engine cover (with explanation to #2son that manly men don't need no vanity shields on no Diesels!) and up came covers on airbox, electrical box, and covers on all hidey places (we left the ball posts in place, in case the computerized IGN coils assumed autonomy and started randomly arcing, like in Frankenstein's lab - according to theory, the balls should attract the arcs away from the soft fuel lines - anyway, they're good conversation starters) - spent next three weeks assimilating every post in the CRD forums - member names had all blurred together by then, but the facts were clear enuff, and members were struggling valiantly toward resolution - only thing left, now, is TCM and ECM, in that order, and the little mule is healed - imo, of course......................
Author:  Serendipity [ Mon Mar 24, 2008 10:46 pm ]
Post subject: 
Joe Romas wrote:
gmctd wrote:
Ok, my bad - I'm not too good with numbers'n'dates'n'stuff........


No Bad at all :D I've been here since May 06 and have seen all these things "happening" :? It was a long time before the cause of the 55 MPH shudder was determined to be air in the fuel. I experienced the 55 shudder 1/2 a mile after leaving the dealer the day I bought it :cry: It felt like it was running out of fuel to me even then but since torque converters were popping like corn at very low mileages it was blamed on the TCs. Lift pumps were mentioned but it was thought they would belch fuel with them :lol: I found the relay and fuse for a lift pump and reported it here and another traced the wire to the rear seat area. Then you came along and disproved the smoke idea and found the Cummins pump would work. So YOUR GOOD!

We're getting a lot of "Second Generation" buyers that are getting a lot of misinformation of how the CRD has evolved under DC rule and think "they got all the new parts" like the salesman told them instead of more of the same and a detune :roll:


Pretty sure I was the first one to run a lift pump. Fame is fleeting I guess. :cry: :wink:

http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=17573
Author:  gmctd [ Mon Mar 24, 2008 11:56 pm ]
Post subject: 
I think he meant I was the first to research and install a DCJ OEM DODGE\CUMMINS lift pump module, direct replacement for the KJ CRD fuel module, not the first aux lift pump installation - I signed on in SEPT07, and you guys were already trying stuff B4 I got here, so no, no upstaging, here
Author:  Serendipity [ Tue Mar 25, 2008 12:07 am ]
Post subject: 
I'll get over it. :wink: The Cummins lift pump is definitely the cleanest way to add a lift pump. It is on my to do list before next winter. I saw some pressure drop during cold weather. I blame the long suction line that my setup has with the pump in the engine bay. Not the best combination when the viscosity goes up in the cold.

In all seriousness, I think it is great the way ideas grow and evolve here.
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