That's a different monster. That one is an engine calibration issue. I can't condone modifying your emissions system but you could try the ORM if you have access to a really smooth farm lane...

_________________
2005 CRD Limited Flame Red w/ Renegade rock rails & light bar, AirLift 1000. 225/75R16 MT/R's on cheap black steel wheels, dual MOPAR subwoofers, Ipod kit & seat covers, Samco hoses - totaled and gone. 2008 WK Laredo 3.0L diesel - AirLift 1000, wife won't let me mess with it much. 2013 JK Sahara on order.

It has nothing to do with engine "calibration". By doing the ORM it becomes worse because of the increase in power and fuel consumption.

There are two separate issues reported that occur at similar speeds. One is the "bucking" thing which occurs under OD lockup when slowly decelerating or slowly accelerating after a hard acceleration up to ~50-60MPH. This has been atributed to inadecuate fuel supply either from an air leak or from a clogged filter.

The other one is a very pronounced "shudder" which occurs with moderate to hard acceleration between 1600 to 1700 RPM in OD lockup and is one of three things, either clutch slippage, worn out U-joints or binging engine mounts. My vote is for clutch slippage.

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

Lower engine-rpm driveline 'vibration' or more accurately, engine shudder, is acceptable overhead with a Diesel engine - not so noticeable in an 8-cylinder engine, it is more evident in a 6-cyl, and very pronounced in a 4-cyl due to the large angles between power-stroke thrust events: 8cyl = 90* for 4 power thrusts per rev, 6cyl = 120* for 3 per, 4-cyl = 180deg for only 2 thrusts per 360* crankshaft revolution - an automatic trans hides the rotational violence fairly well with the fluid coupling and by keeping the rpms up where the strokes are better averaged per unit of time - would be very noticeable in a clutched manual transmission drivetrain, where the driver may be remiss in shifting to a lower gear to get engine rpms up - me, within self-imposed limits, I enjoy that shudder in my big Dodge\Cummins rig, as indication of the tremendous torque output at low rpm - the VM Motori 2.8L was given twin balance shafts to help hide that (so as to appeal to the girly-man segment), and the TCM won't let the 545RFE stay hooked-up at lower rpms, but it's there, and I enjoy the occasional event when things work together righteously and the mild shudder on acceleration can be felt - 'course, I do have the non-worrisome Suncoast TCC, and maybe the day will come when that 545RFE bad boy can be locked-up in 5th at 30mph for better fuel economy - on that event, it would be a pleasure to downshift to 4th to reduce the shudder somewhat, while still in TCC lockup

Far as determining vibration\shudder source, if vehicle vibrates in 5th but not in 4th, or 5th and 4th but not in 3rd at same mph, then it's engine, with possible probability of oem TCC - if it continues to vibrate in any lower gear, then it's drivetrain, such as u-joints, rubber eng\trans isolator mounts, or rotating component balance, even tires\wheels\rotors, including loose lugnuts - can also be simple as exhaust hanger deterioration, since the KJ has no separate rubber-isolated frame to hang that component assembly from - that wierd-looking chinese finger-torture device in the exhaust pipe adjacent the transmission was designed to reduce engine shudder into the KJ's short-wheelbase exhaust system - remove it during exhaust system 'upgrade', and yer on yer own..............

_________________
'05 CRD Limited
Pricol EGT, Boost
GDE Hot '11; EDGE Trail switched
SEGR; Provent; Magnaflow;
Suncoast T\C, Transgo Tow'n'Go switch;
Cummins LP module, Fleetguard filter, Filterminder
2.5" Daystar f, OME r; Ranchos; K80767's, Al's lifted uppers
Rubicons, 2.55 Goodyears
Four in a row really makes it go

One more reason why we need a TCM re-tune even more than an engine tune.

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

The steady state bucking after a hard acceleration has to do with air flow control in the engine. I tested (was the guinea pig for) the prototype code that fixed it. EGR made it worse. It didn't pass emissions so wasn't released. It can be mitigated but not eliminated with ORM.

_________________
2005 CRD Limited Flame Red w/ Renegade rock rails & light bar, AirLift 1000. 225/75R16 MT/R's on cheap black steel wheels, dual MOPAR subwoofers, Ipod kit & seat covers, Samco hoses - totaled and gone. 2008 WK Laredo 3.0L diesel - AirLift 1000, wife won't let me mess with it much. 2013 JK Sahara on order.

I tested my manual in 4, 5 and 6th gears and no sign of any shudder at any rpm, may help you guyswith the auto's and the shudder problem.

Good luck.

_________________
06 CRD LTD ( Euro )

Pardon my ignorance, but is that a 2.5L or 2.8L?

_________________
2005 CRD Limited Flame Red w/ Renegade rock rails & light bar, AirLift 1000. 225/75R16 MT/R's on cheap black steel wheels, dual MOPAR subwoofers, Ipod kit & seat covers, Samco hoses - totaled and gone. 2008 WK Laredo 3.0L diesel - AirLift 1000, wife won't let me mess with it much. 2013 JK Sahara on order.

2.8L - 06 -6 speed man.

_________________
06 CRD LTD ( Euro )

Yeah, rub it in funny guy.

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

Helps increase the anguish...

_________________
'05 Liberty CRD B100, SEGR - SOLD

'01 Beetle TDi B100, EGR delete
'83 Mercedes 240D B100, no EGR

--- SEGR Builder ---

This is EXACTLY when mine shudders. Doesn't do it in any other gear except 4th and 5th and only one light throttle (not enough to kick down to the next lower gear).

_________________
Chad Hargis
Nashville, TN
2008 Grand Cherokee CRD
2005 Liberty CRD *SOLD*

Your evaluation is needed.

_________________
2006 CRD Sport,
Born on 5-20-2006 @ 7:20pm
Jeep Green, Oil drain valve
Tow Package, Transmission skid plate
EHM2, ORM,
Current mileage 79,000.
Past Jeeps: 63 CJ5,
1994, 1995, 2000 Cherokee,
1995, 1997, 2003 Wrangler

@Mr.mopar64
In summary my crd shudders any time the tc is locked up and a large amount of torque is put to the trans. This can be while gaining mph, loosing mph on an incline or holding mph on a incline. This occurs between 1750 and 1900 rpm AND AND AND from 19-25 psi. In some situations at particular rpm for instance 55 4'th and locked 1800rpm sharp i'm ok at 19-20 psi but guaranteed to be shuddering at 21

My crd is otherwise in perfect condition, it accelerates quickly and functions normally. Drove from San Diego to Las Vegas, never dropped out of top gear.

My crd shudders under the following:

On flat roads;

OD OFF at greater than 40 and less than ~52 mph from 30% to 70% throttle (if 70 would downshift, or loose lock up) While accelerating (gaining mph)

Od ON at greater than 55 mph and less than 60 mph from 30 to 70 % throttle (if 70 would downshift) While gaining MPH

OD ON at greater than 60 mph and less than 65 from 30 to 70% While gaining MPH

ON grades, nearly everything is the same, except;

I do not have to be Gaining MPH i can be loosing mph. I can be maintaing mph.

The % of throttle can vary greatly depending on the grades.
If i really had to put a number on it i would say when it's putting out 70-100 % of it's max output. You can feel when she's giving all she's got, and it's not always when it's "lugging" I can be easily pulling out of the hole and still have the shudder. Shuddering is ALWAYS cured by gaining higher rpm's, for instance never a hint of shudder above 1900 rpm EVER. I also think the grade hunting logic varies the throttle needed to initiate a downshift etc.

SO to summarize, low rpm high psi = shudder.

I know psi is not a good way to measure output because there are alot of variables, but it's the best I have.

_________________
06 CRD Limited. IMII, GDE TCM, Carter transfer pump, Upgraded oem primary, 2 micron secondary, 3 inch mandrel straight pipe.
Transgo shift kit, EHM, fcv butterfly removed, egr plated off. 19 3/8 solid flex fan, no electric fan, 10k lb aux trans cooler.
Frankenlift II, Mopar skids, allj's rails, 235/85 km2 on stock rims

CRDMiller hit the nail on the head.

That's my issue too.

4th gear around 50mph or so and 5th gear around 62mph or so while under load but not enough for a downshift.

Also agree that the engine is not lugging. Plenty of pull there, but the shudder typically causes me to mash the pedal for a downshift which immediately stops the shudder.

_________________
Chad Hargis
Nashville, TN
2008 Grand Cherokee CRD
2005 Liberty CRD *SOLD*

It sure sounds like clutch slippage to me.

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

Mine is a 2006 completely stock except for ehm and orm since early miles (1000) it now has 62000 miles.
You hit it exactly! Mine is the same. But I am not totally convinced its transmission slippage.

_________________
2006 CRD Sport,
Born on 5-20-2006 @ 7:20pm
Jeep Green, Oil drain valve
Tow Package, Transmission skid plate
EHM2, ORM,
Current mileage 79,000.
Past Jeeps: 63 CJ5,
1994, 1995, 2000 Cherokee,
1995, 1997, 2003 Wrangler

Well it has proven not to be U-joints because many of those who have replaced them have had continuing problems. It is not fueling because the problem is not fixed with LP installation. It could possibly be low RPM engine pulsation as mentioned by GM but this is also unlikely seeing as how those members with Manuel transmissions cannot replicate the shudder at the aforementioned RPM's and 4 cylinder pulsation does not typically occur above 1200 RPM. It does not occur above 1900 or so RPM when max power and torque is being developed according to dyno runs. That leaves low line pressure in the tranny at the above mentioned speeds. We know that the 545 RE drops line pressure at low RPMs in order to improve fuel mileage and it would also do the same thing with the Suncoast TC because the TCM programming does not change. The transgo kit jumps the shift pressure up but I do not know if it maintains the line pressure once shifted although I suspect that the TCM would adapt to that as well if it did. I still vote for clutch slippage. Perhaps there are other possibilities for the shudder but I can't think of any. Has anyone come up with other possibilities?

_________________
Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.

here is something i have noticed with my setup...

i wasn't driving with the transgo resistor turned on, i wired it in a switch so i can control it.
the shifting was the same as before the SC and trans go swap, but we have adaptave TCM's

so on day for S&G i drove a few days with the switch on, of course firmer shifting and all that
other common stuff with the resistor, but i noticed when i turned the switch back off the shifting
still remained firm.

now could it be that the TCM relearned from the resistor to keep the line pressure up?

_________________
Trevor

'05 Limited CRD Inferno Red Pearl Coat
Home made provent installed @ 35443, SEGR installed @ 35466, Fumoto valve @ 37500, trans and transfer case skid, In tank pump installed @ 43500, Suncoast TC & Transgo Shift Kit @ 44730, EGT, Boost, Trans temp gauges, Samco hoses, Rebuilt Trans w/ HD454RFE kit @ 56K, Inmotion Stage 2 @ 56K

I don't have the resistor on mine.

I checked, and the dealer tech neglected to install it (that is if I'm looking in the right place).

_________________
Chad Hargis
Nashville, TN
2008 Grand Cherokee CRD
2005 Liberty CRD *SOLD*

Spent the day replacing my ujoints.

Shudder is still there. And now i have slight driveline vibes at around 50 mph.

To be fair i did not have the shaft rebalanced, that said some ugly things happened during the procedure so i'm not exactly happy about the current condition of my shaft. I will be seeking a replacement drive shaft because I am a moron :P.

_________________
06 CRD Limited. IMII, GDE TCM, Carter transfer pump, Upgraded oem primary, 2 micron secondary, 3 inch mandrel straight pipe.
Transgo shift kit, EHM, fcv butterfly removed, egr plated off. 19 3/8 solid flex fan, no electric fan, 10k lb aux trans cooler.
Frankenlift II, Mopar skids, allj's rails, 235/85 km2 on stock rims