I'll bet a dollar you were actually in 4th gear with the torque converter unlocked. The 3-4 shift happens around 35 mph at low pedal position. It's hard to notice because the torque converter just starts slipping more (loss of efficiency) and the engine rpms don't change much.

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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.

Nope, but I like the way you think!
I know it was third. It wont go into 4th untill 50mph and its a VERY
noticable shift. A very big drop in RPM, relatively. In 4th, the slowest I can
go is like 48 mph at around 1550 RPM.

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U.S. Army Retired

[rant]

Don't get me started on the shift from 3rd to 4th gear!!!!!!!! At about 50mph that change jerks the entire car like rabbit da.mn crazy!! All other changes are smooth and nice in a normal acceleration, but 3rd to 4th is such an embarrasment to the principle of an auto tranny.

Oh yeah when doing heavy acceleration from 4th to 5th at about 70mph I get that jerkish reaction too, caused by the tranny unlocking, selecting new gear, locking again.

[/rant]

Btw - I have noticed that sometimes I get lockup in 3rd at 35ish and sometimes I don't. Every day I drive home and up a little incline on a hill we got, and it never locks up in 3rd. My speed is 50ish 300m from the incline but there is a speed sign saying 35 so I drop the speed and the tranny unlocks from 4th and goes into 3rd without ever locking up up the hill. I normally use cruise control so it tries to maintain speed, but that noise from the engine revving and slowing down all the time up the hill is annoying as f...

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L.O.S.T forever!
Silver 2002 Skoda Fabia TDI, 235,000km
Former car: Jeep KJ 2003 CRD

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For what it's worth, I've never had 3rd lock up when overdrive was on. When overdrive is disabled, it will always lock up in 3rd at about 37mph indicated.

- Chris

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Used to own:
2006 CRD Sport
Suncoast TC, Transgo shift kit, Inmotion, ORM, EHM, Magnaflow SS exhaust, Fumoto valve, EVIC added, Hensley TruControl brake controller, Pirelli Scorpion ATR LR-D in spring/summer/fall, FIA winter front and Blizzaks in winter

I will try to switch O/D off briefly to see what's what.

I get lockup in 3rd with O/D if I keep doing about 35-40ish on level ground.

_________________
L.O.S.T forever!
Silver 2002 Skoda Fabia TDI, 235,000km
Former car: Jeep KJ 2003 CRD

DIESEL - saving millions of liters of petrol every day!

I for one thing never had the shudder. But the other day I repleced the shifter for the tras-Go shifters and the 2 and 3 were very good, I use to go from 2 all the way to over drive without going to 3,4 and so on, only one shot. I took my ECM and send it to inmotionusa to increase the power and @#$$ what an issue every time that i am in 50 to 55 if i accelerate to pass some body or floor it I have something like a corrugation or like am going under a methal bridge or when i go off the road and it have those riples to wake you up.

I got in contact with inmotion and they told me that I have to replaced the TC for that to go away, -It was too much power for the tranny_.

Any comments.......



Nescosmo......

longview,

I did not run the experiment for long, I only drove about 4 city miles and 2 highway miles. Initial
driving did not yeild any noticeable differences except where 4th and 5th gears shift. It was so
nice having 4th gear back at 48 mph and 5th gear at 58 mph. It just seems like the more natural
shift points than having to drive clear up to 65 mph to get into 5th.

I will probably run the experiment again over the Chrismtas holidays to see if there will be a improvement
in fuel economy. My wife's 05 CRD is stock (no F37) and she can get 24 mpg in the city with out even
trying. My 06 CRD could do the same but after having the F37 done, it has never been the same. I will
post my results when I get them.

Also, for anyone who cares, I noticed that you can now build the 08 laredo with a diesel but you have to
select the X package.

Nescosmo,

After I had the F37 done to my 06 CRD, I finally got fed up with the jeep and I sent my ECM to inmotion.
I got the stage II tunining. I have noticed that any hard acceleration will cause the transmission (probably
the torque converter) to shudder like you are running over small speed bumps. As long as I go easy, I have
no problems. So yes the torque converter will need to be replaced. I'll be getting a torque converter from
suncoast soon. A few other people here who have had the inmotion tune have replaced their torque converters with
one from suncoast and have not had any problems.

Yeah, that the TC slipping. Mine is doing it too at very low RPM pulling a hill, I tried a trans flush, too late. I not running to the dealer, Suncoast will be the way to go.

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I don't want to start an argument, but there are certainly not two third gears. Probably what you are seeing at 50 mph is the torque converter locking up in 4th. Please remember, torque converter lockup is different that the transmission shifting. To my knowledge the stock shift schedule shifts from third to fourth at 35 mph. Torque converter lockup will not happen in any gear below 1600 rpm. Torque converter lockup will happen in third with OD OFF pressed, fourth and fifth without.

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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.

Lots of questions. So what is the difference driving wise between choosing third gear and just switching OD off? Is 3rd gear with OD off a lower gear? Is it more important to keep the trans from shifting between gears or keeping it out of OD? I plan to tow a 3,500 LB trailer. If I had a 5 speed manual I would choose 4th for most flat driving, shifting down to 3rd for hills. With the CRD it looks like I would choose OD off for most driving and 3rd for hills? And for really big hills(like thee California Grapevine) 2nd?

I tried the suggestion of hitting O/D button when approaching my hill. It worked! The tranny locked up after seconds and it was a breeze to cruise up the hill.

When I switched O/D back on the TC was still locked, and I have experienced before that the TC locks up without O/D on when cruising steadily at 40ish. Not 4th gear, definatly. I can tell by looking at the revs.

On the hill before the rpm would go between 2000 and 2200 with no TC lockup at 35mph. With lockup I am at about 1700-1800.

_________________
L.O.S.T forever!
Silver 2002 Skoda Fabia TDI, 235,000km
Former car: Jeep KJ 2003 CRD

DIESEL - saving millions of liters of petrol every day!

I drive on a 'stop and go' road where the speed limit is 55. I keep the cruise set at 55 and when I have to start up again at a stop lite, press OD OFF. Hit resume at about 30 and wait until 40 for it to lock up. Then press OD OFF again to get overdirve. But the trans stays in third lockup until you get to your set speed then quietly shifts into 4th lockup. Lot less rpm and my guess is less fuel too.

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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.

Well here is what I know about auto trannys.

D = go forward
N = nothing
R = backwards

but please correct me if im wrong

Y ou guys know your stuff on this topic dont ya

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Life changes with kids,make sure it is for the best.

One thing I have learned from this is that the O/D button really can do wonders for you when in the 30-50ish area. I don't know why DC didn't program the TCM to lock up in 3rd when going at that speed. I would so love that, the diesel engine has so much power which goes down when you rev it beyond 2500rpm, which is what happens with an open TC.

Locking the TC would be a really good idea to improve acceleration! Maybe a 0-60 run would be faster with O/D off...

_________________
L.O.S.T forever!
Silver 2002 Skoda Fabia TDI, 235,000km
Former car: Jeep KJ 2003 CRD

DIESEL - saving millions of liters of petrol every day!