Mercedes OM617 diesel to AW4 Cherokee automatic trans
#11
05-07-2012, 10:32 PM
Diesel Enthusiast
I looked it up for my '88. I can check the latter years tomorrow, I didn't even think to check them. There is an output shaft speed sensor in the aw4 specifically for the tcm. It has nothing to do with the speedometer. I didn't remember it was in there, if I were to have guessed I would have thought it needed the cps.
#12
05-08-2012, 07:34 AM
What year tranny & TCU are you using? I'm pretty sure that varies by year...
IIRC the 90 and earlier (ReNix) system uses the CPS for tach signal, because they have no VSS - the speedo is a mechanical drive off the tail housing of the tranny. The 91-96 ((HO) uses the VSS on the tranny tail housing, and I'm not sure what the 97-01 models use, but unless I'm mistaken they don't have a separate TCU - its functions are incorporated into the main ECU.
IIRC the 90 and earlier (ReNix) system uses the CPS for tach signal, because they have no VSS - the speedo is a mechanical drive off the tail housing of the tranny. The 91-96 ((HO) uses the VSS on the tranny tail housing, and I'm not sure what the 97-01 models use, but unless I'm mistaken they don't have a separate TCU - its functions are incorporated into the main ECU.
... little info that has lead me to this as well.
OM617 is a sweet motor, and the tranny would work great... Just need a lil bit of imagination! Congrats!
Subscribed by the way...
#13
05-08-2012, 11:45 AM
Diesel Fan
Like I said, I was thinking the same thing... I dug a little deeper today and even the latter XJ's had a stand alone TCM/TCU with their own speed sensor inputs right from the transmission as well. In 1998 though, the TCM was also on the CCD bus so doing away with the engine computer on those would cause some issues.
You know who we haven't heard from this week though... jeep-dsl, how'd the trial fit-up go?
Last edited by Throttle Jockey; 05-08-2012 at 11:49 AM.
#14
05-08-2012, 11:19 PM
Diesel Enthusiast
All the detailed info you could want in post #5 here
AW4 manual shift - JeepForum.com
I was close to having it right on which solenoid to power to shift it into each gear, and the TCU being incorporated into the main engine managment computer was in 98 - not 97 like I thought.
And in regards.resonse to the rather negative comments about the AW4 on the Novak site: it may not be up to hard service behind a built V8, but behind the 4.0 L inline six that Jeep mated them up to they are nearly bulletroof. The addition of a small secondary oil cooler makes them even more so. My 96 2-door 4-wheeler started life as a 2WD. I pulled the AW4 & transfer case out of my previous 4-wheeler - a 92 with 225k on the clock - and put them into the 96 to convert it to 4WD two years ago. Its still working just perfectly, and the last 5 or 6 years it has seen a lot of hard off-road miles.
The AW4 should hold up beautifully to the levels of horsepower and torque you can make with an OM617.
AW4 manual shift - JeepForum.com
I was close to having it right on which solenoid to power to shift it into each gear, and the TCU being incorporated into the main engine managment computer was in 98 - not 97 like I thought.
And in regards.resonse to the rather negative comments about the AW4 on the Novak site: it may not be up to hard service behind a built V8, but behind the 4.0 L inline six that Jeep mated them up to they are nearly bulletroof. The addition of a small secondary oil cooler makes them even more so. My 96 2-door 4-wheeler started life as a 2WD. I pulled the AW4 & transfer case out of my previous 4-wheeler - a 92 with 225k on the clock - and put them into the 96 to convert it to 4WD two years ago. Its still working just perfectly, and the last 5 or 6 years it has seen a lot of hard off-road miles.
The AW4 should hold up beautifully to the levels of horsepower and torque you can make with an OM617.
Last edited by CheaperJeeper; 05-08-2012 at 11:34 PM.
#15
05-09-2012, 11:34 AM
Diesel Fan
Several years ago I built a little box with 4 toggle switches to control the shifting in an AW4 we were using an a JeepSpeed rig. That's basically what that was talking about, it enabled us to run in second gear with the tcc locked which really helped with transmission temperatures! The driver later chose to go with one of the commercially available ones that was easier to use and it failed mid-race! It was easier to use than the one I built though. It looks like up until '98 model year though it won't be difficult at all to keep the TCM/TCU for fully automatic operation of the AW4, and that's a good thing!
I still want to hear from jeep-dsl...how's my adapter fitting?
I still want to hear from jeep-dsl...how's my adapter fitting?
Last edited by Throttle Jockey; 05-09-2012 at 11:37 AM.
#16
05-09-2012, 03:01 PM
Diesel Enthusiast
Several years ago I built a little box with 4 toggle switches to control the shifting in an AW4 we were using an a JeepSpeed rig. That's basically what that was talking about, it enabled us to run in second gear with the tcc locked which really helped with transmission temperatures! The driver later chose to go with one of the commercially available ones that was easier to use and it failed mid-race! It was easier to use than the one I built though. It looks like up until '98 model year though it won't be difficult at all to keep the TCM/TCU for fully automatic operation of the AW4, and that's a good thing!
I still want to hear from jeep-dsl...how's my adapter fitting?
I still want to hear from jeep-dsl...how's my adapter fitting?
Shifting the AW4 into reverse is still done by a mechanical linkage, right?
BTW, where is Spokompton?
Last edited by CheaperJeeper; 05-09-2012 at 03:03 PM. Reason: Automerged Doublepost
#17
05-09-2012, 03:29 PM
Diesel Fan
Yep, reverse is mechanical.
*warning: momentary thread derailment*
Spokompton? Well, it's also known as Spokan't by some people, or SpokaVegas. I enjoy Vegas too much to associate it with this place though. If you watch our news or read our paper lately you'll see we have more in common with Compton as of late. I never really like it here anyway and now it's getting worse. We were what? 3rd in the nation per capita for vehicle thefts. Just last week some lady's walking her dog in the morning and gets killed... It's a great place to be "from"...
*back to our regularly scheduled program*
*warning: momentary thread derailment*
Spokompton? Well, it's also known as Spokan't by some people, or SpokaVegas. I enjoy Vegas too much to associate it with this place though. If you watch our news or read our paper lately you'll see we have more in common with Compton as of late. I never really like it here anyway and now it's getting worse. We were what? 3rd in the nation per capita for vehicle thefts. Just last week some lady's walking her dog in the morning and gets killed... It's a great place to be "from"...
*back to our regularly scheduled program*
#18
05-09-2012, 03:33 PM
Diesel Enthusiast
Yep, reverse is mechanical.
*warning: momentary thread derailment*
Spokompton? Well, it's also known as Spokan't by some people, or SpokaVegas. I enjoy Vegas too much to associate it with this place though. If you watch our news or read our paper lately you'll see we have more in common with Compton as of late. I never really like it here anyway and now it's getting worse. We were what? 3rd in the nation per capita for vehicle thefts. Just last week some lady's walking her dog in the morning and gets killed... It's a great place to be "from"...
*back to our regularly scheduled program*
*warning: momentary thread derailment*
Spokompton? Well, it's also known as Spokan't by some people, or SpokaVegas. I enjoy Vegas too much to associate it with this place though. If you watch our news or read our paper lately you'll see we have more in common with Compton as of late. I never really like it here anyway and now it's getting worse. We were what? 3rd in the nation per capita for vehicle thefts. Just last week some lady's walking her dog in the morning and gets killed... It's a great place to be "from"...
*back to our regularly scheduled program*
#19
05-23-2012, 06:49 AM
