Performace TCM for CRD's and 3.7's w/3.06 gears???? - Jeep Garage - Jeep Forum

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Old 02-25-2016, 08:35 PM
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Performace TCM for CRD's and 3.7's w/3.06 gears????

This is some food for thought for you CRD and 3.7 owners with 3.06 differential gears. As some of you know, in addition to my WK I also have an LX (Hemi Magnum) with the NAG1 transmission. With the Diablosport Tuner installed on it, it would work pretty good at WOT but, with my mods. (exactly the same as the WK) it would still be a little "soggy" on the normal light/medium throttle upshifts, and I've been wanting to tighten up the shifts a bit more. With the DS Tuner, it becomes a complete "autostick" transmission, unlike the 545RFE in the 4.7/5.7 Jeeps.

Anyway, yesterday I installed a Mopar Performance TCM in it. The job took about a half hour. In its stock format, it improves the shift schedules, torque management, and line pressure. Today I began the calibration and learn procedures, with the stock tune installed. Let me say there is a tremendous difference already, and it's not completely set up yet.

My point is that, if some of you CRD/3.7 guys, with the 3.06 differential are looking to improve your NAG1, you may want to explore this mod a little. At a minimum, you would possibly need to have some sort of tuner that would allow you to adjust rev. limits, WOT shift points, and it would be handy if it would allow changes to differential ratios.

I have found with mine that, with the stock tune at its 5800 RPM rev. limit (I normally have rev limit set at 6400 RPM and WOT shift points at 6000 RPM), it hits this limit before it reaches the WOT shift point. The only way to override this is in the autostick mode. I am not sure, but I think that, if the Jeep's TCM has the same plug arrangement, I don't see why it wouldn't work on your vehicles. You would have to order the one for the 6.1 SRT LX though, as these are the only ones that have the 3.06 gearing. Something to research and ponder, if you're wanting to improve the operation of your NAG1 transmission.

Here's a little teaser for you: :::MoparMax::: Upgraded Late Model Mopar Performance TCM - 1/7/2013

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Old 02-25-2016, 08:55 PM
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Originally Posted by jeepgcoman View Post
This is some food for thought for you CRD and 3.7 owners with 3.06 differential gears. As some of you know, in addition to my WK I also have an LX (Hemi Magnum) with the NAG1 transmission. With the Diablosport Tuner installed on it, it would work pretty good at WOT but, with my mods. (exactly the same as the WK) it would still be a little "soggy" on the normal light/medium throttle upshifts, and I've been wanting to tighten up the shifts a bit more. With the DS Tuner, it becomes a complete "autostick" transmission, unlike the 545RFE in the 4.7/5.7 Jeeps.

Anyway, yesterday I installed a Mopar Performance TCM in it. The job took about a half hour. In its stock format, it improves the shift schedules, torque management, and line pressure. Today I began the calibration and learn procedures, with the stock tune installed. Let me say there is a tremendous difference already, and it's not completely set up yet.

My point is that, if some of you CRD/3.7 guys, with the 3.06 differential are looking to improve your NAG1, you may want to explore this mod a little. At a minimum, you would possibly need to have some sort of tuner that would allow you to adjust rev. limits, WOT shift points, and it would be handy if it would allow changes to differential ratios.

I have found with mine that, with the stock tune at its 5800 RPM rev. limit (I normally have rev limit set at 6400 RPM and WOT shift points at 6000 RPM), it hits this limit before it reaches the WOT shift point. The only way to override this is in the autostick mode. I am not sure, but I think that, if the Jeep's TCM has the same plug arrangement, I don't see why it wouldn't work on your vehicles. You would have to order the one for the 6.1 SRT LX though, as these are the only ones that have the 3.06 gearing. Something to research and ponder, if you're wanting to improve the operation of your NAG1 transmission.

Here's a little teaser for you: :::MoparMax::: Upgraded Late Model Mopar Performance TCM - 1/7/2013
Well 3.07 gears lol. I can program my stock tcm the way I want
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Old 02-26-2016, 01:10 PM
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Originally Posted by Strongjeff View Post

Well 3.07 gears lol. I can program my stock tcm the way I want
Also the srt jeep came with 3.73 gears so that specific tcm wouldn't work
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