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Old 09-12-2014, 01:49 PM
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Auto to Manual swap on 2007-2011

I'm considering a swap, primarily to avoid issues with mis-shifts after adding a supercharger. So, I'm curious if anyone has attempted that. How many parts were needed and how expensive.
Clutch and gearbox are obvious, but what about the PCM?

Anything else? Will the position of the t-case and lengths of drive shafts change? Could I avoid hydrolic clutch actuation and use a cable actuation?

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Old 09-12-2014, 06:23 PM   #2
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All of my experience is on other applications, and they vary so what I say may or may not apply.

I would imagine it would be pretty straight forward. You shouldn't need a new ECM either, at least not in my experience. All of the harnesses usually connect right up to the manual and the ECM automatically adjusts. Going from an auto to a manual is much easier than going from a manual to an auto. I would imagine it would go something like this:

Take out center console, unbolt shifter, go under and unbolt the torque converter, then the gearbox and bellhousing. You'll need a new flywheel, clutch and pressure plate, as well as a new pilot bearing.

You'll need the clutch master and slave, as well as the lines. USUALLY, the bolt holes for the pedal and lines are present and just sitting there unused. So it should bolt right up without having to tap new holes.

So put your new pilot bushing/bearing in, then bolt up the flywheel. Stick the clutch and pressure plate on your alignment tool and stick the alignment tool in the pilot hole. Bolt up the pressure plate, then wheel the gearbox over. Make sure the fork, ball, retainer springs and throw out bearing are all installed. Grease up the output shaft, and the pressure plate springs. (don't get any on the friction surfaces.) Pull the alignment pin and put the output shaft through the clutch. You'll have to put a pair of vise grips on the input shaft and wiggle it until the splines on the output shaft line up, then bolt down the bell housing.
Then plug in the flywheel position sensor and then the harness that goes into the torque converter typically connects right into the gearbox sensor which are usually on the top of the box. Bolt up the transmission mount and then bolt up the crossmember and then you can drop the tranny jack.

Then you should be able to bolt the slave up to the bellhousing by the fork output, then run the clutch lines up through the firewall (the space should already be there) then bolt in the master and then the clutch pedal.

It should be as simple as that, give or take a few application specific nuances. Should only take a weekend of 8 hour work.

Oh and you'll need to fill the hydraulic system and the gearbox with the appropriate fluids, but that probably goes without saying.

Edit:
To answer some of your specific questions, no the transfer case shouldn't need altered at all, and the drive shaft shouldn't be any different either.

And you probably could fab up a cable actuator for the fork, but it would probably be 10 times easier to just bolt in the oem hydraulic system since the frame is already probably fitted to accept it.

Most of the time, the auto manufacturers try to make things as identical as possible from model to model to cut down on costs.
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Old 09-12-2014, 07:17 PM   #3
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Anything is possible I guess with enough money but I would say you are better off just selling/trading for a manual JK and going from there unless your current setup has to many mods you cannot part with.
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Old 09-12-2014, 07:48 PM   #4
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I dunno about that, it's hard to make that assumption not knowing what he owes on his current one and how much he would get.

Regardless, you almost always get porked on trades.

You could get everything you needed to do the swap part wise for 2k. Maybe less if you found a used gearbox. And that's with buying brand new fork, ball, TOB, retainers, clutch, flywheel, pressure plate and pilot bearing. Labor wise, free if you did it yourself minus the cost of buying a tranny jack and some tools if you didn't already have them. If you pay someone to do it, I'd imagine that it should only take about 24 hours worth of time. Most shops charge 50-80 bucks an hour so your looking at around 1200-2k for labor. So id say if you paid someone to do it, you could get done for 4k invested easy.

You'd be hard pressed to come out ahead on a trade with that amount.
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Old 09-12-2014, 08:28 PM   #5
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I dunno about that, it's hard to make that assumption not knowing what he owes on his current one and how much he would get.
,,,,,,,,,,,,,,,,,,,
No different than your assumption of it being easy peasy with your cliff notes version of a swap and talking generalities with your admission of not having done an JK swap yourself.

I respect what you said and your general outline of what a "potential" swap "may" entail. I also have done late model vehicle automatic to manual swaps on late model Dodge and Ford trucks and it entailed way more than just slaving in the usual manual parts. In my experience, drive shafts are different, transmission cross brace is different and even the ECM is different for a manual as an automatic ECM is usually tied to a transmission PCM.

Either way, it is a big project and parts costs aside, it depends on how one values their time vs. the pay off when complete or potential disaster of getting something wrong or missed during the conversion and are left with a disabled Jeep and a empty wallet to show for it. Also, never mind the fact that eventually if the OP does decide to trade a conversion or sell it, nobody is going to give full value for the conversion. If anything, most will discount for it as it was not done factory.

Regardless, the OP needs to weigh the pros and cons of either.
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Old 09-12-2014, 08:55 PM
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There's no ECM in a JK with 42RLE, the PCM controls the transmission. I know that I have to re-flash or swap it. I thought I'd just buy a pre-programmed one and chuck it in.

As far as mods go, I have almost nothing: just CB rails and mount, light bar. It's not even lifted. I'm just used to this jeep and I know its maintenance history. I also have the old pre-recall skid plate :-)

Thanks for the cost estimate, however rough.
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Old 09-12-2014, 10:37 PM   #7
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No different than your assumption of it being easy peasy with your cliff notes version of a swap and talking generalities with your admission of not having done an JK swap yourself.

I respect what you said and your general outline of what a "potential" swap "may" entail. I also have done late model vehicle automatic to manual swaps on late model Dodge and Ford trucks and it entailed way more than just slaving in the usual manual parts. In my experience, drive shafts are different, transmission cross brace is different and even the ECM is different for a manual as an automatic ECM is usually tied to a transmission PCM.

Either way, it is a big project and parts costs aside, it depends on how one values their time vs. the pay off when complete or potential disaster of getting something wrong or missed during the conversion and are left with a disabled Jeep and a empty wallet to show for it. Also, never mind the fact that eventually if the OP does decide to trade a conversion or sell it, nobody is going to give full value for the conversion. If anything, most will discount for it as it was not done factory.

Regardless, the OP needs to weigh the pros and cons of either.
I'm not sure why I deserve condescension. I was merely trying to give him an idea of what he would be facing and how much it was going to cost.
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Old 09-12-2014, 10:48 PM   #8
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I say save your wrenching for older stuff that is easier to work in and you are not hurting the resale value. This just sounds like a huge investment of time and money for marginal benefit.
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Old 02-23-2018, 10:20 AM   #9
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old thread, but what was the verdict?

zaitcev, still have your Jeep? Did you do the conversion? I've done this kind of swap on a '96 Ford escort, it was easy as pie. A lot has changed since '96 but aside from the ECM details, I think this should be very feasible. I'm hoping for good news, that you did this and it wasn't all that bad of a job aside from the physical labor! My auto just lost reverse and rather than drop $2500 on a rebuild, I'd rather spend $2500 and end up with the manual.
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Old 03-09-2020, 03:23 PM   #10
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Old thread, curious if anything ever happened

I have the same issues with the supercharger on my 3.8 auto. I am well invested in the jeep and would prefer not to sell/trade in. Was hoping some one out there figured out the amount of effort it would take to make it a manual or a shop that offers such a thing.
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Old 03-11-2020, 07:52 AM   #11
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Do you have to program the new ECM to play well with the rest of the components or do you have to program in the correct VIN? I've watched someone swap ECMs on a RAM and they had to program in the VIN with a big dollar scan tool and use the proper procedure.

I don't know with your 3.8 if you need to do this.

Do what you want....but if this were my project, I'd remove all the mods, sell the Jeep stock, buy a 3.6L and use the supercharger money towards the newer Wrangler, then bolt up what I could of the mods saved....selling whatever is 3.8 specific. The 3.6 is a much better engine.
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Old 03-11-2020, 11:38 AM   #12
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If you had a totaled parts car, it would have everything you need. You might be able to offset the costs by selling seats and axles, etc.

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