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Old 08-04-2010, 08:15 PM   #31
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I hear you but your axle ratio is already 4.10 and it's pretty close to $1100-1200 to regear to something like 4.56. That ratio not different enough from your existing 4.10 to warrant the $1200 cost unless $$$ is no problem for you.
Good info. I can do the swap myself, and just the parts aren't all that bad, but I might as well wait until I feel like doing the engine conversion (and I might as well do the tranny at that point, which if I'm staying on 31"s will mean a TALLER gears).

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Old 08-04-2010, 08:47 PM   #32
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Supercharger or 150 shot wet nitrous kit.

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Old 08-05-2010, 08:35 AM   #33
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LOl, I should have elobarated a little more... by some cash I meant 2-3 thousand.. might consider the 4k supercharger... But a 20k hemil swap seems a bit outrageouse on an 8k jeep... MY BAD!!!!.. LOL... But that is bas @$$!!!! One of my best friends growing up is a dodge / jeep master mechanic. He could hook me up for probably less than half that but... thats still 8k... He has a buddy at work thats done some mods to his 4.0 and is going to check with him today and see what he thought about what he has done... I will post the info later (good or bad).
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Old 08-05-2010, 08:58 AM   #34
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Supercharge it, I can get you into a half price install that I won at Jeep safari!
↑ $4000
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Old 08-05-2010, 10:24 AM   #35
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We did stroked efi ford small blocks for 3500
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Old 08-06-2010, 03:19 PM   #36
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I can do the install that wont be a problem, I am gulling a grand motor this weekend and switching out the heads to put in a cherokee classic...

I build em big.... What are you running for trannys? Keeping the stock jeep with a plate?
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Old 08-07-2010, 10:58 AM   #37
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Depends on what your goal is....I had a 435 in one but most have a C6. Being in the Jeep parts biz I know how easy the stock stuff blows up so I dont even try it I can get enough out of AX5 to put a C6 together. I'm sure you could always use a ZF if you wanted a stick with OD.
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Old 08-07-2010, 11:40 AM   #38
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My Old 76 that I had about 10 years ago we did the 9 inch swap in the rear and put the 390 in front of my jeep 3 speed. It wasnt bad at all really. Making the motor mounts was probably the toughest part.


But now with all this new stuff I am worried I wont have any guages and ect... I dunno maybe its time to save for a supercharger but at that point it will probably be snapping alxes and tranny's.
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Old 08-07-2010, 02:51 PM   #39
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All gauges will work no problem, just take the senders out of your current block and put them in the new one As far as motor mounts go I can get you pics of the easiest way to make some and use the stands that are already on the frame.
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Old 08-07-2010, 02:55 PM   #40
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Ok, I have a 2010 4dr JK automatic, V6 with 30"x9" tires. I am just begining my mods. I have a Dana 44 rear axle with 3.73 gear ratio. I want to go with 33"x12" tires ... what should the gear ratio be to have the best power configuration ... regardless of cost. What is the optimal setup?
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Old 08-07-2010, 03:41 PM   #41
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With your automatic Echo which is the 4-speed 42RLE transmission, you need to go with a lower ratio than you might be expecting to have recommended to you. Where most situations are appropriate with 4.56 for running 33" tires, your JK needs to be regeared to 4.88 due to its transmission (which is the same transmission my '04 has). 4.56 would be too high of a ratio which would cause your engine to lug on the highway with 4.56.

I am running 35" tires with the same 42RLE transmission and it is lugging with 4.88 gearing that the previous owner installed. My rig would be much better with 5.38.

So for yours, stick with 4.88 and you will be happy with how it runs both on the highway and on the trail with your new 33" tires.
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Old 08-07-2010, 09:27 PM   #42
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Thanks Jerry. Boy, a person can save a lot of money and aggravation by following this forum.
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Old 08-08-2010, 01:18 PM   #43
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Shave the pistons, throw in a mild cam. change out your injectors and add a blower... I was watching Horespower TV and that's what they were saying. Might point out I had no clue what the heck they were saying and also they were saying it about a Camaro. But, I did stay in a Holiday in last night.
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Old 08-08-2010, 01:22 PM   #44
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Shave the pistons, throw in a mild cam. change out your injectors and add a blower... I was watching Horespower TV and that's what they were saying. Might point out I had no clue what the heck they were saying and also they were saying it about a Camaro. But, I did stay in a Holiday Inn last night.
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Old 08-08-2010, 06:37 PM   #45
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Horsepower tv hahaha, biggest waste of 30 minutes on a weekend lol...."This week, we are gonna put a cam and intake on a small block chevy" How many times can they do that in a season?....oh I forgot, we have to put it on the dyno and waste 15 minutes while mike keeps bumping up the timing. I enjoy watching the powerblock for the most part, but that show gets on my nerves everytime.
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Old 08-09-2010, 09:36 AM   #46
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That's some funny stuff. I had a wheel lock up on me (actually a caliper) yesterday.. I guess they don't like all that sand and water from the river. I got it to unstick and brought her home 19 miles through town with out using the brakes. (glad I have a stick) and when I got to about 3 MPH I would use the parking break.. and that was the good part of my day... grease gun blew up on me, missing the one socket I needed the most. 20 minute caliper replace took over 2 hours and then it was getting out the power washer and cleaning up the mess. Glad I read this thread... cheered me up..

OH yeah and that picture right over there <---------------------- is what probably did it... lol
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Old 08-09-2010, 10:36 AM   #47
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That's some funny stuff. I had a wheel lock up on me (actually a caliper) yesterday.. I guess they don't like all that sand and water from the river. I got it to unstick and brought her home 19 miles through town with out using the brakes. (glad I have a stick) and when I got to about 3 MPH I would use the parking break.. and that was the good part of my day... grease gun blew up on me, missing the one socket I needed the most. 20 minute caliper replace took over 2 hours and then it was getting out the power washer and cleaning up the mess. Glad I read this thread... cheered me up..

OH yeah and that picture right over there <---------------------- is what probably did it... lol
Yea we all have those days. Three days on a clutch replacement(it was my first time, popped my cherry all by myself). Damn reverse torx bolts(on top of the NV3550 bell housing), and torque wrenches that literally fall apart. I picked it up and walked to the other side of the jeep, went to put a socket on it and all the internals come falling out. And with my luck one of the springs that make it ratchet ran away so I had to buy a new one. And when you get back from the store it starts pouring.. I don't have a garage.
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Old 08-10-2010, 09:04 AM   #48
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I bet we woudl have a ton of stories if we started this thread... The funny thing is you dont remember the good ones... its the bad ones that stick in your memory
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Old 08-14-2010, 05:12 PM   #49
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What gears ratio I need for 33' tires?
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Old 08-14-2010, 05:34 PM   #50
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What gears ratio I need for 33' tires?
What engine and transmission does your Jeep have?
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Old 08-14-2010, 05:37 PM   #51
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Getting 2011 model not sure about neither of of those
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Old 08-15-2010, 07:24 AM   #52
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I beg to differ... I put that 100HP tuner on my Diesil and it came to life.. Its mean as hell now. I have a couple of years before I start cutting this jeep up too.
Gas burners and Diesels are two completely different animals. I've near tripled my HP & TQ on my Dodge/Cummins. Injectors, Edge Comp box, Twin Turbo, Water/Meth injection, & exhaust. Easy and cheap until you get to the 500HP mark, then you start to pay dearly. On average, 1hp = $100.

Gas burners are over controlled by the ECM/PCM for emissions. That I know of, there is nobody that has the ability to re-map the Chrysler ECM/PCM for larger injectors, let alone getting higher flow injectors for more fuel. Plug and play tuners do a tiny bit, but mostly unnoticeable until you are WOT.

I briefly went down this road for the Wife's jeep. I may still ponder a custom turbo fabrication for 5-10psi of boost during my winter layoff, pending funds and a lot of research, and that is more of a high altitude compensation. Air/Fuel ratio may still be an insurmountable problem.

If I had the $$$, I'd go with a Cummins 4BT conversion, and that is just because I know Diesels and how to tweak them. A 5.9 ISB would be better, and might actually fit, but there is no way I could build the front end up enough to support the weight.

Decide where you want the power and go from there. As suggested, re-gearing is probably the best way to go.
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Old 08-15-2010, 04:11 PM   #53
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I would love to do a diesel swap that would be so cool. I know they had a a liberty and a grand Cherokee that had them but I guess they were gutless as well but like you said its easier to make a diesel jump up in horsepower. just a programer and some exhaust made my 7.3 powerstroke scream
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Old 08-15-2010, 04:29 PM   #54
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I have a 04 Unlimited with 4.0 liter, auto trans 33's, 3.73 gears which kills the OD and it was sugested to me to install 4.10 gears with cold air intake and that would get my power back plus my MPG that currently is 13 MPG.
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Old 08-15-2010, 05:20 PM   #55
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4.10 gears would not be low enough for your Unlimited's 42RLE transmission. For 33" tires, you need 4.88. YES I KNOW that sounds too low for only 33" tires but the 42RLE automatic transmission has such a steep high-ratio'd overdrive gear ratio that it needs that extra low-ratio 4.88 axle ratio to truly compensate for it.

I'm running 4.88 with the same 42RLE transmission with 35" tires and that ratio is not low enough for 35" tires, my Rubicon really needs 5.38 to work well with that transmission and 35" tires, it lugs on the highway. My '04 Rubicon's previous owner, a friend of mine, is who selected the 4.88 and he admits he screwed up and should have gone 5.38.

Install the right ratio, don't waste your $$$ on a cold-air intake which won't help at all.
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Old 08-15-2010, 05:29 PM   #56
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I would love to do a diesel swap that would be so cool. I know they had a a liberty and a grand Cherokee that had them but I guess they were gutless as well but like you said its easier to make a diesel jump up in horsepower. just a programer and some exhaust made my 7.3 powerstroke scream

Found this at daveysjeeps.com under parts specials:

Jeep CRD Diesel engine swap package: 68,000 miles. Runs excellent. Comes with engine wiring, 5 speed auto transmission, computer. $3,200
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Old 08-16-2010, 08:58 AM   #57
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I wonder how they run?? I bet the torque would be pretty good. But I also found this "69$ Jeep Power Chipwww.GForceChips.com 95 Horsepower Increase 7 MPG Boost Easy Install + Money-Back Guarantee" 95 HP and 7mpg... and all you need to put it in is a magic wand!!!!!


This is pretty cool its a 3.9 frito lay truck diesel swap. says he is getting 28mpg

1993 Jeep Wrangler YJ Cummins Diesel - Diesel Trucks - Diesel Power Magazine
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Old 08-16-2010, 10:07 AM   #58
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Pretty scarey install....notice how crooked the motor sits? I'm betting his front end won't last very long considering a 4bt is 780 pounds

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