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Unread 10-28-2011, 07:57 PM   #1
johndoe31533
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Turn a TJ into an "old Jeep"

I've been thinking about the complex wiring and emissions on the TJ. Thought about stripping everything out of the jeep (empty tub) then adding a simple wiring harness for a CJ (Painless Wiring). I plan to swap in GM V-8/trans and fab up a flat, CJ style flat dash with aftermarket gauges. I love the idea of a hand full of wires under the hood without any sensors. I figured since everyone selling a CJ wants $10/20K for them I thought it would be cheaper to just turn my TJ into a CJ. Then I'd have a modern coil spring suspension with a simple, easy to fix engine bay. What do you guys think?

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Unread 10-28-2011, 08:04 PM   #2
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what makes you think the TJ has complex wiring and emissions? have you looked under the hood & dash of most modern cars out today? the TJ is a dinosaur by comparison.
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Unread 10-29-2011, 12:05 AM   #3
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Huh???
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Unread 10-29-2011, 12:10 AM   #4
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tjs dont have that much wiring. im wasted right now (just got home from a party) and I coiuld take apart my dash and put it back together
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Unread 10-29-2011, 12:21 AM   #5
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Quote:
Originally Posted by johndoe31533 View Post
I've been thinking about the complex wiring and emissions on the TJ. Thought about stripping everything out of the jeep (empty tub) then adding a simple wiring harness for a CJ (Painless Wiring). I plan to swap in GM V-8/trans and fab up a flat, CJ style flat dash with aftermarket gauges. I love the idea of a hand full of wires under the hood without any sensors. I figured since everyone selling a CJ wants $10/20K for them I thought it would be cheaper to just turn my TJ into a CJ. Then I'd have a modern coil spring suspension with a simple, easy to fix engine bay. What do you guys think?
Give it a few years, and them you'll have an old Jeep.

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Originally Posted by LiveAndLearn View Post
tjs dont have that much wiring. im wasted right now (just got home from a party) and I coiuld take apart my dash and put it back together
DO IT!!
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Unread 10-29-2011, 12:22 AM   #6
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The very small number of sensors a TJ has are all the same ones you'll find in any engine made in the past 40 years.

GM V8 swaps are common, but they're not going to make the vehicle any simpler.
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Unread 10-29-2011, 12:24 AM   #7
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I have to agree with earlier statements Jeeps are simple. If the TJ is not simple enough a carb'd YJ can be had for $2-3k in good condition with some decent mods.

Easy method: 1 Sell TJ, 2 Buy YJ or earlier, 3 drink more beer.
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Unread 10-29-2011, 12:29 AM   #8
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Originally Posted by Marauder_Pilot View Post
The very small number of sensors a TJ has are all the same ones you'll find in any engine made in the past 40 years.
That isn't accurate. A vehicle from the early seventies won't have anything close to what a TJ does.


That said, removing those sensors and systems from the TJ offers few advantages and many disadvantages.
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Unread 10-29-2011, 12:29 AM   #9
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A CJ clip won't just bolt to a TJ tub without some major body work. The angle of the arch of the hood is different, plus the hinges are in different spots.

If you want a CJ with more "modern" technology then buy a YJ. A CJ dash and front clip bolt on, then you still have the better YJ leafs, frame, and drivetrain with a CJ body. The YJ dashes are ugly anyways...

If you want the coils then you could really throw them off by buying a YJ, converting it to a CJ body, and put coil suspension under it. This would be the best of both worlds IMO.
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Unread 10-29-2011, 12:32 AM   #10
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That isn't accurate. A vehicle from the early seventies won't have anything close to what a TJ does.
Like what? Just with respect to engine sensors, not safety-related ones. The only ones that really come to mine are fuel flow and O2 sensors for the fuel injection.
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Unread 10-29-2011, 01:27 AM   #11
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carbed engines don't like steep hills sometimes. Never a problem with fuel injection...
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Unread 10-29-2011, 01:27 AM   #12
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Originally Posted by LiveAndLearn
tjs dont have that much wiring. im wasted right now (just got home from a party) and I coiuld take apart my dash and put it back together
NO DRUNK POSTING!!!!

Seriously though I legit LOLd at your screen name after reading your post.
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Unread 10-29-2011, 01:56 AM   #13
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Quote:
Originally Posted by Marauder_Pilot View Post
Like what? Just with respect to engine sensors, not safety-related ones. The only ones that really come to mine are fuel flow and O2 sensors for the fuel injection.
That's what I mean. All the sensors needed to make a fuel injection system operate (02, TPS, CPS, MAF, etc.).

Quote:
Originally Posted by Sgt_Utz View Post
If you want the coils then you could really throw them off by buying a YJ, converting it to a CJ body, and put coil suspension under it. This would be the best of both worlds IMO.
That's the long term plan for my YJ if I keep it around. Throw on a CJ front clip and only a trained eye can tell the two apart.
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Unread 10-29-2011, 02:10 AM   #14
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Actually, what OP is wanting to do is fairly common among the non street legal group. Other than trying to make a TJ look like a CJ, OP wants to build a street legal? V8 conversion with a custom dash. Normally when this is done, the heater box, AC, and all the creature comforts are removed. If the OP is talking about this, it isn't uncommon at all, at least in my area. Usually, the Jeep would have truck axles under it, but I guess you could use an 8.8 as a rear axle, and keep the D30. Making it street legal in my State isn't a big deal as long as oit has lights, turn signals, horn, etc., etc.,.... HOWEVER, in some States, you will be required to meet emissions stardards for the year of the vehicle, not year of engine. Trying to make a older V8 meet 1997+ standards would not be cheap, if even possible.

How old of a V8 are we talking? Are you wanting to stay with EFI, or do you desire to go back to a Carb?
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Unread 10-30-2011, 11:38 AM   #15
johndoe31533
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I was going to keep it street legal. The V8 was going to get a stand alone fuel injection system like the kits from Howell, F.A.S.T. or Holley with a old school, non-electrical auto trans (TH400/TH700). I want the least amount of wiring and computer's under the hood and dash. A full size, eight lug axle swap is also planned. Maybe a YJ would make a good starting point. After researching I think I'm just going to sell the TJ and find a CJ.
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