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Old 02-22-2012, 11:10 PM   #1
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I Need You To Make This Decision For Me!!!!

I havn't had a Jeep in 8 years. Back in the day I had an '87 with a 4.2, 4:88's, stock axles, 2.5" spring over with 36" Boggers. I never had a problem in the woods. I now have a '94 4cyl. auto. I am wondering if I should put some money into it to make a good wheeler. Here are the issues.
-Tub is rusting out
-Frame is pretty rusty, the rear by the shackles has a rust hole about 1"
-4cyl. auto......
That said, I plan to just wheel it. Maybe some trips into town but not a daily driver. The 2.5 has no nuts on the road but I am wondering how it handles the trails. I'm not really into huge mud holes but more hills with a bit of mud. Will this motor do it for now?
Sould I trust the frame? It feels fairly solid except for the rear but I took off about 30 LBS. of rust when I stripped it and undercoated it. Will it handle the flexing. I plan on putting a frame tied cage in it next week so I think that will help.
If I plan to just wheel it should I plan on a motor swap, 4.0L or SBC? Or will the 2.5 do fine for what I do.
1994, 2.5, Auto. 30/35 axles welded, posilok, 4:10, 4" lift,
1" Shackle, 33" BFG MT, 4.0L Throttle Body.
Please give me your ideas.

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Old 02-22-2012, 11:28 PM   #2
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The 2.5 will handle damn near anything you throw at it. I have a '91 and the frame is rusting in the exact same spot about the same maybe a little more rust on mine. It's held up fine though. I am going to fix it ASAP and I suggest you do too. Just because its was fine yesterday doesn't mean it will be today. As for the tub rust I would weld a patch in behind it to keep your feet dry..ish. Take the money for the engine swap and use that for a d44 or ford 8.8 because im sure as you know the d35 is a weak axle. Good luck

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Old 02-22-2012, 11:30 PM   #3
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i'm a speed freak so i vote sbc v/8. your axles are gonna hate you for it though. i have a '92 with a 2.5L five speed and i haaaaate that motor. 5.9L magnum in my future with d44 front and d60 rear swap. most of my weight i carry in my right foot and it gets angry a lot hahahahahahahahaha
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Old 02-23-2012, 12:11 AM   #4
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I should have added I had an '87 with a 400 SBC 60's 5:13 2.5" spring over 39.5's. Im not looking to do that with this one. I have a wife and kids now!!!!!!!!!!! I just want to have some fun. Im looking at doing the waggy 44 conv. but the frame and motor bother me
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Old 02-23-2012, 12:47 AM   #5
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the 2.5L is bullet proof and probably has plenty of power for you wanna do since you don't plan on driving on road with it. i'd fix the holes and paint it up. doesn't sound like you're gonna do any extreme wheeling so you should be fine.

keep your rpms up around 3500-4000 for best power
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Old 02-23-2012, 05:58 AM   #6
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I've had good luck with my 2.5. I have a 5spd so... same otherwise. The 2.5 has not let me down at all off or on road. Fix that frame then wheel it!

2.5 liters of fury!
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Old 02-23-2012, 09:24 AM   #7
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drive it till it falls apart then get a real jeep. meaning stick not auto
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Old 02-23-2012, 10:39 AM   #8
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auto

I believe it has the 3.73 gears unless someone has switched them. That being said, you will probably want to use low range on the trail. As long as it is slow, below 30, the low range should be good for high end and give you all the torque you need in the grunt.

You can weld plate over the holes and beef it up, as needed.
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Old 02-23-2012, 12:28 PM   #9
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Quote:
Originally Posted by aalmutawakil View Post
drive it till it falls apart then get a real jeep. meaning stick not auto
Hey now don't be knockin the auto! I love having an auto on the trail because I don't have to worry about rollin back on a hill/ shiftin while going up. i would much rather have a 5 speed when I'm on the road because I think they're fun to drive but on the trail I love havin my auto!
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Old 02-23-2012, 12:44 PM   #10
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Yea I pulled the fuel tank last night. I have a buddy making a plate that wraps the sides and bottom then going to cut the old stuff out and weld this in. I totally agree with bta2011. You can't beat an auto in the woods.
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Old 02-23-2012, 02:02 PM   #11
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keep your rpms up around 3500-4000 for best power
Where's my incorrect answer buzzer?

The 2.5L makes a LOT of torque around 1500rpms, I cruise through all of the trails around here at that RPM. 3500-4000rpms is running it near its redline (5200rpm). Makes max torque at 3200rpms. Anything over that and you're just dumping gas out your tank on the trails.
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Old 02-23-2012, 03:16 PM   #12
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Where's my incorrect answer buzzer?

The 2.5L makes a LOT of torque around 1500rpms, Makes max torque at 3200rpms.

You just contradicted yourself. The 2.5L like other 4 cylinders doesn't have very much torque at lower rpms hence peak torque production between 3000-3500 depending on year and induction setup (ei: carb, TBI, multiport). This engine makes most of its horsepower between 4000-5000 and again depending on year and induction setup peak horsepower will be between 5000-5250. Depending on one's driving style idling around may be fine, there is enough gearing reduction to tackle a lot of obstacles. For harder obstacles and especially for mud (if that's your thing) you need rpms.
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Old 02-23-2012, 03:23 PM   #13
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i agree with the pro automatic tranny argument. i personally prefer 5 speeds, but automatics are great for helping hold the vehicle on hills. theyre also especially good in mud as you can get a near instantaneous shift to keep your momentum.
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Old 02-23-2012, 05:30 PM   #14
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Old 02-23-2012, 10:58 PM   #15
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You just contradicted yourself. The 2.5L like other 4 cylinders doesn't have very much torque at lower rpms hence peak torque production between 3000-3500 depending on year and induction setup (ei: carb, TBI, multiport). This engine makes most of its horsepower between 4000-5000 and again depending on year and induction setup peak horsepower will be between 5000-5250. Depending on one's driving style idling around may be fine, there is enough gearing reduction to tackle a lot of obstacles. For harder obstacles and especially for mud (if that's your thing) you need rpms.
I haven't contradicted myself. It has a lot of torque down low (sub 2000rpm), and of course it makes it's max torque (128ft lbs ish) at 3200rpm. They cruise through the trails just fine at 1500rpm or less, like I often do.

Peak HP for the 2.5L is 117hp for TBI and 120hp for MPFI at 4200rpm, over that and it goes downhill.

But I was talking about the trails in low gear- running over 2000rpm isn't fuel efficient, and you might as well shift into the next gear and putt through low in the RPM range. Of course you're going to want to rev it going through mud and such, because that's where you're moving (hopefully in high gear to keep your speed/momentum up). Also, autos don't like it when water gets inside. Plus if you're going to plow through mud, hopefully you're already up to speed, which means you should (hopefully) already be in gear

My buddies like their autos for the trails, but they admit there's something that feels better about a manual going through the mud.
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Old 02-24-2012, 01:49 PM   #16
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