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Old 01-14-2014, 08:55 PM
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Off road buggy build

Alright I'm looking for suggestions on my fully custom build here tell me what I'm doing wrong and let me know what type of better ideas y'all got. I was thinking of using a 2.5 I4 yj motor mated with a t15 tranny with a d18
tcase if I can find an adapter for that setup next I was thinking d30 axles with 4.10 gearing and a yj suspensions stock and a soa conversion I want the axles to stick out beyond the body enought so the tires do not come into contact with the body I was thinking of running 35's and I want around 18-24" of ground clearance so it's not too unstable. Yj steering and brakes and any type of wiring and engine control computer stuff (yeah I know I got some reseArch to do...) now I'm not sure what type of frame to use I don't know if their is any vehicle frame I can use or if I have to go all custom I was thinking of having a short length maybe 72" I'm still working out details and looking for parts but I figured I would pitch it to you guys see what you think....

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Old 01-14-2014, 09:02 PM   #2
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buy you a yj with a junk body and snatch it off

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Old 01-14-2014, 10:16 PM   #3
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D30 is only a front axle to my knowledge. YJs came with a d35 in the rear which is a questionable axle even with a lightweight buggy. The ford 8.8 is a common swap and should be good for what you are planning. Sounds like a fun build.
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Old 01-14-2014, 10:18 PM   #4
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Why the t18 case? The np231 in most YJs is a good case.
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Old 01-15-2014, 10:50 AM   #5
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I would go full width on the axles my self. Light weight like that you would be fine with a full width 8.8 and a d44 and 35s probably up to 37s really or D44s front and rear... The 8.8 is stronger though..

And all that work to run a 4 cylinder? Nah, at least set it up with a 4.0 or 4.3. SBC would be my choice unless I had something sitting in the shop or was getting a smoking deal on a whole power train...
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Old 01-21-2014, 06:17 PM   #6
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Ok, I will give it a shot...Good ideas but wrong calculations.

You want stock YJ axles with 4.10 gears and 35's? that 4cyl is going to have a tough time trying to turn 35's with only 4.10 gears. I would think more like 5.13's would be better, but you cant get anything deeper than 4.88's in the stock housings.

You want 18-24 inches of ground clearance on 35" tires. The center of a 35" tire is 17.5" and minus the inches to the bottom of the differential, and you are down to about 12" of ground clearance. (actually 11.75" on my YJ with 35's) So...now you have to install much larger tires to get 18-24" of ground clearance...That little 2.5L is hating you by now!

You want spring over axle suspension, but full width axles, so the tires stick out past the body, so you aren't running stock axles anymore. cause they don't make a D30 in full width. So, go to a D70 or D80 so you can install some 5.13 gears. that way your 4cyl motor will make them go around.

And you want all of this in a 72", I'm assuming, wheel base? Short and tall? lol. Nice try, but you forgot to factor in the fact that if you have a 72" wheel base, the drivetrain isn't even possible. The back of the t-case will be beyond the front of the back rear end. I would love to see how you are going to make that driveshaft work.

Its nice to dream about a cool buggy, but in all reality, just cause it looks good in your head...it isn't feasible to put on paper much less make it happen in real life. Keep dreamin' kid, someday you might come up with a winner.

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