Question: im building a rock crawler with my 1988 jeep YJ and need some advice?

FAQ:

im building a rock crawler with my 1988 jeep YJ and need some advice?

i just bought a jeep yj tub and frame and want to make it into a rock crawler. i have a few questions that i cant really get answers for and beem looking for a while to figure them out.
1. what type of engine would be bast for rock crawling ( i was thinking a diesel cause i know it puts out allot of torque), im not sure on what engine i could get that would put out allot of torque.
2. i wanted to put 40″ tires on the jeep but not sure white size lift i should put on, i want to have the most flex possible without rubbin (i also want to put on a body lift but dont know how much would be best)(i am not going to have any fenders on the jeep and if i do they are gunna be custom built) also what size rims would be best for those tires, if u know of a better size tire to use that would also help me out
3. what kind of axles would be best to use

-if you have any other sites that would help it would be greatly appriciated, also any sites that have parts
-i am asking these questions because i know there are others out there that know more about this than me
-i plan on building it from the ground up and dont mind taking 5-10 years to build it to make it perfect
-if you can explain everything to me and the reason for that answer it would be nice

my email is burntboarder420@yahoo.com if you would like to talk and help me out a little more

thankyou for your time

Answer by Hyde
www.pirate4x4.com

good luck getting any worthy advice from this site.]]\

1. A small gas engine would be best as you’re going to gear it down. You want finesse, not gobs of torque.

2. dunno but if you’re going to get serious you’ll go with a spring over conversion.

3. dunno.

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3 Responses to Question: im building a rock crawler with my 1988 jeep YJ and need some advice?

  1. Mike S says:

    40″ inch tires is a tall order. You are going to need stronger axles and a major custom designed long arm suspension to carry them.

    As for the engine, the Jeep 4.0 is awesome. If you need more torque do a stroker conversion. The 4.7 stroker with eh Renix head and controller makes awesome torque.

    Mike

    http://www.mikestrawbridge.com/jeep-cherokee-off-road.shtml

  2. 4x4guru says:

    If you want tourqe go with the chevy 6.0 f.i.. Coil springs or coilovers it will flex awesome as far as wheel size 15,16,17? doeosnt really pertain to the tire size. Axles dana 60 w/arb locker and a 14 bolt chevy w/spool. And yes check out Piratebb

  3. pickupman82 says:

    1. A small block chevy (350 cid) is common, makes good power, and pretty cheap to fix. Get a fuel injected engine as the angles the vehicle will be at with crawling wont do well with a carbed engine. The 4.2ltr and 4.0ltr are darn near bullet proof and have good power as well. The trans is upto you. Autos are easier to drive but need a cooler. Manuals tend to have lower first gears with the SM420 have a 7.05 first gear and the SM465 has an 6.55 first gear. They are both pretty popular swaps in Jeeps due to thier short case (12″). You will also want to get a strong tcase and put a 4.00:1 low range in it. Dana 300s are pretty common or the aftermarket Stak boxes.

    2. 40″ really isnt all that bad. As far as lift goes, keep it as low as possible but with the most travel. I would stay away from a body lift. Hack the fenders to make room. A custom suspension with coil overs will provide the best performance, but rear leafs and front coils can still flex well.

    3. Dana 60 front with GM 14 bolt full floater rear if you are going to run 40″+ tires. Lockers will be mandatory. If you plan on driving on the road as well you might look into a selectable locker (air locker, electric locker, cable locker), they can be turned on and off. If this is a trail only rig, through a permanant locker in there and be done.

    With the SM420, Dana 300 with 4.0:1 low, the 60/14 axles with 5.38 gears you would have a 151.72 crawl ratio.. With the low first gear trans and tcase you could run a 4.56-5.29 rear end and get decent mileage on the road if you plan on driving it around town.

    There are alot of forums available, though you will receive a better welcome at some more than others. Pirate can be a pretty tough crowd, especially for a “newbie”.

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