Building my 2005 CRD, 4" JBA lift, 33" KM2, 4.56 gearing

2006 KJ · **Posted:** Wed Jul 27, 2011 12:20 am

that's great... cant wait to see it finished. it's going to flex like crazy! should have plenty of strength, and power for those 33's... could actually get away with 34's i bet.

Sport · **Posted:** Wed Jul 27, 2011 8:35 am

That is fantastic, for the most part you are making my dream a reality. Can't wait to see it finished. What sliders did you go with.

arengant · **Posted:** Wed Jul 27, 2011 10:56 am

William Waddy wrote:

The last photo a couple of posts up (previous) shows the CV axle, although the Liberty is on a lift and the tires are freely dangling down. The SIFS differential is apparently about 3 inches narrower than the stock differential, so that helps a bit on reducing the angle. Next time it's on the ground I'll take a photo of the CV's. I am also anxious to see flex when completed.

I saw the pictures on the lift, and at full drop it doesn't look bad, so you should be good. Which means driving angles should be good too :lol:

William Waddy · **Joined:** Mon May 09, 2011 4:16 pm **Posts:** 56

CRDphenox wrote:

William Waddy wrote:

Based on my experience I suggest anyone looking to go with the 15" steel wheels stay on the small side of 4" backspacing (i.e., 3.75 or 4), since the 4.5 did not work at all for me.

Do you think you would have been able to fit 33/12.5s if you went with 3.75 on the backspace?

Perhaps. However, the possible problem is that a wider tire, when turned fully, will dig further back than a narrower tire, although i am not sure by how much. I suppose you could cut a couple pieces of cardboard into rectangles, one 33 x 10.5 and one 33 x 12.5. You could then put a nail in the center and pivot the rectangles to simulate the increased diameter during a turn. Actually, i suppose you could do the same thing with a piece of chalk and a string. Anyway, it would not be the inside clearance that might be a problem with the 12.5's, rather it would be the increased effective radius/diameter. It is pretty tight even cutting into the rear of the wheel wells and i did not want to chance the 12.5's. Also, the country around here is mostly slick rock and i believe i will get better grip and maneuverability with the narrower tire.

William Waddy · **Joined:** Mon May 09, 2011 4:16 pm **Posts:** 56

Sport wrote:

That is fantastic, for the most part you are making my dream a reality. Can't wait to see it finished. What sliders did you go with.

I went with the supersliders. I like that they stick out a bit to protect the side panels as well as provide a step. However, i am wondering if the attachments are beefy enough since all that tubing that shows on the outside is connected to the frame through just a few much smaller pieces of square tubing (or maybe they are solid). Even though they are bolt on, i will put a few spot welds for a little reinforcement and to make sure they do not loosen up.

JeepinJarhead03 · **Posted:** Thu Jul 28, 2011 6:46 am

im sure the supports are tube, if they were solid they would have bent during install

pm'ed ya a lil somethin as a fyi or a bit of help or whatever ya wanna call it

William Waddy · **Joined:** Mon May 09, 2011 4:16 pm **Posts:** 56

Here are photos of completed build. I'll get out on the trail in the next couple of days and post some wheeling pics and videos.

JBA 4" lift, front trail hitch, full skid plates, 4.56 gears, ARB air lockers front & rear, steel IFS differential, JE Reel cut CV's, cast rear diff cover, ARB compressor, trimmed fenders, pounded and cut wheel wells, BFG KM2 33x10.5x15 tires, receiver-mounted Warn crawler 9000lb winch, GDE hot tune, suncoast TC, Safari snorkel.

Chino78 · **Posted:** Mon Aug 01, 2011 6:40 pm

Looks awesome!!!... Seems you need a steel stubby bumper...

I would love to see full flex pics...

Sport · **Posted:** Tue Aug 02, 2011 9:59 am

great work, how do the 4:56 gears feel on the road?

STINGN · **Posted:** Tue Aug 02, 2011 12:16 pm

everything is soooo clean!!!!!

William Waddy · **Joined:** Mon May 09, 2011 4:16 pm **Posts:** 56

Video on the trail

rides great. little oops at the end with result = one broken rear axle shaft, broken transfer case gears. Good news is that none of the new stuff broke. After a few tears, back in the shop for repairs and promise to be a little more careful (light on the peddle) next time out.

http://www.youtube.com/watch?v=79OgT8BD0lQ

STINGN · **Posted:** Tue Aug 02, 2011 9:11 pm

William Waddy wrote:

Video on the trail

rides great. little oops at the end with result = one broken rear axle shaft, broken transfer case gears. Good news is that none of the new stuff broke. After a few tears, back in the shop for repairs and promise to be a little more careful (light on the peddle) next time out.

http://www.youtube.com/watch?v=79OgT8BD0lQ

yea it sounded like an ouchie lol

awesome!

infernicus · **Posted:** Tue Aug 02, 2011 9:40 pm

Looooooks Gooooood out there!

DirtyKK · **Posted:** Tue Aug 02, 2011 10:09 pm

wheel hop sucks! upgraded axles are fairly cheap for the rear though.

arengant · **Posted:** Tue Aug 02, 2011 10:31 pm

William Waddy wrote:

broken transfer case gears.

There is a NP242 in the for sale section... or upgrade time!!!!!! (Atlas, or np241OR??)

William Waddy · **Joined:** Mon May 09, 2011 4:16 pm **Posts:** 56

Sport wrote:

great work, how do the 4:56 gears feel on the road?

The 4.56 gears feel good. The speedometer still reads a couple mph low I think (need to check against gps). The feel is pretty much back to stock power. Or, actually, with the GDE hot tune it feels better than stock - substantially.

William Waddy · **Joined:** Mon May 09, 2011 4:16 pm **Posts:** 56

arengant wrote:

William Waddy wrote:

broken transfer case gears.

There is a NP242 in the for sale section... or upgrade time!!!!!! (Atlas, or np241OR??)

I am now thinking about upgrading axle shafts and transfer case, perhaps closer to 4 to 1. I'll check previous threads and appreciate any advice.

tommudd · **Posted:** Wed Aug 03, 2011 10:30 am

Yukons are good axles
Have them in mine :wink:

jeepinoutfitters have them for 112.49 each
just the first place the popped up

arengant · **Posted:** Wed Aug 03, 2011 12:27 pm

William Waddy wrote:

arengant wrote:

William Waddy wrote:

broken transfer case gears.

There is a NP242 in the for sale section... or upgrade time!!!!!! (Atlas, or np241OR??)

I am now thinking about upgrading axle shafts and transfer case, perhaps closer to 4 to 1. I'll check previous threads and appreciate any advice.

If I had the money, I like the Wrangler Rubicon t-case the 241OR RockTrac, looks like a clean install (vs the atlas that you need different shifters) and beefy enough... JJsKJ has one, and I think I saw someone else swap it in keeping the IFS.

Of course TjKj2002 has the atlas and loves that too

William Waddy · **Joined:** Mon May 09, 2011 4:16 pm **Posts:** 56

Arengant - do you know what the ratio is on the rubicon transfer case?For now I think I'll just fix the stock case, but I want lower gearing for the rocks so an upgrade won't be too far off.

Follow up - i've been reading about the 241OR rocktrac (4:1). Very interesting.

Building my 2005 CRD, 4" JBA lift, 33" KM2, 4.56 gearing

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