Front frame extension - JeepForum.com

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post #1 of 46 Old 02-27-2008, 09:12 AM Thread Starter
E_ROCK
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Front frame extension / Front stretch

Do you think this would work on the front of a yj if you cut the existing front cross member out of the way?

http://www.pirate4x4.com/forum/attac...hmentid=141805


http://www.pirate4x4.com/forum/attac...hmentid=141806

http://pirate4x4.com/forum/showpost....03&postcount=2


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Last edited by E_ROCK; 04-21-2008 at 08:35 AM.
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post #2 of 46 Old 02-27-2008, 12:32 PM
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why? what is the goal in doing this? in your example pictures I'm not clear on why this was done in the first place. usually if you bob the frame or build a new back half it is to tuck the frame rails under the bed of the jeep to allow for suspension options like longer rear shocks run vertical. in the front, the frame rails are already as narrow as possible.
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post #3 of 46 Old 02-27-2008, 12:47 PM Thread Starter
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I want to extend the front wheel base up front 5 to 6". I have shackle reversal up front and would like to keep it. That means I would need to extened the front rails forward to mount my frame side leaf mount. I could extend my front wheel base the same way that doug_1994 or Tomb Raider, with the shackle forward design on the end of a cross memeber. But, my knuckle have been rotated with shackle reversal in mind and I don't know what it will do with my caster.

Why the front and not the rear? Well, I just finished an atlas II install + tummy tuck. The front output of the Atlas is a couple of inches farther forward than the NP231 which would cause me to have to shorten the front driveshaft. Well, I never take the easy road. So instead of shorten the front driveshaft, I said why not push the front axle forward. I have my fenders off right now, so access is easy to the frame. Also, I have made a new hood hoop that needs a frame support. I was going to tie the hood hoop to some new shock hoops, but I didn't what to weld the shock hoops yet because I wanted some more wheel base.

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post #4 of 46 Old 02-27-2008, 04:19 PM
91yjwrangler6
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It's kinda pointless to stretch the front frame rails unless your running mud drag races. Those are usually the only jeeps you see that have stretched front frame rails.

91 yj, 4.0, AX15, SOA, 8.8 rear, 4.88 gears, 2.5 inch springs front, m.o.r.e shackle reversal, m.o.r.e shock hoops, 3 inch springs in rear, bilstein 5150's, shock bar, m.o.r.e traction bar, lockers, m.o.r.e high steer, SYE, old school bronco cv shaft, tube fenders, 36 inch tsl's
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post #5 of 46 Old 02-27-2008, 04:20 PM
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Thats exactly what I plan on doing to my front end. I have my shackle hangers mounted to the front of my bumper, where as I would like to have them below the frame. To run a shorter shackle. I want to keep things as low as possible.

Doug

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post #6 of 46 Old 02-27-2008, 04:26 PM Thread Starter
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Quote:
Originally Posted by 91yjwrangler6 View Post
It's kinda pointless to stretch the front frame rails unless your running mud drag races. Those are usually the only jeeps you see that have stretched front frame rails.


Quote:
Originally Posted by doug_1994 View Post
Thats exactly what I plan on doing to my front end. I have my shackle hangers mounted to the front of my bumper, where as I would like to have them below the frame. To run a shorter shackle. I want to keep things as low as possible.

Doug
Have you been able to find any good pictures of other peoples rigs? I have been web researching for days now and I am not really coming up with anything.

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post #7 of 46 Old 02-27-2008, 04:39 PM
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No, I haven't seen any pics, but it would be just like the ones you posted.

If I come across any I'll be sure to pass them on to ya.


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post #8 of 46 Old 02-27-2008, 06:17 PM
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My friend Rob stretched his front about 6" with wagoneer springs. He made new spring buckets and mounted the shackles to the front crossmember tube. He didn't lengthen the frame at all. He estimates it to be around 3" of lift right now with the SOA, it is l-o-w and it works until he breaks a main leaf but that's another story.




107"
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post #9 of 46 Old 03-17-2008, 12:23 PM Thread Starter
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I know this is a very "open ended" question, but how many inches should I stretch the front? I was going to do 6" right now and I still plan on shackle reversal, extending the front frame with a new cross member, and relocated the box foward.

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post #10 of 46 Old 03-19-2008, 03:37 PM
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I guess it would matter on what size tires you are running.

Mine with 110", and 39.5" tires my belly drags alot.

Thats why I want the flat belly in the worst way.

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post #11 of 46 Old 03-29-2008, 08:16 PM Thread Starter
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I guess I decided on 6". I still plan on running 37" tire this next season.

I made a frame extension for the pass side.


A buddy of mine came up with a good idea of how to cut the driverside sleeve so that we could salvage the captive nuts in the frame and reuse them.



Captive nuts - We cut them out and rewelded them into the sleeve.


I found some 3/8" steel sch 40 pipe nipples that fit a 7/16" bolt great.


I found this when I took my axle apart. Pass side U-joint was about to blow


This is about were we left it. It should be ready to add a cross member/bumper.

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post #12 of 46 Old 03-30-2008, 07:59 AM
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Quote:
Originally Posted by E_ROCK View Post
I guess I decided on 6". I still plan on running 37" tire this next season.

I made a frame extension for the pass side.


A buddy of mine came up with a good idea of how to cut the driverside sleeve so that we could salvage the captive nuts in the frame and reuse them.



Captive nuts - We cut them out and rewelded them into the sleeve.


I found some 3/8" steel sch 40 pipe nipples that fit a 7/16" bolt great.


I found this when I took my axle apart. Pass side U-joint was about to blow


This is about were we left it. It should be ready to add a cross member/bumper.
What is that 3x4 1/4" wall?

-NorthJeep - >> Just Enough Essential Parts

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Last edited by northjeep; 04-30-2008 at 06:02 PM.
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post #13 of 46 Old 03-30-2008, 08:30 AM
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What axle is that in your last picture?

93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list.
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post #14 of 46 Old 03-31-2008, 08:22 AM Thread Starter
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It is a low pinion, waggy D44.

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post #15 of 46 Old 04-19-2008, 04:18 PM Thread Starter
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Here is the important side, the steering box side.




The grill gets in the way of the PS box hoses. Both the front of the grill and the engine bay side had to get trimmed.



Passenger side


Side view


Front view

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