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Unread 08-18-2006, 12:53 PM   #1
Big-n-Broke-YJ
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Extending The Wheelbase on a YJ - How To

As I continue to work on the buildup of my new axles the thought of extending my wheelbase keeps becoming more and more intriguing....

I've searched quite a bit on different forums and found a little bit of information here and there specifying different springs and the amount of wheelbase you/I would gain using them, but i can't seem to find a FAQ for extending wheelbase or a thread containing EVERYTHING pertinent to the concept so I thought this might be a good way to gather a pelthora of info that will help me now, and everyone else as they need it....

The most common method I've come accross is using wagoneer springs but i'm unsure of how the 2" of stertched wheelbase are achieved... using both front and rear springs? oem? or just front?

f150 leafs (not sure of year, oem, lift springs, etc) will locate from the front axle forward about 2" and allow for use of the OEM steering (for the most part). i've rear rumors that F150 rear springs will give another 2" of wheelbase as well.

dodge dakota springs (again, unsure of year, oem, or aftermarket) will pusht he front axle forward about 1"


so add to this list, correct my list where i have mistakes, and give any additional insight you may have about this subject.

when i install the full widths the front spring perches will need to be moved outward an inch or so, i forget, but will the leaf springs that "extend" wheelbase require the front perch to be moved forward as well? or retain the same position as oem placement?

20 questions and growing...

-Erik <--- will continue to search

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'89 Wrangler, 4.0/AW4, 106" Wheelbase, SOA, custom XJ packs, 2" Body. Front High Pinion Dana 44 w/yukon super-joints, chromo inners and outers, and a Lincoln Locker. Rear Dana 60 w/Yukon 1.5" 35 Spline chomo shafts and detroit locker. 5.38 Yukon Gears. Hydro-Assist, 39.5x18" Boggers on 15x12 RockKrawler's w/ 2.75" of backspacing. Comp cut, tube fenders, custom bumpers and rock sliders, fuel cell, CB, Stewart Warner Gauges, SmittyBilt XRC8 Winch, 140 Amp CS-144 Alternator, Electric Fan, and a cooler of beer. 3897 lbs

March 1st, 8pm. WILMINGTON, NC MEET & GREET @ HOOTERS!
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Unread 08-18-2006, 01:05 PM   #2
hdfxrs91
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If you use different springs to move the rear axle back, what would happen with the wheel well?
I have seen where bodies and frames were cut in half, then "I" beams were used to lengthen the frame and sheet metal used to lengthen the body. Sounds like a lot of work to me.
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Unread 08-18-2006, 01:24 PM   #3
jeepskate
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You should be able to find all the info you need on pirate4x4.com...just search, if you ask you'll get flamed because the knowledge is as common as rain in Seattle over there. Basically, the spring center pins are located differently from the stock YJ springs, and that's how the axle ends up being relocated/wheelbase stretched. Concerns will be how to go about accomodating the extra spring length since all of the ones commonly used are longer springs than YJ's, steering clearance, body clearance (sawz-all all the way up to the more extreme comp cut for mega stretches), gas tank clearance, driveshaft length and angle changes, etc.
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'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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Unread 08-18-2006, 01:25 PM   #4
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Quote:
Originally Posted by hdfxrs91
If you use different springs to move the rear axle back, what would happen with the wheel well?

Mild case, sawz-all and some TJ flares. Extreme case, comp cut.
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'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.
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Unread 08-18-2006, 01:27 PM   #5
Big-n-Broke-YJ
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i plan to comp cut the rear or get poison spyder rear pieces to replace the factory sheetmetal (or use as a template for cutting and isntall over factory sheetmetal)

that will eliminate the problem of the body being in the way of the tire.

in the front the only thing that woudl be in the way would be the bumper... which wouldn't be an issue if only moving the front axle forward a couple inches (for me at least).

don't really plan on moving the axle back so far that the frame will need to be extended but that could change... after seeing other people's setups it doesn't really seem too awful difficult to do... i'm just having difficulty finding springs that will allow me to keep the same height as my current 3.5" superlift springs AND allow me to relocate the axles to increase wheelbase. I'm really only looking for a total of 4-6" from the front and back, but that may very well change more or less depending how in-depth it gets....
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'89 Wrangler, 4.0/AW4, 106" Wheelbase, SOA, custom XJ packs, 2" Body. Front High Pinion Dana 44 w/yukon super-joints, chromo inners and outers, and a Lincoln Locker. Rear Dana 60 w/Yukon 1.5" 35 Spline chomo shafts and detroit locker. 5.38 Yukon Gears. Hydro-Assist, 39.5x18" Boggers on 15x12 RockKrawler's w/ 2.75" of backspacing. Comp cut, tube fenders, custom bumpers and rock sliders, fuel cell, CB, Stewart Warner Gauges, SmittyBilt XRC8 Winch, 140 Amp CS-144 Alternator, Electric Fan, and a cooler of beer. 3897 lbs

March 1st, 8pm. WILMINGTON, NC MEET & GREET @ HOOTERS!
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Unread 08-18-2006, 01:29 PM   #6
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Quote:
Originally Posted by jeepskate
You should be able to find all the info you need on pirate4x4.com...just search, if you ask you'll get flamed because the knowledge is as common as rain in Seattle over there.
the search feature has been removed from pirate since the last time i used it (quite a while ago).

i heard you can use google or yahoo and use a specific search string such as "www.pirate4x4.com: search phrase" but i'm having horrible luck... can anyone verify the search string needed to allow me to search that forum?

-Erik <--- wants to ask, really bad, but not ready to be flamed just yet
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'89 Wrangler, 4.0/AW4, 106" Wheelbase, SOA, custom XJ packs, 2" Body. Front High Pinion Dana 44 w/yukon super-joints, chromo inners and outers, and a Lincoln Locker. Rear Dana 60 w/Yukon 1.5" 35 Spline chomo shafts and detroit locker. 5.38 Yukon Gears. Hydro-Assist, 39.5x18" Boggers on 15x12 RockKrawler's w/ 2.75" of backspacing. Comp cut, tube fenders, custom bumpers and rock sliders, fuel cell, CB, Stewart Warner Gauges, SmittyBilt XRC8 Winch, 140 Amp CS-144 Alternator, Electric Fan, and a cooler of beer. 3897 lbs

March 1st, 8pm. WILMINGTON, NC MEET & GREET @ HOOTERS!
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Unread 08-18-2006, 01:46 PM   #7
biggreentj
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best way to stretch is to make a rear crossmember with mounts for the shackles, then new front mounts for the leafs, and move them back the same distance as your rear mounts, thats how i did mine, every simple. ohh and i used the stock lengh BDS 2" SOA leafs

here is mine, u can see where the stock mount is, and what i added, then i just moved the front mounts the same diststance as the old rear center mount and new rear center mount.
here is a pic of the rear during some finish work

and here u can see the added WB, about 9" added

if u have any questions let me know
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[B]91 YJ 4.0/ax15 Stretch to 102" D44s 5.38s Detroits/Hi Steer/38.5"TSLs/Custom full cage/ Corbeau seats/Crow Harnesses/PSC comp corners.[/B]
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Unread 08-18-2006, 01:50 PM   #8
Ustabearenegade
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ok i guess ill post my opinion - im not going to flame you and you will find my info usefull I promise. One way to stretch the jeep well, you can do this a few diffrent ways, this way being the cheapest. I assume your going SOA?

In the front take off the spring plate, located the centering pin, relocate center pin hole 2" forward. reinstall and theres 2 inches no further assembly required.

For the rear well there are a LOT of options, the easiest again is locate a set of XJ springs - relocate rear spring hanger to rear bumper - install springs and SOA. There is now 3 inches back and i think you can even do the spring plate trick to the rear as well. - everything should be OK with the exception of the driveshafts.
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Unread 08-18-2006, 02:04 PM   #9
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so far this is what i've come up with searching JU (since Pirate can't be searched yet since i don't know how )

this concentrates on stretching the rear.... pretty simple, very effective, and aside from the cost of a fuel cell (or other way to fix the clearance problems with the stock tank) very inexpensive...

Quote:
Originally Posted by grannygear @ JeepsUnlimited

I got the rear springs hung and the gas tank out. I moved it all back 6" at the fixed hangers and 5.5" at the shackle hangers. I made some pretty stout reinforcements to the stock rear crossmember (and a bit more to come) so the extra stress there will be dispersed into the frame rails. It should be nice and strong.
Quote:
Originally Posted by LeadFoot @ JeepsUnlimited
I think you could do it the same way I did while keeping the sua set up. I got 10" of wb from moving the spring hangers back and re drilling perches.
Quote:
Originally Posted by Tolly from JeepsUnlimited
Progress report. Finished the rear shackles and got the springs in.
Springs are in:

Quote:
Originally Posted by Tough91YJ on JeepsUnlimited
i like wallys way, but if you want to go an easier route with less fab. do what i did. make a rear crossmember for your bumper, fab some shackle hanger mounts. then move your rear front frame mounts back to the desired lengh, and your stretched. i got about 9" extra in WB now.

here is rear view

hope this helps
if anyone objects to the quoting of their posts i gathered from JU then let me know and i'll remove them. I tried to make sure everyone quoted was given credit.
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'89 Wrangler, 4.0/AW4, 106" Wheelbase, SOA, custom XJ packs, 2" Body. Front High Pinion Dana 44 w/yukon super-joints, chromo inners and outers, and a Lincoln Locker. Rear Dana 60 w/Yukon 1.5" 35 Spline chomo shafts and detroit locker. 5.38 Yukon Gears. Hydro-Assist, 39.5x18" Boggers on 15x12 RockKrawler's w/ 2.75" of backspacing. Comp cut, tube fenders, custom bumpers and rock sliders, fuel cell, CB, Stewart Warner Gauges, SmittyBilt XRC8 Winch, 140 Amp CS-144 Alternator, Electric Fan, and a cooler of beer. 3897 lbs

March 1st, 8pm. WILMINGTON, NC MEET & GREET @ HOOTERS!
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Unread 08-18-2006, 02:47 PM   #10
Midnight22
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im assuming the above rigs are NOT street legal?
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Unread 08-18-2006, 03:02 PM   #11
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Quote:
Originally Posted by Midnight22
im assuming the above rigs are NOT street legal?
Not in most states.
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Unread 08-18-2006, 03:41 PM   #12
Big-n-Broke-YJ
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legality means nothing to me. 6" lift law already broken, might as well break a few more while i'm at it.
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'89 Wrangler, 4.0/AW4, 106" Wheelbase, SOA, custom XJ packs, 2" Body. Front High Pinion Dana 44 w/yukon super-joints, chromo inners and outers, and a Lincoln Locker. Rear Dana 60 w/Yukon 1.5" 35 Spline chomo shafts and detroit locker. 5.38 Yukon Gears. Hydro-Assist, 39.5x18" Boggers on 15x12 RockKrawler's w/ 2.75" of backspacing. Comp cut, tube fenders, custom bumpers and rock sliders, fuel cell, CB, Stewart Warner Gauges, SmittyBilt XRC8 Winch, 140 Amp CS-144 Alternator, Electric Fan, and a cooler of beer. 3897 lbs

March 1st, 8pm. WILMINGTON, NC MEET & GREET @ HOOTERS!
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Unread 08-18-2006, 10:25 PM   #13
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So then I guess all of you are running a fuel cell then?
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Unread 08-18-2006, 10:50 PM   #14
biggreentj
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Quote:
Originally Posted by Midnight22
im assuming the above rigs are NOT street legal?
by the books?? no mines not street legal, do i have problems with that?? nope.
mine, the blue one, is my daily driver, every day every minute.
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[B]91 YJ 4.0/ax15 Stretch to 102" D44s 5.38s Detroits/Hi Steer/38.5"TSLs/Custom full cage/ Corbeau seats/Crow Harnesses/PSC comp corners.[/B]
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Unread 08-18-2006, 10:51 PM   #15
biggreentj
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Quote:
Originally Posted by biggreentj
by the books?? no mines not street legal, do i have problems with that?? nope.
mine, the blue one, is my daily driver, every day every minute.
Quote:
Originally Posted by TSEJEEPERS
So then I guess all of you are running a fuel cell then?
no fuel cell, just moved stock tank up behind the seats, who needs a fuel cell? thats a waste of money
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[B]91 YJ 4.0/ax15 Stretch to 102" D44s 5.38s Detroits/Hi Steer/38.5"TSLs/Custom full cage/ Corbeau seats/Crow Harnesses/PSC comp corners.[/B]
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