4 link fitment ideas - JeepForum.com
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post #1 of 23 Old 06-26-2019, 05:56 PM Thread Starter
Waternut
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4 link fitment ideas

So I was laying under my jeep this evening dreaming about how I'm going to make my 4 link rear work with everything that is currently underneath there combined with my original plans and goals. First issue is that my muffler is in the way of the passenger upper frame mount. I can modify this to work... I think. However, this issue has me re-evaluating my desire for a stretch.

So stretching brings me back to running a fuel cell in the bed. I really...REALLY don't want to run a fuel cell in the bed but I'm getting closer and closer to it just to allow my links to be longer and fit everything a bit easier. I don't ever drive with a top on my jeep so if I decide it's a nice day and drive the jeep to work, the gas tank will be in the sun all day and probably dump fuel everywhere if it's close to full. I wouldn't mind cutting a hole in the bed of the jeep for a spout if I managed to fit a fuel cell in the stock location though but not sure how that'd work.

If I were to stretch the wheelbase, has anyone tried denting a stock tank? I recall reading something about this but I can't seem to find the information to see how much clearance this could add or if it'd even be worth it. I currently have the 15 gal metal gas tank and I seem to recall people only denting the plastic one with heat.



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post #2 of 23 Old 06-26-2019, 07:02 PM
Joe Dillard
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I don't recall how much stretch Erik ended up with, but as a guess he went to ~104".

Here's an idea for an exhaust run on Erik's linked YJ.





He used a GenRight under tub stretch tank & put it in the tub.

We built an aluminum cover & small carry tray over the top for it afterwards but I don't have pics of that.




The front & rear 3/4 link was custom built & works like a champ.

On mine, I went with a GenRight 23 gallon tub cell since the pump is basically plug & play.


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post #3 of 23 Old 06-27-2019, 04:27 AM
87TPIYJ
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I was in the same boat with no cell in the tub. One of the reasons I went with the unlimited stretch. Also GR makes the crawler tank that can net you 4-6" of stretch. They are pricey, but currently the only game in town for a tank in stock location.

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post #4 of 23 Old 06-27-2019, 10:34 AM
Randonexplosion
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@Joe Dillard I am running the same fuel cell but closer to the tail gate. Is your pump obnoxiously loud?
@Waternut quite a few people have dimpled the poly tank. It seems that the more you dimple it the more chance you have of cracking down the road. You could probably get 3 or 4 inches.


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post #5 of 23 Old 06-27-2019, 12:09 PM Thread Starter
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Well I think I can get 1/2" to 1" of rear stretch right now before the diff hits the gas tank skid and I know I can get another 1-2" inches in the front with minimal work as well. I might even be able to dent/cut the gas tank skid plate in a very minor way to get a hair more. I'm currently sitting a 96" so this would put my wheelbase at 98"-100".

So I'm partially onboard with the option of running a fuel cell in the bed and putting a cargo rack over the wheel wells for extra storage space. However, I keep bouncing back and forth because that's a lot of work and money for a few extra inches of wheelbase. My other thought was if I can get 98" without reworking the whole gas tank situation and cutting/fabbing new fender flares, maybe that's my easiest compromise. The upper link brackets are adjustable so if the links need to be lengthened a lot at a later date, I should still have the flexibility to keep the anti-squat numbers reasonable and it should only require new links at most....although I'd probably cut and sleeve the links if that was the case.


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post #6 of 23 Old 06-27-2019, 12:37 PM
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When I stretched my CJ I went 5" forward with the front and 10" back with the rear and four linked both and swapped Chevy 14 bolt rear and 44 front and run at 109" wheel base and 38s and love it. Tons of flex and real stable. I can run to the top of an RTI ramp and even over the back side and never lift a rear tire. that is some flex!!! I have a poly fuel cell from Jegs in the bed and a Yakama rack over it that I mounted a couple of large tool boxes to haul stuff and even mount an air tank and cooler up there. I never had anyone in the back seat while wheeling anyway. The exhaust wasn't a big deal to reroute a bit.
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'84 CJ7, 44, 14 bolt, twin stick 300, 109"whl base, 4 linked
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post #7 of 23 Old 06-27-2019, 02:20 PM
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Quote:
Originally Posted by Randonexplosion View Post
@Joe Dillard I am running the same fuel cell but closer to the tail gate. Is your pump obnoxiously loud?
Not at all. I can barely hear/notice it once I start it.
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post #8 of 23 Old 06-29-2019, 11:46 AM
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Not at all. I can barely hear/notice it once I start it.
Must be my Bosch pump. I need to find an OE one.

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post #9 of 23 Old 06-29-2019, 04:24 PM
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I spent many wasted years doing the little 1-2" stretches front and rear. I ran a dimpled stock tank and had no problems but was never real happy with just an additional inch or two. I ended up doing the unlimited stretch AND running a cell in the back and have zero regrets. I never wanted to run a cell and did a lot to avoid it but once I did I realized that its not that big of a deal to me. I'm now running a 115" wheelbase and am finally at a happy spot.

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post #10 of 23 Old 06-29-2019, 06:03 PM Thread Starter
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Originally Posted by '92 vegas YJ View Post
I spent many wasted years doing the little 1-2" stretches front and rear. I ran a dimpled stock tank and had no problems but was never real happy with just an additional inch or two. I ended up doing the unlimited stretch AND running a cell in the back and have zero regrets. I never wanted to run a cell and did a lot to avoid it but once I did I realized that its not that big of a deal to me. I'm now running a 115" wheelbase and am finally at a happy spot.
As much as I'd love to have that setup, it's a big leap in both time and money to go from a 96" WB with D30/8.8 axles and 35's to a full on 115" WB with 40+'s and full size axles. Realistically, I'm not ready to put forth the effort for a YJ-8 at this time either. I don't really have too many people of that caliber to be competing/keeping up with either and I still enjoy driving my jeep on the road when the weather is nice.


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post #11 of 23 Old 06-29-2019, 06:09 PM Thread Starter
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Here is my current solution to exhaust clearance... Cutting 6 or so inches off the exhaust setup is basically free but took a bit longer than I had planned to accomplish. With 4th of July coming up and friends coming in town, the whole 4 link setup will have to wait until afterwards but this is something that needs to be done and I can accomplish it now and still use the Jeep.
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post #12 of 23 Old 06-30-2019, 11:30 PM
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Originally Posted by Waternut View Post
As much as I'd love to have that setup, it's a big leap in both time and money to go from a 96" WB with D30/8.8 axles and 35's to a full on 115" WB with 40+'s and full size axles. Realistically, I'm not ready to put forth the effort for a YJ-8 at this time either.
I dont think Chris is saying that you need to run 42s and 115" wheelbase to be happy. I was given the same advice: you will never notice 1 or 2" and it probably won't be worth the cost. As I mentioned before, if you're gonna put this much work into something I would shoot for 5, 6 or 7" of stretch. Wheelbase can have an affect on ride quality too.

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Originally Posted by '92 vegas YJ View Post
I spent many wasted years doing the little 1-2" stretches front and rear. I ran a dimpled stock tank and had no problems but was never real happy with just an additional inch or two.


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post #13 of 23 Old 07-01-2019, 07:55 AM Thread Starter
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I dont think Chris is saying that you need to run 42s and 115" wheelbase to be happy. I was given the same advice: you will never notice 1 or 2" and it probably won't be worth the cost. As I mentioned before, if you're gonna put this much work into something I would shoot for 5, 6 or 7" of stretch. Wheelbase can have an affect on ride quality too.

Maybe you'll roll your eyes at this but the goal is 5-7" of total stretch from a stock 93" wheelbase. It's just that I currently have 3" already from a previous mod to better my shackle angles and now that I'm changing things, I have the oppurtunity to get some more without a lot of work. I've only felt unstable a couple times climbing things so I don't have a legit need to stretch at this time. The trails I've gone to seem to be more limited by breakover height even with a flat skid which is also why I don't want to stretch too far.


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post #14 of 23 Old 07-01-2019, 09:55 AM
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Breakover angle is definitely an important thing to keep in mind. 98-100" is a pretty good goal.


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post #15 of 23 Old 07-01-2019, 10:41 AM
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I am real happy with my 102" WB and RCI 2162 behind the seat.



The only drawback for me with the fuel cell is the loss of storage. I want to lower it through the floor to the bottom of the frame, but have to figure out how to fit mufflers under there somewhere because my Flowmaster currently resides where I want my fuel cell. I have a lot of time in my exhaust to keep it out of harms way and make it fit around the drive train and suspension.




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