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Old 09-03-2013, 02:39 PM   #1
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New guy to forum with lift questions

I'm new to the forum. And looking to other jeep owners for help I have 90 yj looking to lift just thinking RC 4in I don't go a lot of off road most to my hunting spots or fishing spots. So what all will I need to get? I know the kit and a rear slip yoke eliminator. What else? Any help would be great thanks.

Here's few pictures from last season

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Old 09-03-2013, 03:30 PM   #2
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4" lifts are iffy per your Jeep. Some you don't need the SYE just rear axle shims and a TC drop. Some Jeeps the SYE is a must. But along with the SYE will come a new rear drive shaft. You'll be able to fit 33" tires with no trimming. You can also do a shackle lift I suggest no more than 1" and a 1" body lift. If you don't do serious off roading and its just a get to the stand rig. Then you can save $ and time with just the shackle and key lifts. These are just options for you to choose from.

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Old 09-03-2013, 03:37 PM   #3
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Quote:
Originally Posted by Johnson731 View Post
I'm new to the forum. And looking to other jeep owners for help I have 90 yj looking to lift just thinking RC 4in I don't go a lot of off road most to my hunting spots or fishing spots. So what all will I need to get? I know the kit and a rear slip yoke eliminator. What else? Any help would be great thanks.

Here's few pictures from last season
Looks like the freezer is full, nice!!

In my opinion a 4" would do you good and as previously mentioned you could probably get away with not having to use a SYE at 4". I ran the 4.5" rubicon express lift with a t-case drop on my last YJ and never had driveline angle issues.
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Old 09-03-2013, 03:54 PM   #4
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It's weird how some guys with 2.5 lift have severe driveline vibrations and some with 4in have nothing. I suppose it all depends on how you drive and the setup of the rig.

Do you need 4in of lift? Are you going for function or a lifted look (nothing wrong with that)? Are you planning on bigger tires?
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Old 09-03-2013, 09:25 PM   #5
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I would like function and look I'd like to clear 33s nice. I was thinking the RC 4 with maybe 1in body. How much will I need to have added to my drive shafts?
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Old 09-03-2013, 09:57 PM   #6
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Body lift doesn't affect driveshaft length. Your driveshaft may be fine if you add a TC drop and set your angles right with shims, I would imagine you woud need beteen 4 to 6 degree shims with that lift. If this is a daily driver you may consider something other than RC for a lift, I'd check out a Zone 4" lift for a nicer ride while keeping in a budget.
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Old 09-03-2013, 10:06 PM   #7
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Body lift doesn't affect driveshaft length. Your driveshaft may be fine if you add a TC drop and set your angles right with shims, I would imagine you woud need beteen 4 to 6 degree shims with that lift. If this is a daily driver you may consider something other than RC for a lift, I'd check out a Zone 4" lift for a nicer ride while keeping in a budget.
Okay what do you mean my shims? Sorry be my first lift myself everything else I've had was already done
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Old 09-03-2013, 10:25 PM   #8
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Shims go on top of your rear springs, the thick end goes towards the front of the jeep and they change the angle which your differential points at your transfer case. They come in different thickness/degree angle, normal would be from 3 degree to 6. Many lift kits include them, if not they can be bought pretty cheap.
Forgot to add, the center pin holding the leafs together holds the shim on top, you'll need a long enough center pin to go through, and use clamps to keep the leafs together while changing out the shims.
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Old 09-03-2013, 10:37 PM   #9
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Shims go on top of your rear springs, the thick end goes towards the front of the jeep and they change the angle which your differential points at your transfer case. They come in different thickness/degree angle, normal would be from 3 degree to 6. Many lift kits include them, if not they can be bought pretty cheap.
That angle is called your caster angle. On taller lifts it may also be important for your steering response to put them on the front axle as well.

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In this picture, left is forward. The angle is the red line vs the right angle to the ground. It shows a good positive angle (if a little high for a jeep).

The caster angle is the angle your axle is to the ground. A lower angle means it will be harder for the vehicle to naturally return to going straight. A really low or negative angle gives you the "death wobbles".
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Old 09-03-2013, 11:15 PM   #10
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Here is another idea requires some welding but its what I am going to do in the future its 5 and a half inches. Rusty's YJ Wrangler Spring Over Axle Kit - YJ Wrangler ('87-'95) - Jeep Suspension Lift Kits - Jeep Suspension
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Old 09-04-2013, 08:53 AM   #11
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Here is another idea requires some welding but its what I am going to do in the future its 5 and a half inches. Rusty's YJ Wrangler Spring Over Axle Kit - YJ Wrangler ('87-'95) - Jeep Suspension Lift Kits - Jeep Suspension
SOA gives some amazing flex, and allows you to set the caster angle, since you weld on the perches yourself. It does require custom driveshafts, of course. If mine wasn't a DD, I would have gone with SOA.
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Old 09-04-2013, 12:05 PM   #12
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I agree if it was a dd I'd love to do it
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Old 09-04-2013, 07:35 PM   #13
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I did the RC 4" lift. It comes with a transfer case drop kit. I didnt need an SYE with it, no vibrations at all. And u can easily fit 33's under it.
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Old 09-04-2013, 09:15 PM   #14
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May I suggest the rubicon express 4.5" springs?
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Old 09-04-2013, 10:40 PM   #15
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Welcome! I guess figuring out what tire size you want would be the best first thing to do.

Considerations... You stated offroading is not primary so I would guess it would be dd.

What engine and trans do you have? What gear ratio do you have.

If your just gonna run 31's a 1" shackle lift, 1" body lift and some tj flares would do fine.

If you want to run 35's your looking at a lot bigger list, gears, better rear axle, extreme body mods, etc.

Tell us a tire size and motor/trans we could help more.
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Old 09-05-2013, 03:51 PM   #16
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I've got the 4.2 ax15 stock rear ends would like 33s. Plan on doing a 4.0 swap and a 8.8 rear end down the road. Already have everything for the swap just need the time.
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Old 09-05-2013, 04:02 PM   #17
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To the OP: if all that you are wanting to fit is 33s why not just do a 1" shackle, 1.25" body lift and pick up a set of tj flares off of Craigslist. Won't be as tall as a 4" lift with 33s but will be a lot cheaper in the end without having to worry about the possibility of having to run a SYE.
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Old 09-05-2013, 05:37 PM   #18
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To the OP: if all that you are wanting to fit is 33s why not just do a 1" shackle, 1.25" body lift and pick up a set of tj flares off of Craigslist. Won't be as tall as a 4" lift with 33s but will be a lot cheaper in the end without having to worry about the possibility of having to run a SYE.
A 1.25" bl and 1" shackle might rub under flex with just tj flares. If you ran long enough bump stops it would be ok to keep the tires off the fenders.

I would rub with 32's and a 1" bl and 1" shackle with quite a bit of metal cut out and the yj flares raised over an inch and trimmed way off.
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Old 09-05-2013, 08:34 PM   #19
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Thanks everyone for the in put and help

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