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Old 01-08-2017, 07:40 AM
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2 Inch Lift

Advice,

I am planning on having 2" pro comp springs put on next week on my stock 1998 TJ. I was wondering if there is any good / bad info on these, 4Wheel drive.com is installing them for me, for around $500

I had a 2000 Jeep TJ a few years ago with a 4 Inch lift , 33 " tires, just never really cared for the ride, plus as I get older, I realized I dont want to have to jump up into my vehicle every time I drive it

Thanks

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Old 01-08-2017, 09:03 AM   #2
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most dont care for procomp, but most of the ride quality will come from the shocks you are installing and what psi you have in the tires.

if I were at that stage again, i'd look at BDS 2" springs (~$230) and Rancho 5000x shocks (~$200). add some bumpstop pads (~$30) and an OME rear track bar relocation bracket (~$20)

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Old 01-08-2017, 10:16 AM   #3
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most dont care for procomp, but most of the ride quality will come from the shocks you are installing and what psi you have in the tires.

If i were at that stage again, i'd look at bds 2" springs (~$230) and rancho 5000x shocks (~$200). Add some bumpstop pads (~$30) and an ome rear track bar relocation bracket (~$20)
x2...^^^^
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Old 01-08-2017, 06:10 PM
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I was under the impression, adding a 2 inch lift, I wouldn't have to do any changes to the trac bar or pinion angle, T case lowering?

Can you confirm
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Old 01-08-2017, 06:16 PM   #5
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lifting any amount will change your driveline angles, pull your front axle to the drivers side, and your rear to the passenger side.

there are many ways to remedy these changes, motor mount lift, lopro trans mount, or TC drop for the driveline. redrilling holes, adjusting steering stops, or adj track bar for the front. relocation bracket or adjustable track bar for the rear. or you can live with the axles being off centered by ~.25".

bumpstop extensions will be based mostly on your new shocks
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Old 01-17-2017, 07:55 PM
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Quick advice on this Vibration issue

Well shit!

I had 4wd parts put on a 2" PC lift for me today, I noticed a wicked vibration above 60 miles an hour on the drive home

They mentioned it needed a new auto transmission mount, would this be causing this?

What are my options? TC lowering? How Much? 1"

Slip yoke?

I am bringing it back to them in the morning

Any advice
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Old 01-17-2017, 08:00 PM   #7
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2" shouldn't be enough to give you severe vibes that can't be fixed without massive amounts of money. Most people drop the TC skid plate down 1/4" with some grade 8 washers.

You will want to make sure that you add bump stop extensions for your new set-up. If the shop didn't (for some reason I feel like they wouldn't) then you could damage your springs and/or shocks or other things.
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Old 01-17-2017, 10:10 PM   #8
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Well shit!

I had 4wd parts put on a 2" PC lift for me today, I noticed a wicked vibration above 60 miles an hour on the drive home

They mentioned it needed a new auto transmission mount, would this be causing this?

What are my options? TC lowering? How Much? 1"

Slip yoke?

I am bringing it back to them in the morning

Any advice
Don't worry, it's likely something that can be remedied pretty easy. A bad transmission mount would normally show up under load (like if you accelerate from a stop). It could be something as simple as a bad u-joint that was marginal to begin with, but showed up with the slightly steeper driveline angle. If everything checks out okay, just have them drop the t-case skid a little as T.Wagner suggested. You do not need an sye with a 2" lift.
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Old 01-19-2017, 06:40 AM
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Do I need to worry about sway bar links?
Should I replace the one's I have and get 2" longer one's. Or does this really matter since it is only a 2" lift?

I went ahead and ordered a new tranny mount and a TC lowering kit. I might try the mount first to see if this fix's the problem, if not i will go from there.

Thanks
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Old 01-19-2017, 07:04 AM   #10
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I put a 2.5 Rough Country lift on myself a couple months ago, and i gained almost exactly 2.5", no vibrations at all, had death wobble from worn out swaybar. Your axles will be slightly ofset. i put an adjustable metalcloak track bar on the front, nothing on rear yet. Its almost a shame to lower your trasfercase for only a 2" lift, you should not have to do that at all.
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Old 01-19-2017, 09:44 AM   #11
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Do I need to worry about sway bar links?
Should I replace the one's I have and get 2" longer one's. Or does this really matter since it is only a 2" lift?

I went ahead and ordered a new tranny mount and a TC lowering kit. I might try the mount first to see if this fix's the problem, if not i will go from there.

Thanks
Seriously just try a few washers first...try 2-3 washers per bolt.

You want to keep as much belly clearance as possible... and by installing a TC lowering kit, you would be taking about 1-1.5" of belly clearance away



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Old 01-19-2017, 09:52 AM   #12
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Quote:
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Do I need to worry about sway bar links?
Should I replace the one's I have and get 2" longer one's. Or does this really matter since it is only a 2" lift?

I went ahead and ordered a new tranny mount and a TC lowering kit. I might try the mount first to see if this fix's the problem, if not i will go from there.

Thanks
You won't need a t-case lowering kit. A few washers will do just fine. You don't want to lower your t-case more than it takes to get rid of the vibes. Make sure you rule out other issues before dropping it at all. Check all drive line u-joints (front and back).
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Old 01-19-2017, 06:23 PM
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Would a bad tranny mount make this more noticeable after the 2" lift?
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Old 01-19-2017, 07:59 PM   #14
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I am also curious, what are the "symptoms" of a bad transmission mount?
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Old 01-19-2017, 08:27 PM   #15
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I am also curious, what are the "symptoms" of a bad transmission mount?
I just replaced mine after having a trans shop put a tranny in and a new mount. Whatever mount they put on, was no good. I had horrible vibes. Bad shudder on take off. Jeep vibrating quite a bit at idle. Also I was getting vibes at highway speeds. Now, no vibes.
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Old 01-19-2017, 09:29 PM   #16
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I also have a shudder at take off, but I feel like that may be due to improper gearing and my 2" lift which increased driveline angles. I'm rehearing soon though so hopefully that will solve that issue.
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Old 01-20-2017, 06:13 AM
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4WD.com people told me to use a new stock transmission mount. They said the poly mount that they sell doesn't work as well as the stock one. Something about transferring sound & vibration
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Old 01-20-2017, 10:25 AM   #18
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4WD.com people told me to use a new stock transmission mount. They said the poly mount that they sell doesn't work as well as the stock one. Something about transferring sound & vibration
Good advice...
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Old 01-22-2017, 06:53 AM
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Well I've replaced the transmission mount, both rear u-joints and lowered the transfer case by 3 washers, Although the vibration is improving, above 65 mph it very noticeable.

I have a 1" TC drop on order

Should I go ahead and replace the front u-joints as well, or maybe disconnect it and see if the vibration goes away?

Seems like a lot of work for just a 2" lift
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Old 01-22-2017, 02:58 PM   #20
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Well I've replaced the transmission mount, both rear u-joints and lowered the transfer case by 3 washers, Although the vibration is improving, above 65 mph it very noticeable.

I have a 1" TC drop on order

Should I go ahead and replace the front u-joints as well, or maybe disconnect it and see if the vibration goes away?

Seems like a lot of work for just a 2" lift
I would disconnect the front drive shaft at the axle, tape on the u-joint caps, then tie the drive shaft up out of the way, and go for a ride. If the vibes go away, pull the front shaft completely and inspect u-joints and double cardan joint on the drive shaft.

You might want to take some pics of your front springs from lower spring perch to upper and post them up. Also put a tape measure on your front springs and measure their height with the jeep sitting on the ground.
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Old 01-23-2017, 09:55 AM   #21
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I want to lift mine, but I don't want to spend the next 6 months chasing a vibration.
I've read that anything under 3 inches and you wont have vibes. Some say 2.5 inches, others say 2 inches...Looks like every Jeep is different.
Keep us informed, this info will help others down the road.
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Old 01-23-2017, 10:03 AM
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So I am wondering if they may have put on taller springs, wish I would have put a tape measure to this before I had them replaced. Any way of measuring this to verify?

Also, I think I will just go a head and replace the front u-joints, there only $15 a piece. At least I will know they are new.

I will let you know
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Old 01-23-2017, 10:20 AM   #23
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So I am wondering if they may have put on taller springs, wish I would have put a tape measure to this before I had them replaced. Any way of measuring this to verify?

Also, I think I will just go a head and replace the front u-joints, there only $15 a piece. At least I will know they are new.

I will let you know
Just measure the springs with the Jeep sitting on the ground (ride height). Stock fronts are 12", and stock rears are 8". Anything over that is lift height. Also make sure that there are no spacers installed on the tops of the springs.

I would verify that there is something wrong in the front drive shaft before replacing u-joints. If there is something wrong, it could also be the double cardan joint needs rebuilding...it would be a shame to order u-joints when it's jeeper to buy a package deal. I suggest you stick to spicer u-joints.
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Old 01-23-2017, 11:41 AM   #24
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So I am wondering if they may have put on taller springs, wish I would have put a tape measure to this before I had them replaced. Any way of measuring this to verify?

Also, I think I will just go a head and replace the front u-joints, there only $15 a piece. At least I will know they are new.

I will let you know
Sometimes 2" spring kits will measure out to closer to 2.5"...just measure as Waterdog suggested to verify.

Also a 1"MML is a much better solution than installing that T/C drop.
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Old 01-25-2017, 09:00 AM
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Dextreme, I assume this MML is a motor mount lift? Would this create any other issues? What brand? And is this hard to install

So I checked the springs out, this is indeed a 2 inch lift.
Update, I installed a 1 inch TC drop this morning before work. Ran the jeep up to 75 mph, no vibration at all.

Sucks, raising it 2 inch's only to drop the TC 1 inch

Is a SYE the only way I can resolve this issue?

Thanks again for all your help
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Old 01-25-2017, 09:09 AM   #26
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raising the motor without raising the body may cause some issues between the trans and the tub.
I would go 1" MML and a 1.25" BL

another option would be installing a lopro trans mount
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Old 01-25-2017, 09:24 AM
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Ironhead,

I am really not interested in installing a body lift, if I add the MML & the lopro mount, do you think there would be any other issues I would have to deal with?

$135.00 for Lopro, $100 for MML, Not sure if I should just save up and do the SYE and CV, that's around $500
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Old 01-25-2017, 09:29 AM   #28
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Ironhead,

I am really not interested in installing a body lift, if I add the MML & the lopro mount, do you think there would be any other issues I would have to deal with?
It is possible that with a MML and Lopro mount you could go too far in the other direction or mess up the angles of the front driveshaft and give you vibes there. Not sure how likely this is though, but with both you'd be lifting the front about 1" and lowering the back about 3/4".

Before you purchase a Lopro for $120 search the forum for DIY lopro ideas. I know people have taken their existing mounts, cut them, welded them, and dropped the TC 3/4" while still utilizing the preferred rubber mount.
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Old 01-25-2017, 09:30 AM   #29
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one or the other would do it. just not sure about your trans and the clearance with the tub.

there are many benefits to running a 1"-1.25" body lift. im on 3" front springs and 2" rears and am at 18.5" to the belly pan with the biggest trans and TC installed on a TJ. gas tank skid is raised as well
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Old 02-06-2017, 09:40 AM
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I went a head and ordered an Advanced Adapter SYE kit from Rob at quadretec, can I order the CV driveline as well, or do I have to get a measurement after the slip yoke eliminator is installed? Or can I order everything and install on the same day?

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