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Old 05-14-2009, 11:34 PM   #1
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How much transfer case drop do I need.

Well here is my problem my current setup of my jeep is like so: I have zj springs in the front with 2" inch spacers , I have a front adjustable trac bar, Rear trac bar bracket, and I have been running the stock TJ springs in the rear with 2" inch budget boost pucks with this setup the front sits a little high but I have no vibes what soever I guess I got lucky. My buddy stopped over tonight to drop off some frebbie jeep items that he did not need since he sold his jeep. Of these items were 3.5 rear lift springs so I said hell yeah and threw them in now it looks alot better but now I need a transfer case drop because I have vibes around 30-40mph. How much of a transfer case drop do I need to start with. I have looked up some transfer case drops and some are 1", 1.25 and other various sizes. For anyone that has a 3.5 to 4 inch suspension lift how much of a transfer case drop did your lift come with.

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Old 05-15-2009, 06:22 AM   #2
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I imagine other more knowledgable people will post on here after me but through my searching for kits its better to upgrade the driveshaft/sye due to the simple fact that why would you lift your jeep (to get clearance) only to lower a part of it (transfer case). But if your pimping on a budget I guess its the easy way out. My 3.5" kit was available with a 1 in drop... so I would go with that.

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Old 05-15-2009, 06:36 AM   #3
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A 1' t/c drop will do for now, but your defiantly going to wanna go with sye/cv combo for sure. I've been running a 1" drop with a re 3.5 lift and works fine until i get my sye and driveshaft
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Old 05-15-2009, 06:39 AM   #4
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The RE 3.5" kit I installed came with a 1" TC drop kit. In my case, I needed a little more so I added a couple of shims. I still get some small vibes at 35-40 but it's barely noticeable.
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Old 05-15-2009, 10:14 AM   #5
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I still get some small vibes at 35-40 but it's barely noticeable.
Trust me, they're very noticeable to your u-joints and bearings.
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Old 05-15-2009, 10:26 AM   #6
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Ive had small vibes here and there for the last 3 years with my 1inch drop and havnt had to replace anything yet. one day ill pony up for the sye and dshaft but its still working and everything is tight. even if a ujoint does bad what are they like 15bucks.
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Old 05-15-2009, 11:04 AM   #7
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Ive had small vibes here and there for the last 3 years with my 1inch drop and havnt had to replace anything yet. one day ill pony up for the sye and dshaft but its still working and everything is tight. even if a ujoint does bad what are they like 15bucks.
What's the old addage "when it breaks - upgrade it along the way?"
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Old 05-15-2009, 11:06 AM   #8
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Trust me, they're very noticeable to your u-joints and bearings.
No disagreements on that Jerry. I just need to justify my repairs (upgrade SYE, driveshaft, etc) to the "boss" when they break.

My upgrades have gone better that way.
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Old 05-15-2009, 11:07 AM   #9
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I wouldn't mind a u-joint going bad too much but I'd sure hate to have a t-case output shaft bearing or pinion bearing go bad from vibes.
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Old 05-05-2014, 04:11 PM   #10
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Hey kind of unrelated question but thought maybe you guys would be able to help me. I'm about the purchase a Tom Wood's SYE kit but in order to purchase one over the phone, they need to know some measurements...one of which is the size of transfer case drop that I have on it currently... I was a little surprised that that was a measurement they asked for but the bottom line is I need it and haven't been able to figure out a way to tell...I didn't install it obviously or I'd know but is there a way I can measure it without tearing it all apart? Sorry if this is a noob question. Just haven't been able to find a good answer online. Thanks!
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Old 05-05-2014, 04:13 PM   #11
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Look where your skid plate bolts to the frame. If there is a spacer there, that's it.
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Old 05-05-2014, 04:21 PM   #12
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Wait so all TC drops require a spacer between the frame and skid plate? I have none. The skid plate bolts right up to frame....there's no way I could have a drop that attaches directly to the frame?
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Old 05-05-2014, 04:33 PM   #13
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The ones I've used went between the frame and skid plate thus lowering the transfer case. I may have a new set for a TJ. 1" from skyjacker I think. Where you at?
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Old 05-05-2014, 04:54 PM   #14
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Well the who point is that I need to tell the shop what size TC drop I have in order to get the correct SYE kit. So this issue isn't that I need a TC drop it's more that I need to know what I've already got in order to move forward...
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Old 05-05-2014, 05:37 PM   #15
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Well the who point is that I need to tell the shop what size TC drop I have in order to get the correct SYE kit. So this issue isn't that I need a TC drop it's more that I need to know what I've already got in order to move forward...
If you don't have a tc drop at all....that's the reason you've been having vibes..!! You told us in another thread you had about 1 1/2" didn't you?

First pic= 1 1/2" tc drop (some use spacer blocks instead of bars), 2nd pic= stock (no drop), 3rd pic=high clearance skid...which do you have?
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Old 05-05-2014, 05:42 PM   #16
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No tc drop on a TJ with a lift can cause the death wobble.
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Old 05-05-2014, 05:44 PM   #17
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No tc drop on a TJ with a lift can cause the death wobble.
No...apples and oranges. Too much of a drive line angle can cause drive line vibrations. It has nothing to do with death wobble.
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Old 05-05-2014, 06:00 PM   #18
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If you don't have a tc drop at all....that's the reason you've been having vibes..!! You told us in another thread you had about 1 1/2" didn't you?

First pic= 1 1/2" tc drop (some use spacer blocks instead of bars), 2nd pic= stock (no drop), 3rd pic=high clearance skid...which do you have?
Well I'm confused if you haven't noticed lol I was told that I did have a TC drop installed with the lift...But my skid plate was definitely bolted right up to the frame with no spacers, so now I'm being told that that must mean I don't have a TC at all...crap.....
At any rate I'm a week away from ordering my SYE kit from Tom Wood's shop. Hopefully that will fix my problem!
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Old 05-05-2014, 06:06 PM   #19
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Well I'm confused if you haven't noticed lol I was told that I did have a TC drop installed with the lift...But my skid plate was definitely bolted right up to the frame with no spacers, so now I'm being told that that must mean I don't have a TC at all...crap.....
At any rate I'm a week away from ordering my SYE kit from Tom Wood's shop. Hopefully that will fix my problem!
The sye should definitely fix your drive line angle issue, and is a lot better way to go than a tc drop.
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Old 05-05-2014, 06:10 PM   #20
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Here is what my skid plate looks like right now...no washers or nothing I dunno if you can tell if I have TC drop or not by these....
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Old 05-05-2014, 06:10 PM   #21
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doesn't look like a TC drop now that I know what to look for...
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Old 05-05-2014, 06:14 PM   #22
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Do you have a motor mount lift?

Are planing on just a SYE or a super short SYE
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Old 05-05-2014, 06:15 PM   #23
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nope sure dont
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Old 05-05-2014, 06:16 PM   #24
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and I was just gonna do a SYE not a super short why do you ask?
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Old 05-05-2014, 07:12 PM   #25
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Any thing more than a hack and tap generally runs about 200 and a super short is only about another 40 to 60 so if you ever plan a tummy tuck or greater lift might want to consider the ultra short

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