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Old 12-28-2010, 02:02 PM   #1
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T-Case lowering

I have a 3.5" RC lift and after installing it, I noticed in 1st gear when just starting off I would get a banging that would coincidewith the shaking of the shifter. I just put on 33" tires and the banging is more frequent and louder. I dont think the with the instalation of the lift there was any attention paid to the transfer case. Does this sound like the problem? Is the lowering kit an easy install? How much should I lower it, is there a formula based on the hieght increase? Thanks

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Old 12-28-2010, 02:16 PM   #2
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most likely. the 3.5 inch lift made the driveline angles too steep and u will get vibrations from it. tcase will help correct the angles. get the tcase drop kit asap.

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Old 12-28-2010, 02:18 PM   #3
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Old 12-28-2010, 02:19 PM   #4
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what year is your wrangler
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Old 12-28-2010, 03:07 PM   #5
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Its a 97. Is the kit easy to install? I like to work on the jeep but don't possess extensive skills.
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Old 12-28-2010, 03:18 PM   #6
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I'm having the same problem with mine, its like a popping noise in rapid succession just off the line in first then it goes away. same thing?
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Old 12-28-2010, 03:21 PM   #7
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Absolutely same thing. Seems worse with the bigger tires. I also now have a metalic sound when I shut down(I should save that for a different thread though)
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Old 12-28-2010, 03:24 PM   #8
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i heard someone say that it could also be the u-joints, but the transfer case seems to fit the problem better
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Old 12-28-2010, 03:34 PM   #9
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rather than buying a tcase drop, you can also space it the same way with some washers.
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Old 12-28-2010, 03:41 PM   #10
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how many inches for the spacing?
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Old 12-28-2010, 03:42 PM   #11
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I dont know if there is an exact amount. Everyone that Ive heard that has done it just does it thru trial and error. Another option is a small BL and a MML. This eliminates the need of a TC drop
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Old 12-28-2010, 03:45 PM   #12
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dumb question, whats bl and mml?
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Old 12-28-2010, 03:50 PM   #13
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BL is a Body lift

MML is a Motor Mount lift.

A MML lift will also reduce your driveshaft angle. Im not sure if the OP and your issue is with the driveline, but if it is, a MML or TC drop should help. I prefer the BL and MML because if you ever plan on installing any sort of skid plates such as a tummy tuck or a gas skid, many of them prefer you to have a body lift in place to make installation easier.
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Old 12-28-2010, 03:53 PM   #14
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thanks for the help. i'll go to ace and get some spacers and see if it works, a little cheaper too. thanks!
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Old 12-28-2010, 03:55 PM   #15
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Not a problem. Let us know if it works out.
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Old 12-28-2010, 05:01 PM   #16
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When I did my lift 2-1/2 inch I bought 6 new bolts alittle longer for the TC drop . I also bought 60 washers . Start out with 5 per bolt and drive it some ? if it still has some Vibs add one or two or if no Vibs you can take one out ?

Something to think about is the more you drop the TC the less room you have for your shifter to go in 2-4- and R

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Old 12-28-2010, 05:35 PM   #17
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i`m having the same problem,97 4.0 auto and a rc 3.25 lift, when just starting off i get a banging noise and feel it in shifter and floor boards but cannot tell exactly where its comming from. I installed the t-case drop that came with it when we installed the kit, had it on the lift a number of times but cant figure out this noise
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Old 12-28-2010, 05:57 PM   #18
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Quote:
Originally Posted by Cons_Table View Post
BL is a Body lift

MML is a Motor Mount lift.

A MML lift will also reduce your driveshaft angle. Im not sure if the OP and your issue is with the driveline, but if it is, a MML or TC drop should help. I prefer the BL and MML because if you ever plan on installing any sort of skid plates such as a tummy tuck or a gas skid, many of them prefer you to have a body lift in place to make installation easier.
I plan on doing both, which is exactly why I did a BL & MML with my OME lift.
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Old 12-29-2010, 09:46 AM   #19
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tcase drop>mml for your issue. ill find the thread when i asked if i could take off my tcase drop kit and do a mml to alleviate the angles and was told helll no. so i would do it right and just spend the 43 bucks...is it really that much?
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Old 12-29-2010, 09:47 AM   #20
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but if you do end up doing a mml, do a 1-1.25 inch body lift at the same time so you dont have to adjust/cut the fan shroud
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Old 12-29-2010, 09:49 AM   #21
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Old 12-29-2010, 09:51 AM   #22
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In theory the MML should allow you to remove the T-case drop as it accomplishes the same thing the T-case drop does. Instead of changing the drive line angle by bringing the back down, it does the same thing by bringing the front up.

However, there's no magic see-saw pivot point right smack between the engine mounts and the T-case. You're still tied in at the skid plate, as well as the engine mounts. So raising the motor 1" inch (far away from the issue) doesn't give as much net change as lowering the drive line at the transmission (the source of the issue). The transmission can only rotate down so far when you move the engine up.

You may still need some spacers on the skid plate depending on your lift. The only way to be certain is to try it.
hope that helps
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Old 12-29-2010, 09:40 PM   #23
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The only way to fix the problem (TC lowering is only a band aid) is to put in a SYE which allows the use of a longer drive shaft that can handle the sharper angle the lift adds. More expensive but in the long run it will work much better and saves stress on the drivetrain.
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Old 12-30-2010, 09:42 AM   #24
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Old 12-30-2010, 09:54 AM   #25
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guys, I have the same problem, but I don't think it is the u-joints/drive line angle. I have a 2" suspension lift and I didn't have the problem until I put the 1" body lift on. I have a 98 4.0 stick, and if I let the clutch out slowly I don't get the banging noise. But if I let the clutch out quickly I do get it. I don't see how it could be related to the u-joints if I didn't change my suspension lift and I can control the noise by how fast I let the clutch out. I always thought it was something hitting the tub since I did the body lift.

Also, I had drive line vibrations in a previous Jeep and this banging noise is def. not a typical drive line noise. It is a sharp bang or a few seconds right from a stop.
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Old 12-30-2010, 10:10 AM   #26
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Well here is a word of caution. I went to the store and bought grade 8 bolts 2.5x1/2 and 30 grade 8 washers. I took off the driver side bolts(after a lot of PB blaster) and lowered my jack enough to get the washers on. Piece of cake. The other side I got all three bolts to just spin in place. I must have broken the weld on the nutcerts in the frame. Now I have one side lowered and one side I cant tighten or loosen. My nice easy drop t-case project has turned into a nightmare since I dont have a welder, a impact wrench, or the aptitude to use them. There is a great thread on how to install new nutcerts, but my dealer has to order them, and getting the old ones out looks like a huge project in itself. My frustration level is through the roof.
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Old 12-30-2010, 10:33 AM   #27
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I forgot to add that I tried spacing my t-case down with washers and it had no effect on the banging noise. I spaced it down about 3/4 of an inch, then just put it back to stock since there was no difference in the banging noise or drivability. I didn't have vibs before while driving, so the washers weren't any use.
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Old 12-30-2010, 11:02 AM   #28
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are you getting the vibes only after shifting into first gear from a stop? if so, your control arms might be loose
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Old 12-30-2010, 01:54 PM   #29
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I get the noise right when I take off from a stop in first gear, but shifting into first from neutral while stopped is not a problem. It is fine when I am stopped, but it bangs for 1-2 seconds right when i take off. I have checked my drivetrain for loose bolts, control arms, etc... The noise sounds like it is coming from the transmission tunnel. I assumed it was something hitting the tub since I did the body lift, but I was interested to hear that other guys have the same noise after doing suspension lifts.

Also, since it doesn't happen when I let the clutch out slowly, I thought it might have something to do with the engine rocking back and forth on start up. Maybe I (and others) have a bad trans mount, or motor mount. I have been meaning to check the trans mount to the skid plate but its so damn cold out now that I don't want to be laying under my jeep haha.
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Old 12-30-2010, 01:56 PM   #30
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I will try to video it tonight with my phone and post a link so you guys can hear it.

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