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Old November 7th, 2005, 06:47 PM   #1
Saharaboy
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Question T-case Drop

When to do a drop?

I have been told both 2" and 3" as the breaking point for a drop of the t-case. I am at 2.5" and seem to think I have some drive line vibes? Should I drop it like 3/4 of an inch just to see if it helps? Also a drop jsut includes spacers to the frame and longer bolts right?

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Old November 7th, 2005, 07:00 PM   #2
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Yes all a drop involves is spacers for the skidplate to be lowered away from the frame rail. I know you are busy but before doing the drop you could always measure the driveshft angles at the case and axles on yours versus a stock one. You could then copy the angles onto graph paper and do the work of moving the top part of the triangle down 3/4 of an inch and draw the new lines, measure the angle and see if their is really any gains.

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Old November 7th, 2005, 07:11 PM   #3
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Drop kit is just spacers and longer bolts..

I have an RE 3.5" with .75" spacer up front (about 5" of lift net).. I also have a 1" MML + 1.25" BL and my t-case is not dropped.. (No SYE or CV DS) this is with a 4.0 5spd and Dana 35..

I have some vibes on hard acceleration.. but it still drives better than any other lifted Jeep .. lift has been on for about 2 years and has seen action in wellsville/yellow creek w/ 35 tires .. u-joints still seem to be fine in the d-shaft..
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Old November 7th, 2005, 07:15 PM   #4
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Ya my u-joints are fine, I just know that something is causing some small vibes, nothing I haven't driven with for awhile now anyways, but was just thinking this might help it out. But who knows, I am sure I have a dozen other issues also
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Old November 7th, 2005, 07:18 PM   #5
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On a tj 3.5" is about the limit in my opinion.
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Old November 7th, 2005, 08:59 PM   #6
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Depends on the application/configuration of the TJ. Different transmissions are different lengths. The Dana 44 has a longer snout than the Dana 35, etc..

My on 98 TJ had one of the shortest possible, with the 5 speed and the Dana 44, I think 11-12" between the U-joint caps.. I needed a 1" drop with my RE 3" lift...
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Old November 7th, 2005, 10:36 PM   #7
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I'll stop by with the angle finder one day.
takes a few minutes to fugure out how far off the angles are
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Old November 8th, 2005, 08:14 AM   #8
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Quote:
Originally Posted by Tonka
I'll stop by with the angle finder one day.
takes a few minutes to fugure out how far off the angles are

Thanks Eric
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Old November 8th, 2005, 09:04 AM   #9
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I have a 1" t-case drop kit for a TJ if you want to try it out. Come pick it up.
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Old November 8th, 2005, 03:00 PM   #10
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Quote:
Originally Posted by Jeeptj1999
On a tj 3.5" is about the limit in my opinion.

Thats about right. My first lift was about 3.5" to 4" and thats when I dropped the t-case. I did pull the spacers after a while and ran it in the stock location. It wasnt too bad but not really advised. With 2.5" you should be fine in the stock location.
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Old November 8th, 2005, 03:19 PM   #11
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Ok so any other ideas where I am getting driveline vibes??
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Old November 8th, 2005, 03:30 PM   #12
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Quote:
Originally Posted by Saharaboy
Ok so any other ideas where I am getting driveline vibes??
worn u-joint front d-shaft..
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Old November 8th, 2005, 09:52 PM   #13
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I couldnt find where mine were coming from until I pulled the front shaft. All gone. Now I just strap it up when I go on long drives and keep it hooked up to the t-case.
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Old November 9th, 2005, 05:23 PM   #14
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Dont drop the tcase... do a motor mount lift instead...
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Old November 9th, 2005, 05:29 PM   #15
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Quote:
Originally Posted by biohazardbill
Dont drop the tcase... do a motor mount lift instead...
agree, but worst case we can drop the t-case super cheap. he may only need 1/4"
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Old November 9th, 2005, 08:02 PM   #16
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Really depends on how tolerant you are of vibes. An angle vibe will really only show itself at a certain speed... or a few speeds.

if you have a vibe that shows up at a speed, and just keeps getting worse the faster you go, your looking at a bad u-joint, centering ball, or unbalanced/bent shaft.

Remember that a 1310 joint is only good for 27deg. So with a ~5" lift at full drop with a stock length driveshaft you may be near or over that. Binding equals blown up stuff :)
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Old November 10th, 2005, 01:31 AM   #17
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Quote:
Originally Posted by monkeyevil
Remember that a 1310 joint is only good for 27deg. So with a ~5" lift at full drop with a stock length driveshaft you may be near or over that. Binding equals blown up stuff :)
yeah i'm in that position myself since i lifted my rig 4.5" , XJ mind you, but yeah, u-joints binding is no good, i'm in need to drop the my t-case also at least a 1"
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Old November 10th, 2005, 01:33 AM   #18
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Quote:
Originally Posted by biohazardbill
Dont drop the tcase... do a motor mount lift instead...
how much more involved would a motor mount lift be? I'm assuming they make lift brackets already? so you would just need to lift the engin up with a crane and replace the mounts?
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