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Topic Review (Newest First)
03-25-2013 08:47 PM
WVU Mountainman Brown dog MML installed. Driveline vibes are gone! Going to remove my TC skid drop tomorrow and see what happens.

Not too difficult to install but still took 4 hours to complete. Gotta notch the fan shroud and reinstall my puke jug in the AM.
03-14-2013 01:00 PM
WVU Mountainman Got it now. Thank you
03-14-2013 12:53 PM
wwch99tj No

A 1" coil spacer will push the suspension further away from the frame.

A mml will lift the engine up 1" (at the fan) up out of the frame.
03-14-2013 12:24 PM
WVU Mountainman I'm still confused, someone please explain how a 1" motor mount lit will not work the same as 1"spring spacers in the front. Won't the motor raise an inch with the spring spacers what am I missing? I'm not being stubborn I just don't understand?
03-13-2013 02:41 PM
WVU Mountainman Pretty sure I was measuring wrong. I put my phone on the slanted bottom piece of the differential. I realized this slants at different angles. I put my phone on the uj pint pushed up against the differential and got a much better reading. Only off by 3 degrees now
03-13-2013 02:34 PM
Patrick H The best way is SYE, DC shaft, adjustable rear uppers, and angled track bar bracket.
If I were in your position and wasn't ready for a SYE (and I am/ was) I'd install the MML and measure again and go from there. I understand that a MML doesn't require a body lift, but you might want to verify.
03-13-2013 01:46 PM
WVU Mountainman So my only options are as follows correct....

DC driveshaft with sye
MML with TC drop
Adjustable upper rear CA's

Any other options? How far can you drop the TC skid without causing issues?
03-13-2013 12:51 PM
WVU Mountainman Thanks guys. I put off the springs for a long time because I was worried about this issue. Now I'm living it. I have MML ordered and will try this once I get it. Ill add weight to the back until vibes go away until I can fix correclty
03-13-2013 12:44 PM
Patrick H
Quote:
Originally Posted by WVU Mountainman
Will adding weight to the rear affect driveline angles?
Yes.
03-13-2013 12:43 PM
Patrick H
Quote:
Originally Posted by WVU Mountainman
Also I did not install a rear trackbar relocation bracket. Will this affect driveline angles
No
03-13-2013 12:41 PM
IslandTJ If you must drive your Jeep, I would keep an eye on your pinion seal on your diff for oil weeping. If you do see oil, I'd recommend resolving the vibe ASAP.
03-13-2013 12:41 PM
WVU Mountainman Also I did not install a rear trackbar relocation bracket. Will this affect driveline angles
03-13-2013 12:40 PM
WVU Mountainman Will adding weight to the rear affect driveline angles?
03-13-2013 12:31 PM
Patrick H I personally won't drive mine if the angles are far enough out to cause even the slightest detectable vibration.
03-13-2013 12:29 PM
WVU Mountainman Is this a normal issue with 2" lift? Will the springs settle at all? Will it hurt anything driving as is for a while?
03-13-2013 12:29 PM
Patrick H And yes, SYE is in my future, but I wanted my drive line angles to be correct in the mean time. I did have to end up leaving about 1/2" drop on the skid. It's the best I could do until either the money tree blooms or I quit feeding my family.
03-13-2013 12:23 PM
Patrick H You won't get 5 degrees with a MML., but it'll get you closer. I welded in some offset plates in the rear upper control arm mounts on the axle to push the pinion sown a bit, and lengthened the lower control arms a bit. With a mml, I was able to match the pinion and transfer case shafts, and still keep thE rear diff. out of the fuel tank at full bump.
03-13-2013 12:19 PM
IslandTJ
Quote:
Originally Posted by WVU Mountainman View Post
Do you think a MML will solve the problem?
Hard to say with a 5 degree difference. However, if we were to pursue resolution starting with the least costly mod, a MML lift should be considered and if that doesn't work the pinion angle may be dialed down with adjustable control arms.

Best case fix would be the SYE route...
03-13-2013 12:12 PM
WVU Mountainman Best I could with my I phone app. TC output 11 degrees pinion angle 16. Keep in mid this is after dropping the TC skid 1".
03-13-2013 11:56 AM
Patrick H
Quote:
Originally Posted by WVU Mountainman
Do you think a MML will solve the problem?
Did you measure the output and pinion shafts?
03-13-2013 11:47 AM
WVU Mountainman Do you think a MML will solve the problem?
03-13-2013 11:39 AM
IslandTJ It appears your pinion is too high, it needs to be parallel with the transfer case output shaft.

Would actually be spot on if you had a DC driveshaft
03-13-2013 11:34 AM
WVU Mountainman Gotcha. Thank you. I've been racking my brain on this. Mi driveshaft angle is 12 degrees looks good but still wobbles on take off. Here are some pictures
03-13-2013 07:45 AM
Patrick H
Quote:
Originally Posted by WVU Mountainman View Post
Then how does installing taller springs affect driveline angles?
By moving the axle away from the frame, or more to the point, moving the pinion shaft away from the transfer case output shaft.
But moving the front axle does not affect the rear axle.
03-13-2013 07:43 AM
WVU Mountainman Then how does installing taller springs affect driveline angles?
03-13-2013 07:42 AM
Patrick H
Quote:
Originally Posted by ronb256 View Post
The reason it own't work with the spacers is that you would only be changing the body to frame angle, not the engine or differential to frame angle. Good catch Patrick. I had to think about that for a moment, maybe because it is almost the end of night shift.

Putting spring spacers on the front springs, or anywhere, does not change the way the body attaches to the frame.
03-13-2013 05:07 AM
ronb256
Quote:
Originally Posted by Patrick H View Post
Absolutely not. If that were the case, your rear drive shaft angle would change when you drove up hill. You have to change the relation between the rear axle and the frame, or the engine/ transmission/ transfer case and the frame to change drive line angles.
The reason it own't work with the spacers is that you would only be changing the body to frame angle, not the engine or differential to frame angle. Good catch Patrick. I had to think about that for a moment, maybe because it is almost the end of night shift.
03-12-2013 04:50 PM
Pink_Percy
Quote:
Originally Posted by wwch99tj View Post

I see everyone posts don't do both sides at once. It took me 30-45 mins to put mine on doing both at once, I jacked the motor from the oil pan near the harmonic balancer. Didn't have any problems...
I'm with you on this one. Took me 45 minutes to install a mml. So much easier at the same time.
03-12-2013 04:48 PM
Patrick H If I were you, I'd start by actually measuring the angles on your rear drive line as I posted above so you know exactly what needs to change, and how much.
That said, a MML will help.
03-12-2013 04:45 PM
Patrick H
Quote:
Originally Posted by WVU Mountainman View Post
After it was all said and done i dropped the TC 1" 48 grade 8 washes total. Still wobbles on take off. With the 2" lift I have what appears to be a steep rake rear to front. I purchased some .75" spacers for the front. In theory Will raising the front better my driveline angle and reduce driveline vibes?
Absolutely not. If that were the case, your rear drive shaft angle would change when you drove up hill. You have to change the relation between the rear axle and the frame, or the engine/ transmission/ transfer case and the frame to change drive line angles.
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