loki45
NAXJA Forum User
- Location
- Albany, NY
Well, I measured on the Diff cover and the Tranny like you guys said and here's what we got:
Joint out of back of transfer case: 4*
Pinion: 9*
Joint out of back of transfer case: 4*
Pinion: 9*
Still havent figured out what you meant by this,they are all J cases except the pre-chrysler years.JNickel101 said:Same difference - point is, the J model transfer cases seem more prone to vibrations.
not the case according to Mr. WoodsRCP Phx said:The output shaft is NOT longer,the housing got shorter leaving more of the shaft unsupported!
loki45 said:Well, I measured on the Diff cover and the Tranny like you guys said and here's what we got: Joint out of back of transfer case: 4*
Pinion: 9*
loki45 said:Well, I measured on the Diff cover and the Tranny like you guys said and here's what we got: Joint out of back of transfer case: 4*
Pinion: 9*
comanche91 said:Are you talking about the u-joint working angles? If so, sounds like you have a problem here - 5* difference. Ideally, the working angle of the rear diff joint should be 1*-2* lower than the front (non-SYE), so when accelerating and the pinion comes up the working (or operating angles) of the driveshaft are nearly equal. Before you do anything, like dropping the t-case (never recommended), etc., read the driveline measurement instructions on Tom Woods' site, get an angle finder, measure your rear driveshaft slope, tranny and diff angles as compared to parallel, and calculate your u-joint working angles. Most likely your diff pinion will need to be lowered with leaf spring shims.
loki45 said:Thanks everyone. My mechanic says he can't get my 6* shims in to point the pinion down. That seem odd to anyone?
MasterShakeXJ said:i just dont see why you would need to do any sye with only 2 inches of lift? did you get an alignment after you did your lift?
6* shims for a 2" lift???
loki45 said:Tranny pan is 4.4*, Diff is 9. Driveshaft angle is 13*.
comanche91 said:I'll just ignore the previous post. :wierd:
These were my readings after a 3" lift (91 MJ LWB):
DRIVE SHAFT SLOPE: 8* DOWN
TRANSMISSION ANGLE: 6*
PINION ANGLE: 9*
Okay, if your driveshaft slope angle is 13* (seems high, mine was only 8*, but my driveshaft is a lot longer), the front u-joint operating angle is 8.6* (13 - 4.4). The rear u-joint operating angle is 4* (13 - 9). You have a 4.6* difference between the front and rear joints. You want the two u-joint operating angles close to the same, or the rear a degree lower that the front to compensate for the pinion rising up during acceleration. So if your readings are correct, I would think a 3*-4* max shim is all you'll need. Make sense?
wjp said:Tell me how you make out . I want to do a 2" lift for my 2000 cherokee. I wanted to go 2" hoping I would not get vibes, but that doen't seem to be the case. I don't want to spend the coin on an SYE.
Thanks,
Jim
garr said:I lifted my 2001 XJ 2" & had bad vibes, My Driveshaft guy recommended I try a shim before going for a SYE & DS, We tried the shims & the vibes did get better but were still very bad from around 30 to 38 MPH. I gave up & installed an HD SYE, $60 Front Driveshaft & 3* shim; All vibes are now gone!!.
MasterShakeXJ said:ive never understood the t-case drop. you lift your jeep for more ground clearance. and then lower one of the most important parts of the jeep. doesnt seem logical to me.