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Unread 10-27-2010, 12:01 PM   #1
alex_c
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8.8 swap - pinion angle

I'm doing an 8.8 swap on my TJ with a 2" BB, and 1" MML/BL. I tacked the brackets on with the pinion angle set at around 13-14*. I will be running an SYE and adjustable UCA's. Will this work well? I will probably go for a 3.5-4" lift in the future, so I thought that It would be wise to account for that.

Anyone running a similar setup with an 8.8, what did you set your pinion angle at?

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Unread 10-27-2010, 12:27 PM   #2
stuntjumper
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I'm having mine built now and it is set to 15deg. I'm not running adjustable UCA's or SYE and I'm about 3" suspension lift + 1" MML/BL.
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Unread 10-27-2010, 12:34 PM   #3
alex_c
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Your pinion angle should be higher with 1" more lift and a longer output shaft on the transfer case. The thing I'm worried about most is my adjustable control arms will not be short enough to bring the pinion angle down if needed.
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Unread 10-27-2010, 01:13 PM   #4
TJftw
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mine is 17 degrees with a 3.5" RE lift, works well thus far
(no SYE yet)
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Last edited by TJftw; 10-27-2010 at 01:13 PM.. Reason: additional info
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Unread 10-27-2010, 01:35 PM   #5
liredneck
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im installing mine now the pinion in as 15 and the tcase is at around 4 or 5 theres lots n lots of vibes , im waiting for my adj control arms to get here and has anyone noticed how far over to the pass the pinoin is its very noticeable on mine
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Unread 10-27-2010, 01:40 PM   #6
TJftw
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yes the pumpkin is offset about 3" to the passenger side. Every jeep is different so it's hard to say what will work. As I said before I am running a 3.5" RE lift, with the stock driveshaft. Pinion is about 17 degrees. I also have a 1" mml and a 1" t-case drop. No problems so far. I would replace the u-joints while you're under there too. Saving up for a SYE soon
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Unread 10-27-2010, 01:42 PM   #7
jawalterusmc
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Just installed mine yesterday and I noticed the same thing and I to have vibes. Funny how I missed all that on the other write ups on installing the 8.8 under a TJ. First place I turned it in to for the alignment (not off by much if any) could NOT get the correct angle on the pinion. Said they didn't have the correct tools to do it right. However they got the vibration down to a bearable amount. I'll have to try my local Off Road shop tomorrow. But I do like the feel of the 8.8...heavier, smoother ride, less bouncy on the highway. Can't wait to get the pinion angle corrected and take her off roading.
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Unread 10-27-2010, 01:44 PM   #8
TJftw
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yes it does feel different doesnt it
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Unread 10-27-2010, 02:28 PM   #9
liredneck
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jawalterusmc do you have adj control arms ? what did you do for the alignement ? are you talking in the rear or the front
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Unread 10-27-2010, 02:46 PM   #10
alex_c
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can anyone with a smaller lift and SYE chime in with the pinion angle they ended up using?
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Unread 10-27-2010, 05:24 PM   #11
alex_c
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bump?
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Unread 10-27-2010, 05:37 PM   #12
Gary2
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I set mine up for 17 degrees when welding up the brackets . I have both adjustable uppers and lowers . RC 2.5" springs with a 3/4" spacer. I think now that it is actually all mounted up it ended up being slightly less than 17 . I decided on 17 when welding it up after reading what seemed like a million articles about installing an 8.8 . worked out fine all said and done .
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Unread 10-28-2010, 05:26 AM   #13
jawalterusmc
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Quote:
Originally Posted by liredneck View Post
jawalterusmc do you have adj control arms ? what did you do for the alignement ? are you talking in the rear or the front
I have the RE 7000 4.5" lift which came with
Components
RE1142 - GEN2 DISCONNECTS 4.5"-7.5" TJ,
RE1155 - SWAY BAR END LINKS REAR TJ
RE1355 - COIL SPRINGS TJ 4.5" FRONT/PA
RE1360 - COIL SPRINGS TJ 4.5" REAR/PAI
RE1380 - BUMPSTOPS 2" FRONT LOWER
RE1385 - BUMPSTOPS 2" TJ REAR UPPER
RE1553 - BRAKE LINE SET SS FRONT 20"
RE1600 - TRACK BAR, FRONT XJ/MJ/ZJ/TJ
RE1602 - TRACK BAR BRACKET TJ REAR W/CV
RE3700 - CONTROL ARM SF2 LOWER FIXED
RE3780 - CONTROL ARM SF2 UPPER FT ADJUS
RE3783 - CONTROL ARM SF2 UPPER REAR ADJ
and later added rough country adjustable rear track bar and adjustable lower control arms.

The only thing I had to adjust when installing the 8.8 was the rear track bar. I ordered it from ECGS and it came with the TJ mounts preinstalled/welded for my lift (4-5"). Had to extend it 1/4 inch to line up with the hole in the new bracket. It drove true and wouldn't have noticed any difference if it hadn't been for the vibration from the drive shaft. They made only minute adjustments in the rear to align it and decreased most of the vibrations from the driveshaft but they didn't have any proper tools for measuring pinion angles. I'll will have to take it the local off road shop to fine tune it.
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Unread 11-17-2010, 04:29 PM   #14
alex_c
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with my 2" lift I ended up setting the pinion angle to 12*

I was able to use the stock DS, but it was pretty close to running out of slip with the axle at full bump. I now have an SYE and CV shaft in there. I would highly recommend both if you're under 2" of lift.
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Unread 11-21-2010, 09:28 PM   #15
dlloydj
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Quote:
Originally Posted by TJftw View Post
yes the pumpkin is offset about 3" to the passenger side.
Just finished my install from ECGS. Got pinion to 18 degrees, totally aligned with driveshaft, but still minor minor vibes. Could the lateral pinion angle be the cause? The DS is clearly not straight into pinion, when looking directly upwards.
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