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Old 04-28-2012, 07:42 AM   #1
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8.8 swap pinion angle question

project for the day is getting all the brackets welded on the 8.8. so i want to be sure to get the Pinion angle right and was wondering what some of you guys did.
I have a 3.5" lift with a 1.25 BL. 1" MML and want do a high clearance "tummy tuck" in the very near future.
seems like I read somewhere that it should be around 15 Degrees but I 'm not sure on that... please help.
thanks, Chad

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Old 04-28-2012, 07:51 AM   #2
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I just cheked the stock D35 and it is at 17 degrees... should I stay with that?

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Old 04-28-2012, 07:53 AM   #3
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the best way is to put the axle in position under the vehicle.

measure the ride height now...distance between axle tube and frame on both sides. pull the D35 out and throw the 8.8 under there with bare tubes. rotate so the pinion is lined up, and the axle is approximately at ride height. tack the spring buckets on, line up the bumpstops at full bump, shorten your uppers to ~15", and lowers to ~15.75", tack the brackets on. Cycle the axle and make sure it clears everything. Make sure you can line up the pinion at your ride height with the arm length you have. Cycle again to make sure you haven't pushed the axle back too far back/forward. If you have, cut the tacks loose and reposition the brackets as needed. Repeat as necessary. Once you're happy with it, pull the axle out and weld the brackets on.

Quote:
Originally Posted by Colo-TJ View Post
I just cheked the stock D35 and it is at 17 degrees... should I stay with that?
if you were installing the axle in a stock vehicle, maybe. the big problem I have with 17 degrees is what's that with respect to?

get the axle under there and go from there. leave plenty of adjust-ability in the arms so you can account for your mods later.
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Old 04-28-2012, 07:57 AM   #4
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I ended up with 17 in mine. Plans were 2.5" lift, completely flat tt.
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Old 04-28-2012, 08:00 AM   #5
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Only one problem here. I am doing this work away from my Jeep. I have to use a freinds shop and am going to weld it all up....then have it geared and locked....then install it.. I have to do this whole thing as a process .
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Old 04-28-2012, 08:02 AM   #6
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Quote:
Originally Posted by IndyJeepMan View Post
I ended up with 17 in mine. Plans were 2.5" lift, completely flat tt.
everything work out OK??
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Old 04-28-2012, 08:16 AM   #7
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Quote:
Originally Posted by Colo-TJ View Post
Only one problem here. I am doing this work away from my Jeep. I have to use a freinds shop and am going to weld it all up....then have it geared and locked....then install it.. I have to do this whole thing as a process .
you can use super glue and tape to position the brackets...then take it your friends shop to weld it. the welding heat will burn super glue off pretty quick. or just use a marker and line up your marks. or just weld them on wherever and hope for the best.
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Old 04-28-2012, 11:18 AM   #8
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Quote:
Originally Posted by Colo-TJ
everything work out OK??
Theres quite a bit of adjustability in control arms so if its not perfect, you can make it such. Like you, I had to do mine away from the Jeep. But everything im sure is going to line up fine.
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Old 04-30-2012, 11:54 AM   #9
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Well since I couldnt have averything ready to go i decided to just put the truss and brackets together and Weld some small tacks in order to hold everything till I dryfit.. I won't be pulling th D35 untill I get the front regeared and have all my ducks in a row. New Control arms ect... looking at another month or so... I just can't have my rig down for more than a week when spring has sprung. It is now officially Fun Season so that means go time every weekend if possible. I'll update when i get it together and want to say thanks to you guys for your input.
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Old 05-01-2012, 06:58 AM   #10
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...... I am doing an 8.8 axle swap also and i wasnt able to check the D35 pinion angle before i removed and destroyed it,i checked the angle on the output shaft on the transfer case and its at 9*. so will i be all good setting the 8.8 at 9* also?
i am using stock control arms and putting on a 2.5" spring lift with new shocks.
thanks and sorry for the high jack

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