8.8 Pinion Angle - JeepForum.com
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post #1 of 30 Old 03-09-2019, 12:10 AM Thread Starter
disarm6565
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8.8 Pinion Angle

After lots of reading, calculating, and planning, I overshot the pinion angle when doing my 8.8 swap. I think I'm at 17 degrees instead of 15 with a 4" RE lift. I haven't driven it yet, but it looks like my driveshaft is going to bind slightly on the bottom, I can take pictures tomorrow.

There are three solutions at three different price ranges, just trying to get opinions.

1. Drive Jeep in 4wd with the front D/S connected (Only) and go to a shop for $200-$250 to have the perches re-welded correctly.
2. Shorten the D/S by 1/2" so it doesn't bind.
3. Cheapest and Easiest, install 2 degree perch shims, going the opposite way to bring the pinion angle down.

I don't mind spending the money to get it welded properly, but if it severe overkill, which I tend to do with everything the Jeep comes in contact with, I want to know if there's a simpler, cheaper, easiest way to fix my mess up.


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post #2 of 30 Old 03-09-2019, 02:04 AM
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I did shims for my lift (Dana 35 axle), no vibes and it seems to work well.
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post #3 of 30 Old 03-09-2019, 05:01 AM
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Shim it down for now. Cheap and easy.

Until you're ready to get it done properly cash-wise. I overshot mine as well on my most recent 8.8 install. (I also had 2 degree shims laying around in my storage locker for about 5 years).

I chose to shim it down a few degrees because I plan on a tummy tuck in the not too distant future and the extra angle looks as though it will work in favour to the tummy tuck.

Stop whining about the 'ride' - If your YJ ain't wrangling your soul free, then might I suggest you buy a stationwagon... at least you can fit all your bull**** in the back.
~YJOTM MAY '16~
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post #4 of 30 Old 03-09-2019, 05:02 AM
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Ideally I'd want less than 1 degree but I'd probably drive it first and see if there are any vibrations before continuing further. 2 degrees isn't a ton so if there are no vibrations, drive for a little while and let the springs settle.

Did you do an SYE or just transfer case drop?


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post #5 of 30 Old 03-09-2019, 06:16 AM
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Quote:
Originally Posted by disarm6565 View Post
1. Drive Jeep in 4wd with the front D/S connected (Only) and go to a shop for $200-$250 to have the perches re-welded correctly.
Side suggestion... If you're getting axle swap deep into Jeeping, it's time to buy a welder.
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post #6 of 30 Old 03-09-2019, 06:48 AM Thread Starter
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Quote:
Originally Posted by bruinjeeper View Post
Shim it down for now. Cheap and easy.

Until you're ready to get it done properly cash-wise. I overshot mine as well on my most recent 8.8 install. (I also had 2 degree shims laying around in my storage locker for about 5 years).

I chose to shim it down a few degrees because I plan on a tummy tuck in the not too distant future and the extra angle looks as though it will work in favour to the tummy tuck.
My first reaction was "Well, I guess I need to lift it another inch or two."
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post #7 of 30 Old 03-09-2019, 06:50 AM Thread Starter
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Quote:
Originally Posted by JeeperDon View Post
Side suggestion... If you're getting axle swap deep into Jeeping, it's time to buy a welder.
I was going to buy a welder when I started the restore and this was going to be my first major project. Since it took three years and I'm moving from TX to CO this year, I decided against it. In retrospect, I could've put that $260 I just blew towards a cheap MIG. Oh well, you live you learn.

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post #8 of 30 Old 03-09-2019, 08:09 AM
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Just buy a cheaper flux core welder, set it to max, and weld all sides of the perch. I bought my first one for $90 off Amazon and it worked fine. I only upgraded because I didn't trust a cheap welder to weld up a roll cage. Sell it later if you don't want to move it and/or if you'd prefer something more powerful and refined.

That said, I'd personally run shims for now if I was in your shoes. They aren't that big of a deal and if you lift it more or do a tummy tuck later, you won't need to reweld. If you do a SOA later, all of this won't even matter.


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post #9 of 30 Old 03-09-2019, 05:41 PM Thread Starter
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Here's some pics of my driveshaft




I'll probably just shim it if I have vibes. I may do a tummy tuck at some point, but if Shims are really no big deal, it seems a little wasteful to have it re-welded.

Another question. I had the shock mounts welded flush with the axle. I bought the M.O.R.E. Upper Shock mount relocation brackets, they arrive on Monday. I may or may not install these. It seems like the stock 8.8 shock mount on the U Bolt plate doesn't sit any lower than the U Bolts themselves. If I decide to use the stock location instead of the new welded mount, the two won't interfere with each other, correct? Like if the shock is not physically touching the unused lower mount when bolted to U Bolt plate and the Upper mount when on level ground, then it won't when it flexes either?



If not I can grind them off, but I kind of want to leave them in case I do a U Bolt flip or something else down the road.

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post #10 of 30 Old 03-09-2019, 07:50 PM
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you need this ..... oh the horror of the U bolts hanging down...

https://www.jeepforum.com/forum/f12/...-20-a-2516530/
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post #11 of 30 Old 03-09-2019, 08:45 PM Thread Starter
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I need that for every time I've hit my head on one of those pointy little buggers alone. Too bad I just paid 40 bucks for new U bolts... Hint: They're round, not square.

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post #12 of 30 Old 03-10-2019, 07:07 AM
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Ummm I'm not sure why you're taking close ups of the double cardan joint. That's the joint that's supposed to be angled. The joint coming out of the axle is the one that's supposed to be straight.


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post #13 of 30 Old 03-10-2019, 07:22 AM
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You welded the perches on the wrong side.
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post #14 of 30 Old 03-10-2019, 10:29 AM Thread Starter
disarm6565
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Quote:
Originally Posted by JeeperDon View Post
You welded the perches on the wrong side.
I can't tell if you're joking or not. I'm SUA, perches go on the bottom, no? Passenger side tube is shorter than Driver side. I don't understand.

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post #15 of 30 Old 03-10-2019, 01:17 PM
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Quote:
Originally Posted by JeeperDon View Post
Side suggestion... If you're getting axle swap deep into Jeeping, it's time to buy a welder.
And take a welding class at a local adult ed, community college.... something.
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If you cannot fix it with a hammer then it has to be an electrical problem.
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