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Old 02-18-2013, 01:26 AM   #1
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So I put in new axles this weekend, an hp30 and a trussed Dana 44. Both are built with alloy USA chromoly shafts, newer 4.56 gears and rebuilt ARB lockers.
Front axle has the teraflex steering kit and rear has the teraflex disk brake kit.
We cut the axle brackets off my 35 and used them on the 44. We also tossed on an sye and cv driveshaft in the rear.
Something in the drivetrain is causing vibrations primarily between 10 and 35 mph or so... Seems to be directly under the cab but difficult to be sure. Pinion angle isn't great in the rear and front shaft is slightly off from stock as we went from lp30 to hp30 on the stock front shaft. I need to get adjustable control arms ASAP. Also, despite careful measurements, the rear axle isn't lining up and seems to be 1/2" off center. I may try an adjustable track bar but not sure this option is going to work. Shocks need replacing ASAP as well.

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Old 02-18-2013, 01:32 AM   #2
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I was astonished how worn many of the bolts are in the rear suspension..... 30+% of the metal was worn away!

Lastly, and most importantly, when I finally was making it home, it started to make a bad binding noise when the vehicle was in gear but the throttle was let up on, or coasting.... Much like I was downshifting and engine braking..... T case and tranny fluid was changed today as diff fluid is fresh.... I want to drop the belly skid and check them again tomorrow as I'm afraid to drive it now.

Anyone have any ideas?

Regardless, it was a ton of work done in 2 days. Once these issues get tweaked and fine tuned, this will be a tremendous vehicle for me to get into the sport with! Naturally my rear main sprung a decent leak let the headaches begin!

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Old 02-18-2013, 08:02 PM   #3
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Offhand I'd say you better get the pinon angles corrected asp. That is causing the vibration and possibly the binding if they're way off.

Cutting off brackets and welding them back they are probably going to be off to some extent. How much lift do you have? If it's in the three to four inch range you might get by with a track bar mount extension. The adjustable track bar is the only sure thing.
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Old 02-18-2013, 08:49 PM   #4
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I agree the pinion angle would be a good place to start. If its far off it will cause vibes and ugly noises...ask me how I know.
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Old 02-18-2013, 09:13 PM   #5
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thank you both. I picked up adjustable rear upper control arms today (scored used at specialized 4x4 by my house for 120.00 with new bushings pushed in while I waited).

I ordered the tie rod boots for the teraflex steering kit as one looked pretty rough. I also ordered some new ebrake cables for the rear from them. The final fitting arrived for the front arb. I may get motivated and go run the airline tonight outside, or hold off and take care of it tomorrow.

I'm hoping to get a chance to put the arms on and get that pinion angle set properly in the next couple days. Once John get's over his cold I'll shoot over an do it in his garage. Sitting in the snow outside doesn't sound like an ideal setting for fine tuning and pulling rear end components :/

I'm hoping that resolves it! However, I'm sure there will be a bit more tweaking that hopefully can be worked out in a day my next trip to rifle and allow a little spur trip to Moab!
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Old 02-18-2013, 09:22 PM   #6
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Quote:
Originally Posted by Oldguy View Post
Offhand I'd say you better get the pinon angles corrected asp. That is causing the vibration and possibly the binding if they're way off.

Cutting off brackets and welding them back they are probably going to be off to some extent. How much lift do you have? If it's in the three to four inch range you might get by with a track bar mount extension. The adjustable track bar is the only sure thing.
I have a 4 inch suspension lift. No body lift.
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Old 02-18-2013, 09:53 PM   #7
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Well, four inch lift and a stock track bar mount on the axle will throw your axle off about a half inch to the right. So either an extension on the mount or an adjustable track bar, take your pick.
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Old 02-18-2013, 10:29 PM   #8
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Damn Ed, you're good! Axle is 1/2" off center pushed out to passenger!!!! It's strange as the jeep had the same track bar on the 35 and it was centered..... Not sure if its the factory one or not... Either way, adjustable will be ordered in the next few days. I'll try and source one used first.

Side note, if anyone has a used rear adjustable track ba, I'd love to buy it. Please pm me!
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Old 02-19-2013, 07:59 PM   #9
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Update: Adjustable trackbar ordered.

I got under the jeep today when I attached the front ARB air line and sealed up a few not so air tight solenoids and pressure switch (I was afraid of cracking the housing).... the rear axle pinion has a bit of play that I think is the root of the horrible noise I mentioned before.

Is there a way to tighten that yoke temporarily? It seemed tight when it went into the jeep this weekend. I wonder if the vibrations for the last 150-200 miles destroyed the bearings?

I'm going to avoid driving it until at very least I can get the rear adjustable control arms in and correct the pinion angle to minimize further trauma....

Naturally I found an insane deal on some king coilover take offs..... decided to get this running properly before cutting it up more .
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Old 02-19-2013, 08:37 PM   #10
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Is the yoke on the pinon shaft loose or is it the pinon shaft itself that is moving around?
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Old 02-19-2013, 09:03 PM   #11
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Ed- Not sure. I will have to pull the driveshaft off to check. As I don't have a garage, I didn't do that today. It was cold as hell outside laying on my back in the snow under my jeep in Breckenridge!!! If it's just the yoke that's lose, it seems like I could disconnect the driveshaft, pull the yoke, replace the pinion seal, and torque the shit out of the pinion nut/bolt? If I disconnect the driveshaft, do you think i'll be able to tell if the yoke itself is loose vs the entire assembly?
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Old 02-19-2013, 09:27 PM   #12
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With the driveshaft disconnected you should be able to feel if the yoke is loose. Did you torque it to the full spec? I think it's 180 lbs. If it's not tightened all the way it could create play in the pinon shaft. Probably try tightening the nut again and see how it behaves.
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Old 02-19-2013, 09:53 PM   #13
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I didn't do anything to the yoke. First axle swap for me haha. I'll get on checking that ASAP! I'm praying that fixes it!

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