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post #1 of 14 Old 05-02-2011, 09:28 AM Thread Starter
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post gear install question

Spent all day yesterday changing out the ball joints and putting gears in the front end of the JK. Drove it home last light and noticed then and this A.M. that there is a slight drone that comes and goes as i am driving. Maybe its me, but i swear its there..... we didnt have time to do the rear yesterday, but the front end is all complete. Yes I know i cant engage the TC till the rear is finished .... has anyone had this, or have an idea what may be causing it? i'm not spinning the front diff, so i figure it cant be gear related ..... bearings, axle joint, hubs out and in... any other ider's ....

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post #2 of 14 Old 05-02-2011, 09:40 AM
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Unless you are 100% sure on the contact pattern, I would say the R&P are set-up wrong. A properly aligned R&P is/are quite. Double check the contact pattern. If it is right then, you are imagining it.

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post #3 of 14 Old 05-02-2011, 09:55 AM
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Did you pull the front driveshaft? If not the front gears are spinning. Although the t-case isn't engaged the front and rear outputs are spinning (if both driveshafts are in) at different speeds. You're likely to piss something off.

Does the noise come and go with the gas pedal? If so you set them up wrong. Properly installed there should be no noise.

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post #4 of 14 Old 05-02-2011, 10:15 AM
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If I had to guess id say your getting front driveline vibrations. After you do the gears your front driveline will be spinning much faster than it did before. Easy way to check is to pull the front ds and test drive. If it goes away you'll need to adjust your pinion angle. That is, if your running an aftermarket front driveline. The oem ds isn't prone to vibs.

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post #5 of 14 Old 05-02-2011, 10:17 AM
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I did my rear end first and drove for a week before doing the front end the next weekend. I did not notice any abnormal noises from the tcase.

I would agree with toymaster. Take the time to double check your contact pattern. If its set up right, you're ok.

edit: you can also pull the driveshaft to check for dl vibes.

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post #6 of 14 Old 05-02-2011, 10:24 AM Thread Starter
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thx, i'll be doing some more checking tonight

and yes, both shafts are in ..... so the gears ARE spinning now correct?

it is a stock driveline ....

it does seem to come in and change a bit with speed... dont notice it till your at highway speeds..... 45+

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Last edited by razzer; 05-02-2011 at 10:35 AM.
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post #7 of 14 Old 05-02-2011, 11:35 AM
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Quote:
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thx, i'll be doing some more checking tonight

and yes, both shafts are in ..... so the gears ARE spinning now correct?
Yes, unless you swapped out the hubs for a Spyntec manual hub kit, everything in that front axle is spinning. It just isn't powered until you go into 4wd.


This is from the faq's at randys r&p:

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What is this whirring noise?
Whirring noise only while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload, and almost never by bad ring and pinion gears.

A howl or whine during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up.

Rumbling or whirring at speeds over about 20 mph can be caused by worn carrier bearings. The noise may change while turning.

Regular clunking every few feet may indicate broken ring or pinion gears.

Banging or clunking only on corners can be caused by broken spider gears, lack of sufficient positraction lubrication, or worn positraction clutches.

Rumble while turning may indicate bad wheel bearings.

A steady vibration that increases with the vehicle’s speed can be caused by worn u-joints or an out of balance driveshaft.

Clunking only when starting to move or getting on and off the gas might be loose yokes, bad u-joints or worn transfer case or transmission parts.
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post #8 of 14 Old 05-02-2011, 11:48 AM
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did your backlash and contact pattern come out ok when you did the gears?

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post #9 of 14 Old 05-02-2011, 12:11 PM Thread Starter
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backlash was .0055 accepatble read .005-.009

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post #10 of 14 Old 05-02-2011, 12:48 PM
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Quote:
Originally Posted by JK Vick View Post
If I had to guess id say your getting front driveline vibrations. After you do the gears your front driveline will be spinning much faster than it did before. Easy way to check is to pull the front ds and test drive. If it goes away you'll need to adjust your pinion angle. That is, if your running an aftermarket front driveline. The oem ds isn't prone to vibs.
X2 Sounds like a good guess, especially if the "drone" comes in/out at a certain speed (usually somewhere around 50-60 mph).
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post #11 of 14 Old 05-02-2011, 12:55 PM Thread Starter
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X2 Sounds like a good guess, especially if the "drone" comes in/out at a certain speed (usually somewhere around 50-60 mph).
are you saying it will go away once the rear is completed?

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post #12 of 14 Old 05-02-2011, 01:06 PM
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Quote:
Originally Posted by razzer View Post
are you saying it will go away once the rear is completed?
Not at all. When you changed the gears you increased the speed the drive shaft rotates at a given speed. What have been a good pinion angle before, may now be on that causes vibration. Drive shaft vibrations usually occur at a specific drive shaft rotation speed, so will often be felt/heard at a specific speed range.

I'm not saying it is drive shaft vibration, but it easily could be. As Vick suggests, removing the front drive shaft will quickly let you know.
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post #13 of 14 Old 05-02-2011, 01:07 PM
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Having two different gear ratios in the front and rear shouldn't produce any symptoms as long as you don't use 4wheel drive. any vehicle with selectable hubs has driveshafts spinning at different speed any time it is in 2 wheel drive.

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post #14 of 14 Old 05-02-2011, 01:18 PM Thread Starter
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comprende' .... lol i will do some trouble shooting

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