Thread: Grinding/vibrating sound

I dont suppose the front shaft is rubbing on the chassis crossmember under it?
I know they can get close esp. if the springs are fairly high.

Nope. Had that problem with the rear. Chopped out some of the cross member. Front is fine

1. Make absolutely sure that front wheel drive is disengaging! It could be a symptom that front wheel drive is engaged.

2. Check that the sliding joint is not binding or running out of movement (This could happen if the front axle is out of place due to a broken spring leaf or centrebolt).

3. If the problem does not occur when the front prop shaft is off, did you try it with the front prop shaft off but front wheel drive engaged?

4. The only part of the transfer case that is associated with the front drive and not the rear drive is the front bearing. try disconnecting the front shaft and check this for free play or roughness by turning by hand. There should be neither appreciable free play nor any discernible roughness.

5. If all the above is negative, I would look for a problem in the front axle. Again, with the front axle on stands, check for any feeling of roughness when the wheels are spun. Could be a noisy bearing (pinion, side bearings, inner side of axle U-joint, wheel bearings) and the sound being carried up the prop shaft.

Hope this helps

John

Originally Posted by JDNSW

1. Make absolutely sure that front wheel drive is disengaging! It could be a symptom that front wheel drive is engaged.

2. Check that the sliding joint is not binding or running out of movement (This could happen if the front axle is out of place due to a broken spring leaf or centrebolt).

3. If the problem does not occur when the front prop shaft is off, did you try it with the front prop shaft off but front wheel drive engaged?

4. The only part of the transfer case that is associated with the front drive and not the rear drive is the front bearing. try disconnecting the front shaft and check this for free play or roughness by turning by hand. There should be neither appreciable free play nor any discernible roughness.

5. If all the above is negative, I would look for a problem in the front axle. Again, with the front axle on stands, check for any feeling of roughness when the wheels are spun. Could be a noisy bearing (pinion, side bearings, inner side of axle U-joint, wheel bearings) and the sound being carried up the prop shaft.

Hope this helps

John

It is disengaging properly. I think I noticed sounds while fwd was engaged and propshaft off. I'll take it off again tomorrow and check both by hand and with fwd engaged. If it's the shaft bearing I'm assuming I'll need the transfer case out? The manual says so but is it nessecary? If i need to take it out do i also need the overdrive off? Also what will I need for re-assembly? Gaskets etc.

Thanks in advance,
Brendon

before you get taking too many things to bits and getting too technical see if you can borrow a propshaft off someone ....

you may find your propshaft has been seperated at some time and not been reassembled correctly and in line for balance (or maybe even the two halves of different props) ...

an 8 bolt job just to eliminate that possibility

G'day All, If your front prop/shaft hasn't been played with i.e. a P.O taking it apart to service/replace uni joints, clean it up at the front.
On both sections of the shaft there should be /l\ (arrows) these need to be in alignment, if they are not in alignment this will cause severe vibration as well, cheers Dennis

Originally Posted by Chomby

It is disengaging properly. I think I noticed sounds while fwd was engaged and propshaft off. I'll take it off again tomorrow and check both by hand and with fwd engaged. If it's the shaft bearing I'm assuming I'll need the transfer case out? The manual says so but is it nessecary? If i need to take it out do i also need the overdrive off? Also what will I need for re-assembly? Gaskets etc.

Thanks in advance,
Brendon

The my manual says the front output housing can be removed without removing the T/C (actually looking at the S2a manual, but they are the same). You do need to remove the front output housing to replace the bearing, though, and it may be easier to remove the whole transfer case, depends on your working conditions a bit, but if just removing the front housing the question of removing the overdrive does not come in - If you remove the whole T/C, I don't think you can move it back far enough with the overdrive on.

You will need for reassembly gaskets for the front housing to T/C and seal retainer to front housing, O-rings for selector shaft and locking pin plus new seal and presumably new bearing. It is unlikely that you will find any other problems, although it occurs to me that your vibration could be the oil thrower on the front output shaft being loose, although I have never heard of this happening. Have a good look at the front output yoke - it is quite possible that sleeving or replacing this may be indicated if the seal running surface is in poor shape. And, of course, sealant, split pins etc.

John

John

Originally Posted by Dinty

G'day All, If your front prop/shaft hasn't been played with i.e. a P.O taking it apart to service/replace uni joints, clean it up at the front.
On both sections of the shaft there should be /l\ (arrows) these need to be in alignment, if they are not in alignment this will cause severe vibration as well, cheers Dennis

I've cleaned it up, new unis, greased all nipples, and aligned it properly. The arrows have each end at 90 degrees to each other. There's absolutely nothing wrong with the propshaft