Stick with the rubber mounts. Poly mounts can be trouble! (vibrations, cracked transmission case etc.)
Gear lube smelled bad.... burnt?
Not a good thing, change it! Check the gears for pitts and wear, metal in the lube, etc.
Bad gears will usual cause a noise, not a vibration (usualy). Genneraly releated to excell or decelleration. More pronounced at freeway speeds. Also, very speed related.
*see "Randy's Ring and Pionion" site for a excelent description*
Drive line (train) vibrations are more of a "boom" kinda thang.
Also, speed related, sometimes excell/decell. Best bets to pull the drive-line out and check the joints by hand. "detents" in the joint travel is a sure sign it's bad. It should travel evenly and smoothly, with very little resistance.
You put in a new joint in the back, is it "preloaded"? Shouldn't be. (work it by hand, low resistance, no detents). If it is too tight, the caps are on too tight. lay it on the free cross shaft and useing a scocket over the yoke, a light smack with a hammer should seat the C-clips.
On the T-case side.
Before removal, check the yoke to t-case out-put play. Grab the yoke and push up and down, if there is a defent "clunk clunk", than the yoke and/or bearing -maybe- bad.
Than remove the driveline and check the joint.
Other common causes to a vibration on excell;
- bad moter or trans mounts, allowing the engine to "ground-out" under force.
- poor u-joint angles under excell, basicly, the rear u-joint angle changes only under excel due to lift/soft springs/soft shock/etc. Not likely in a mostly stock ride.
- exhaust grounding out on a cross member etc.. under load the engine tweeks over, taking the exhaust with it.
Hope this helps some.
<font color=blue>Twiztid</font color=blue><P ID="edit"><FONT class="small">
Edited by Twiztid on 10/29/01 09:15 PM.</FONT></P>
