Hey there...

Well, after slapping the Toy 3rd in the rear, I took a picture to ponder on it ( ) and it seems that the pinion angle is not too "nice". Now I do have to admit that I have not "felt" any vibes whatsoever over and above the Rover set-up, and I actually have less overall noise and vibration due to the IROKs (Simex kills there) and the front Hi-pinion.

Here's the picture...note that the rear trailing arms have been custom made with a 3/4" increase in length.

http://www.discoweb.org/forums/attachment.php?attachmentid=976&stc=1

Given the fact that I lube up the EVERYTHING on the truck regularly and that the truck is mainly a trail rig (though I DD it from time to time), do you think it necessary that I fix this (with the A-Arm extension)?

Nadim, that doesn't look so good. If it was my truck and I put all that time and money into it, I would definitely fix it.

my thoughts too...just wanted the boards' POV...

Nadim - everything you need to know is in here:

driveshaft 401 (http://www.pirate4x4.com/tech/billavista/PR-shaft/)

the angle doesn't look so bad for a non cv shaft. if you tilt it up you will be out of phase and would then need to buy a CV shaft. the operating angle is what will kill the ujoints regardless if they're in phase or not. if it doesn't vibe that bad, maybe you like changing ujoints. your homework is cut out for you here - good luck.

Seabass...

I am thinking of keeping it as is...IIRC, that rear UJ is the same one since 1992 :smokin:

Maybe I'll change them and then that'll be good for a couple of years...don't feel like putting more cash were it may not be smartly invested...

Thanks.

A-arm extension is great because you move the axle backwards. Moving the springs will probably be necessary, but that's a good argument to get coilovers :D

Naah...I'll go air shox then...

see, the argument I am having is not to do anything or the A-arm, a 150$ (at most, if I don't do it myself) ordeal...now you got me thinking into 200$ a side...hmmm...you've almost got me convinced :shaking:

>> Maybe I'll change them and then that'll be good for a couple of years

read the tech! the total operating angle on that shaft is probably pretty high. check out billavista's chart for u-joint life span in relation to total angle - NOT a pretty chart :evil:

Vibration (phase) and u-joint life (angle) are unique variables.

the easiest and most cost effective thing to do long term is to point the pinions at the t-case and run CV shafts on both ends. my point above was that it may not vibe too bad the way it's set up, but may find u-joints wear out PDQ. if your rig doesn't see that much street time then you might be able to live with it.

I encountered a similar problem after fitting Volvo axles to a LR110, The larger section axle tubes with standard length lower radius rods caused the pinion to tilt down. Fixed it by moving the 3bolt radius arm chassis bushes to the front of the chassis mount instead of behind. You can use longer bolts and add shims(washers) to suit. A reinforcing plate made from a scrap bush prevented any distortion from the forward thrust.
Bill.

Nadim...I'd get an angle finder on there...the angle of the pic is probably making it seem worse to us here on the interweb.

I'm not saying it's "ok" but look at the angle on our FJ60
http://www.endlessearth4wd.com/Wallace_067.jpg

It's been fine and doesn't look like suck a bad angle in person.