Vibration since new 3" lift, 3rd's, and drive shafts

[Slunnie]

With that lift you will go vib free if you keep the rotoflex coupling. As soon as you chnage to the unis you get vibrations. In terms of changing pinion angles, Superpro in Aus do a offset bush, and by all accounts in other Rover radius arm applcations they improve articulation over rubber due to the flexability of the particular poly blend. This said, the pinion will still be pointing at the t/f output and so its suitable to run a DC or CV I think you call them over there at the t/f and a uni at the diff. I currently run that setup and it still vibrates. I seriously think the only way to do it now and maintain these lifts (4" in my case) without vibrations is to return to the rotoflex in the rear propshaft. The problem is that with 35's, lockers and bushwork, is that the rotoflex doesn't last long at all.

 

[rover4x4]

probally the rebuilt drive shafts, shoulda gotten Tom Woods

 

[Slunnie]

probally the shafts, shoulda gotten Tom Woods

I do have Tom Woods shafts, F&R. Adaptors have been tested for run out also, with nil.

 

[gmookher]

I am wanting to agree as after trying both the woods and the gbr I liked the roto best; so what if i swap it out yearly as a safe measure?

 

[Slunnie]

I am wanting to agree as after trying both the woods and the gbr I liked the roto best; so what if i swap it out yearly as a safe measure?

I did some very minor research into this and surveyed an Australian Disco2 forum re rotoflex failure and admittedly there were only 8 people that admitted rotoflex failures so some might question the validity, but the only thing that came from this, was that failures were almost always dependant on use, and big mud/bog tyres seemed to be a common theme and I would assume the driving that is associated with these tyres. Age and distance did not seem to have any bearing on the results and nobody had a failure on standard sized tyres.

What I'm saying, is that I wouldn't bother changing it as a service part on a Disco2. I'd wait until I broke it.

 

[gmookher]

well,I have a perfectly good rear tom woods shaft. for sale, fits d1(et al), d2 etc, includes the 4 bolt pinion flange kit

 

[Slunnie]

Did you end up going back to the Rotoflex? If so, how did it go?

 

[gmookher]

rotoflex is my friend on the highways at 75-80mph.
I have 2 spares..
and a spare rotoflex bolt.

I really do like how the UJ shaft get rids of slop in the drive line at slow speeds and for wheeling, but I spend more time on the highways than I do on the dirt with my truck, tho if it was otherwise I'd keep the woods shaft.

I dunno, i may regret it in 25k miles after $200-300 in rotoflex fees, buying genuine..but I may have to write that off as operational costs. its smoother..

 

[Bartley]

I never changed anything. I just turn the music up and enjoy.

 

[Discoinjapan]

Drop the D2 and get a D1!

EASY!

 

[KyleT]

rotoflex is my friend on the highways at 75-80mph.
I have 2 spares..
and a spare rotoflex bolt.

I really do like how the UJ shaft get rids of slop in the drive line at slow speeds and for wheeling, but I spend more time on the highways than I do on the dirt with my truck, tho if it was otherwise I'd keep the woods shaft.

I dunno, i may regret it in 25k miles after $200-300 in rotoflex fees, buying genuine..but I may have to write that off as operational costs. its smoother..

clean your PMs.

 

[92rrrandall]

Anyone ever consider that the 4.11 gears that come from GRB may cause the vibration?? In 2002 I put these gears, plus a lot of other parts, on a RRC. The amount of lift was not changed.

When I went for a drive with the new 3rd members, the vibration was so bad that I could not see out any of the rear view mirrors. This is on a truck that is maintained and engineered to the extreme. Over the years I have gotten most of the vibration to go away, but it is still there. The only part that has not been swapped out is the 4.11 gears. Everything else has been tested, measured, swapped, investigated, etc. Also it is only the front gear that causes vibration.

Randall

 

[michaels]

Anyone ever consider that the 4.11 gears that come from GRB may cause the vibration?? In 2002 I put these gears, plus a lot of other parts, on a RRC. The amount of lift was not changed.

When I went for a drive with the new 3rd members, the vibration was so bad that I could not see out any of the rear view mirrors. This is on a truck that is maintained and engineered to the extreme. Over the years I have gotten most of the vibration to go away, but it is still there. The only part that has not been swapped out is the 4.11 gears. Everything else has been tested, measured, swapped, investigated, etc. Also it is only the front gear that causes vibration.

Randall

there are documented cases of the 3rds from GBR causing bad vibes.

http://discoweb.org/forums/showthread.php?t=51442

 

[gmookher]

its not just 4.11s ...

 

[92rrrandall]

Thanks for confirming this.

Not mad at GBR, but wish this was known back in 2002. Spent more hours than you can imagine trying to figure out WTF was wrong. There is nothing left to consider but that gear.

If I were to spend the time and $ to get my front diff rebuilt with a new R&P gear...where should I go?? This is a specialty that needs to be done right.

Randall

 

[Mongo]

any driveline shop can set up a third...and Gem using the rotoflex is only masking the problem..

 

[Slunnie]

GBR are not the only ones to have had this. Runout in the pinion was the problem in the case that I know of.

I agree Mongo, but whether its masked or not, its better than driving with the vib. From what I can work out the front shaft creates the vib when you wind the lift on. At this stage I'm thinking that a CV (as in CV, not DC joint) at the gearbox may be the solution, but I'm not up to that yet.