Thoughts on Polybush for Offroading?

acg

Well-known member
Background:

My Polybush brand (front bushing for the rear radius arm) was only 2 years old when it completely disintegrated when off-roading last year. I used the orange colored one (Medium Duty)

I could not get the same orange colored bushings last year due to COVID supply shortages. I ended up replacing them with the blue ones (medium comfort). Well, one year later, the bushing disintegrated on an offroad trip. I am guessing the Medium Comfort rating is not adequate for our type of off-roading (lots of rocky terrain).

The Polybush brand as a red version (performance racing, Hardest elastomer rating of their bushing levels).

1) Can I get thoughts on poly bushes in general? Polybush's site claims they they last longer than the factory rubber ones and are easier to change. However, two failures in just a year is strange. Their two piece design would be easier to replace. What has been your experience?

2) What about the elastomer hardness selection? Wondering if I should do the hardest (red) version instead of the medium (orange)?

Thanks in advance.

P/S. This was my buddy’s bush fix idea to get me out of the trail. The material was tough to scrap off. Luckily he had a small butane torch to burn off the remaining polyurethane material. We used a heater hose wrapped around the pivot bushing to cushion of the metal to metal clunking.
 

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lunchbox

Well-known member
Apr 20, 2004
2,139
166
50
St Louis, MO
I use the Terrafirma bushings now. They are one piece. I was having trouble with the PB ones falling apart at the seam. They are a little tougher to install. But nothing a wrench or drill won’t do in a few minutes
 

ERover82

Well-known member
Nov 26, 2011
3,923
460
Darien Gap
The major problem with polyurethane bushings is their failure mode. While a low quality rubber bushing may not last as long as a genuine or poly bushing, at least they fail in a slow controlled manner. Polyurethane bushes tend to fail quickly and severely, which is obviously not ideal when you're in a remote area.

That said, if I were to choose a polyurethane bushing, I'd go for SuperPro or Bearmach for their quality and soft durometer (still harder than rubber). I believe SuperPro is the OEM for Bearmach.
 
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K-rover

Well-known member
Jan 15, 2010
2,179
69
Raleigh, NC
Ive had blue poly on my front frame side and orange on the axle side for 5yrs. They have small cracks but still good. My truck is a camping offroad truck with 4" lift and 35s. I have super pro on the rear frame side. They've been on for 1.5yrs. No noticeable wear. Screenshot_20220107-092209_Gallery.jpg
 

terryjm1

Well-known member
Jan 23, 2011
1,499
381
I have installed poly bushes on one vehicle (not a Land Rover) and back then there was only one manufacturer and hardness available. I felt they transferred too much vibration and gave me more “road feel” than I wanted. I would think for off roading that wouldn’t matter but I drive my Land Rovers a lot more on public roads than off road. I will say, in my experience poly bushes are easier to install.
 

K-rover

Well-known member
Jan 15, 2010
2,179
69
Raleigh, NC
These are my blue poly bush after 5yrs on the truck. I tried (non oem) rubber on the rear before switching to Super pro. They lasted 1 trip.
 

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