Thought I would bring up this old thread again and express my opinion.
I recently brought a new front upper wishbone from shop4parts, it is manufactured by the italian company 'Birth.' I have had a couple of other items of their's before and in my opinion the quality is generally very good, their wishbone is no exception.
Anyway I took some pictures of it and compared it to the old original which is 'TRW'
I also took the opertunity to lubricate the bushes.
Firstly I drifted out the bushes,they came out easily enough with a sharp tap, as you can see from the attached photo's, in comparision with the TRW there are fewer raised crosses in the rubber bushes in the Birth arms, so perhaps not quite as good as the originals. However they were only £38 so I am satisfied.
The new bushes only had a tiny amount of grease on them, so I applied plenty of Castrol red rubber grease to them. The old TRW arm's were completely lubricant free when I took them off and the bushes were oval after 36k.
UPDATE 21 March 2014.
I wrote this 2 years ago, It was my personal opinion at the time, Well it failed MOT. I have sorted it now with some conclusions, I had one shop4parts upper wishbone(Birth manufacturer) and one AR original upper wishbone stamped as TRW.
The Birth part has some movement in the balljoint, but both rubber bushes inside are badly worn after 10434 miles.
The original AR TRW arm has done 17014 miles on it, and was only an advisory, I believe it would probably be Ok for at least another 5000miles, but I have changed it anyway.
I knocked out the metal sleeve bush and found the rubber to be a bit sticky but with hardly any wear.
So in conclusion Birth ok for 10000miles for £38, TRW good for 20000 miles for £55. Original TRW work out cheaper in the long run
Last edited by cooky257@ntlwor; 21-03-14 at 20:26.