I need to change out the drivers side bushing on rack & pinion unit (on my 96 TBird). Is this a very difficult job? Seems like the bushing is "squished" / worn out & the bolt seems to be bottomed out as I can't tighten it any further. Can it be changed without pulling out the whole unit, power steering lines etc? Or should I go for the whole rack unit? I have 130 K miles on my bird, how long does the stock unit usually go before it wears out (ie inner tierod ends, leaks etc )?