The discs are about $80.00 each (2 required), but the labor cost is heavily dependent upon your DIY capability. If you have the tools, time, and inclination to do it yourself, you can get away for pretty much just the discs. There are 'complications' though: The center hangar bearing should be replaced if it has not been already. The disassembly will put you in the neighborhood to check and replace the transmission mount, if needed. The parts are not that expensive, but the labor can be a bit pricey if you're having it done at the dealership.
If you are 'insane' (and experienced) enough to try it, the savings can be considerable.
Just had mine replaced two weeks ago. Parts ran about 250.00 (both flex discs, center hagar bearing, rear axle seal). One flex disc was almost twice the cost of the other for some reason, but mine has a 6 cylinder engine and maybe the discs (& whole trannie assembly) are different, check to make sure you get the correct ones. The new ones make shifting feel soooo much smoother !
Cant comment on labor costs, as in my country that is where I am priviledged, spent USD 100 to get them installed and took about 4 hrs time, but also had the shocks done at the same time.
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