Originally Posted by imstillatwork
If you can get a good recommendation on a local shop, it is sometimes best to have the shafts lengthened / shortened a needed.
It's a good opportunity to make sure the shafts are good and fix them as needed also - balanced, slip joints are good, replace u joints if needed, service DC joint if needed etc..
Local is good. (Unfortunately, I don't have a good local shop.) I sent my rear shaft to Tom Woods for shortening/balancing. It cost about $120 with shipping both ways. They did a great job. Highly recommended.
I'm not sure a used front shaft is a good value - I'd recommend new if you can afford it. You can get a new DS made to length from Tattons on eBay for about $165. Would have all new u-joints, perfect new slip joint, be the ideal length, etc. Tom Woods is a little more expensive - $190 if my memory is correct. This is for a front shaft, u-joints on both ends (not double cardan).
Others will recommend a used DS - I just like to do things once, and not fiddle with u-joint replacements in 6 months; Or vibes from a worn slip joint; Or deal with damage from a shaft that is too long or too short. There's no right or wrong - it's just whatever you feel comfortable with.