[QUOTE="REPLIMOD" #17]Thanks everybody for all the help. I might just settle for an open rear and drop an after market locker in myself...thanks again[/QUOTE]
There are gobs of aftermarket 3rd members available. For one like you are looking for, you need to look into trucks that are bigger than 1/2 ton. They put a 31 spline axle in the F150 (4x4) starting in 78, other than that your best bet is pick one up off of E-bay or a forum classified section.
They are pretty common in the off road world, and as for the factory trac loc, don't waste your time, it's crap. Look at Currie, Strange and others like that. There are Al members available, but I can't testify to their strength, they'd be a dead duck on the trail in no time. Nodular iron is the only choice for me. There are high pinion offerings available also, they aren't a good idea, poor oiling, and the torque being applied to the coast side of the ring gear.
For all things 9" check out:
New 9" which is by
Currie
For the 9" buildup masters, check out
Sunray They will build up a 9" that really is bombproof
For a great source of axle parts, online classifieds -
Pirate 4x4 You'll have to sift through the winners and losers, but you can find 9" parts on there every day.