who has the best price on a conversion kit for an 84 z28. i gotta get rid of the 7.5 was thinkin a ford 9"?

 

IMO the "only" way to go, is to have a unit built by either Currie, or Moser.

 

no matter what axle model you decide upon, you have to hope that its not too wide, or youll have to buy custom shafts,a nd cut down axle tubes length and weld flanged back on them
if you have a welder and can use it then you can do this very easily

good luck

 

Buy the housing with axles from Currie or Moser. Buy a center section with the gear ratio you want locally. Cheap, cheap is to use an open carrier but buy a limited slip or locker carrier locally. Once you have the housing with axles, the rest can be purchased locally for a lot less money than in a package deal. There's usually lots of parts available from swap meets etc.

You will need that aftermarket housing though. It will have all the mounting points to be a direct fit into a third gen. Because of the torque arm design, you can't just find a junkyard diff and bolt it in. Most junkyard 9" housings are too wide also so you need to be sure exactly which one will work.

My housing is from a 1970 Ford F100. I use ladder bars so I didn't have to worry about a torque arm mount. I moved all the other parts to mount the springs, shocks etc over to the 9" housing. I also use Ford drum brakes. The only downside to the housing I have is that the pinion isn't in the center. Both my axles are the same length when the majority of all the car 9" diffs have a longer passenger side axle.