LS Datsun

[andrewb70]

Also, I was interested in the 9-inch for durability. Some other members suggested firebird 8.8 pumpkin with IRS setup. Whatever I do go with, it has to be posi. This car weighs next to nothing and I'll need whatever traction help I can get.

I think you mean Mustang Cobra 8.8 IRS diff...

There are various options that you can implement, some that use OEM Nissan parts and some that will adapt other IRS diffs to your chassis. Have you looked at the various LSx Z-car build threads? There are a lot on LS1tech and also on hybridZ. Also keep in mind that the chassis was never designed for a live axle. There probably isn't enough room above the center of the diff to allow for up and down movement. In other words, you will have to hack up the body to install a solid axle.

Andrew