What are the toe alignment specs for 1996 grand Cherokee?

The toe in and out or a grand Cherokee is not adjustable. However if for some reason you do need to change it the only way is to purchase new ball joints which are off centre so by turning these you can adjust accordingly. These were fitted as an option and are only available from main dealers

That is not correct.

The '96 ZJ has an inverted Y setup. Adjusting toe in is as simple as rotating the adjustment collar on the tie rod. Most people run 1/16" to 1/4" toe in. IIRC factory spec is 1/8" toe in.