Wheelbase?

What is the wheelbase of a cherokee supposed to be. I thought my front axle was sitting a little too far back, so I measured it today. From the center of the front hub to the center of the rear hub I get just a little less than 101". Is this the correct way to measure wheelbase? What is the correct wheelbase of a cherokee? Do I need to start thinking about getting some adjustable control arms?

Here are the specs:
Rusty's 4.5 coils
.75" spacers
Rusty's 3.5 rear springs
1.75 shackles
Rusty's fixed upper and lower control arms for 4.5" lift

Swapping front spacers for ACOS, and rear springs for 4.5" springs soon

101" is within 1/2". i think the factory wheelbase spec is 101.4"

101.4 is correct for the factory spec. It's normal for a lift to shorten the wheelbase just slightly.