# 99 grand cherokee NV242 Selec-Trac help! **URL:** https://forums.speedlife.net/t/99-grand-cherokee-nv242-selec-trac-help/19559 **Category:** NYSpeed Automotive **Created:** [November 1, 2006, 12:03pm UTC](https://forums.speedlife.net/t/99-grand-cherokee-nv242-selec-trac-help/19559 "2006-11-01T12:03:49Z") **Posts on this page:** 1 **Showing post:** 2
### Author: ![Daddie](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/daddie/32/7621_2.png) [@Daddie](https://forums.speedlife.net/u/Daddie) #### Post date: [November 1, 2006, 12:15pm UTC](https://forums.speedlife.net/t/99-grand-cherokee-nv242-selec-trac-help/19559/2 "2006-11-01T12:15:51Z")
Your center diff sounds like it is screwed. 242 locks center diff in part time, 50/50’ing the torque to the front and rear Also : if you have open diffs, you technically can spin only 2 tires, but one in front and one in the rear. --- _[View the full topic](https://forums.speedlife.net/t/99-grand-cherokee-nv242-selec-trac-help/19559)._