Did you clean up the connections on the starter and battery? It is the problem 90% of the time. Clean all the grub and grime off till they shine, on the starter and on the cables.
No idea what part your talking about, pics speak a million words
1996 Cherokee Sport -4.6L Stroker, TB Spacer, Cold Air Intake, APN Header - D30 front / 8.25 Rear -RC 3" Lift -Dakota Leaf Pack -Rough Country Discos / -31" General Grabber A/T2s on 15x8 Cragar Soft 8s -Diamond plate rear quarter panels -Front bumper with hoop - IRO Double shear Track Bar and HD tie rod -Homemade light bar