All leaf sprung models require the use of the standard GM metal sump as found on VN, VP, and VR V6 engines. VS, VT, VX, and later engines are fitted with cast alloy sumps and will not give sufficient front end and steering track rod clearance. With some small modifications the later engines can be fitted with the earlier model metal sump.

The IFS models also require the use of a metal sump however it must be modified to allow for sufficient steering track rod clearance. Marks 4WD Adaptors manufacture and stock a new metal sump for this application.

This sump/oil pan is designed to give legal differential and steering arm clearance. The oil pan fits in front of the differential housing and the steering arm linkages.