Owners manual

10. Drill two holes in frame for each bracket. Select the holes which will give the greatest spread between bolts.
Install eight 1/2”-13x1-3/8” ribbed neck bolts, (thread pointing out), lock washers, and hex nuts. Tighten nuts until
bolt heads seat. Lubrication of knurls of all rib neck bolts is recommended.
Note:
On vehicles with heavy duty suspensions, check for interference with bolts where brackets are mounted to
frame. If interference with suspension spring results, cut bolt flush to nut outboard of frame or use weld option.
WARNING:
DO NOT lubricate threads. It may cause bolt failure.
CAUTION:
Check for obstructions before drilling. Failure to do so could result in damaged fuel or
brake lines, structural members, etc. CURT MANUFACTURING does its best to communicate
tow vehicle manufacturer changes; however, it is ultimately the responsibility of the installer
to prevent damage due to installation.
CAUTION:
It is important that 17/32” drill be used for holes in chassis frame as rib neck bolts
may break if too small a hole is used and neck may not grip if too large a hole is used.
11. Torque all nuts to 85 lb-ft
12. Pull wire provided to pull rib neck bolts through frame as needed per application
Drill locations will vary. See individual installation for location
Use mounting channel/cross member assembly to position rails (not included).
Fig. 2 ** Diagonal Measurements must be the same for smooth
Operation of 16500 rolling units **
Rear edge of
truck bed to rear
edge of mounting rail
Rear Edge of
Truck Bed
Front
of
Truck
R
O
W
1
R
O
W
2
R
O
W
3
R
O
W
4
Choose (10) holes
identified by black
dots that correspond
with your individual
vehicle configuration.
Measure diagonal from
same reference point.
Measurement should
be the same.
3
Each mounting rail
must have a bolt in
either of the marked
holes. Check for
obstructions before
drilling.