Ford 2008 F-250 Owner's Manual page 220

Tires, Wheels and Loading
Note: Do not exceed the GCWR listed for your vehicle on the following
chart/table, or the GVWR, GAWR or tire ratings specified on the Tire
Label or Safety Compliance Certification Label.
Towing trailers beyond the maximum recommended trailer
weight which exceeds the limit of the vehicle's GCWR, GVWR,
GAWR or tire ratings could result in engine damage, transmission
damage, structural damage, loss of vehicle control, vehicle rollover and
personal injury.
Maximum GCWR - lb. (kg.)
Engine Rear axle
ratio
5.4L 3.73
4.10
6.8L 4.10
4.30
F–350 Single Rear Wheel (SRW) Pick-up
5.4L 3.73
4.10
6.8L 4.10
4.30
F–350 Dual Rear Wheel (DRW) Pick-up
5.4L 4.10
6.8L 4.10
4.30
F–350 Single Rear Wheel (SRW) Chassis Cab
5.4L 3.73
4.10
6.8L 4.10
220
2008 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)
Manual
transmission
F–250 Pick-up
15000 (6804)
17000 (7711)
20000 (9072)
22000 (9979)
15000 (6804)
17000 (7711)
20000 (9072)
22000 (9979)
17500 (7938)
20500 (9299)
22500 (10206)
15000 (6804)
17000 (7711)
20000 (9072)
Automatic
transmission
16000 (7257)
18000 (8165)
21000 (9525)
22500 (10206)
16000 (7257)
18000 (8165)
21000 (9525)
23000 (10433)
18500 (8391)
21500 (9752)
23000 (10433)
16000 (7257)
18000 (8165)
21000 (9525)