Hi,

I'm hoping someone out there can help me get an idea of the towing capacity of my 1993 F-350 7.5L Dually CrewCab. I'm thinking about buying a new trailer, and these specs would be helpful. I don't have the owner guide

Thanks,

WackyPacky

 

Welcome to the site!

I can give you the specs for a '97 which should be close, but will need more info:

2WD or 4x4?
Gear ratio?
Manual or automatic tranny?

 

It's a 2WD with automatic transmission. I'm not sure about the gear ratio, though.

 

With a 460 engine and 4.10 axle ratio, the truck's GCWR (rating for combined wieght of both truck and trailer together) should be around 16,500 lbs. If your truck wieghs 7000 lbs, that leaves 9500 lbs left for the trailer. My '92 F350 CrewCab 4x4 Single Rear Wheel truck usually weighs around 6500 lbs without a load in the bed. A 3.55 axle ratio reduces the GCWR by a significant amount (something like 2000 lbs).

To find your axle ratio, look on your VIN sticker on the driver's door frame and there should be an axle code.

For 8250 lbs axles, code '65' is a 4.10 open diff, '69' is a 3.55 open diff, 'F5' is a 4.10 limited-slip diff, and 'W5' is a 3.55 limited-slip diff.

For 7400 lbs axles, code '45' is a 4.10 open diff, '49' is a 3.55 open diff, and 'D5' is a 4.10 limited-slip diff.

 

Thanks for unravelling the axle question for me; your reply was very helpful. As it turns out, my axle code is "D5" - so I have the 4.10 limited-slip diff. So, it seems like I may be able to pull a 9,000# trailer with no problem.