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Not sure if this is what you are looking for but the best I could find was at CAMPINGLIFE.COM in the tow ratings listing. This is what it says:
Year Make Model Engine Tow Limit
1992 Ford F-250 HD 4 x 4 7.3 V-8 Diesel 10000
Requires 4.10:1 axle ratio, automatic transmission and Trailer Towing/Camper Package or Super Engine Cooling with Handling Package. Maximum tow limit with manual transmission is 8500 lbs. SuperCab tow limit is 8100 lbs. (manual). Maximum tow rating for fifth-wheel trailer is 11,400 lbs. (7.3 V-8 Diesel) and 12,500 lbs. (7.5 V-8) with automatic transmission; 8500 lbs. (7.3 V-8 Diesel) and 10,800 lbs. (7.5 V-8) with manual transmission.
Not sure what "DEQ" is that you mentioned. Hope this helps...