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If you head over here: Diesel Technician Society
then you can look through some manuals and brochures explaining the design of and changes to the 7.3L throughout the years. In 99.5, there were 2 changes made to the 7.3L... First, the compressor (and compressor outlet) on the turbocharger were increased in size to improve airflow. Second, the intake air heater was added (to reduce white smoke during extended idling in cold climates). The first is an upgrade while the second is claimed to be a downgrade to performance due to the restriction placed in the intake (some say 20%).
In 2001, the 4R100 (auto) transmissions were built for some 6 months with a mechanical diode (instead of a sprag-style clutch) which was determined to be faulty in design and has failed numerous times.
The only reason 7.3L was replaced with the 6.0L was inability to meet new emissions standards. As such, and considering what I outlined above, you are best avoiding the '99 and '01 model years. Purchase the most recent 7.3L you can find.
2002 F-250 Lariat Extended Cab Long Bed, 7.3L, Auto, 4x4
- 6" BDS Suspension lift (All spring)
- Driveshaft Specialist 1 piece conversion
- 315/75R16 BFG A/Ts
- DP-Tuner F6
- DIESELSITE CPR Fuel System
- Turbo-Master Wastegate Controller
- Donaldson AIS Intake w/ "Zoodad" and AIH Delete
- MBRP 4" T304 Exhaust
- Coolant filter, Evans NPG+ Coolant, 203* Thermostat and Billet Housing
- Factory Tech Valve Body
- ISSPRO Gauges (Boost, Pyro, Trans)