Hello Group,
Here is the difference between the WC and NWC Borg warner T-5.
I will als be listing ways to I.D the WC and the NWC.
World Class & Non-World Class
There are two basic kinds of T-5's, Non World Class (NWC) and World Class (WC). The first T-5 was non-world class. In 1983 and 84 Ford used the Non-World Class T-5 to improve the Mustangs performance and gas mileage. All the V8 NWC boxes had 2.95 first gear set with .68 overdrive. All the main output shaft gears and 1st, 2nd, 3rd, gears riding on a solid output shaft with deep oil grooves to provide lubrication. The lower counter gears spin on straight cylindrical bearings with a thrust washer in front to provide support when under load. All the synchronizer rings are made of solid bronze which are of different size than those found in a would-class T-5. It is because there is no bearing under each gear and the bronze synchro rings that the NWC use the heavy 70w gear oil. Torque rating for the NWC was 265ft/lbs.
1985, Ford introduced the World Class T-5 installed with 3.35 first gear set with a .68od behind the 5.OL. T-5 was also used behind both the standard 2.3L with a 3.97 first gearset and the SVO Mustang. SVO received a one year only 3.50 first gear ratio as the 3.97 gear ratio was too low for the added power of the turbo charged 2.3L. No longer were 1st, 2nd, and 3rd gears spinning on a solid output shaft as needle bearings were installed under each gear to reduce drag. The lower counter gears saw tapered bearings to replace the bronze thrust washer. All main shaft synchro's were fiber lined steel rings to improve rings friction surface while 5th remains bronze. By improving the surface friction the synchro slows the gear faster making for smoother shifts. The design remained the same until 1989. Torque rating remained the same at 265ft/lbs.
From Pintony