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Home: Mustang Tech: Transmission and Drivetrain: How to identify a T5 5 Speed
How to identify a T5 5 Speed

The T5 5 Speed was originally manufactured by Borg Warner Automotive. The first T5 5 speeds were manufactured as far back as 1982 and are still being made at the time. The T5 was the only American made standard transmission to span almost 20 years of production. Because of the large quantities of T5's produced, many parts are interchangeable, allowing one to create interesting 5 speed combinations. No other transmission allows this to be done quite this easy. There are now over 260 different T5 transmission assembly part numbers.

There are 2 basic kinds of T5 5 speeds. Non World Class ( NWC ) and World Class ( WC ). The T5 is an evolution of the Borg Warner SR4 4speed. The SR4 was a lightweight design, ball bearing and needle bearing counter gear box using bronze synchro rings. The T4 was an improvment of this design, using tapered input and output shaft bearings combined with a drawn cup roller bearing countergear. The T5 NWC was a T4 with an added 5th gear.

NWC T5's were issued in 1982. By 1983 Ford started using them in the Mustang, by late 1985 the first WC boxes were used by Ford. The WC boxes had 1st, 2nd, and 3rd speed gears riding on roller bearings instead of solid shafts. The countergears saw an upgrade to tapered bearings. The bronze synchro rings were replaced by fiber lined rings and dual cone designed rings to improve ring surface area.

The next application will show you how to identify T5 5 speeds. The TAG id program requires the stamped number off of the tin metal tag bolted to the tail housing. No other numbers on the case, tail or cover are needed or will tell you anything.

T5 Transmission Tag Identifier

Select Tag# then press Identify Button


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