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
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