Borg-Warner T-10 Build/tips (Part 1)

®
HOW TO:
Up-Shifting
Article, Photos and Rebuild
by Kevin Owens
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1
During the Turkey Rod Run in Daytona,
Ray had run across this Borg Warner T-10.
These units look similar to Muncie’s, but the
cast-iron side cover is a dead giveaway. In
this build, I will be discussing wear areas to
check while building a manual box.
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This is where the forks ride, these surfaces should be checked for wear also.
Both sliders in this unit pass inspection,
the forks are made of a softer metal than
the sliders themselves so will be replaced.
A very interesting marking on this unit
says NASCAR 69 TEAM. I wonder what
car(s) this transmission has been in, and
who has actually shifted it at one time.
Professional Trans
813-964-0852
www.protranserv.com
The first thing to remove is the side cover,
where we can get the first glimpse at the
internals, including the shift forks. As shown,
these forks have wear on them. These forks
ride inside of the slider assembly, which
mates to the side of each gear for engagement to the output shaft.
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As this photo shows, the thrust washer for
the reverse idler gear has chewed up the
end of the gear. The washer did begin to
spin around inside of the tail housing, but
the unit was probably taken out of service
before any major damage could begin.
The reverse slider rides on the output shaft.
No teeth are missing, and the ends of the
teeth are not chewed up at all. This gear is
in perfect shape.
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Although the engagement teeth on the
input shaft are also in perfect shape, we
will be replacing the shaft due to excessive rust/pitting on the tip where it fits into
the pilot bushing.
This is where the rollers ride from the input
shaft “pocket-bearings”. This surface can
sometimes be pitted, but once again, this
shaft is in perfect shape. Keeping these units
full of gear lube greatly reduces wear.
50 • CRUISIN’ STYLE • 2010
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Although we are replacing all syncro /
blocking rings in this unit, the gap here is
how wear is determined. The smaller the
gap here, the more difficult the shift, and
when it gets to a certain point, the faithful
‘crunch’ is heard upon engagement.
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