borg Warner trans
Pro
Joined: Apr 2007
Posts: 528
Likes: 9
From: Grand Rapids Michigan
Looks like the Doug Nash 4+3 used from 1984-88 was also based on the T10.
http://forums.corvetteforum.com/c3-t...er-t-10-a.html
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
74 and later Vettes had GM specs T10 transmissions. I won't call them "super" because the gearsets weren't the special high nickle gears used in aftermarket Super T10s.
The C4 Vette had a 4+3 overdrive transmission designed by Doug Nash that used an auxillary planetary gearset like an auto transmission uses. The 4 speed section of the 4+3, is basically a GM T10 transmission.
The C4 Vette had a 4+3 overdrive transmission designed by Doug Nash that used an auxillary planetary gearset like an auto transmission uses. The 4 speed section of the 4+3, is basically a GM T10 transmission.
CF Community Team
Joined: Oct 2004
Posts: 19,350
Likes: 5,240
From: Cape Cod, Mass.
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I had a 4 plus 3 tranny in an 85 Corvette I owned a few years ago. Essentially a Borg Warner T-10, 4 speed coupled to a Doug Nash overdrive unit. It's design was flawed and problematic. 2nd, 3rd and 4th gears had overdrive which widened the gear ratio. It made for lower RPM cruising on the highway. Most that owned them switched them out for 5 or 6 speeds. Parts are hard to come by and nobody knows how or wants to work on them.
