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Here is a Borg Warner 4 + 3 Overdrive 4-speed trans that came out of a running 1985 Corvette that was parted out. Mileage is around 70,000 miles. This has a 2.88-1 1st gear, the front main case section is Super T-10 4 speed, back section is the overdrive unit. These were manufactured by Doug Nash Engineering for GM and only used in 84-88 Corvettes.
Call the 69 year old gear head. I have other rebuilt GM 4-speeds, Hurst shifters, flywheels & Bells