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Turbo 400 adapter

March 5, 2026

For Sale | US Gear Dual Range overdrive unit with GM turbo 400 adapter

Rare US Gear Dual Range overdrive auxiliary transmission for sale with GM Turbo 400 adapter. Adds 0.80:1 overdrive to TH400/TH350 transmissions for better highway MPG and performance. Electronic shift. View eBay listing!
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Turbo 400 adapter

For Sale | US Gear Dual Range overdrive unit with GM turbo 400 adapter