Under/overdrive transmission hook-ups
 

Do these things really work? You know...those things you bolt onto the end of your transmission and they claim to turn your 3spd auto into a 6spd auto. They look really interesting and would be pretty cool if they really worked.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

I herd of those before. They are $$$ and the claim that they can withstand 1500 hp.

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347 W/ A-trim 6#'s, Canfield heads, out of the box Systemax II intake, solid roller cam. 11.1 @123mph 1.46 60FT

93lx 5.0 daily driver

Yeah....those are the ones.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

I recently looked into an overdrive unit, I'm putting a 429 in my 86 mustang and was planning on using a C-6 trans, but cruising on the highway with a tall gear, big motor, and no overdrive isn't too swift. I checked out Gear Vendors site, their units go for around $2200, they can handle 1,200 hp and can be switched from auto, which acts just like a factory 4 speed overdrive trans, to manual which I guess is supposed to split the gears in half, so when it shifts the rpm drops only half of what it normally would. I'm not sure exactly how it works, but it's supposed to be better than a regular overdrive trans and should bolt right up to whichever trans you get it for, but I don't have $2200 to spend on an extra gear so I'm just gonna take my chances with the 3 speed.