Under/overdrive transmission hook-ups

84_GT350 · 05-24-2001, 03:17 AM

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

WADS56 · 05-24-2001, 04:22 AM

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

84_GT350 · 05-24-2001, 04:26 PM

Yeah....those are the ones.

------------------
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

429mustang · 05-25-2001, 02:15 AM

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.

05-24-2001, 03:17 AM	#1 (permalink)
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	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. ------------------ 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

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05-24-2001, 04:22 AM	#2 (permalink)
WADS56 gear banger Join Date: Aug 2000 Location: CHICAGO Posts: 1,144	I herd of those before. They are $$$ and the claim that they can withstand 1500 hp. ------------------ 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

05-24-2001, 04:26 PM	#3 (permalink)
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	Yeah....those are the ones. ------------------ 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

05-25-2001, 02:15 AM	#4 (permalink)
429mustang Registered Member Join Date: May 2001 Location: westerville, OH USA Posts: 618	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.

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