Barracuda Challenger Forum

Author Topic: Overdrive for 727 torqueflite  (Read 4414 times)

Offline BarracudaDave

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Overdrive for 727 torqueflite
« on: November 06, 2010 - 10:50:32 PM »
What options are available for adding an overdrive gear option to a 727 torqueflite automatic?  Car is a 70 340 Cuda.   
Anyone on this message board using any of these overdrive devices?

Offline 72hemi

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Re: Overdrive for 727 torqueflite
« Reply #1 on: November 06, 2010 - 10:55:02 PM »
The only thing I am aware of to add to a torqueflite is a gearvendors unit. If you are looking at replacing the torqueflite there are more options like the 518 automatic or the Keisler auto.
1972 Dodge Challenger 340 6 Pack 4-speed
1996 Dodge Viper GTS Coupe

Offline BarracudaDave

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Re: Overdrive for 727 torqueflite
« Reply #2 on: November 06, 2010 - 11:40:18 PM »
thanks for the info.  Right now I'm thinking I want to keep the torqueflite, but will look up the other options.
« Last Edit: November 06, 2010 - 11:41:58 PM by BarracudaDave »

Offline Road_Runner

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Re: Overdrive for 727 torqueflite
« Reply #3 on: November 07, 2010 - 04:52:01 PM »
I've been investigated O/D options myself both for the 4 speed in the Roadrunner and the TF 904 in the Barracuda.  I've heard nothing but good things about the Gear Vendors unit and if I decide I really need a steep gear in the car I'll likely go this route.  But I think I'll more likely stay with either a 3.23 or 3.55 gear in the Cuda.  The Roadrunner is getting a 4.10 rear gear so I'm either going the 5 speed O/D route or the Gear Vendors unit on the tail shaft of the 833 4 speed.  Let us know what you decide, and how you end up liking it.

Later, Jim
1970 383 Roadrunner
1973 318 Barracuda
2003 Harley FLSTC 100th Anniversary Heritage Softail
2013 Harley FLHTK 110th Anniversary Electra Glide Ultra Limited

Offline rb70

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Re: Overdrive for 727 torqueflite
« Reply #4 on: November 08, 2010 - 12:03:48 AM »
$2700 for gearvendors unit and you need to mod your driveshaft or 3800 for Keislers 4sp w/OD and it is a modern electronic unit.
Almost makes me want to put a Keisler 5sp in and 3.55 in the rear.
Guess I am just used to my vette w/3.07 4sp getting 27-28 mpg.

I did talk to 1 person who had the gearvendors in and said good things about it, but he also replaced it w/ 5sp.
The onething I do not like about the 5 series units from what I have read, is you have to modify the tunnel to get them to fit.

Offline Roppa440

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Re: Overdrive for 727 torqueflite
« Reply #5 on: November 08, 2010 - 07:59:06 AM »
Fitting a GV overdive was one of the best things I ever did to my Challenger. Been using one for many years. Most people buy one to get better mileage. It will drip your rpms by about 1000rpm. I fitted mine so I could run 4.30 gears but still get good highway speed.
You will need to shorten your driveshaft by about 14-inches and check you still have correct pinion angle.
1970 Challenger R/T
1997 Jeep Grand Cherokee Limited