Author Topic: Overdrive for 727 torqueflite  (Read 6368 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 - 03:52:01 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 Tor Red
1973 318 Barracuda Mist Green
2014 Mustang GT/CS Convertible All Black

Offline rb70

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Re: Overdrive for 727 torqueflite
« Reply #4 on: November 07, 2010 - 11:03:48 pm »
$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 - 06:59:06 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