Author Topic: Overdrive for 727 torqueflite  (Read 7004 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?
thanks




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.
Dave
1970 Challenger R/T
1997 Jeep Grand Cherokee Limited

Offline chryslerfan

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Re: Overdrive for 727 torqueflite
« Reply #6 on: January 26, 2018 - 11:08:21 pm »
http://smrtrans.tripod.com/smrtransmissionsintro/id33.html

Have any of you used this option for installation of overdrive for B and E body   I see we have to cut the driveshaft but no modification of the hump in the floor over the transmission (or so they say).   Would be interested in knowing if there is a viable option to allow highway driving at lower RPM.   I am used to cars with less RPM at highway.   I keep thinking I have it in second gear (out of three) and that I am about to blow something up if I don't let off the gas.   Suppose it just takes some getting used to.  Best wishes. 

Offline jason340

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Re: Overdrive for 727 torqueflite
« Reply #7 on: January 28, 2018 - 03:46:07 pm »
Keisler went out of business a few years ago. I don't know if anyone picked up their auto overdrive unit.

Offline Mopar Mitch

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Re: Overdrive for 727 torqueflite
« Reply #8 on: January 29, 2018 - 02:18:17 pm »
Keisler is now "SILVER SPORT"... previous staffing repurchased from Mr. Keisler.. heard only good things about them since the business restructure.
Autocross/road racers go in deeper... and come out harder!

See  MOPAR ACTION MAGAZINE, AUGUST 2006 ISSUE for featured article and details on my autocross T/A.