OD transmission or Gear Vendors? - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 94 (permalink) Old May 18th, 19, 11:50 PM Thread Starter
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OD transmission or Gear Vendors?

Iím running a stout 496 big block with a TH400 transmission and 3:50 gears in a Ford 9 inch rear. Needless to say, my RPMs are unacceptably high on the highway. I limit myself to 50 MPH. AND, itís giving me really bad fuel economy.

Years ago, I broke the transmission. I had it built better and itís lasted. I also wiped the teeth off the pinion gear in the 9 inch. I have almost 600 lbs-ft of torque and I hook really good.

My options:

-4L80e transmission, my Fitech LS system will run it. Cons: itís really heavy (110 pounds MORE than a TH400) and has the highest HP loss of all transmissions, can easily be built for 1,000 HP. 5-6 grand built ďrightĒ.

-Gear Vendors overdrive. Cons: Gotta beat the floor up a bit, I think itís 60 to 80 pounds, bad drive line angles. Around $2,700.00.

-4l60e transmission, Only like 10 pounds more than the TH400, about the same HP loss, I see shops saying they can build them to handle 1,000 HP. REALLY?? Around 5 grand.

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post #2 of 94 (permalink) Old May 19th, 19, 12:13 AM
 
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Re: OD transmission or Gear Vendors?

4L80E.
Call Phoenix transmission in weatherford tx

675 HP rated for $3400
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post #3 of 94 (permalink) Old May 19th, 19, 1:21 AM
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Re: OD transmission or Gear Vendors?

What is this going into?
No hammering on mine with the gear vendor. Turbo 400 and 70 Chevelle.
Drive line perfect to.
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post #4 of 94 (permalink) Old May 19th, 19, 1:31 AM Thread Starter
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Re: OD transmission or Gear Vendors?

Quote:
Originally Posted by edspdog View Post
What is this going into?
No hammering on mine with the gear vendor. Turbo 400 and 70 Chevelle.
Drive line perfect to.

!971 Monte

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post #5 of 94 (permalink) Old May 19th, 19, 11:44 AM Thread Starter
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Re: OD transmission or Gear Vendors?

I think what I'm trying to find out is can a 4L60e transmission really be built that strong, keeping in mind that I had already broke the TH400 AND the 9 inch rear.

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post #6 of 94 (permalink) Old May 19th, 19, 12:41 PM
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Re: OD transmission or Gear Vendors?

With all of what I have read only, I would say No to the 4L60E being built strong enough

I have a TH400 and it has been working great in my car since it was Rebuilt in 2009
has been used for Cruzin on the Hwy/City Streets and at the Track

If I was to go with a 4 speed Auto it would be the 4L80
or maybe the GV dependant on the cost
as I believe the Car's Floor has to be adjusted to accommodate one or the other
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post #7 of 94 (permalink) Old May 19th, 19, 12:49 PM
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Re: OD transmission or Gear Vendors?

No on the 4l60. It might handle 1000 hp in a situation with less torque, but you'll find that 3rd gear will start slipping with your torque. A lot of the f body ls guys that make lots of power pull timing at the torque peak of the engine to get 4l60's to last. Kinda defeats the point...
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post #8 of 94 (permalink) Old May 19th, 19, 1:30 PM Thread Starter
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Re: OD transmission or Gear Vendors?

Thanks for the help folks.

Because of the 4l80e transmission's weight and HP loss, it looks like the Gear Vendor unit will be in my future. Even with a fiberglass hood, my car is already too heavy at 3,840 without a fat driver.

Does anybody know where the floor needs to be "adjusted" for the Gear Vendor clearance? I'm hoping not under the center console in the car.

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post #9 of 94 (permalink) Old May 19th, 19, 2:29 PM
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Re: OD transmission or Gear Vendors?

Quote:
Originally Posted by paul bell View Post
Thanks for the help folks.

Because of the 4l80e transmission's weight and HP loss, it looks like the Gear Vendor unit will be in my future. Even with a fiberglass hood, my car is already too heavy at 3,840 without a fat driver.

Does anybody know where the floor needs to be "adjusted" for the Gear Vendor clearance? I'm hoping not under the center console in the car.
I googled the weight: 178 lbs for 4L80e vs 135 for TH400.

A difference of 43 lbs.

I have a 4L80e in a 68 Camaro and it's not that large

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post #10 of 94 (permalink) Old May 19th, 19, 3:16 PM
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Re: OD transmission or Gear Vendors?

Just curious, whatís the weight of a th400 with a GV vs a 80e?

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post #11 of 94 (permalink) Old May 19th, 19, 3:21 PM
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Re: OD transmission or Gear Vendors?

The GV weighs about 22-25 pounds. I have it for about 6 years - nice unit. No need to change converter, shifter computer add in/connect etc. It does have a self contained computer box about the size of a pack of cigarets. I think you will find with the 4L80E the add ins will add up. I have mine in a 1965 Chevelle. You can see what you will need to fit it in the website is fairly informative. I think it adds 12 inches to the transmission. They tell you to do a coffee can test as it is the size of the unit. It will drop your 350 rear to a 2.65 or so rear. PM with any questions. It is perfect for the guy who does not want complicate his nice running turbo 400 and just use the OD on the highway.

Last edited by Lew540; May 19th, 19 at 3:24 PM. Reason: adding stuff
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post #12 of 94 (permalink) Old May 19th, 19, 4:34 PM
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Re: OD transmission or Gear Vendors?

If you have a good TH40 and a converter you like, I'd just add a GV.

I have a 4l80 (full manual) in a 10 second street car. So far I like it but kind of wish I'd went the TH400/GV route. Haven't played with the lock up feature much and I expect I'll like it but for the track side of things I think the TH400/GV would be noticeably better.
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post #13 of 94 (permalink) Old May 19th, 19, 4:38 PM
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Re: OD transmission or Gear Vendors?

Does Gear Vendors do anything other than .78 overdrive?
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post #14 of 94 (permalink) Old May 19th, 19, 6:33 PM Thread Starter
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Re: OD transmission or Gear Vendors?

Quote:
Originally Posted by nashville beth View Post
I googled the weight: 178 lbs for 4L80e vs 135 for TH400. A difference of 43 lbs.

Searching again just now, I found one website that said the 4L80e is 178 pounds dry weight, three websites that say 254 pounds, also dry weight.


It's also the parasitic loss that's pretty high that I don't like.

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post #15 of 94 (permalink) Old May 19th, 19, 6:44 PM Thread Starter
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Re: OD transmission or Gear Vendors?

Quote:
Originally Posted by Lew540 View Post
The GV weighs about 22-25 pounds. I have it for about 6 years - nice unit. No need to change converter, shifter computer add in/connect etc. It does have a self contained computer box about the size of a pack of cigarets. I think you will find with the 4L80E the add ins will add up. I have mine in a 1965 Chevelle. You can see what you will need to fit it in the website is fairly informative. I think it adds 12 inches to the transmission. They tell you to do a coffee can test as it is the size of the unit. It will drop your 350 rear to a 2.65 or so rear. PM with any questions. It is perfect for the guy who does not want complicate his nice running turbo 400 and just use the OD on the highway.

Thanks for the info and weight-which I couldn't find.

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