Gearvendor?
Senior User
Joined: Jul 2009
Posts: 343
Likes: 4
From: Northwest
I had thought of putting in a gear vendor, I have 3:00 gearing and my F150 with a 400 and C6 gets around real nice on the street, I even towed a loaded 21ft 7500lb toy hauler and it did great on the flats and right at 40 mph on the pass but towards the top I was down to 35mph, I must say it did it though and I was impressed but an F150 short bed is not the best tow vehicle for that kind of weight with 3:00 gearing! Which is why I'm restoring a 1973 F350 super camper special with 4:10 gears.
Posting Guru
Joined: Oct 2007
Posts: 1,069
Likes: 3
I have 2 installed in my trucks 79 f350 s/c 460/c6/3.73 ratio and a 78 f250 reg cab 502/c6/3.54 ratio both work very well they will drop the rpm aprox 600 rpm
3.73 runs 2100 rpm @ 60 mph 3.53 runs 1900 @ 60 mph I get about 12 mpg with the f350 w/3500 lb 12 ft camper and about 16 mpg with the f250 you can split the gears on these units 1/1 over 2 /2 over etc either leave in auto [4 speed] or 6 speed if you split works well with the camper unit in the hills you have a gear for every grade easy to install your self just make sure you get your driveshaft angle BEFORE YOU REMOVE IT or you will have a driveline vibration I am trieing something different with the f250 I will be making it in to a f150 with a ford 9" and 2.75 ratio and see how that works s/b be able to run about 1500 @ 60 mph but mind you my engines are all built for tork
3.73 runs 2100 rpm @ 60 mph 3.53 runs 1900 @ 60 mph I get about 12 mpg with the f350 w/3500 lb 12 ft camper and about 16 mpg with the f250 you can split the gears on these units 1/1 over 2 /2 over etc either leave in auto [4 speed] or 6 speed if you split works well with the camper unit in the hills you have a gear for every grade easy to install your self just make sure you get your driveshaft angle BEFORE YOU REMOVE IT or you will have a driveline vibration I am trieing something different with the f250 I will be making it in to a f150 with a ford 9" and 2.75 ratio and see how that works s/b be able to run about 1500 @ 60 mph but mind you my engines are all built for tork
Post Fiend
Joined: Jan 2006
Posts: 5,037
Likes: 9
From: Kasson, Minnesota
* For the price of a OD unit, I bought a 01 Lincoln Continental with 90000 and it gets 25 MPG. Don't get me wrong, one of those OD units would be very nice in the old ford.
Those are some good improvement numbers.
Those are some good improvement numbers.
Postmaster
Joined: Nov 2011
Posts: 2,553
Likes: 10
From the example posted, the OD really helps Dent mileage.
I made the choice to put OD in a hot rod project. I know the payback isn't great in terms of calculated gas saved but there are other benefits. Its quieter, the engine lasts longer and cruise range on a tank is increased. Plus, once paid for, I can afford to drive it more.
I made the choice to put OD in a hot rod project. I know the payback isn't great in terms of calculated gas saved but there are other benefits. Its quieter, the engine lasts longer and cruise range on a tank is increased. Plus, once paid for, I can afford to drive it more.
Post Fiend
Joined: Jan 2006
Posts: 5,037
Likes: 9
From: Kasson, Minnesota
the RPMs would be very nice. However, if fuel continues to rise and really gets up there than even a minimal increase in MPG can mean something. Here in MN fuel is 4.12
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