Ford Truck Manual

Ford 4-Wheel Drive 4, 5 and 6 Speed Manual Transmissions.

FORD 4-Speed Manual Trucks

Yellow Stone Vacation's, E-350

The BorgWarner T18/19 and NP 435 are both wide ratio 4-speeds. They have a granny low and so then just 3 normally usable ratios. See Final Drive Ratio charts and notice the extreme benefit there is to Gear-Splitting by using the GEAR VENDORS. You will now have ratios between each of your gears that keep the engine in the power and torque multiplication much higher when climbing grades or accelerating. When 3rd is going to be too slow and 4th is lugging you will simply hit our button on your shifter and move the shift lever to 3rd for 3rd-over which is just like you switched to a stouter rear end gear. There is just no comparison to what these gears will do for performance.

When cruising on the highway you will enjoy a 28.6% faster cruising gear, which will have your 4.10 rear gear down to 3.20 revs. The same rpms that currently take you just 500 miles will now take you 643. Fuel mileage jumps 22-28% and the engine is on a much improved rpm for cool running and durability. There is no good reason to own this truck without a Gear Vendors Under/Overdrive. The unit will pay for itself in increased fuel mileage, decreased wear to every engine driven component in the truck, and resale value (or use our exchange program if you ever sell the vehicle). Call us at the factory and get one – all units come with a 2yr unlimited mileage warranty and a 30 day money back guarantee so you know you are going to be happy with everything about how the Gear Vendors installs and drives.

Read the other sections below as well as the Common Questions page. No competing product can benefit you as much as the GEAR VENDORS.


FORD 5-Speed Manual Trucks

Look at the Final Drive Ratio charts and notice the great benefit in gear-splitting with the GEAR VENDORS. When climbing grades you will have a gear between 2nd/3rd and 3rd/4th that is ideal for keeping the engine in the power and the torque multiplication up. Look at the horsepower and torque curves and notice that by keeping the engine in the power you will gain 50+ horsepower and 60+ lb ft. of torque without any modifications to the engine.

Ford axuliary transmissions

The more heavily you are loaded the more you need the GEAR VENDORS. When you are heavy you would do best by not using 5th but instead use 4th + GEAR VENDORS (4th-over). This will keep your transmission temperature as much as a 100 degrees cooler (extending transmission life) and puts that work on the GEAR VENDORS planetary gearing with is much stronger.

When you are running empty (without the aerodynamic load of the trailer) you can use double overdrive (5th-over) and enjoy 22% lower engine rpm and better fuel mileage. At today’s 75mph highway speeds this is a very valuable feature and will pay for the overdrive quickly in fuel mileage, reduced engine and engine driven accessory. The same number of rpms that currently take you just 400 miles will now take you 643. Expect fuel mileage gains of 22-28% depending on rear ratio. In addition the vehicle is much quieter when cruising – the whole truck is just nicer to drive and our money back guarantee ensure you are going to be happy with everything about how our units install and drive.

Read the Common Questions page and then order a GEAR VENDORS. No other product can give you the performance or economy of Gear Vendors Under/Overdriveâ„¢.


FORD 6-Speed Manual Trucks

Look at the Final Drive Ratios chart in this section and notice the benefits of gear-splitting with the six speed transmission. 2nd-over and 3rd-over give you gears that make more torque multiplication than taking the full shift to the next gear. Also now when you do shift up to 3rd-direct and 4th-direct you are going 28% faster so the rmp drops nearly half of what it did without the GEAR VENDORS.

Ford manual transmissions

Performance with these shorter steps improves horsepower 50+ and Torque 60+ lbs ft. without modification to the engine this is the most reliable way to make power (study the Horsepower and Torque curves). Notice that 4th-over and 5th are really duplicates (which is why you don’t feel like you need a gear between here). 5th-over however is very useful when the vehicle is heavily loaded because it has a slightly higher torque multiplier and most importantly the transmission will run as much as 100 degrees cooler than in 6th. 6th is the smallest gear and lightest duty so you will only use 6th when empty. When you are running empty 6th-over (6th + Gear Vendors) will get you better fuel mileage and far less engine wear at today’s 75mph speed limits. Not only is the engine turning slower but so are all the engine driven accessories which cuts down on parasitic losses (turning an a/c compressor or alternator slower greatly reduces their wear and load on the engine). Expect 17-22% mileage increases which will pay for the overdrive itself but also realize that the same engine revs that are now taking you just 500 miles will take you 643 miles after the Under/Overdrive is installed – big savings on wear, great improvement in quieting down the engine, and added resale value of the truck.

When reselling your truck point out the fact that your truck has far less wear than the miles indicate – not only is the truck worth more but you can also move the Gear Vendors to a new vehicle through our exchange program for a lot less money than a new unit.

With the cost of today’s fuel, the cost of the truck itself, the great benefits of performance and enjoyment – there is just no good reason not to have a Gear Vendors Under/Overdrive.



Gears Under/Overdrive

Find your transmission and rear gear multiplier below. The Final Drive Ratio shows you how many times the engine turns for one complete turn of the tires. This Final Drive number is also your torque multiplier when in that gear. GEAR VENDORS reputation for being the best is because of its sophisticated planetary construction. This means GEAR VENDORS is the only auxiliary intended as a GearSplitter behind automatics and the nicest to work behind both automatics and manuals. You are able to shift half gears that keep the engine in the power. Any auxiliary that requires you to lift off the accelerator or is not intended to shift frequently is not going to give you this performance.

There is not room here to cover all the details so call the factory to discuss the full benefits demonstrated on these charts.

T-19 4-SPEED MANUAL (Diesel & Gas Final Drive Ratios)
  Axle Ratio Axle Ratio
 Trans RatioFinal Drive RatioTrans RatioFinal Drive Ratio
ZF 5-SPEED (Diesel & Gas Final Drive Ratios)
  Axle Ratio Axle Ratio
 Trans RatioFinal Drive RatioTrans RatioFinal Drive Ratio
5th Overdrive0.763.903.122.700.763.122.70
Double Over*0.593.042.432.110.592.432.11
*Note: Double Overdrive not to be used when towing or loaded.
  Axle Ratio
 Trans RatioFinal Drive Ratio
6th O/D0.723.513.102.952.692.56
Double Over*0.562.742.422.302.102.00
*Note: Double Overdrive not to be used when towing or loaded.

Call or e-mail the factory to find out all the options available in your performance application, 1-800-999-9555.

FORD Application Guide 4-Wheel Drive Manual Transmissions

 ApplicationPrice Code

Price : $3,495.00

Price : $3,495.00

Price : $3,495.00

Price : $3,495.00

Price : $3,495.00

Price : $3,495.00

Price : $3,795.00

Price : $3,795.00

Price : $3,795.00

Price : $3,795.00