GEAR VENDORS makes the highest quality, most expensive overdrive you can buy. We back that with customer service and warranties you do not commonly find in business today. Call us at the factory and you will talk to real enthusiasts that know drivetrains. Our factory people will ask you the details of your vehicle and its use and then recommend our product only if it is going to be exactly what you expected and give you great benefits in your application (which is exactly why we can give a money back guarantee). These factory reps can give you the details of installation and use and send you photos, diagrams, and brochures for free. If you are installing yourself we will ship product direct to you with full factory support. If you would like to have one of GEAR VENDORS 500 nationwide dealers install the product – we will make sure to communicate with the local dealer and get your exact product in his hands for the install day. All or products come with a money back guarantee and a 2 year unlimited mileage warranty (except diesel manual truck and commercial applications see warranty for details). Last but not least — we do not show pictures of racing and then deny your warranty if you race (hard to believe so many companies do just that). All GEAR VENDORS warranties cover you on the street and at the track (though we do require a contingency decal for pro users). Call us at 800-999-9555 and ask for “new product customer service” – get the kind of service you thought was left back in the 60’s.

Australia uses basically the same wiring with the exception for pin 5 and pin 2. The problematic part here is that pin 5 is used for trailer brake which means that if you for some reason connect an Australian trailer to a towing vehicle with ISO wiring you will get into trouble with the trailer brakes being applied as soon as you turn on the lights.[14]

Notice: There was a predecessor to this connector with 13 pins that on a cursory glance is identical to the 15 pin connector but has a different arrangement of the pins.[20] It was not very common but may exist on some vehicles and can result in an unpleasant surprise.

This is why in regions using this connector, trailers on the road are occasionally seen with the rear fog lights on when they should be off. (Vehicle wired for +12V, permanent or via ignition and trailer wired for fog lamps)

On older trailers there's sometimes a 5-wire setup using a 7-pin connector. In these cases exclude connection for right tail light (58R) and rear fog light (54G) and connect the tail lights only to pin for left tail light (58L).[11]

The connectors are designed for 12V systems. Exceptions for the 7-pin connector may exist where they may be used for 6V and 24V.

GEAR VENDORS has been manufacturing overdrives for 27 years. We have been reducing fuel emissions on the most powerful and fuel consuming gas and diesel vehicles for nearly 3 decades before Green House gas emissions became the buzzword they are today.GEAR VENDORS equipped vehicles are responsible for reducing emissions nearly 25% in the average application compared to the non-equipped stock counterpart. With nearly 75,000 units in service we are reducing tons of emissions per day. Whether your purchase of our product is for a brand new diesel truck or a 1960’s muscle car it is nice to know this performance product can substantially benefit the planet and our countries oil dependency.

In Europe, both 7-pin (ISO 1724) and 13-pin (ISO 11446) are common. The 13-pin version being phased in is newer, provides more services than the 7-pin, a more positive locking and also better protection against moisture and contamination.

Torque (times) RPM (divided by 5252) = Horsepower (this can be expressed) Tq X RPM / 5252 = HP. GEAR VENDORS is one of few products that can work both sides of this equation for real performance gains as well as consistent fuel consumption reductions. Gears are multipliers of torque and our Ratio Splitting capability allows you to shift to a gear with more mechanical advantage than the next stock gear in automatic transmissions and wide ratio manuals. This also means engine rpm drops about half what it did without the GEAR VENDORS and so rpm is sustained – higher torque and rpm on shift = more HP. And then shift to an overdrive final and reduce both rpm and torque to reduce the manufacture of HP when steady cruising to improve fuel mileage and decrease wear on the engine and engine driven accessories.

Vehicles and trailers with 6V systems can use the 7-pin or a 5-pin connector, but these are rare today. Heavy trucks that may have 12V systems are usually older (vintage vehicles) or on non-European markets.[1]

Other variants of this connector exists but they are rare.[5] One is used in 24V applications while the other is for ADR use. The difference is how they are mechanically keyed. These connectors are not very common.

Signals in this connector (if following the standard) are not generally legally required (local regulations may still apply), which means that it is not mandatory to connect it if it is present.

Joining the pins for right and left tail lights (58R and 58L) can cause problems on German cars where it is possible to activate Standing Lamps on only one side of the vehicle.[12]

The 5-pin has a design and pin layout that is identical to the 7-pin ISO 1724 connector with the exception for the lack of pin 1 (L) and pin 4 (R). This connector is sometimes present on vintage vehicles and the actual wiring may be completely different from what the standard states which means that measuring before connecting is a good idea.

This connector is common on heavy duty commercial trucks and trailers but is replaced by the ISO 12098 connector on newer vehicles.

There are two main variants of the wiring with a switchover date 1999. The difference is that an additional connection for ground and that battery charging in the trailer is shared with other consumers. This means that if a pre-1999 camper trailer with a battery is connected to a post 1999 vehicle there's a risk that the battery charging won't work.

GEAR VENDORS provides overdrive product to racing cars and trucks up to 2000hp and trucks towing heavy RV’s up to 25,000lbs gcvw. Whether you are trying to move a couple tons up a steep incline or moving just a couple thousand down the track — the fastest way is with the right gearing. Add the benefits of a final overdrive ratio to reduce engine rpm and increase fuel mileage by typically 20-28% and you have a product that is the single biggest innovation you can bolt to your car or truck. With fuel costs high the overdrive can pay for itself in mileage and engine wear reductions. That makes the driving pleasure of overdrive, and performance improvements free — and then the vehicle is also worth more when/if you ever sell it with the GEAR VENDORS. In the long run it just doesn’t cost you anything to own a GEAR VENDORS UNDER/OVERDRIVEâ„¢. For an in-depth discussion on which vehicles can expect these mileage gains see our “common questions” section on the web site.

The color coding is defined in ISO 4141-3, but the standard color codes are not always followed and may be different for a particular vehicle.

Related to fuel economy, performance, and emissions — GEAR VENDORS overdrive kits include electronics that keep the vehicle in the optimum performing gear. Whether you are driving a older non-computer controlled vehicle or a late model with all the latest emissions computers our electronics provide the interface to ensure maximum performance and correct rpm without lugging or overreving in the wrong gear. The OE factory programming remains intact and our processor just makes it aware of the actual ratio 1,000 of times per second. In older vacuum or throttle linkage transmissions the stock governor on the output shaft instantly slows down the moment the overdrive shifts and so automatically moves the shift point in any overdrive gear up by the correct 28.6%. So both electronic and non-electronic automatic transmissions gain a group of features including a passing gear or climbing gear that is automatically available without driver intervention and is at the split between 2nd and 3rd where you really want it. Electronic options also exist for racing and performance use such a paddle-shifters with our programming already installed by companies like MasterShift, and our AutoShift Sequencer that can work with stock and aftermarket shifters just like many of the race teams use. Our standard AutoDrive electronic however do include several great features for a combination of street/strip use including AutoLaunch for both manuals and automatics.

A number of ISO standards cover trailer connectors, the electrical connectors between vehicles and the trailers they tow that provide a means of control for the trailers. These are listed below, with notes on significant deviations from them that can cause problems.

The physical design is also used by SAE J560 with basically the same configuration. The difference is that SAE J560 uses 12V (larger wire cross-section and higher amp rating on fuses). Pin 7 may also have a different behavior on SAE J560.[23][24][25]

The purpose of this connector is to supplement the 12N (ISO 1724) connector for power supply of consumers common in caravans (Travel trailers).[16] This is used in Great Britain but may also be used in other areas of Europe.

2 world records in Drag Racing, 4 Off Road Racing Titles, and several Land Speed records all benefit from GEAR VENDORS ratio splitting performance. At the same time this ratio splitting makes less work for the main transmission in the vehicle to then advance to the next gear (less ratio change) and thus the main transmission itself becomes more reliable. This is a great benefit at the track or on the highway. Whether your interest is motorsport or recreation — you cannot buy a more proven product.

This connector is basically the same as the 12N (ISO 1724) connector, but the center pin (pin 7) has changed gender to make the plug and outlet unique. Socket is replaced with pin in the plug, pin is replaced with socket in outlet.

This connector is present on newer heavy duty commercial trucks and trailers following the ISO standard and is intended to replace the combination of connectors according to standards ISO 1185 and ISO 3731. The 15-pin connector is not designed to replace the ISO 7638 connector.[18]

OEM means that new vehicles have come factory equipped with GEAR VENDORS as original equipment. When GEAR VENDORS first started producing the DeNormanville planetary overdrive in 1979 there were no American vehicles with overdrive. Only the import cars with manual transmissions had an overdrive gear. Through the years we have worked with Ford, GM, and Chrysler and our products have come factory on everything from one of Americas fastest production cars (GM’s TwinTurbo Callaway Corvette) to Americas largest RV manufacturer (Fleetwood Motorhomes). In 1981 we won our first Best Engineered award from SEMA (the largest automotive aftermarket organization). GEAR VENDORS is without question the most awarded and recognized aftermarket transmission product.