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Overdrive Unit, Dodge 4 Speed Auto A-518, A618 & 47RH
YOU WANT A GEAR VENDOR YOU GET ALL THESE BENEFITS & MORE |
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The 4-speed automatic is basically the old venerable 727 with an overdrive bolted on as a tail case. The first thing you may have noticed is that the drive ratio of the factory transmission is very tall (.69). The Gear Vendors .78 to 1 ratio will not hunt (shifting back and forth under load) and will also reduce temperatures in the main transmission by as much as 100 degrees on warm days. Consequently all our customers tow in the GV ratio and greatly extend the life of the trans. Trucks running empty can make use of double overdrive for great economy and extended engine life.
Gear Splitting is the feature that allows the UNDER/OVERDRIVE to shift between the gears. You will now have approximately 1/2 the drop of engine rpm from one gear to the next when you want power. This is why a Gear Vendors will give you more power than any underdrive or overdrive on the market (see common questions). By keeping torque multiplication higher and engine rpm narrower you increase engine performance by typically more then 40hp and 60lb ft. of torque without any modifications to the engine (see Final Drive Ratio charts and Horsepower and Torque curves in this section) (see also common questions on performance modifications).
This is why big trucks ( Kenworths etc.) use gears (most 18 wheelers have 15 to 21 gears) instead of modifications. Because gearing gives them performance which actually improves the reliability of the engine. The heavier you are loaded the more you need a Gear Vendors.
If you already have engine modifications ( chips, exhaust, fuel increases, etc.) the Gear Vendors will let you get the most from them through working in narrower rpm ranges when loaded and also by adding torque multiplication to make it easier on the engine and trans.
The Gear Vendors comes with a 2-year unlimited mileage warranty ( on non commercial applications ) and a 30 day money back guarantee that you will love the performance (see warranty for details). The Gear Vendors is the only after market performance device or auxiliary transmission that comes as original factory equipment on new cars, trucks, vans or motorhomes. Over 1 million in the 80’s and 90’s were installed by manufacturers on vehicles; i.e.; Ford Diesel Transit Vans (European market), Volvo gas and diesel, Fleetwood, Allegro, Rexhall, Monoco and others motorhomes and GM’s Twin Turbo Callaway Corvette.
If you’re vehicle is heavily loaded or you just love performance
the Gear Vendors is the ultimate option. Call our customer service line @ (800) 216-1632.
DODGE 4-Speed Automatic Performance
Car/Street Rod/Sport Truck
The 518/618/47RH factory overdrive transmission was designed for improving Dodge’s
CAFÉ (Corporate Average Fuel Economy) ratings. Because of this it has a very
tall .69 overdrive ratio. The Gear Vendors fixes the wide ratio problems so that
when you want performance you have a gear between each of the factory ratios. This
gives you approximately half the drop in the engine rpm and torque multiplication
(see final drive ratios).
You can easily have increases in horsepower in the 50+ range and torque boosts of 70lb ft. just by gear splitting. With 8 forward gears available the motor stays in a narrow rpm band of performance. The .78 ratio of this overdrive gives an alternative overdrive ratio to the very tall factory gear and the Gear Vendors can e used with virtually unlimited horsepower (if 1200hp or less it gets the standard product). If you have a car or hotrod truck, also read the 3-speed 2wd section. If you have a truck used for towing, read also the GM 4-speed automatic truck section.
Check out the unlimited horsepower warranty and money back guarantee and the simple installation in the dimensions section. Then order give us a call..
In addition to the overdrive units, we also provide an impressive
list of automotive after market products for car, pickup truck, SUV and 4wd repair
parts and accessories that includes rear
end covers, ring and pinion
gears, OE clutches and heavy duty performance
clutches, diesel gauge kits, exhaust brakes,
re manufactured manual
and automatic transmissions
and both manual
and automatic
overhaul kits. Other products we offer for the RV recreational vehicle market include
REMCO drivelinedisconnects,
tow bar and baseplates and
positraction units to improve vehicle performance and save fuel. We have a complete
4 wheeling drivetrain product
line including complete differential assemblies, limited
slip and other solid
locking positractions. We offer transmission conversion
kits including the NV4500
and NV5600 as well as replacement
kits for light duty GM and Jeep transmissions. You may be interested in visiting
our Ford and Powerstroke Diesel
page, Dodge Ram and
Jeep pages for detailed
information.
Watch for future additions of new products to be added to our on-line catalog including advanced wheels, tires, engine tune-up kits and other accessories.
Need more information call 1-800-216-1632 talk
to a knowledgeable technician.
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to our registered Internet customers, click below to register and receive advance
notice of new products, special bonus offers and to be eligible for our free random
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Drivetrain Specialists of Las Vegas
Las Vegas NV, 89102
