DODGE 4-Speed Automatic
Performance Car / Street Rod / Sport Truck
The 518/618/47RH factory overdrive transmission was designed for improving Dodge's CAFE (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 that give you approximately half the drop in 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 the GEAR VENDORS gives an alternative overdrive
ratio to the very tall factory gear and the GEAR VENDORS can be used with virtually
unlimited horsepower (if it is 1200hp or less it gets the standard product). If you have a car or
hotrod truck also read the 3-speed 2 wheel drive section. If you have a truck used for towing read also the
4-speed automatic truck section.
DODGE/DODGE RAM FINAL DRIVE RATIOS
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 let 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.
| 518/618/47RH 4-SPEED AUTOMATIC |
| |
|
Axle Ratio |
| |
|
4.56 |
4.10 |
3.90 |
3.54 |
| |
Trans Ratio |
Final Drive Ratio |
| 1st |
2.45 |
11.17 |
10.05 |
9.56 |
8.67 |
| Over |
1.91 |
8.71 |
7.84 |
7.46 |
6.76 |
| 2nd |
1.45 |
6.61 |
5.95 |
5.66 |
5.13 |
| Over |
1.13 |
5.15 |
4.64 |
4.41 |
4.00 |
| 3rd |
1.00 |
4.56 |
4.10 |
3.90 |
3.54 |
| Over |
0.78 |
3.56 |
3.20 |
3.04 |
2.76 |
| 4th Dodge O/D |
0.69 |
3.15 |
2.83 |
2.69 |
2.44 |
| Double Over |
0.54 |
2.46 |
2.20 |
2.10 |
1.90 |
Call or e-mail the factory to find out all the options availalbe in your performance
application.
1-800-999-9555
DODGE/DODGE RAM 2-Wheel Drive Truck/Van 4/5 Speed Automatics
| Call Factory for Application |
GEAR VENDORS, INC. 1717 North Magnolia Avenue, El Cajon, CA 92020
Toll Free 800-999-9555 • Telephone (619) 562-0060 • Fax (619) 562-1186
|
