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Overdrive Unit, Dodge 3 Speed Auto TF-727 & TF-904
YOU WANT A GEAR VENDOR YOU GET ALL THESE BENEFITS & MORE |
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| Dodge 3 Speed Automatic Truck/Motorhome | Dodge A-727 3 Speed Automatic Final Drive Ratio | |
| Dodge 3 Speed Automatic Performance Car/Street Rod | Dodge 3 Speed Automatic Application Chart & Pricing | |
| Dodge RAM Horsepower and Torque | ||
Dodge 3 Speed
Automatic Truck/Motorhome
With the Gear Vendors dashswitch in “auto” you will have automatic overdrive just like the vehicle came with a factory system. The dashswitch can either be mounted in our underdash bezel or the custom indash bezel like the Feetwood Limiteds that came factory with the Gear Vendors. The Gear Vendors will shift in and off without attention of the driver and can be used while towing up to combined weight of 30,000 lbs. An interactive floorswitch is positioned for the left foot (just like a headlight dimmer) to give manual control at any given moment so that you can turn the overdrive on/off for performance and gear splitting. Performance while accelerating or climbing grades is greatly improved by the availability of 6 forward ratios (see final drive ratios page 12). With approximately 1/2 the drop in engine rpm on each gear change and the ability to downshift at 1/2 the intervals (much sooner than with the stock only transmission) performance gains of over 40+ horsepower and 60lb ft. of torque are typically minimum.
Most importantly you are getting this horsepower and torque without modification in any way to the engine. Any other way of increasing power (chips, induction, exhaust, fuel) all put stress’s beyond the original equipment. With the Gear Vendors UNDER/OVERDRIVE you get this power because gears are multipliers of torque, plus the engine can be kept in a narrower (better performing) rpm range when power is needed. For this reason, if you do have performance modifications the Gear Vendors also helps them work to their maximum potential. Not only do you get performance without engine modification, but the overdrive will pay for itself in fuel mileage alone. Add to this the savings in wear you get from slowing the engine down 22% so that the same rpms that currently take you only 500 miles will now take you 640 miles.
Most vehicles will experience mileage increase in the 20 percent region if driven at the same top speeds as they are without the Gear Vendors. Increased mileage and reduced engine wear is why all vehicles today come with factory overdrive
The gear vendors UNDER/OVERDRIVE will do more for this vehicle
then any Underdrive or Overdrive on the market. You will get all the features normally
associated with an underdrive except a gear below first, plus all the economy of
overdrive. Because our overdrive is the only product you can shift under throttle
you will have far greater performance and economy. This overdrive comes with the
best money back guarantee (see warranty for details). There is not room here to discuss
every situation that arises where additional gears and torque multiplication help
your vehicle perform. Look at the final drive ratio page and then call and get one,
you will wonder how y0u ever got along without it.
Dodge 3 Speed Automatic Performance
Car/Street Rod
At about 2200 dollars (depending on models) the Gear Vendors is not the cheapest
way for you to get overdrive (a rebuilt wreaking yard 518/618 is probably cheaper)
but our overdrive is by far the best way. Horsepower handling is the first issue.
A Gear Vendors will handle 1200+ horsepower reliably. This is why you have seen ur
overdrive in 8 second 1/4 mile cars in publications like Hot Rod and National Dragster.
This is also why all GM Callaway Corvettes with automatics came with a TH400 and
Gear Vendors instead of the base Corvette 4-speed auto. As did all the newer Jensen
Interceptors. If you’re running more then 1200 horsepower (and we have customers
that are) then talk to us at the factory as there are some hydraulic changes we do
for vehicles up to 2000hp.
Horsepower aside, there are several other reasons you will prefer a Gear Vendors to any factory overdrive automatic. You will have a dashswitch that allows both manual ad automatic operation. With the switch in “auto” the vehicle will act just like it came from the factory with overdrive. The overdrive will kick in at 47 mph or whatever the EPROM is set for in our electronics and turn back off at slower speeds without attention of the driver. The ratio is .78 to 1 (see the final drive ratio charts on page 7). This equates to 28% faster vehicle speed at the same rpm. Or, take your existing rear gear multiplied by .78 (i.e. 4.10 X.78=3.20). In this example a vehicle with a 4.10 behaves just like it had 3.20s when the overdrive is engaged. This is just the right amount of overdrive as any taller would require a lock up converter or create excessive converter slippage. With the .78 to 1 ratio you’re good with any torque converter you chose for high performance street/strip use.
Another great feature of the Gear Vendors is that you will have a full 6 forward ratios when you switch to manual on the dashswitch. Pull into low, accelerate, then hit our button (on the shifter or the floor), a green light appears indicating overdrive and your in first over which is right between 1st and 2nd . Then shift to 2nd and turn us off. Then rev back up and hit the button for 2nd-over. Then 3rd and 3rd-over. See more information on Gear Splitting in the Drag Racing section. The performance and sound of the motor is tremendous as it goes through 6 full throttle close ratio shifts. You are in each gar 1/2 the time you are now so the car is not only faster but it also feels and sounds much faster.
Check out the unlimited horsepower warranty and the simple installation in the dimensions section. Then order by calling (800) 216-1632
Dodge/Dodge Ram Final Drive Ratios
Find you transmission and rear gear multipliers above.
The Final Drive Ratio shows you how many times the engine turns for one complete
turn of tires. This Final Drive number is also your torque multiplier when in that
gear. Gear Vendors reputation for being to best is because of its sophisticated planetary
construction. This means Gear Vendors is the only auxiliary intended as a gear splitter
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 of the accelerator or is not intended to shift frequently
is not going to give you this performance.
DODGE/DODGE RAM Horsepower and Torque
If you study these performance curves you will see two
major benefits of gear splitting. As an example we’ll use the A727 Trans chart with
a 5.9 24 valve engine and a 4.10 rear axle. Gears are multipliers of torque so at
2,000 rpm in 2nd –over the torque multiplier is 4.64 where without the GEAR VENDORS
you would get into 1560rpm in 3rd-direct at 4.10. The difference in engine torque
is only 10lb-ft. But the difference in the multiplier is 4.64 vs. 4.10. That’s over
13% more working torque.
At this same moment horsepower at 2,000rpm is 170 instead of 125 @ 1560 which is over 36% more horsepower with all the reliability of you stock powerplant. To figure the drop in rpm or torque multiplier from on gear to the next calculate as follows: Final Drive Ratio of the gear you are shifting to , divide by the gear you are shifting from, minus 1, times 100. The difference from 1st over to 2nd is ever more dramatic. This is why if you are towing or loaded heavily, the best way to reliably improve performance is with the GEAR VNDORS UNDER/OVERDRIVE. It’s the same reason the big 18 wheelers have 2 and 3 speed auxiliaries for 10 to 15 gears.
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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Drivetrain Specialists of Las Vegas
Las Vegas NV, 89102
