Speedometer Drive Gear Assembly Witness Mark for a 727 Transmission Diagram
Description
# 727518. With these four parts you can convert your 727 manual to a 518 overdrive transmission with locking torque converter. What this kit does is makes a 518 transmission shift without a computer. Lets say you drive an average of 400 highway miles per week, at that rate y'all could relieve equally much as $thou.00 per twelvemonth on gas, not to mention the 31% reduction in RPM. Your new 518 will have automatic shifts into overdrive and lock-upwards, no toggle switch needed. Now with an adjustable vacuum switch pick. As of July 2019 we have sold thousands of these kits without one complaint to my knowledge. The instructions are at the bottom of this page. (11-25-06. I just saw this kit on the Cyberspace by the copy cat competition for $1654.00.)
Dodge 518 Conversion 
This is how to replace your 3 speed manual with a 1995 dorsum A518 overdrive transmission with a iii wire connector (gas). A 518 transmission has a 31% overdrive and will produce a 30 to 40% increase in gas mileage on the road over a three speed transmission. Remember overdrive is only third gear high range anyway. There are ii wire 518 transmissions out there, these have a non-lock-upward torque converter. With this three wire setup you lot take a iv speed transmission plus a torque converter lock-upwards characteristic. The extra gear is 3rd loftier range. Nosotros've been asked this question for years, so I decided to put information technology downwardly in black and white. What we're actually going to do here is control the overdrive and torque converter lock-up usually controlled by the computer using 1 vacuum switch and two oil pressure switches. Instead of using an electronic speed sensor and throttle position sensor we will use a mechanical / hydraulic / electronic speed sensor and a vacuum / electronic throttle position sensor. This will be accomplished with the utilize of 3 parts and some trick wiring. The Chevy and Ford guys make the swap to overdrive all the time, it's time for the Dodge people to have the aforementioned option. Lets say you drive an average of 400 highway miles per week, at that rate you could save as much as $one thousand.00 per yr on gas. This can be made to piece of work with a diesel motor also with or without a vacuum pump and vacuum regulator.
#1. The center wire on the manual is the hot wire and the two other wires are ground wires for overdrive and the lock-up torque converter. The front end wire is the overdrive ground and the rear wire is the torque converter lock-upwards footing. You tin get a 3 wire female connector from a junk chiliad or buy ane from us.
#ii . Run a 12 volt fused wire that turns on and off with the key to the vacuum switch, and then to the eye wire on the transmission connector. This is a normally open up vacuum switch that takes 7 inches or more of vacuum to shift into overdrive and lock-upwards the torque converter and 3 inches or less of vacuum to downwardly shift and unlock the torque converter. Lets say you're in overdrive going 54 miles per hour at very lite throttle, when you lot press on the throttle and the vacuum drops below 3 inches the transmission will immediately shift back to 3rd gear low range without lock-upward or fifty-fifty a lower gear depending on the throttle position. (There'due south a small fault in the film. The fuse goes on the battery side of the vacuum switch.)
#three. At the governor pressure tap on the transmission install a tee fitting for ii oil pressure switches. Say a 44 PSI oil pressure switch for overdrive and a 52 PSI oil pressure switch for the torque converter lock-up. Or whatever other combination of switches yous may want. At light throttle the transmission will shift into overdrive at 44 MPH and the torque converter will lock-up at 52 MPH. The pressure switches become on the outside of the manual instance in the governor pressure level port. It'due south located on the right side, at the upper rear of the master manual case. The figures on the pressure switch will only exist right if you lot take a stock tire size and rear cease ratio.
#4. Run a wire from the front pivot on the transmission connector to the 44 PSI oil force per unit area switch and a second wire from the rear pin on the manual connector to the 52 PSI oil force per unit area switch. Now at 52 MPH when yous step on the gas the transmission will shift back to tertiary gear and the torque converter will unlock at the same time. Information technology can't get any easier than this.
#5. Install a toggle switch in the overdrive basis wire. When the switch is turned off you volition have 1st, second and tertiary low range, exactly like a 727 transmission with the same ratios. When the switch is turned on you will have 1st, 2d and 3rd gear low range plus 3rd high range. When the toggle switch is on the manual will immediately shift into overdrive at light throttle over 44 miles per hour whenever it'southward in drive range on the gear selector. Once in overdrive the transmission will non come out of overdrive until the overdrive solenoid is turned off, or the vehicle speed goes below 44 miles per hour, or the vacuum drops below 3 inches. The merely electronic parts on a 518 transmission are the overdrive and torque converter lock-up solenoids.
Notation : People make this swap all the time, just I've never heard of anyone doing it correctly. They drive down the street flipping a toggle switch on and off at every stop. This setup works automatically.
NOTE : The way governor pressure works is 1 pound of pressure per foursquare inch equals one mile per hour unless someone has inverse the tire size, or rear end ratio, or governor springs and weights. The vacuum switch acts as a throttle position sensor and the oil pressure switch acts as a speed sensor.
Annotation : Use a lock-up type torque converter if possible, this could get you as much as 5% ameliorate gas mileage and the transmission will run much cooler. Running libation will brand the transmission last longer.
Annotation : You can also run the torque converter basis wire through the brake switch if needed.
The #4 tap is the correct one.
Throttle Valve Adjustment
#6. A 518 transmission has a throttle valve cablevision (pressure level cable), it must be hooked upwardly and adjusted correctly. You tin can get the cable and brackets from a junk m. If you have a 727 manual now this linkage may work. The correct aligning on the T 5 cablevision or linkage is minimum throttle pressure at minimum throttle. In other words no slack in the cable at idle and it must offset to pull immediately off of idle.
Other Modifications
#vii. When going from a 727 transmission to a 518 manual the driveshaft will need to be cut about 3 and i/2 inches. The bandy may crave some driveshaft tunnel modification on some cars. Yous will have to fabricate a new crossmember using the old crossmember ends considering the transmission mount is lower on a 518 transmission than a 727 transmission. The stock Contrivance truck mountain is very alpine, some extra room tin can be gained by using a biscuit-type Camaro or Mustang mount. See pictures below. In the 1st picture notice the 518 transmission has a larger tail expanse. The second picture is the crossmember ends cut off ready to exist reused. In the 3rd picture notice the transmission mount area has been lowered.
On the adjustable oil pressure switches the "C" post goes to ground, the "NO" post goes to the solenoid and the "NC" post has no wire.
The 3 to a higher place pictures are a 1970 Dodge Dart Swinger A-Body.
Click Here, if you have a diesel without vacuum.
If yous haven't noticed Chrysler Cars are the hottest thing going on the market as witnessed by the 1970 Plymouth Hemi Cuda that sold for $two,000,000.00 at the Barrett-Jackson sale on i-21-2006.
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Speedometer Drive Gear Assembly Witness Mark for a 727 Transmission Diagram UPDATED
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