The A518 is slightly longer than the 727 as a result of the overdrive unit mounted in the tailhousing. Overdrive engagement and torque converter lockup rely on electronic solenoids while the 1, 2, 3 shift sequence is controlled entirely by hydraulic governor pressure. Due to the electronic OD and lockup, an electronic control module - single module engine controller, or SMEC - is required for proper function of these systems. An easy way to distinguish an A518 from an earlier 727 is to look for an electrical connector on the driver side of the transmission; the A518 will have one, while the 727 will not.
Chrysler A518 Transmission Specs & Ratios
Type: |
4 speed overdrive, automatic |
Applications: |
1991 - 1993 Dodge D250, D350, W250, W350 |
Predecessor: |
Chrysler TorqueFlite 727, 3 speed automatic |
Case Material: |
Cast aluminum with integrated bellhousing |
Case Length: |
~ 37 inches |
Weight: |
~ 170 lbs |
1st Gear Ratio: |
2.45 : 1 |
2nd Gear Ratio: |
1.45 : 1 |
3rd Gear Ratio: |
1.00 : 1 |
4th Gear Ratio (OD): |
0.69 : 1 |
Reverse Ratio: |
2.35 : 1 |
Fluid Type: |
MOPAR ATF+4 automatic transmission fluid [1] |
Fluid Capacity: |
14.5 - 16.5 quarts total capacity, ~4.0 quarts service refill capacity |
Filter P/N: |
|
Fluid Pan Gasket P/N: |
|
Service Intervals [2]: |
Replace transmission fluid and filter every 30,000 miles |
Features: |
• Based on Simpson planetary gearset design • Electronically controlled torque converter lockup • Electronically controlled overdrive • Four speed derivative of the Chrysler TorqueFlite 727 • Referred to as the 46RH after 1992 when Chrysler's transmission model designation format was changed |
Identification: |
|
[1] MOPAR ATF+4 supersedes all previous (and defunct) automatic transmission fluid specifications
[2] Service intervals as identified by the 1991 - 1993 Dodge service manual; recommend servicing transmission at band adjustment intervals for convenience.