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PRO-SHIFT™ 18-Speeds
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The new line of double overdrive PRO-SHIFTTM 18-Speed transmissions is unmatched when it comes to ratio coverage, fuel economy, versatility and reliability. At 2,050 lbs-ft of torque, the new PRO-SHIFT 18-Speed transmissions were built to tame the torque delivered by today's high-performance diesel engines. |
Overall ratio coverage of 21.27 provides excellent startability and gradeability without sacrificing fuel economy, thanks to a double overdrive with a final ratio of .70. A deep first gear ratio of 14.89 is sure to get even the heaviest loads moving with minimal effort. The patented OPTI-LUBETM system keeps things cool, even on those long uphill grades.
PRO-SHIFT 18-Speed transmissions are ideally suited for over-the-road applications where heavy loads and steep grades are common.
Features:
- Overall ratio 21.27
- Low 1st gear
- Double overdrive
- Range synchronizer
- Isolated shift lever
- Electro pneumatic shift control
- Common shift pattern
- Variety of PTO mountings
- Patented OPTI-LUBE design
- Aluminum clutch housing
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How can we assist you with your specific requirements?
If this information is insufficient to select a transmission model, please use this
Medium- and Heavy-Duty Application Engineering Form
to supply your specifications. Our application engineers will be glad to customize and
recommend a model for you. |
To print or download a PDF version of this page, please click here or on the
icon found above each table below.
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Model No. |
Length
(in) |
Weight
(lbs) |
Lube Cap.
(liters) |
Torque Cap.
(lbs-ft) |
Overall
Ratio |
Reverse
Gear |
Gear Ratios |
R1 |
Low Gear |
Top Gear |
PSDO165-18 |
37.7 |
794 |
13.9 |
1,650 |
21.27 |
15.64 |
14.89 |
0.70 |
PSDO185-18 |
37.7 |
794 |
13.9 |
1,850 |
21.27 |
15.64 |
14.89 |
0.70 |
PSDO205-18 |
37.7 |
794 |
13.9 |
2,050 |
21.27 |
15.64 |
14.89 |
0.70 |
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Model No. |
Reverse Gear Ratios |
Gear Ratios |
R1 |
R2 |
R3 |
R4 |
1st |
2nd |
3rd |
4th |
5th |
6th |
7th |
PSDO165-18 |
15.64 |
13.03 |
3.72 |
3.10 |
14.89 |
12.41 |
10.40 |
8.66 |
7.32 |
6.09 |
5.05 |
PSDO185-18 |
15.64 |
13.03 |
3.72 |
3.10 |
14.89 |
12.41 |
10.40 |
8.66 |
7.32 |
6.09 |
5.05 |
PSDO205-18 |
15.64 |
13.03 |
3.72 |
3.10 |
14.89 |
12.41 |
10.40 |
8.66 |
7.32 |
6.09 |
5.05 |
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Model No. |
Gear Ratios |
8th |
9th |
10th |
11th |
12th |
13th |
14th |
15th |
16th |
17th |
18th |
PSDO165-18 |
4.21 |
3.54 |
2.95 |
2.47 |
2.06 |
1.74 |
1.45 |
1.20 |
1.00 |
0.84 |
0.70 |
PSDO185-18 |
4.21 |
3.54 |
2.95 |
2.47 |
2.06 |
1.74 |
1.45 |
1.20 |
1.00 |
0.84 |
0.70 |
PSDO205-18 |
4.21 |
3.54 |
2.95 |
2.47 |
2.06 |
1.74 |
1.45 |
1.20 |
1.00 |
0.84 |
0.70 |
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Model No. |
On-Highway (1) |
Off-Highway |
Off-Shore |
GVW
(lbs) |
Torque
(lbs-ft) |
GVW
(lbs) |
Torque
(lbs-ft) |
GVW
(lbs) |
Torque
(lbs-ft) |
PSDO205-18 |
150,000 |
2,050 |
110,000 |
2,050 |
(4) |
(4) |
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| Notes: |
| (1) 4x4, 6x6 and/or military applications are considered off-highway. |
| (4) Contact transmission engineering for approvals. |
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Non-Synchronized (PRO-SHIFT Models) |
Temperature |
SAE Grade |
Class/Type |
All |
50 |
Synthetic Transmission Oil
Spicer Specification MS-961-T |
Above 0°F |
50 |
HD Engine Oil
Mil-L-2104D or E
API-CD, CE, SF or SG
Cat TO-4 |
Below 0°F |
30 |
Above 0°F |
80W-90 |
Automotive Gear Oil
API MT-1 |
Below 0°F |
75W |
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| Notes: |
| EP gear oils are not recommended for operating temperatures above 230°F. |
| Do not mix engine, transmission or gear (axle) lubes. |
| Synthetic SAE 50 required for applications above 399 Horsepower. |
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Change Intervals |
Type |
On Highway |
Off Highway |
Mineral |
1 year or 100,000 miles |
Every 1000 Hours |
Semi-synthetic |
2 years or 250,000 miles |
Every 1000 Hours |
Synthetic |
5 years or 500,000 miles |
Every 1000 Hours |
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