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Frequently Asked Questions

Transmission Lookup


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The clutches in the Allison 1000 transmission are given numbers to help with their identification. There're two sets of rotating clutches, C1 and C2. And there're three stationary clutch sets C3, C4 and C5. They control three sets of planetary gears. The following apply chart shows the clutches and their operational states.

First Gear

C1 and C5 Applied

3.10 to 1

Second Gear

C1 and C4 Applied

1.81 to 1

Third Gear

C1 and C3 Applied

1.41 to 1

Fourth Gear

C1 and C2 Applied

1.00 to 1

Fifth Gear - "Overdrive"

C2 and C3 Applied

0.71 to 1

Reverse

C3 and C5 Applied

4.49 to 1

             6 Speed Version Allison 1000 5 Speed Allison 2000           
1 2 3 4 5 6 R
3.10 1.81 1.41 1.00 0.71 0.61 4.49
1 2 3 4 5 R
3.51 1.90 1.44 1.00 0.74 5.09
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