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Transmission question

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I was wondering if someone could tell me what the difference is between a T-2180 and a T-318 transmission. I'm wanting to replace my eaton 10 speed with a mack 18 speed and I'm trying to decide which I should try to find. Thanks.

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Gear and sliding clutch engagement teeth are smaller on the T318. T3s have a different HI/Lo shift cylinder with less parts. Both of these are suppose to improve the shifting.

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T2180 is the 2nd generation triple countershaft transmission and has been out of production since 2002-2003 timeframe. T318 is the current production (3rd generation) 18 speed triple counter-shaft transmission. There are different versions of 18 speeds in both T200 & T300 series with slightly varying ratios (For example there is T318, T318LR, T318 21 and T318LR21; The LR's have creeper gears and 21's are capable of 2100lb-ft as against 1800 lb-ft torque engines).

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