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Revo 2.5 transmission

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It should work ok. I see a few difference between the old one and new one in the parts explosion, but can't search up some of the old part numbers as they dropped them off their list to view on traxxas.com. The main difference was the 3.3 revo used the wide ratio gears for the two speed and the 2.5R revo used the standard ratio. They also had a narrow ratio. I preferred the standard even with a big block revo. The wide ratio was like being in a 1:1 car and shifting from 1st gear to 3rd gear (not that excessive, but noticeable). Gives you the same first gear speed, but a bit faster 2nd gear speed at the cost of acceleration. But the 3.3 engine had more power, so the loss of acceleration wasn't noticed.
 
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