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Message: <blockquote data-quote="Lessen" data-source="post: 663415" data-attributes="member: 4622">Lemme see what I can dig up.well, first off it depends on which tranny is being used. I have the old school 2.5 tranny and with the 1/8 diffs my gear ratios are..1st gear: 7.7722nd gear: 5.307 however, these ratios do not include the spur/CB ratio. I have an 18T CB and I'm working on having custom spurs made which will be 54, 56, 57,58 and 60 tooth.A standard box stock 2.5 TMaxx has a 2nd gear ratio of 16.1:1I will be at 16.511 with an 18T C/B and 56T Spur.. now mind you these are 1.0 module cut clutch bell and spur, not 32 pitch or whatever Traxxas uses in the TMaxx.Basically, I'm building my truck to be a torque monster <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />A Box stock TMaxx 2.5 1st gear is 24.1 : 1Mine with RB ST28 & 60T c/b will be 25.91 : 1 AND that's with a .28 engine, not a .20I should be able to pull teeth with it <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />if someone can dig up the stock diff ratio (or even just the number of teeth on the ring and pinion) we can figure out what change would need to be made with Traxxas parts to compensate.</blockquote>

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