67RModel Posted January 15 Share Posted January 15 12 hours ago, Twins said: can I change the 10 speed to a 13 speed having 4.17 rears Yes you can. However, your driveshaft will need to be shortened as the 13 speed is longer overall. 12 hours ago, Twins said: Will I see improved speed without having rpm so high?? No. Generally speaking modern Eaton transmissions all have the same overdrive ratio of 0.73. I assume you mean cruising in top gear...... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/39878-might-be-getting-a-ch-427/page/2/#findComment-545124 Share on other sites More sharing options...
dexter860 Posted February 10 Share Posted February 10 On 1/14/2024 at 6:41 PM, Twins said: I have a question…I have a 1999 ch 427 it has an Eaton 10 speed and 4.17 rears…can I change the 10 speed to a 13 speed having 4.17 rears? Will I see improved speed without having rpm so high?? 🤷🏽♂️🤷🏽♂️ The final gear ratio in a 10speed overdrive and a 13 speed is the same , won't give you a higher gear , just more in between. Quote Link to comment https://www.bigmacktrucks.com/topic/39878-might-be-getting-a-ch-427/page/2/#findComment-546419 Share on other sites More sharing options...
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