mackr1989 Posted October 2, 2014 Share Posted October 2, 2014 Preferences Preferenceswe have a 79 acar 10 wheeler dc9964 with an 8LL. has a 20k front and 58k rear. it tops out at about 65 mph at 2100 rpms. what could this have for a gear ratio and how would i figure it out. Preferences§1234567890-=Backspace Tabqwertyuiop[] Return capslockasdfghjkl;'\ shift`zxcvbnm,./shift English Deutsch Español Français Italiano Português Русский altalt Preferences Quote Link to comment https://www.bigmacktrucks.com/topic/37239-autocar-rear-end-ratio-question/ Share on other sites More sharing options...
j hancock Posted October 2, 2014 Share Posted October 2, 2014 Approx. 5.70 to 5.90 with .74 ODForrmula(rpm X tire size) divided (mph X 336) = ratio Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/37239-autocar-rear-end-ratio-question/#findComment-261799 Share on other sites More sharing options...
2 STICK PUPPY Posted October 3, 2014 Share Posted October 3, 2014 It's probably got 5.29 ... Most every autocar I have ever had and the 2 I still have are 5.29 Quote Link to comment https://www.bigmacktrucks.com/topic/37239-autocar-rear-end-ratio-question/#findComment-261901 Share on other sites More sharing options...
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