66rmack Posted September 17, 2016 Share Posted September 17, 2016 So the rear drive on the super liner is broken and we bought a frame cutoff with the suspension and and a empty front drive and the rear is good and in it. The guy we got the cutoff from said the ratio was 4:42. That's what we need. But the housing is rusty and I cleaned it up but I can't make out any numbers on the tag. Is there any other way to tell? If I pull it out are the gears marked? I want to take the guys word for it but we all know what happens if I did that... Quote Link to comment https://www.bigmacktrucks.com/topic/46885-rear-end-ratio/ Share on other sites More sharing options...
terry Posted September 17, 2016 Share Posted September 17, 2016 (edited) As you look at the front of carrier there is a flat spot to left of input shaft, wire brush this area should be a set of numbers of ratio. terry Edited September 18, 2016 by terry Quote Link to comment https://www.bigmacktrucks.com/topic/46885-rear-end-ratio/#findComment-346005 Share on other sites More sharing options...
66rmack Posted September 17, 2016 Author Share Posted September 17, 2016 56 minutes ago, terry said: As you look at the front of carrier there is a flat spot to left of input shaft, wire brush this area should be a set of numbers of ration. terry Yup i did that but I can't make out any of the numbers. Quote Link to comment https://www.bigmacktrucks.com/topic/46885-rear-end-ratio/#findComment-346017 Share on other sites More sharing options...
Freightrain Posted September 18, 2016 Share Posted September 18, 2016 Are the brakes caged so you can spin the yoke and count the revolutions? 2 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/46885-rear-end-ratio/#findComment-346044 Share on other sites More sharing options...
66rmack Posted September 18, 2016 Author Share Posted September 18, 2016 8 hours ago, Freightrain said: Are the brakes caged so you can spin the yoke and count the revolutions? No they aren't but I can def. do that... Not sure why I didn't think of that. Thank you guys for the help. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/46885-rear-end-ratio/#findComment-346070 Share on other sites More sharing options...
Popular Post Vladislav Posted September 19, 2016 Popular Post Share Posted September 19, 2016 The MOST sharp way to determine a ratio is to remove covers and count the actual number of teeth. You sure can also count revs. But you should keep accuracy along the count. As more sets of revs you do as more sharp figure could be achieved. I.e. you better make 10 or 20 rews and then divide the count to get result correct. 4 Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/46885-rear-end-ratio/#findComment-346237 Share on other sites More sharing options...
Mcrafty1 Posted October 15, 2016 Share Posted October 15, 2016 You say the rear screw is in the cut off? If so, on most rears the numbers you are looking for are stamped on the outer end of the pinion shaft...but I'm not sure about Mack, I've never looked at mine. Quote Link to comment https://www.bigmacktrucks.com/topic/46885-rear-end-ratio/#findComment-348784 Share on other sites More sharing options...
66rmack Posted October 15, 2016 Author Share Posted October 15, 2016 Yup it's in the cut off Hmm I'll check it out its worth a shot, thank you For the info. Quote Link to comment https://www.bigmacktrucks.com/topic/46885-rear-end-ratio/#findComment-348828 Share on other sites More sharing options...
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