rick harper Posted March 15, 2012 Share Posted March 15, 2012 When replacing a ring gear and pinion, the carriers are stamped from the factory with the ratio size. But, what happens when someone changes that and doesnt restamp the carrier. You might have installed the wrong ratio. Here is the formula to check your ratio before buying the wrong part.1, count the teeth on the ring gear.2. count the teeth on the pinion3. divide the pinion into the ring gear.4. next count the teeth on the bull gear5. also count the teeth on the helical cross.6. divide the helical cross into the bullgearEXAMPLE: ASSUME THE CARRIER IS STAMPED 3.65Ring gear 17 teethpinion gear 16 teeth17 divided by 16=1.0625Bull gear 55 teethhelical cross 16 teeth55 divided by 16=3.4375Now multiply 3.4375 by 1.0625=3.65234375 or 3.65 ratio 2 Quote Link to comment https://www.bigmacktrucks.com/topic/23869-ring-gear-ratio/ Share on other sites More sharing options...
Rob Posted March 15, 2012 Share Posted March 15, 2012 When replacing a ring gear and pinion, the carriers are stamped from the factory with the ratio size. But, what happens when someone changes that and doesnt restamp the carrier. You might have installed the wrong ratio. Here is the formula to check your ratio before buying the wrong part.1, count the teeth on the ring gear.2. count the teeth on the pinion3. divide the pinion into the ring gear.4. next count the teeth on the bull gear5. also count the teeth on the helical cross.6. divide the helical cross into the bullgearEXAMPLE: ASSUME THE CARRIER IS STAMPED 3.65Ring gear 17 teethpinion gear 16 teeth17 divided by 16=1.0625Bull gear 55 teethhelical cross 16 teeth55 divided by 16=3.4375Now multiply 3.4375 by 1.0625=3.65234375 or 3.65 ratioVery informative and thanks.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/23869-ring-gear-ratio/#findComment-107554 Share on other sites More sharing options...
Olivetroad Posted March 15, 2012 Share Posted March 15, 2012 I just printed it off to keep - Thanks for posting! Quote Link to comment https://www.bigmacktrucks.com/topic/23869-ring-gear-ratio/#findComment-107575 Share on other sites More sharing options...
Vladislav Posted March 25, 2012 Share Posted March 25, 2012 Just the easy thing - mathematic.There is another way - to lift one wheel and turn it full ower counting revolutions of a pinion.Next divide the number into 2 because the only 1 wheel turns and the other one stay in position - diff multiplys by 2.To have better result - make 10 revs. of a wheel and divide the number of pinion circles into 10 and 2. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/23869-ring-gear-ratio/#findComment-110175 Share on other sites More sharing options...
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