Montezuma Posted February 25, 2007 Share #1 Posted February 25, 2007 the numbers on the differental that indicates what variation it is. Link to comment https://www.classiczcars.com/topic/23414-where-do-you-find/ Share on other sites More sharing options...
Mr Camouflage Posted February 25, 2007 Share #2 Posted February 25, 2007 Casting numbers are on the top of the diff. If its in the car, you'll need a mirror. If you want to know the ratio, you'll have to open it up, as its stamped on the crown wheel. Link to comment https://www.classiczcars.com/topic/23414-where-do-you-find/#findComment-200498 Share on other sites More sharing options...
beandip Posted February 25, 2007 Share #3 Posted February 25, 2007 the numbers on the differential that indicates what variation it is.For one thing the R-200 is larger than the R-180 . The two studs on the rear of the diff are larger on the R-200 . The numbers are stamped on the ring gear but you would need to remove the rear cover . What are they out of ? If you know what Z the diffs. are from, then we can tell you what they are, and the gear ratio. Automatics have 3.54 to one and manuals 3.36 to 1 MOSTLY . Some 2 + 2s have the R-200 with 3.70s . Zs with 5 speed tyranny's have 3.90s . so you see it helps to know what the Z was that they were pulled from . Gary Link to comment https://www.classiczcars.com/topic/23414-where-do-you-find/#findComment-200502 Share on other sites More sharing options...
ktm Posted February 25, 2007 Share #4 Posted February 25, 2007 The stamps on the ring gear will be two numbers offset by a colon, such as 39:11 (3.545) or 37:11 (3.36). Link to comment https://www.classiczcars.com/topic/23414-where-do-you-find/#findComment-200509 Share on other sites More sharing options...
Yarb
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