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Theo 08-03-2009, 01:54 AM For the 3.73:1 Diff ratio do I need the following adapter for my Speedometer:??? PN 25513052 45 TOOTH LT Blue Gear I got this sometime ago but just want to confirm again?? Thanks Theo toobroketoretire 08-03-2009, 03:19 AM I suggest you Google "speedometer gears". The website will walk you through the process of calculating which gears you need based on the rolling circumference of your rear tires. To accurately measure the rolling circumference of your tires, do this: 1. Put a dab of grease on the tread of your rear tire and roll your car far enough to leave 2 grease spots on your driveway. 2. Measure the distance between the grease spots. That's your tire's true circumference. 3. If you want to know your tire's rpm at 60 mph, divide 63,360 (number of inches in a mile) by the tire's circumference. C4boom 08-04-2009, 07:03 AM I suggest you Google "speedometer gears". The website will walk you through the process of calculating which gears you need based on the rolling circumference of your rear tires. To accurately measure the rolling circumference of your tires, do this: 1. Put a dab of grease on the tread of your rear tire and roll your car far enough to leave 2 grease spots on your driveway. 2. Measure the distance between the grease spots. That's your tire's true circumference. 3. If you want to know your tire's rpm at 60 mph, divide 63,360 (number of inches in a mile) by the tire's circumference. You know some crazy stuff! lol:thumbsup3: vetteoz 08-04-2009, 03:01 PM I suggest you Google "speedometer gears". The website will walk you through the process of calculating which gears you need based on the rolling circumference of your rear tires. . Theo You need both the 45 tooth driven gear AND the 15 tooth drive gear to correct for 3.73. You will need to check what color gear is on the output shaft. Forget what your original ratio was but most likely you have stock 17 tooth drive gear. Springboks got lucky again :eek2: Theo 08-05-2009, 12:53 AM Theo You need both the 45 tooth driven gear AND the 15 tooth drive gear to correct for 3.73. You will need to check what color gear is on the output shaft. Forget what your original ratio was but most likely you have stock 17 tooth drive gear. Springboks got lucky again :eek2: Lets see when the Springboks play that side...... Thanks for the info Rod. How's your conversion.....ok? are you satisfied? vetteoz 08-05-2009, 04:54 AM How's your conversion... Still waiting to get diff head back from shop. D44 install kit was missing the crush sleeve which I had to source out of the USA. toobroketoretire 08-05-2009, 10:56 AM Still waiting to get diff head back from shop. D44 install kit was missing the crush sleeve which I had to source out of the USA. Crush sleeve? My Dana Spicer 44 ICA in my '82 uses a shim pack. About .100 worth of small diameter shims. Then the pinion nut is torqued to about 150 ft/lbs. | |