AZRick Posted March 6, 2014 Share Posted March 6, 2014 Anyone have a source for a 52068061-39 tooth speedo gear? Green-Long Shaft Morris has N/A for long shaft 38, 39 & 40 tooth :fs1: Currently have an old Garmin stuck to the dash, it's getting old. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 6, 2014 Share Posted March 6, 2014 http://www.ebay.com/itm/Dodge-Jeep-39-Tooth-Speedometer-Gear-Long-Shaft-/151235957549?pt=Motors_Car_Truck_Parts_Accessories&hash=item23365d932d&vxp=mtr Link to comment Share on other sites More sharing options...
az comanches Posted March 6, 2014 Share Posted March 6, 2014 Anyone know what your speedometer will increase with 235/75/15's. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 6, 2014 Share Posted March 6, 2014 Not w/o knowing your transmission and diff gear ratio. Link to comment Share on other sites More sharing options...
Megadan Posted March 6, 2014 Share Posted March 6, 2014 Anyone know what your speedometer will increase with 235/75/15's. 235/75-15 is a 29.1" tire. If you know what your gear ratios are, then use this chart to select the right tooth count for the gear. http://www.transmissioncenter.net/Speedometer_Gear_Chart.jpg Link to comment Share on other sites More sharing options...
gogmorgo Posted March 6, 2014 Share Posted March 6, 2014 It would depend more on your original tire size, although probably we can get that from your gear ratio/tranny combo. I personally didn't notice any appreciable difference in my speedometer's inaccuracy when I switched from the 225/75R15's that were on mine (as per the tire info sticker) to 235/75's, but then that's not much difference in diameter... about a half inch. Works out to about a 2% increase in circumference and therefore wheel speed (You'll be doing 61.2 when your speedo reads 60) but in all honesty that's within typical calibration error in a new car, so meh. I may be wrong on this, but I believe the smallest tire that was fitted to the Comanche was the 205/75/15. Going to a 235/75 from that size would be about a 10% increase in wheel speed, which starts to become significant. You'll be going 66 when your speedo says 60. However, these are based on nominal tire sizes. Actual tire dimensions will change depending on the construction of the tire, pressure, load, wear, etc., so YMMV. If you really want to know how inaccurate your speedometer will be, you'll pretty well need to change the tires and then find some better calibrated way to measure your speed, like a GPS or radar unit. Link to comment Share on other sites More sharing options...
AZRick Posted March 6, 2014 Author Share Posted March 6, 2014 http://www.ebay.com/itm/Dodge-Jeep-39-Tooth-Speedometer-Gear-Long-Shaft-/151235957549?pt=Motors_Car_Truck_Parts_Accessories&hash=item23365d932d&vxp=mtr you the man, it's mine now, estimated delivery Mar 11. Thank YOU! Link to comment Share on other sites More sharing options...
AZRick Posted March 6, 2014 Author Share Posted March 6, 2014 Anyone know what your speedometer will increase with 235/75/15's. 235/75-15 is a 29.1" tire. If you know what your gear ratios are, then use this chart to select the right tooth count for the gear. http://www.transmissioncenter.net/Speedometer_Gear_Chart.jpg another chart, http://gojeep.willyshotrod.com/HowtoSpeedoGears.htm with part numbers Link to comment Share on other sites More sharing options...
wvzj Posted March 7, 2014 Share Posted March 7, 2014 I just ordered a 39 tooth long shaft from Quadratec. They had them in stock Link to comment Share on other sites More sharing options...
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