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| Choosing a Speedo Gear (for upgraded gears) (How to get a speedo gear that will correct calibrate your speedometer after you've upgraded your rearend gears.) |
| Step 1: Choose a speedo gear |
| Step 2: Buying a Speedo Gear |
Choose a speedo gear |
| If you've recently upgraded your rearend gears and you now have a speedo which is no longer reading accurately, then you need to get the correct speedo gear to properly calibrate your speedometer. Different years/tranny/rearend gears change what speedo gear you're going to need. The speedo gear is at the end of the speedo cable at the tranny. (I'll try to write up the install instructions soon) Below is the various years/tranny/rearend gear combos and the related speedo teeth# gear you'll need.  [ remotely linked image: click here ] Speedo gear...some good info (researched from stangnet.com) -------------------------------------------------------------------------------- Manual Transmissions with 6 Tooth Drive Gear Not found in OEM applications Item Number Description N/A 3.08 Gear Ratio / Not possible C0DZ-17271-A 3.27 Gear Ratio / Maroon 16 Speedo Gear C3DZ-17271-C 3.55 Gear Ratio / White 17 Speedo Gear C0DD-17271-B 3.73 Gear Ratio / Yellow 18 Speedo Gear C0DZ-17271-B 3.90 Gear Ratio / Pink 19 Speedo Gear C1DZ-17271-A 4.10 Gear Ratio / Black 20 Speedo Gear C4OZ-17271-A 4.30 Gear Ratio / Red 21 Speedo Gear Manual Transmissions with 7 Tooth Drive Gear 1983-1989 T-5 OEM Pre 1993 T-5 Aftermarket 1996-1998 Cobra T-45 OEM All Tremec Transmissions Item Number Description C0DZ-17271-A 2.73 Gear Ratio / Maroon 16 Speedo Gear C0DD-17271-B 3.08 Gear Ratio / Yellow 18 Speedo Gear C0DZ-17271-B 3.27 Gear Ratio / Pink 19 Speedo Gear C1DZ-17271-A 3.55 Gear Ratio / Black 20 Speedo Gear C4OZ-17271-A 3.73 Gear Ratio / Red 21 Speedo Gear Jeep Part #j3167393 4.10 Gear Ratio / White 23 Speedo Gear Manual Transmissions with 8 Tooth Drive Gear 1990-1995 T-5 OEM 1996-1998 T-45 OEM Except Cobra Item Number Description C0DD-17271-B 2.73 Gear Ratio / Yellow 18 Speedo Gear C1DZ-17271-A 3.08 Gear Ratio / Black 20 Speedo Gear C4OZ-17271-A 3.27 Gear Ratio / Red 21 Speedo Gear Jeep Part #j3167393 3.55 Gear Ratio / White 23 Speedo Gear Jeep Part #j3167393 3.73 Gear Ratio / White 23 Speedo Gear (Not 100% accurate. This combination will offer the best accuracy without changing the drive gear. Change drive gear to a 6 tooth for complete accuracy. See 6 tooth table.) Jeep Part #j3167393 4.10 Gear Ratio / White 23 Speedo Gear (Not 100% accurate. This combination will offer the best accuracy without changing the drive gear. Change drive gear to a 6 tooth for complete accuracy. See 6 tooth table.) Automatic Transmissions with 7 Tooth Drive Gear 1983-1989 Automatic Transmissions Item Number Description D0AZ-17271-A 2.73 Gear Ratio / Blue 16 Speedo Gear C7AZ-17271-B 3.08 Gear Ratio / Gray 18 Speedo Gear C7VY-17271-A 3.27 Gear Ratio / Tan 19 Speedo Gear C8SZ-17271-B 3.55 Gear Ratio / Orange 20 Speedo Gear D0OZ-17271-B 3.73 Gear Ratio / Purple 21 Speedo Gear Jeep Part #j3167393 4.10 Gear Ratio / White 23 Speedo Gear Automatic Transmissions with 8 Tooth Drive Gear 1990-1998 Automatic Transmissions Item Number Description C7AZ-17271-B 2.73 Gear Ratio / Gray 18 Speedo Gear C8SZ-17271-B 3.08 Gear Ratio / Orange 20 Speedo Gear D0OZ-17271-B 3.27 Gear Ratio / Purple 21 Speedo Gear Jeep Part #j3167393 3.55 Gear Ratio / White 23 Speedo Gear Jeep Part #j3167393 3.73 Gear Ratio / White 23 Speedo Gear (Not 100% accurate.) Jeep Part #j3167393 4.10 Gear Ratio / White 23 Speedo Gear (Not 100% accurate.) Now if you really want to change the internal drive gear of your manual tranny you can match it according to the table below. Be aware that the 6 tooth will offer the most combos for numerically higher gear ratios and offer the greatest degree of accuracy. The 6 tooth gear selection table for a manual tranny is the first in the page. Item Number Description E3ZZ-17285-B 6 Tooth Internal Drive Gear / Black E3ZZ-17285-A 7 Tooth Internal Drive Gear / Yellow F0ZZ-17285-A 8 Tooth Internal Drive Gear / Green |
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