New 4.56:1 gears, now speedometer is way off. - Jeep Wrangler Forum

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Old 08-08-2014, 08:57 PM   #1
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New 4.56:1 gears, now speedometer is way off.

I just had 4.56:1 gears and a Detroit Truetrac locker installed. Now my speedometer reads 95-100 mph at interstate speeds. I'm running 33x12.50r/15 tires on a 93 YJ with 4.0 and AX15 5 speed.

Is there a remedy for this, or just learn to live with it? I have read a lot of posts about regearing, but I have not seen the speedometer issue mentioned in any of them.

Thanks for any help. Looking forward to insights and help.
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Old 08-08-2014, 09:09 PM   #2
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Wow! You can tell everybody you have the only YJ that will cruise at 100 mph! I have the same problem but since I'm running 35" tires my speedo is only reading 10% too high. A new speedo gear is about $35 and very easy to change, in your case you are also adding miles to your odometer that you aren't driving so changing it would be a good idea.

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Old 08-08-2014, 09:36 PM   #3
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Any idea what gear? What do I tell the guy at the auto parts store that I need? Can I just tell him I went from 3.07 to 4.56 and he can figure the gear?

By the way, thanks for the reply.
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Old 08-08-2014, 10:03 PM   #4
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Here is a chart and the gears. Looks like you're looking for 39 teeth gear
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Old 08-08-2014, 10:55 PM   #5
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Thanks for your help.
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