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I have a 1991 LX 5.0 w/AOD transmission and I installed a 4.10 rear end, so I purchased this gear along with a new speedo cable (I had the jumpy speedo problem) and while it (mostly) cured the jumping problem, the speedo is still off by 10mph. Why? Also anyone know why the speedo would still be a little jumpy? It's only jumping 2-4mph it's still happy.
Asked by Timothy S. from Apple Valley | Comment 0 0
Because you have a 91 with an AOD, the internal drive gear in the transmission is an 8 tooth unit. Even with a 23 tooth driven gear, you will be 10mph off with 4.10 gears. Without a custom reduction box form someone like Abbott, this will be as close as you'll get.
Jumpy speedometers are typically an old/worn cable, a new cable that was not properly lubricated, or a defective speedometer itself.
Answered by Jonathan M. from Hewitt | 1 Comments 1 0
When swapping to a 140mph speedometer, the gauge itself is already calibrated appropriately, and the gear at the transmission does not need to be changed unless you have changed the rear end gear ratio. Your existing speedometer cable will also work with the 140mph gauge.
Answered by Karson S. from Hewitt | Comment 0 0
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