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Unread 02-23-2014, 12:15 AM   #1
YJ4LIFE
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1989 YJ Wrangler 
 
Join Date: Dec 2011
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Speedometer gear too small?

So I got a 28 tooth speedometer gear with the long shank but I think the diameter is too small. Am I suppose to change the matching gear in the transmission? It seems to be 1/2" too small or 1/4" per side.

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'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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Unread 02-23-2014, 12:21 AM   #2
stenyeart
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It is right. They vary in diameter based on the number of teeth. It has to be clocked correctly to make contact with the gear inside the transfer case.
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Unread 02-23-2014, 06:12 AM   #3
nagel
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I have the same issue, and although I haven't tackled the issue yet, I've been told you may have to swap over both gears (meaning the one on the inside as well). I swapped a NP242 in for an older NP231, and needed to use the 91 VSS from the NP231 (so I had both electronic and cable). The gears on the original speed sensor from the 242 are larger, and no amount of adjusting has gotten the smaller 91 VSS to mesh. Supposedly I have to open the 231 and take the corresponding gear and swap that over too..
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Unread 02-23-2014, 11:07 AM   #4
YJ4LIFE
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I did a few searches last night and finally understand what to do. The housing is eccentric like a cam lobe.THAT is what I have to clock to bring the smaller gear close to the stock worm gear. Thanks!!!!
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'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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Unread 02-23-2014, 01:28 PM   #5
YJ4LIFE
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1989 YJ Wrangler 
 
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Location: , Cali
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I got the new gear to work but now my speedometer needle wabbels a bit why is that? Does it need more tooth contact?
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'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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Unread 02-23-2014, 01:37 PM   #6
medic-11
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It might. There are 4 positions possible, the way the teeth fit into the grooves. It took me a few minutes to figure it out myself when I did mine last month.
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