Are you looking for a speedo gear but prices are high?/Gear calculating info
hmmmm.....not sure about that chart, I ran through a few different gear calculators and went through the factory part numbers and the superseded part numbers and all and it all shows a 43 tooth gear is what was called for.
here is yearones chart (look at 27.9 tire x 4.5 gear range=43 gear)
http://www.yearone.com/yodnn/tech/T...Q/MoparSpeedoGearChart/tabid/415/Default.aspx
and another
http://home.earthlink.net/~mopared/speedo.htm
and even mymopar.com says its the correct gear.
http://www.mymopar.com/speedometer.htm
and in my yearone mopar parts catalog they have a speedometer gear chart and it says the same. this is all up to date info
here is a mathematical break down of it
first off , 275/25.4 =roughly 10.82
10.82x60%= 6.5
6.5x2=13
13+15=28" tire diameter
this tire would have 720 revs per mile
the formula for the speedo gear being 13(drive teeth)x4.56(rear gear ratio)x720(tire revs per mile)/1000= 42.6816 (43 tooth speedo gear)
here is an example of how to come to this conclusion that I worked up
727 Push Button = 8 Drive Teeth
727 Non Push Button = 13 Drive Teeth
904 Non Push Button = 13 Drive Teeth
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Drive Teeth x Rear End Gear Ratio x Tire Revolutions Per Mile/
1001 = Gear Teeth
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Tire Revolutions Per Mile quick guide
24” = 840.3 Tire Revs Per Mile
25” = 806.7 Tire Revs Per Mile
26” = 775.7 Tire Revs Per Mile
27” = 746.9 Tire Revs Per Mile
28” = 720.3 Tire Revs Per Mile
29” = 695.4 Tire Revs Per Mile
30” = 672.3 Tire Revs Per Mile