Ok, cant seem to get much info in my area of the world so i am going to pick peoples brains here, i am running a T350 box, 3.7:1 diff gears with a 15" rim and a 65 series tyre of which is 21"s all up, what would be thebest driven gear to use to get my speedo working as close as i can.
Does anyone have a chart on all driven gears for a T350, basically need to know what colour gear to suit what final gear ratio.

Thanks in advance, hope you can help.

 

your top of the line trasmission shops can figure that out for you(maybe a shadetree here and there).i have a few different gears that i start with.get on the freeway and pace yourself from mile marker to mile marker and look at the odometer.if the odometer is slow you need to speed up the gear by going with a gear with more teeth.if it is to fast you go down a few teeth on the gear.it's experimental but you can get there.

 

ok will do, whenthe speedo reads100KMH (60MPH)i am actually doing 80KPH (49.5MPH) i tested this way with another vehicle, so if i go down in teeth it should make it better

 

correct.do 60 from mile post to mile post,if your slow use a smaller gear,if your fast use a bigger gear.

 

go to www.tciauto.com they have all the gears you need and a formula all you have to do is call them with the tooth count of your gear, tire size, and gear ratio and they will tell you just what you need and it will be exact. i just did that last week found out the gears i needed and picked them up from my local chevy dealer

 

here is the exact location of your gears http://www.tciauto.com/Products/Comp...eter_gears.asp