Speedo gear for 5.13s?

I still drive my truck on teh road so would like to konw how fast I am going. I have 5.13s and 35s that measure out to 34s. Here is what I have found....

R&P / Tire 38" 37" 36" 35" 33" 32" 31" 30"
5.13 .. .. .. .. .. .. .. ..
4.88 36 37 38 39 41 43 44 46
4.56 34 35 36 37 39 40 42 43
4.11 31 32 33 34 36 37 38 40
3.73 27 28 28 29 31 32 33 34
numbers in bold are GPS-verified

That dont help me much. GOJEEPs site doesnt have them either. I have done three other calculators and got varying results. Either 40 or 41 tooth. ANyone know which one I need? Thanks for the help....
josh

The best thing is to use a GPS to tell you how far out you are now. Then you can use the formula on my site to work out which is the correct one. If you do not have a GPS you can measure the time it takes to go 10 miles for instance. Sit at 60 mph indicated and see how much time it takes to go 10 miles. Should take 10 minutes so compare it to what you have and then you know what percentage you are out. Then get the same percentage different speedo gear. ( or 5 miles in 5 minutes at 60 mph )
I be happy to help out if you give me the data to work with.

41 tooth speedo gear will be close as you will get.