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Need advice on gear ratio selection?

I was hoping Someone could help Me figure out two things?

Is 15th/16th gear the 1 to 1 in an 18 speed transmission?

And what rear end ratio do I need to get My truck to turn 1450 RPM at 60 MPH in 16th gear?

I run 445/50 22.5's.

Thanks

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5 Answers

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18 Speed is a double over and the 16th gear is direct.

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Based on the calculator I found, to be at 1450 at 60 mph you'd want 2.87s

2.79s are the gears to run for direct from what I gathered in the article from Bruce I read, I can't find it right now. If you ran 2.79s and wanted to stay at 60 mph you'd be running about 1406 rpm.

Here's the website I found that gives all sorts of calculators

http://www.currieenterprises.com/cestore...?

And this one gave me your tire diameter

http://researchmaniacs.com/Calculate/Tir...

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I am running an 18 double over in 16th with 2.64 rears. 1400 rpm, on 445/50 22.5 low pro rubber has me sitting on 61/62 mph. To get 1450 at 60 mph in 16th would indeed take 2.79 ratio. Another option is 3.25 rears and run in 17th, which would be the identical 60 mph road speed at 1450 rpm. Sure it is single over, but it is still far less parasitic than getting into double over, and if one has the need for serious low end grunt, it would give you the best of both worlds. That is the beauty of going this route, there are so many options one could use and fine tune it to their particular application.

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Get your vin and call the dealer to find out if it is a single of double overdrive trans. That will tell u where direct is. With out that info we are all just guesing.

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I have 2.85 and in 16th gear I'm right about where your looking for.

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straightlinecarrier will be eternally grateful.
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