speedo calibration?

[tdavis]

Ok, I've just put the black (21 tooth) speedo gear in. Now, I'm just wondering if the speedo is corect! I know I could try and find a mile marker - but I live in California, and those pesky things are disguised in the Bay area!

So, my simple question for those of you with 4.56 gears, 5 speed manual, and 33" tires.

When driving 65, what RPM's is your engine running when in 5th gear?

You answer is appreciated!



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Thomas Davis
93 Mazda Navajo/5.5" superlift, 33x12.5 BFG AT/KO
4.56 gears/lockright/auburn pro

 

[rpenner54]

Thats the correct gear. At least its as close as you will get. Thats the same combo I run right now. I have a GPS also which tells me how fast I am going. Usually they are both within 5mph of each other. I think at 65 I am running 2500-2700 rpm, I would have to double check though.



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Ryan Penner
1992 Explorer Sport Modified

 

[tdavis]

Ok, I just found out 5th gear is, and used a calculator to find rpm vs speed vs gear.

2500 RPM's w/4.56 and 33" tires is what you should be running at 65.

So the black tooth is dead on with my speedo, and the BFG AT/KO's.



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Thomas Davis
93 Mazda Navajo/5.5" superlift, 33x12.5 BFG AT/KO
4.56 gears/lockright/auburn pro