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mightyram50.net • View topic - Speedo gears interchangeability

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Speedo gears interchangeability

http://mightyram50.net/phpBB3/viewtopic.php?f=91&t=1290

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Speedo gears interchangeability

PostPosted: Wed Jun 16, 2010 5:46 pm
by TurboMax
I just swapped out the 3.909 ring gear & pinion with a 3.54 setup to improve my mileage. I'm currently running a 5-speed with stock 14" tires. Do I need to also swap out the speedo gear? If so, which speedo gear? I believe the stock 5-speed truck uses a 23 tooth speedo gear.

Re: Speedo gears interchangeability

PostPosted: Mon Oct 04, 2010 8:55 pm
by Rahtid
have you noticed any difference mileage

Re: Speedo gears interchangeability

PostPosted: Tue Oct 05, 2010 12:04 pm
by TurboMax
It went up about 2 mpg mostly street driving. I'm pretty sure that you can get a couple more mpg in hwy mileage. rpm's drop from 3200 to 2800 going 65-70 mph. Still need to find a 21 or 22 tooth speedogear though. I just have to remember the speedo is off 5mph.
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