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» Northern California Ford Owners     » Automotive   » Tech Talk   » how can i tell if my rear end is geared

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Author Topic: how can i tell if my rear end is geared
87fox302
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so i slaped a new rearend on my stang and got ride of my old on...i belive that the gears i have on now are 273 when mine came with 308s im not sure it by lowering the gears it messes with the speed tak?

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foo its a mustang it makes noises
Posts: 84 | From: sunnyvale | Registered: May 2007  |  :
LQ9SN95
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quote:
Originally posted by 87fox302:
im not sure it by lowering the gears it messes with the speed tak?
yezzzur

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Posts: 8031 | From: Fresno, Ca | Registered: Sep 2006  |  :
opie
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You can mark the driveline and wheel, then rotate how many time the driveline spins to 1 full turn of the wheel. Its not perfect but it will give you an idea.
Posts: 67 | From: dutch harbor | Registered: Jun 2007  |  :
Curt
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2.73 are actually higher gears

I know that tach isn't really all that accurate but you can use this formula to determine your gear ratio; (RPM x Tire Diameter)/ (MPH x 336) = Gear ratio

Say you were turning 2000 RPM @ 70MPH on 26in tires it would be (2000 x 26)/(70 x 336)------> (52000)/(21840)= 2.38

Oh yeah, that formula is for a 1 to 1 transmission ratio, so you will have to get RPM and speed while in 4th gear

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Posts: 866 | From: Monterey/Rocklin | Registered: Nov 2005  |  :


 
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