Diff gears

macus1305 · April 21st, 2010, 09:15 AM

So i just bought a 99 gt with some slight mods, im new to mustangs(came from Pontiac GP land) but do turn wenches so this will be a nice project. anyway the diff gears in my gt are low end torque. and the rime are 17". the computer is set for stock diff gears and 16" rims( dont know if all gts came in 17" or not). the mph is 10 mph off( 30 is acctualy 20), is there a way to calculate the gearing accurately w/out pulling the diff cover? dont got cash for the oil that goes in it.

dcook_14 · April 21st, 2010, 09:24 AM

Jack the back of the car up and spin the tire one rotation while someone else is counting how many times the driveshaft goes around. If it goes around 3 1/4 times, you have 3.27s, 3 1/2 you have 3.55s, 3 3/4 you have 3.73s, or a little over 4 and you have 4.10s

dcook_14 · April 21st, 2010, 09:25 AM

Originally Posted by macus1305

the computer is set for stock diff gears and 16" rims( dont know if all gts came in 17" or not).

BTW computers are tuned for tire size, not rim size

macus1305 · April 21st, 2010, 09:26 AM

thanks boss ima do that!!

April 21st, 2010, 09:15 AM	#1
macus1305 Newbie Join Date: Apr 2010 Location: Mass. Posts: 16 iTrader: 0 reviews	Diff gears So i just bought a 99 gt with some slight mods, im new to mustangs(came from Pontiac GP land) but do turn wenches so this will be a nice project. anyway the diff gears in my gt are low end torque. and the rime are 17". the computer is set for stock diff gears and 16" rims( dont know if all gts came in 17" or not). the mph is 10 mph off( 30 is acctualy 20), is there a way to calculate the gearing accurately w/out pulling the diff cover? dont got cash for the oil that goes in it.

April 21st, 2010, 09:24 AM	#2
dcook_14 Banned 2004 Mustang GT 12.35@114.08 w/ 1.88 60' Join Date: Feb 2009 Location: Waterloo, IA Posts: 7,015 Blog Entries: 2 iTrader: 7 reviews	Jack the back of the car up and spin the tire one rotation while someone else is counting how many times the driveshaft goes around. If it goes around 3 1/4 times, you have 3.27s, 3 1/2 you have 3.55s, 3 3/4 you have 3.73s, or a little over 4 and you have 4.10s __________________ Do the Right Thing, Cook. ~Zip.

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April 21st, 2010, 09:26 AM	#4
macus1305 Newbie Join Date: Apr 2010 Location: Mass. Posts: 16 iTrader: 0 reviews	thanks boss ima do that!!

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