Finding rear gear ratio?

LSX Freak · May 8th, 2011, 03:35 PM

I've used a couple different gear ratio calculators, trying to find my rear gear. With the T-5 and 275/40/17's I turn 2400 RPM at 70 MPH.

Gear Calculator

I put 26", 4.11 gear ratio, 2400 RPM at 70 MPH with the 3rd gen Camaro T-5 (to my knowledge, same transmission) into this calculator. That's about accurate of a calculator I'm going to find I think. Am I correct on this? One big rant I have about buying a built car is having to figure out what all has been done. The PO had it all written down w/receipts and everything but lost it in a move. Still have no idea what pistons, compression, cam, or any of that happy stuff is and really have no idea of finding out. Doesn't take away from me enjoying what I've already got though

fogged306 · May 8th, 2011, 03:49 PM

jack the back end of the car up and spin the tire. However many rotations the driveshaft turns for one tire revolution is your gear ratio. If it spins just over 4 times it's 4.10's if it's 3-3/4 its 3.73's ect..

LSX Freak · May 8th, 2011, 03:55 PM

Originally Posted by fogged306

jack the back end of the car up and spin the tire. However many rotations the driveshaft turns for one tire revolution is your gear ratio. If it spins just over 4 times it's 4.10's if it's 3-3/4 its 3.73's ect..

Car is about 550 miles from me or I would....

fogged306 · May 8th, 2011, 03:57 PM

I can see how this may make that method a little tough.

LSX Freak · May 8th, 2011, 03:59 PM

Originally Posted by fogged306

I can see how this may make that method a little tough.

Last time I used my mind powers to travel, they didn't work. So I'll just have to bug someone on here for an answer.

93hatch · May 8th, 2011, 04:09 PM

4.11s

LSX Freak · May 8th, 2011, 06:20 PM

Originally Posted by 93hatch

4.11s

Shanks. One step I can skip this winter.

93hatch · May 8th, 2011, 06:31 PM

was making fun of you lulz ford shits 4.10s

calculator I used seemed like 4.10s or 4.30s

LSX Freak · May 8th, 2011, 06:56 PM

Originally Posted by 93hatch

was making fun of you lulz ford shits 4.10s

calculator I used seemed like 4.10s or 4.30s

I just mis-judged your post. I only take 1/10 of your posts serious. Just missed by a few I guess.

May 8th, 2011, 03:35 PM	#1
LSX Freak Enthusiast Canary yellow 1990 GT Praying for 11's after winter mods Join Date: Apr 2011 Location: Moberly, Missouri Posts: 539 iTrader: 0 reviews	Finding rear gear ratio? I've used a couple different gear ratio calculators, trying to find my rear gear. With the T-5 and 275/40/17's I turn 2400 RPM at 70 MPH. Gear Calculator I put 26", 4.11 gear ratio, 2400 RPM at 70 MPH with the 3rd gen Camaro T-5 (to my knowledge, same transmission) into this calculator. That's about accurate of a calculator I'm going to find I think. Am I correct on this? One big rant I have about buying a built car is having to figure out what all has been done. The PO had it all written down w/receipts and everything but lost it in a move. Still have no idea what pistons, compression, cam, or any of that happy stuff is and really have no idea of finding out. Doesn't take away from me enjoying what I've already got though __________________ -Edelbrock Performer Intake/Heads -TFS2 Cam -Tremec 3550 -All them other bolt on performance thingys

May 8th, 2011, 04:09 PM	#6
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	4.11s __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

May 8th, 2011, 06:31 PM	#8
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	was making fun of you lulz ford shits 4.10s calculator I used seemed like 4.10s or 4.30s __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

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May 8th, 2011, 03:49 PM	#2
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	jack the back end of the car up and spin the tire. However many rotations the driveshaft turns for one tire revolution is your gear ratio. If it spins just over 4 times it's 4.10's if it's 3-3/4 its 3.73's ect..

May 8th, 2011, 03:57 PM	#4
fogged306 MM Fanatic 89 GT Join Date: Apr 2007 Location: NY Posts: 4,875 iTrader: 2 reviews	I can see how this may make that method a little tough.

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