Ok I was told there are 4:11 gears in my 8.8 and I feel like it's too much gear. Especially when cruising on the freeway, somewhere around 3000 rpm at 60 mph. Going down to a 3:73 or 3:55 what would my rpm be at 60 mph
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Thread: Gearing question
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11-04-2009, 02:24 PM #186' Stang
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Gearing question
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11-04-2009, 02:27 PM #2IrishGuest
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Last edited by Irish; 12-31-2009 at 12:23 PM.
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11-04-2009, 02:41 PM #3The Yellow Tie Fighter
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It is simple linear math based on the known rpm/gear you have now.
3.73s:
3.73/4.11 * 3000 = ~2722 rpm at 60
3.55s:
3.55/4.11 * 3000 = ~2591 rpm at 60
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11-04-2009, 02:52 PM #486' Stang
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Awesome thanks guys probably going with 3:55's in the spring. I want to take this car on longer drives when it gets nice out again.
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11-04-2009, 03:21 PM #5IrishGuest
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Last edited by Irish; 12-31-2009 at 12:23 PM.
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11-04-2009, 09:48 PM #6Ol' School
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I love my 3.73's. Difference between 3.73 and 3.55s is only 200 rpms.
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11-04-2009, 10:18 PM #7
hmmm and with my aod I want 4.10s but maybe 3.73s would be ok
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11-04-2009, 10:35 PM #82slow4u
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Red 1982 Trans Am MSE Hooker 1 5/8, 3 inches back, 3:73s ---- Red 1990 Formula with ZZ4 motor, Hooker 2055s, American Thunder catback ---- Black 1991 GTA with 3 inch Flowmaster Catback system ---- Black 2002 WS6 Bone Stock
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11-05-2009, 09:23 AM #9The Yellow Tie Fighter
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That calculator is a little suspect. There is no input for ratio of the last gear in the trans... so it must be assuming something (likely 1:1 ratio). That is probably okay for a race car, but with any trans with overdrive it's not going to be right.
Originally Posted by TransAm12sec
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11-05-2009, 09:51 AM #102slow4u
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You use the gear that is closest to a 1:1 ratio, similar to a dyno run.
Either way, it's based off this equation.
(MPH x Transmission Gear x Rear Gear x 336) / Tire Diameter(inches) = RPMLast edited by TransAm12sec; 11-05-2009 at 09:55 AM.
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11-05-2009, 07:01 PM #11SET ON SAFE!
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Those look like a 28 tire on your car in the sig. I would do a 3.73 theres a reason that they sell so many, plus you would have stoplight capabilities and hwy miles.
I had a 347 E cammed 5 speed car with 4.10 and a 26'' and I got 22 MPG's. Looking back 3.73's is what everybody told me and I should of did.
GL though whatever ya choose.If a hammer,crescent wrench,duct tape, or JB Weld can't fix it........Its gotta be a electrical problem
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11-05-2009, 10:01 PM #12Praise the Lord.
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tire size and trans ratio make a huge difference also.for instance on my 18's with the trans i have and 4.10's it is at 3000rpms at 84 mph
special thanks to: Marv @ C&M performance 262-993-6605
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11-07-2009, 05:30 PM #13Ol' School
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What trans do you have? my 95 with a 28" tall tire and 3.73's were perfact for the freeway, but I had a T5 wich was a .68 5th gear. But since you have a 4 eyed, you could have any trans in that year range which would be either a .68 .63 or .80 ratio.... I dont know what the autos had for a high gear, but im guessing you have a t5. I cant remember what my rpm was, but I know i averaged 20 MPG on the freeway and it wasn't winding up high at all.
70 cutlass 442- dads car
95 stang- Stock long block 195,XXX miles
03 XC600 - bone stock (still faster then smokin ram)
03 Polaris predator- 4.250 bore
(assembly required)
84- 4 eyed
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11-08-2009, 11:55 AM #1486' Stang
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yeah it's a 28" tire with a C4 trans
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11-08-2009, 12:17 PM #15Erect Member.
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Thats your problem, you have no overdrive. Better get used to it, swapping to a 3.55 with that tall tire is gonna make the car feel like a turd.
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11-08-2009, 05:52 PM #16Ol' School
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QFT, What stall do you have? that will make a big differance, but if you goto a 355 I will tell you right now you will be disapointed. Originally Posted by badass88gt
70 cutlass 442- dads car
95 stang- Stock long block 195,XXX miles
03 XC600 - bone stock (still faster then smokin ram)
03 Polaris predator- 4.250 bore (assembly required)
84- 4 eyed
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11-08-2009, 06:20 PM #17Wash, Wax, Repeat.
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Here is one I downloaded and then modified for my car. I have a 5-spd 2006 with 3.73 gears. I have 27" tires (255/45/R18). If it works for you with little modification great. If not, PM me and I will work out the details and send it to you.
Last edited by 1320PNY; 09-10-2010 at 04:05 PM.
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11-08-2009, 07:26 PM #1886' Stang
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I have a 9.5" converter 3000 stall
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11-08-2009, 09:28 PM #19Erect Member.
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Like I said, it will be a pooch. You have to decide whats important to you, going quick from a stop or nice highway cruising. You are not going to get both with your current setup.
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11-09-2009, 01:59 AM #20Ol' School
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yeah, horrible combo if you want to be fast on 3.55s.... you will hate it... only thing 355s are good for are turbo cars and fuel economy. Originally Posted by ThatWhiteCivic
70 cutlass 442- dads car
95 stang- Stock long block 195,XXX miles
03 XC600 - bone stock (still faster then smokin ram)
03 Polaris predator- 4.250 bore (assembly required)
84- 4 eyed
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