3.55

DaLe five OH! · 05-30-2007, 10:07 PM

is that a good gear for me? i have a AOD but lost the O/D when i got the B&m shift kit...i pull 2grand at 80...i'm not looking for crazy stuff or anything just a little bit more seat of the pants feel...and i'm gettin sick of the 2.73's...who needs to save gas anyways?...

rwhite65 · 05-31-2007, 12:12 AM

Why did you lose OD?

Dark_5.0 · 05-31-2007, 01:44 AM

Most peple that go with 3.55's end up going to 3.73's or 4.10's anyways so you may as well start with 3.73's IMO.

I have 3.27 gears in my auto stang and even they are a big improvement over stock.

DaLe five OH! · 06-01-2007, 01:37 AM

i'm not looking to completely drag this car...its my DD and i'm going to keep it that way for as long as i can

...thats why i'm going with the 3.55's middle of the road IMO because the shift kit took it out i'm guessing

DaLe five OH! · 06-11-2007, 12:01 PM

sorry i pressed the post button to many times...

DaLe five OH! · 06-11-2007, 12:04 PM

is there any one on here that can tell me what kind of RPMs i'd be pulling with 3.55 or 3.73 at 55 with a AOD, and is there a fourmula that i can use to tell me what i might be pulling? i'm at 1,400 right now at 55

bailey_57 · 06-14-2007, 04:51 PM

i'd definitely go with the 3.73's, and how are you doing 55 at 1400 rpm in drive, does anyone else think that sounds a bit off. i think you still have overdrive functioning. set up your problem as a proportion. the gear ratio and the engine rpm are directly proportional (in other words as one number increases so does the other). Now given your scenario where you are turning 1400 rpm with 2.73's and you want to know what rpm you'll be turning with 3.73's, and your speed of 55 mph is the constant between the two events you would put 1400/2.73 = rpm/3.73. Your unknown is the engine rpm, so its a matter of cross multiply and divide. Multiply 1400 times 3.73 and divide by 2.73. i came up with 1912.82 rpms this will work for any gear ratio you plug in. I wish I could've used stacked fractions it would look alot nicer.

Hope this helped.

DaLe five OH! · 06-14-2007, 05:32 PM

most deffiently(sp), i'm gonna be doing some hwy driving so 3.55 seem perfect for me...thanks man

05-30-2007, 10:07 PM	#1
DaLe five OH! Registered Member Join Date: Nov 2006 Location: Naples FL Posts: 106	3.55 is that a good gear for me? i have a AOD but lost the O/D when i got the B&m shift kit...i pull 2grand at 80...i'm not looking for crazy stuff or anything just a little bit more seat of the pants feel...and i'm gettin sick of the 2.73's...who needs to save gas anyways?... __________________ ZEX

05-31-2007, 12:12 AM	#2
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: 3.55 Why did you lose OD? __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

05-31-2007, 01:44 AM	#3
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: 3.55 Most peple that go with 3.55's end up going to 3.73's or 4.10's anyways so you may as well start with 3.73's IMO. I have 3.27 gears in my auto stang and even they are a big improvement over stock. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

06-01-2007, 01:37 AM	#4
DaLe five OH! Registered Member Join Date: Nov 2006 Location: Naples FL Posts: 106	Re: 3.55 i'm not looking to completely drag this car...its my DD and i'm going to keep it that way for as long as i can ...thats why i'm going with the 3.55's middle of the road IMO because the shift kit took it out i'm guessing __________________ ZEX

06-11-2007, 12:01 PM	#5
DaLe five OH! Registered Member Join Date: Nov 2006 Location: Naples FL Posts: 106	Re: 3.55 sorry i pressed the post button to many times... __________________ ZEX

06-11-2007, 12:04 PM	#6
DaLe five OH! Registered Member Join Date: Nov 2006 Location: Naples FL Posts: 106	Re: 3.55 is there any one on here that can tell me what kind of RPMs i'd be pulling with 3.55 or 3.73 at 55 with a AOD, and is there a fourmula that i can use to tell me what i might be pulling? i'm at 1,400 right now at 55 __________________ ZEX

06-14-2007, 04:51 PM	#7
bailey_57 Registered Member Join Date: Mar 2000 Location: Berwick,Pa Posts: 127	Re: 3.55 i'd definitely go with the 3.73's, and how are you doing 55 at 1400 rpm in drive, does anyone else think that sounds a bit off. i think you still have overdrive functioning. set up your problem as a proportion. the gear ratio and the engine rpm are directly proportional (in other words as one number increases so does the other). Now given your scenario where you are turning 1400 rpm with 2.73's and you want to know what rpm you'll be turning with 3.73's, and your speed of 55 mph is the constant between the two events you would put 1400/2.73 = rpm/3.73. Your unknown is the engine rpm, so its a matter of cross multiply and divide. Multiply 1400 times 3.73 and divide by 2.73. i came up with 1912.82 rpms this will work for any gear ratio you plug in. I wish I could've used stacked fractions it would look alot nicer. Hope this helped. __________________ '89 GT hatch back performer rpm intake, performer rpm cylinder heads, fms e-303 cam, kirban adj fp regulator, holley 65mm tb, harland sharp 1.6 roller rockers, alum driveshaft, 3.73 gears (283 rwhp, 303 rwtq new numbers with new heads)

06-14-2007, 05:32 PM	#8
DaLe five OH! Registered Member Join Date: Nov 2006 Location: Naples FL Posts: 106	Re: 3.55 most deffiently(sp), i'm gonna be doing some hwy driving so 3.55 seem perfect for me...thanks man __________________ ZEX