Looking into Gears (3.55 or 3.73 ) ?
07-09-2012, 04:05 PM
#1
Thread Starter
Join Date: May 2011
Location: SC
Posts: 25
Looking into Gears (3.55 or 3.73 ) ?
I was discussing gears options with a friend of mine that is very technically inclined to say the least about him, and has done many engine rebuilds and what not from the ground up.
And I said I wouldnt mind upgrading my gears, since I think the rearend bearing is kinda noisy and might need replaced and he said may aswell get a gear kit and do it all at once. And he asked what ratio would you go with knowing I drive 100miles a day and my 2004 GT ( AODE) is my Daily Driver so dont want to eat up in gas from doing this change anymore than normal but a little pep in my step wouldnt hurt any.
And I was like well 3.73 would make the most sense I think, 4.10 is gonna be way to steep with that high of a tooth and would kill me in gas! And he was like yup, your exactly right there... and he mentioned about a 3.55 and I was like really???
Sooooo didnt know what peoples thoughts on this would be, dont hear many people throw that number around much.
just thought I would get some insight...
And I said I wouldnt mind upgrading my gears, since I think the rearend bearing is kinda noisy and might need replaced and he said may aswell get a gear kit and do it all at once. And he asked what ratio would you go with knowing I drive 100miles a day and my 2004 GT ( AODE) is my Daily Driver so dont want to eat up in gas from doing this change anymore than normal but a little pep in my step wouldnt hurt any.
And I was like well 3.73 would make the most sense I think, 4.10 is gonna be way to steep with that high of a tooth and would kill me in gas! And he was like yup, your exactly right there... and he mentioned about a 3.55 and I was like really???
Sooooo didnt know what peoples thoughts on this would be, dont hear many people throw that number around much.
just thought I would get some insight...
Last edited by KrazyPony; 07-09-2012 at 04:07 PM.
07-09-2012, 04:27 PM
#2
5th Gear Member
Join Date: Jan 2009
Location: Mass
Posts: 2,662
Holy crap, a gear thread!
Serious note: First off this is in the 2005-2013 section, but I understand its a 4.6 so you just jumped straight into the tech section.
Go find a gear calculator online, and figure out what works best. Using your transmission ratios, and tire size, you can input the rear gear ratios to get a graph of mph vs rpm for each gear.
If you go with the 3.55's and they are too tall, go with a smaller tire.
Serious note: First off this is in the 2005-2013 section, but I understand its a 4.6 so you just jumped straight into the tech section.
Go find a gear calculator online, and figure out what works best. Using your transmission ratios, and tire size, you can input the rear gear ratios to get a graph of mph vs rpm for each gear.
If you go with the 3.55's and they are too tall, go with a smaller tire.
07-09-2012, 09:10 PM
#3
5th Gear Member
Join Date: Jul 2006
Location: New Orleans
Posts: 4,491
Truth is people blow the mileage difference way out of proportion when comparing 3.73s and 4.10s. It's really pretty negligible. Plus, mileage is a terrible reason to choose a gear ratio. You should consider what you plan on doing with the car and what gears will be most effective for that application.
07-10-2012, 11:03 AM
#8
Thread Starter
Join Date: May 2011
Location: SC
Posts: 25
Well thanks for the replies everyone, nice to see a forum still having activity...
Yeah I had done a search on Gear threads before posting and saw this was a 4.6 section and figured why not, not thinking this being a s197 area... who da thunk'd it!
Last time I heard someone actually running a 3.55 was in a 98 Cobra a few yrs back but not new edge cars, would it be worth any gain to go with a 3.55?
90% of my driving is all done on the highway more than city so gas mileage is a little important thats for sure. And for me to change wheel diameter is a little out of the question since I just dropped close to $400 on new rear 315/35/17 since mine were needing replaced badly and then I have 255/40's up front.
Its a AODE Transmission so I have that against me I know already, and with it having 155k on the ODO but smooth sailing so far.
Does anybody have a link for the calculator mentioned above? I'm thinking 3.73 might be the best route here...
Yeah I had done a search on Gear threads before posting and saw this was a 4.6 section and figured why not, not thinking this being a s197 area... who da thunk'd it!
Last time I heard someone actually running a 3.55 was in a 98 Cobra a few yrs back but not new edge cars, would it be worth any gain to go with a 3.55?
90% of my driving is all done on the highway more than city so gas mileage is a little important thats for sure. And for me to change wheel diameter is a little out of the question since I just dropped close to $400 on new rear 315/35/17 since mine were needing replaced badly and then I have 255/40's up front.
Its a AODE Transmission so I have that against me I know already, and with it having 155k on the ODO but smooth sailing so far.
Does anybody have a link for the calculator mentioned above? I'm thinking 3.73 might be the best route here...
07-10-2012, 09:51 PM
#10
3rd Gear Member
Join Date: Jul 2010
Location: Pennsylvania
Posts: 704