Gears upgrade, should i go with 4.10s?

May 16th, 2007, 06:12 PM	#1
PaperCross Regular 2007 Mustang V6 Join Date: Sep 2006 Location: Illinois Posts: 250	Gears upgrade, should i go with 4.10s? Hi All, I just ordered my dual exhaust conversion kit and the GT rear bumpers take off...woohoo ....now i am gonna be upgrading gears and i was wondering if i should go with 3.73s or 4.10s. I read the article on MM about the debate between the two but i am still not sure. I am planning to S/C in future (way in the future) and i guess 4.10s is thye way to go. But do you think the 7.5" rear end is strong enough for 4.10s right now without the S/C? __________________

May 16th, 2007, 09:46 PM	#2
MaverickMLFD371 Hardcore Enthusiast 2005 12.3 @ 115 Join Date: Dec 2005 Location: Southampton, NJ Posts: 1,305	the best rule of thumb, since your going S/C. Manual = 3.73 Auto = 4.10

May 17th, 2007, 12:41 AM	#3
Fish Regular 2005 Mustang GT Join Date: Apr 2007 Location: MA Posts: 227	How come everyone puts in either 3.73 or 4.10? Does anyone put 3.11 like they used to in the fox bodies? are those to low for the HP of today's car? Just was curious.

May 17th, 2007, 01:20 PM

PaperCross

Regular

2007 Mustang V6

Join Date: Sep 2006

Location: Illinois

Posts: 250

Originally Posted by MaverickMLFD371

the best rule of thumb, since your going S/C.

Manual = 3.73

Auto = 4.10

Thanks! Just curious though, why would it be different for manual and auto? and would it hurt the 7.5" rear end in the long run?

__________________

May 17th, 2007, 01:26 PM

PaperCross

Regular

2007 Mustang V6

Join Date: Sep 2006

Location: Illinois

Posts: 250

Originally Posted by Fish

How come everyone puts in either 3.73 or 4.10? Does anyone put 3.11 like they used to in the fox bodies? are those to low for the HP of today's car?

Just was curious.

I think the newer modular engines get into the torque powerband at higher RPMs, hence the steeper gears. pushrod engines get into it at much lower rpms.

__________________

May 17th, 2007, 01:34 PM

HMUSN

Doc

91 Sonic Blue Goodness

19.83 @ 12mph

Join Date: Nov 2006

Location: NJ

Posts: 27,311

Originally Posted by PaperCross

Thanks! Just curious though, why would it be different for manual and auto? and would it hurt the 7.5" rear end in the long run?

the 7.5 rear end sucks.

the reason for your question is simple.

you lose more power if your an auto and the gears make up for it and you can't really control your shift points as well as a 5spd can.

May 17th, 2007, 01:47 PM

PaperCross

Regular

2007 Mustang V6

Join Date: Sep 2006

Location: Illinois

Posts: 250

Originally Posted by HMUSN

the 7.5 rear end sucks.

the reason for your question is simple.

you lose more power if your an auto and the gears make up for it and you can't really control your shift points as well as a 5spd can.

Yea 7.5" sucks but i guess i have to live with it for now, but i hope it wont break with the new gears.

I get the part about the difference between auto and stick. I guess the best i can do for the shift points would be to get a really good tune....

__________________

May 17th, 2007, 01:49 PM	#8
HMUSN Doc 91 Sonic Blue Goodness 19.83 @ 12mph Join Date: Nov 2006 Location: NJ Posts: 27,311	gears won't break your rear end man. the amount of TQ you put to it will. just don't run on slicks and you'll be fine.

May 17th, 2007, 01:57 PM	#9
PaperCross Regular 2007 Mustang V6 Join Date: Sep 2006 Location: Illinois Posts: 250	Cool...thanks man..just ordered the FRPP gears... __________________

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