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Unread 08-23-2007   #1 (permalink)
MADDMIKE is offline Rookie

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Default 1987 Mustang 4.10: Gears Or 3.73:

I have a 87 5.0 high output. It is mainly stock A few mods done. I want to change gears, but i still want to be able to drive it on the highway at 65-75 mph... I have a (AOD) TRANNY. What should i use?

Last edited by MADDMIKE; 08-23-2007 at 01:08 AM. Reason: miss spelling
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Unread 08-23-2007   #2 (permalink)
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Do you have a commute? Do you care about gas mileage? Is your exhaust very loud? If you drive alot of highway miles i would suggest the 3.73's, even if you dont if you're planning on upping the horsepower the 4.10's might be a bit short for you're liking, especialy for the highway. Either way, my vote goes for the 3.73's. Crusing on the highway with 4.10's = high RPM's = increased engine wear = bad all around.
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Unread 08-23-2007   #3 (permalink)
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3.73s are definately a better all around gear,especially if you want to
boost or juice later on.
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Unread 08-23-2007   #4 (permalink)
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Dude I know you are new here so I'll say this as politely as possible.... DO A SEARCH. This question has debated to DEATH on here and if you do a search, you will likely find a couple of dozen threads about it. Basically, if your running a 5 speed manual, everyone recommends 3.73's, if your automatic, 4.10's. Do the search function as it will answer all of your questions about gears and some questions you didn't even know to ask about.


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Unread 08-24-2007   #5 (permalink)
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I got 4.10s with the aod and heads cam and intake along with some other bolt ons they work well for me but here in western nebraska the speed limit is 65 on the highway no interstate for my daily commutes i run with a holeshot 2400stall converter about 2400rpm at 65-70 mph. The only thing that sucks is the speedo is about 10-12 to fast!
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Unread 08-25-2007   #6 (permalink)
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Thanks Guys I Will Go With The 4.10s
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Unread 08-25-2007   #7 (permalink)
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off topic but what's the stock gears in 87 gt. Is it 2.73's.

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Unread 08-28-2007   #8 (permalink)
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2.73 gears were the stock ratio, but there was an optional 3.08 ratio
that was availiable.
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Unread 08-28-2007   #9 (permalink)
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4:10's for a AOD...
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Unread 08-29-2007   #10 (permalink)
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I have 3.73 gears in mine and I would rather have went 4.10. There is plenty of gear left to step it up.
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Unread 08-30-2007   #11 (permalink)
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My $.02...............

I have 4.10's with a T5 on my '92 and they're the best. However, my car is slowly turning into a weekend car and away from being a daily driver. On the highway, the 4.10's are kind of rough.
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