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Old 03-21-2012, 09:22 PM   #1
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Gears

3.73s or 4.10s on my 2008 Pony Package automatic v6? I've got 60k miles on it
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Old 03-21-2012, 09:23 PM   #2
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4.10s!
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Old 03-21-2012, 09:47 PM   #3
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4.10s!
Why?
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Old 03-21-2012, 10:05 PM   #4
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Why?
Rule of thumb is usually 3.73 for 5speeds, and 4.10 for autos. But some people go with 4.10 5 speed or 4.30 for an auto.
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Old 03-21-2012, 10:08 PM   #5
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I thought the smaller gear would be safer for the auto
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Old 03-21-2012, 10:09 PM   #6
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Re: Gears

I would say 3.73s... supposedly 4.10s are good if you have an auto, but in a 5 spd 1st gear will be pointless in daily driving with 4.10s... so I'd say the situation may be similar in the auto...

4.10s if the car is not your DD, 3.73s if you still want decent fuel economy... It's all personal opinion in the end

reguardless, upgrading to either is gonna feel a hell of a lot better than the stock setup. Replace the stock open differential with a Tlock (posi) while you're in there so you don't look like a fool doing a 1 wheel peel... and the tlock will help get the power down a lot better.
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Old 03-21-2012, 10:15 PM   #7
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Yeah I wana replace the whole drivetrain basically...get an aluminum driveshaft, 8.8" rear end, ford racing limited slip, and either the 3.73s or the 4.10s
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Old 03-21-2012, 10:18 PM   #8
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Re: Gears

if you pull a GT rear end and swap that, the FRPP LSD won't be necessary, because the 8.8 rear ends already have positive traction.

And the aluminum driveshaft is just throwing away money... maybe give you 1 hp added to the wheels... not worth $400 unless your current driveshaft is messed up and you're getting a lot of vibration at highway speeds...
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Old 03-21-2012, 11:39 PM   #9
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Re: Gears

Quote:
Originally Posted by bmabbott View Post
if you pull a GT rear end and swap that, the FRPP LSD won't be necessary, because the 8.8 rear ends already have positive traction.

And the aluminum driveshaft is just throwing away money... maybe give you 1 hp added to the wheels... not worth $400 unless your current driveshaft is messed up and you're getting a lot of vibration at highway speeds...
Except if you take out your speed limiter and try to push your car to higher speeds then it is likely that when you get to 120 or up your driveshaft will fail, just like that one video that went around about the guy taking out his limiter and when he reached like 120 his driveshaft just broke...
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Old 03-22-2012, 02:52 PM   #10
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Yeah I want to replace it for that reason cause I'm doing alot of power mods
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Old 03-22-2012, 03:20 PM   #11
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Re: Gears

I'm running 3.73's in my 06 auto
the 4.0 doesn't have the R's for 4.10's
Sorry it just doesn't have the guts for it , my 4.0 is screamin on the highway now , I'd hate to put 4.10's in it ..........
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Old 03-22-2012, 03:29 PM   #12
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Quote:
Originally Posted by stampde
I'm running 3.73's in my 06 auto
the 4.0 doesn't have the R's for 4.10's
Sorry it just doesn't have the guts for it , my 4.0 is screamin on the highway now , I'd hate to put 4.10's in it ..........
Yeah but I'm planning re-doing the driveshaft and the whole rear end...I hate seeing a 40hp drop from the engine to the wheels!
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Old 03-22-2012, 03:33 PM   #13
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Re: Gears

nice
i put a traction lock in mine when we rebuilt it ,hopefully it holds up , if not i'll buy an 8.8 complete next time ,its only my DD but It has to hold up
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Old 03-22-2012, 03:35 PM   #14
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Quote:
Originally Posted by stampde
nice
i put a traction lock in mine when we rebuilt it ,hopefully it holds up , if not i'll buy an 8.8 complete next time ,its only my DD but It has to hold up
Same here all my mods have to be compatible and safe cause my stang is my only car too
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