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Old 04-29-2010, 02:29 PM   #1
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gears

my 4.10 gears are about to be installed and i was wondering if anyone else with a 2005 or newer auto gt have 4.10 gears and what your honest opinion on them is. thank you
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Old 04-29-2010, 03:47 PM   #2
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Re: gears

Well mine is not a auto but I have the FRPP 4.10's and they are great.They give you a real seat of the pants feel.The only way I would go back to the 3.55s or 3.73s is if I were to run a twin screw.
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Old 04-29-2010, 07:35 PM   #3
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Re: gears

thanks. a few of my buddies have been telling me that its going to kill my gas mileage and that there too big for my car
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Old 04-29-2010, 07:57 PM   #4
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Re: gears

They definitely aren't too big for your car. While I don't have an 05+ GT with 4.10's, I will say that after hearing others, they are definitely worth it and you'll love the results.

You'll probably see a loss of 1 maybe 2 mpgs on the highway, and possibly a slight gain in the city. A good enough trade off imo...

Don't forget if you have a tuner you can adjust after the gears (well you have to) and that will help the car with mpg loss.
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Old 04-29-2010, 08:16 PM   #5
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Re: gears

sweet that isn't bad at all. is there anything you would think i should get put on along with the gears? i already have a tuner cai lt headers
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Old 04-29-2010, 08:31 PM   #6
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Re: gears

Well depending on your mileage you could get a rebuild kit for your tlok and get a rebuild kit for the rearend. Do this (if necessary), and you'll have a fresh, damn near new rearend.

Rear End Installation Kit (8.8in) at AmericanMuscle.com - Free Shipping!

Ford Racing 8.8" Traction-LOK Rebuild Kit w/ Carbon Discs at AmericanMuscle.com - Free Shipping!
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Old 04-30-2010, 08:37 AM   #7
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Re: gears

some are known to whine after install, just FYI... make SURE you have something in writing from your installer that states NO gear whine is acceptable that you can hear. If they are new ford racing gears they might be made by Motive which are known to whine more than the old ford racing gears~ I think they have an M stamped on them if motive but I am not sure if thats what it means.
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Old 04-30-2010, 12:03 PM   #8
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Re: gears

The next thing you will need to do is enjoy them! Have fun and let us know how they turn out.
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Old 04-30-2010, 05:22 PM   #9
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Re: gears

lol alright will do im excited for them. im probably gonna have to invest in some new rubber after the first couple of days.
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Old 04-30-2010, 05:29 PM   #10
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Re: gears

Just remember to break the gears in...probably 500 miles of easy driving, no hard launches, no burnouts (as tempting as it may be) and no extensive runs above 65 or 70.

This will allow the gears to settle and mesh properly in your rearend. As said, the motives might whine a little bit (even if installed properly), but not too much. Definitely get a written statement by whoever installs them saying what SpectorV said. Also if it's a private shop, ask the shop if they set pinion depth and backlash, and use shims if necessary...if they look dazed, don't go there to have it done. Gears are one of those things you want done right the first time.
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Old 04-30-2010, 07:32 PM   #11
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Re: gears

yeah absolutely. You definitely will not be going through rubber your first days. Those gears need heat cycling before they are ready to romp on.
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Old 05-01-2010, 02:23 PM   #12
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Re: gears

I would say to take it easy on them also but myself as well as others I know have not used the break in method and have been just fine. So do some research on some other forums as well.
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Old 05-02-2010, 10:13 AM   #13
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Re: gears

I have 4:10s in my 06 GT auto. I love them. I only wish I would have went bigger. Def break them in by driving easy. If you do a lot of interstate driving in the break in just don't hold one speed for a very long time. I.e. Don't use the cruise control.
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Old 05-02-2010, 01:05 PM   #14
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Re: gears

I love my 4.10's also but with the plans I have it makes me wish I would have done the 3.73's
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Old 05-02-2010, 06:29 PM   #15
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Re: gears

Quote:
Originally Posted by DDTCM View Post
I love my 4.10's also but with the plans I have it makes me wish I would have done the 3.73's
power adder I'm guessing
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Old 05-03-2010, 07:46 AM   #16
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Re: gears

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power adder I'm guessing

Yes sir but the 4.10's are makin me think twice about a twin screw so I might go Procharger.I just don't feel like puttin the 3.55 back in or goin to a 3.73.
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Old 05-03-2010, 08:42 AM   #17
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Re: gears

3.55's are about spot on for a power adder car making 400-500rwhp
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Old 05-03-2010, 10:43 AM   #18
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Re: gears

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Originally Posted by SpectorV View Post
3.55's are about spot on for a power adder car making 400-500rwhp
I still have the 3.55 Im just tryin to make up my mind if I wanna pull the 4.10's and go twin screw or stay with the 4.10 and do a centri.
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Old 05-03-2010, 10:54 AM   #19
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Re: gears

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I still have the 3.55 Im just tryin to make up my mind if I wanna pull the 4.10's and go twin screw or stay with the 4.10 and do a centri.
Well, if you'd rather the twin screw, id say wait and do that. Youre better off replacing the gears now then replacing the blower down the road, when you are unhappy with that.

Will you have to upgrade the rear end at all with the blower? My friend was looking to put a kenne bell in his 05 5-speed gt and they said he would have to upgrade his rear to keep it from breaking.
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Old 05-03-2010, 11:04 AM   #20
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Re: gears

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Originally Posted by tigerfan2771 View Post
Well, if you'd rather the twin screw, id say wait and do that. Youre better off replacing the gears now then replacing the blower down the road, when you are unhappy with that.

Will you have to upgrade the rear end at all with the blower? My friend was looking to put a kenne bell in his 05 5-speed gt and they said he would have to upgrade his rear to keep it from breaking.
No,it should be just fine.Lots of people run the stock rear end.
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Old 05-03-2010, 05:00 PM   #21
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Re: gears

Yah it's something how much stronger the 8.8" is compared to the 7.5". About the only thing you could do short of buying a 9" rear would be to upgrade tlok units like an eaton or 31 spline with carbon clutch pack like in the cobras...but that's more geared towards (insert bad pun ) track duty.

You'd probably be fine for street use.
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Old 05-04-2010, 08:28 AM   #22
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Re: gears

yea the 7.5 is just about as strong as the 8.8 the only real weak link is the spider gears in the 7.5 vs the 8.8
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Old 05-04-2010, 08:51 AM   #23
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Re: gears

Any update on the gear install?
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Old 05-05-2010, 09:20 AM   #24
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Re: gears

no new news im still looking for a good mechanic in my area
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Old 05-09-2010, 10:50 PM   #25
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Re: gears

Here is a good answer to your gear "Break in period" got this off of usamustangs.com They are some good guys....


Yes, some techs recommend a break in period, but most don't. I got my first of 3 gear changes done at an actual Ford dealership. I'll never forget how hard I laughed after I asked the actual installer about the break in period do's and don'ts. He said, and I quote: "Break in period? Drive it like you stole it. Have fun at the track this weekend". Then I had my next gear swap done at a local Mustang Performance shop. I asked the same question just for ****s and grins. He said, and I quote: "Break in period, uh, yeah, take it to the track this weekend and hammer the piss out of it. Call me if you have any problems". And that's what I did on both counts.

However, there is nothing wrong with going through a proper break in period. I always recommend to people to do what they feel is right for them. And not just go by what other people say as if it's gospel.
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