What do I need to go from 3.31 to 3.73 Gears?? - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 02-14-2013 Thread Starter
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What do I need to go from 3.31 to 3.73 Gears??

So I am planning on switching out my gears in my 07 GT from 3.31 to 3.73. What all do I need to get? I am ordering them from AM and I was looking at the gear kit for $259 with gears and all the bearings, shims and oils to change them out. Should I get that kit or do I just need the gear kit for $159? Thanks

2007 Mustang GT 4.6L V-8, 5SPD, FRPP 4.10, JLT CAI and 93 BAMA Race Tune, JBA Longtube Headers and O/R H Pipe, Pypes Pipe Bomb Axle-Backs, Koni STR-T, GT500 Strut Mounts, SR Springs, BMR Panhard Bar and Support Brace, BBR LCA'S, SR Strut Bar, MGW Shifter, GT500 Wing, Roush Louvers, CDC Chin Spoiler, Blacked out Windows and Lights, 6000K HIDS, 19X8.5 and 19X10 Black Bullitt Wheels, Pioneer
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post #2 of 9 (permalink) Old 02-14-2013
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It's better if you get the kit. You might also need a tune to recalibrate your speedometer.
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post #3 of 9 (permalink) Old 02-14-2013
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259$ sounds like a good deal I am assuming installation is the hard part?
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post #4 of 9 (permalink) Old 02-14-2013
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Quote:
Originally Posted by TsGT1977 View Post
259$ sounds like a good deal I am assuming installation is the hard part?
That would be correct. And regardless of whether you do it yourself or take it somewhere, better to have the complete kit. For one thing, while you could reuse your old bearings if there isn't too much mileage on them, having at least a new set of pinion bearings means you can dremel out the old ones which would allow you to slide them on and off without a press which makes setting up the shim depth much less of a pain. Or, if you take it somewhere for the install and have the kit they won't be able to charge you a markup for having to order anything.

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post #5 of 9 (permalink) Old 02-14-2013
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I doubt you will save much money by buying the parts and then paying someone to install them ; probably better off finding a local shop that does this kind of work and buying the complete install and parts from them.

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post #6 of 9 (permalink) Old 02-14-2013 Thread Starter
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I am planning on getting it done at a shop because gears seem pretty involved to me and I'd rather get it done in a couple hrs than days haha but the car only has 25k on it, that's why I wasn't sure if I needed the whole kit.

2007 Mustang GT 4.6L V-8, 5SPD, FRPP 4.10, JLT CAI and 93 BAMA Race Tune, JBA Longtube Headers and O/R H Pipe, Pypes Pipe Bomb Axle-Backs, Koni STR-T, GT500 Strut Mounts, SR Springs, BMR Panhard Bar and Support Brace, BBR LCA'S, SR Strut Bar, MGW Shifter, GT500 Wing, Roush Louvers, CDC Chin Spoiler, Blacked out Windows and Lights, 6000K HIDS, 19X8.5 and 19X10 Black Bullitt Wheels, Pioneer
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post #7 of 9 (permalink) Old 02-15-2013
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I had 3.73s on my s/c 05 and loved them! Install from a shop will vary anywhere between $400-$500+...also be prepared to be without your stang for atleast half the day...May be a little faster depending on where ya go tho.

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post #8 of 9 (permalink) Old 02-15-2013
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Quote:
Originally Posted by JBert View Post
I doubt you will save much money by buying the parts and then paying someone to install them ; probably better off finding a local shop that does this kind of work and buying the complete install and parts from them.
I disagree. They'll just mark up those parts and charge you even more. BUT so does AM. I'd give an Ebay seller or Summit a shot.

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Originally Posted by TRAVISGT3 View Post
I am planning on getting it done at a shop because gears seem pretty involved to me and I'd rather get it done in a couple hrs than days haha but the car only has 25k on it, that's why I wasn't sure if I needed the whole kit.
I had a mechanic buddy help me out and it wasn't as hard as I thought it would be. Took us probably 5-6 hours. If you only have 25k on the bearings, I really wouldn't worry about switching them out. I guess you can if you want though.

If you don't feel comfortable working on a dif, don't do it.
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post #9 of 9 (permalink) Old 02-15-2013
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I'd vote for the kit, you'll need most if not all of the parts. I also suggest having someone do the install that knows how to do it correctly. There is a member here (I think big_gear_head?) that really knows this stuff. He had a link to a video of someone doing the shim adjustments, not something I would tackle..
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