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Old 07-30-2012, 05:24 PM   #1
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3.73 Gears

To those of you that have swapped gears, what additional expenses will I have for parts and labor to swap gears? I assume you have to do a complete rebuild with new bearings and everything?

Thanks.
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Old 07-30-2012, 05:37 PM   #2
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Re: 3.73 Gears

never have swapped gears, but there should be no need for new anything on a '13, except MAYBE a gasket and definitely gear oil
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Old 07-30-2012, 05:54 PM   #3
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Re: 3.73 Gears

Yeah, I didn't think so either. One shop I called told me that the bearings are damaged when the assembly is taken apart so you have to replace everything. Doesn't make sense to me.
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Old 07-30-2012, 05:57 PM   #4
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Re: 3.73 Gears

sounds like they are either trying to cover their asses if something goes bad or maybe already is, or they don't know WTF they're talking about
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Old 07-30-2012, 09:46 PM   #5
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Quote:
Originally Posted by Jetag93
Yeah, I didn't think so either. One shop I called told me that the bearings are damaged when the assembly is taken apart so you have to replace everything. Doesn't make sense to me.
The bearings can be damaged during disassembly, thats why most good shops keep them in stock. If you know what your doing and take your time it can be fine without anything other than a gasket(which sucks, high quality silicone works better) and gear oil. I think its only 70-80 bucks for the full install kit. Depending on your vehicles mileage and the shop thats doing the job typically its worth just putting all new on. Its easier for them. Good luck.
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Old 07-31-2012, 12:36 AM   #6
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Re: 3.73 Gears

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Originally Posted by Jetag93 View Post
Yeah, I didn't think so either. One shop I called told me that the bearings are damaged when the assembly is taken apart so you have to replace everything. Doesn't make sense to me.
Shop i talked to recommended the same thing.
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Old 07-31-2012, 07:19 AM   #7
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Re: 3.73 Gears

Thanks guys. I read the Ford Racing installation pdf on Americanmuscle.com and it's frickin complicated! So far I have quotes of $650 from a local performance shop, $1500 from a Trans/Rear End specialist shop, and $2500 from the dealer. The performance shop didn't mention anything but new seal and royal purple gear oil. So, I don't know what to think.
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Old 07-31-2012, 07:42 AM   #8
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Quote:
Originally Posted by Jetag93
Thanks guys. I read the Ford Racing installation pdf on Americanmuscle.com and it's frickin complicated! So far I have quotes of $650 from a local performance shop, $1500 from a Trans/Rear End specialist shop, and $2500 from the dealer. The performance shop didn't mention anything but new seal and royal purple gear oil. So, I don't know what to think.
Where are u from? If your close by I can help you out. I installed my 4.10 gear myself and took my time completing the job in under two hours. I have put about 5-6k miles on the new gears with zero problems. I do recommend buying a new pinion bearing from ford and using it with the new pinion. That way if you decide to go back to the original gear, no need to swap bearings and risk damaging them, while removing them off the pinion gear. The bearing from ford costs around 70-80 dollars.
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Old 07-31-2012, 08:24 AM   #9
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Re: 3.73 Gears

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Where are u from? If your close by I can help you out. I installed my 4.10 gear myself and took my time completing the job in under two hours. I have put about 5-6k miles on the new gears with zero problems. I do recommend buying a new pinion bearing from ford and using it with the new pinion. That way if you decide to go back to the original gear, no need to swap bearings and risk damaging them, while removing them off the pinion gear. The bearing from ford costs around 70-80 dollars.
Looks like you're in IL. I'm near Houston, but thanks for the offer and info.
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Old 07-31-2012, 11:26 AM   #10
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Quote:
Originally Posted by Jetag93
To those of you that have swapped gears, what additional expenses will I have for parts and labor to swap gears? I assume you have to do a complete rebuild with new bearings and everything?

Thanks.
I would really like to learn about the mustang gearing, are you trying to go from 3.73 to something else? I have the 3.73 on mine, but dont see how it would be that beneficial to change them.
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Old 07-31-2012, 12:17 PM   #11
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Had an 11 5.0 with a 3.31 and my 12 now has a 3.73... Maybe it's me. I think the 3.31 was a lot better. Would almost like to go back.
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Old 07-31-2012, 01:21 PM   #12
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Re: 3.73 Gears

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Originally Posted by Bowtiebeater View Post
Had an 11 5.0 with a 3.31 and my 12 now has a 3.73... Maybe it's me. I think the 3.31 was a lot better. Would almost like to go back.
What do you like better about the 3.31's? I was wanting to change to 3.73 for more low end power. Will be adding a Boss Intake also which I've read is best mated with the 3.73?
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Old 07-31-2012, 01:21 PM   #13
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Re: 3.73 Gears

I am looking to go to 3.73, my installation quotes here(Ohio/IndianaBorder) are crazy over 1k. Ridiculous, until I find something better I'm stuck with this desert gear.
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Old 07-31-2012, 01:23 PM   #14
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Re: 3.73 Gears

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Originally Posted by gweze001 View Post
I would really like to learn about the mustang gearing, are you trying to go from 3.73 to something else? I have the 3.73 on mine, but dont see how it would be that beneficial to change them.
change from 3.31 to 3.73.
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Old 07-31-2012, 01:32 PM   #15
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Quote:
Originally Posted by Jetag93

change from 3.31 to 3.73.
What are you trying to get/lose by doing that?
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Old 07-31-2012, 02:07 PM   #16
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Originally Posted by GrabberBlue305
I am looking to go to 3.73, my installation quotes here(Ohio/IndianaBorder) are crazy over 1k. Ridiculous, until I find something better I'm stuck with this desert gear.
Call pickupspluscars in Columbus, oh. I'm wanting to say they were around $350 for an install and they had good pricing on frpp gears too.
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Old 07-31-2012, 03:17 PM   #17
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Originally Posted by Bowtiebeater
Had an 11 5.0 with a 3.31 and my 12 now has a 3.73... Maybe it's me. I think the 3.31 was a lot better. Would almost like to go back.
Why do u say that wat u like about the 331 vs 373
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Old 07-31-2012, 03:23 PM   #18
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Re: 3.73 Gears

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Originally Posted by gweze001 View Post
What are you trying to get/lose by doing that?
Quote:
Originally Posted by Jetag93 View Post
I was wanting to change to 3.73 for more low end power. Will be adding a Boss Intake also which I've read is best mated with the 3.73?
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Old 08-01-2012, 01:58 AM   #19
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Re: 3.73 Gears

3.31 just seamed perfect for the 5.0. First gear with the 3.73's is worthless IMHO. Then again with the boss intake maybe its better.?. Maybe its just me but I really think my 11 was faster. Even my Girlfriend thinks so.. It's not a great as your going to expect to be I promiss you that.

My buddy at work also has a Bama Tune and a CAI with 3.73's on his 11. Mine is stock with nothing but Roush exhaust. And when I was in his, and he got on it I could not feel any real improvement. I was not blown away lets just say that.

Don't get me wrong I love the 5.0 and am impressed with the car. Just really feel like my 11 was faster thru the gears and more fluid.. Hard to put in words..


Sorry for the late reply.
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Old 08-01-2012, 03:13 AM   #20
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Quote:
Originally Posted by Bowtiebeater
3.31 just seamed perfect for the 5.0. First gear with the 3.73's is worthless IMHO. Then again with the boss intake maybe its better.?. Maybe its just me but I really think my 11 was faster. Even my Girlfriend thinks so.. It's not a great as your going to expect to be I promiss you that.

My buddy at work also has a Bama Tune and a CAI with 3.73's on his 11. Mine is stock with nothing but Roush exhaust. And when I was in his, and he got on it I could not feel any real improvement. I was not blown away lets just say that.

Don't get me wrong I love the 5.0 and am impressed with the car. Just really feel like my 11 was faster thru the gears and more fluid.. Hard to put in words..

Sorry for the late reply.
Key word is FEELS. I doubt the 11 w 3.31is faster than the 12 with 3.73.
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Old 08-01-2012, 05:42 AM   #21
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Quote:
Originally Posted by Bowtiebeater
3.31 just seamed perfect for the 5.0. First gear with the 3.73's is worthless IMHO. Then again with the boss intake maybe its better.?. Maybe its just me but I really think my 11 was faster. Even my Girlfriend thinks so.. It's not a great as your going to expect to be I promiss you that.

My buddy at work also has a Bama Tune and a CAI with 3.73's on his 11. Mine is stock with nothing but Roush exhaust. And when I was in his, and he got on it I could not feel any real improvement. I was not blown away lets just say that.

Don't get me wrong I love the 5.0 and am impressed with the car. Just really feel like my 11 was faster thru the gears and more fluid.. Hard to put in words..

Sorry for the late reply.
Cool I got a 12 with 331 and I understand wat u sayin my car pulls hard thru 1 st and second Hell all the gears lol but I see where u commin from. 373 1st gear useless un less u at the tack wit good tires my as. Chevelle as has 410 and first is usless unless I'm at the track just burns a lot of rubber
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Old 08-01-2012, 08:11 AM   #22
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Thumbs up Re: 3.73 Gears

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Originally Posted by Napoleon85 View Post
Call pickupspluscars in Columbus, oh. I'm wanting to say they were around $350 for an install and they had good pricing on frpp gears too.
Thanks! I will look into them, great people here!
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Old 08-01-2012, 10:44 AM   #23
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On a stock car w/ 3.73 you'll run out of gear ~150 ft short of the finish line in the 1/4.
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Old 08-01-2012, 12:22 PM   #24
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Quote:
Originally Posted by Edens5

Key word is FEELS. I doubt the 11 w 3.31is faster than the 12 with 3.73.
Hard to spend money on HP improvement parts that don't make me smile or " feel" like they are worth it. Just trying to give the guy an idea on maybe pointing his money in another direction. I will say this. The exhaust note with the quicker shifts sound great.
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Old 08-01-2012, 03:21 PM   #25
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Re: 3.73 Gears

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On a stock car w/ 3.73 you'll run out of gear ~150 ft short of the finish line in the 1/4.
No you won't, unless you're running a 26" tire. Stock Brembo car is ~28" and you can make the 1/4 in 4th. For drag tires on 3.73, recommend 28". You get the leverage of 3.73 plus being able to 1/4 in one less gearchange. I have 26" drag tires from a previous mount; the stick up front pays off more than the loss of having to shift to 5th before the stripe.

Once you get rid of the useless stock upper control arm or, tame the wheelhop by other methods, you can lay down power extremely well on this car, in my experience, even with 3.73s. I can make 60 mph in a just a tick over 4 seconds, on the road, with the factory summer Pirellis.
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Old 08-01-2012, 03:40 PM   #26
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Yes you will. I ran 7 times down the track 2 weeks ago. Hit rev limiter in 4th early every time. Trap speed 110.8 coasting through.
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Old 08-01-2012, 03:46 PM   #27
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Re: 3.73 Gears

Something's up. I'm trapping 112-114 and I can make the 1/4 in 4th just touching what I guess is the soft cut at the stripe and having the slightest lay-down. Certainly not 150' out, maybe the last 50. 26" requires the shift to 5th though, guaranteed.

Just did a little math and the conclusion is, on a 28" tire, 4th should be good for 118 mph @ 7000 rpm. Even a 26" tire should allow about 110.
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Old 08-01-2012, 04:23 PM   #28
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I have been running the stock tires with 3.73 and have trapped 111 and had a little left. With stock rev limiter I can hit about 115 in 4th
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Old 08-01-2012, 04:59 PM   #29
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So witch gear do u guys prefer 331 or 373 and why I don't take it to the track just street driving

---------- Post added at 04:59 PM ---------- Previous post was at 04:59 PM ----------

Quote:
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So witch gear do u guys prefer 331 or 373 and why I don't take it to the track just street driving
I have a brembo car also
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Old 08-01-2012, 05:33 PM   #30
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So witch gear do u guys prefer 331 or 373 and why I don't take it to the track just street driving

---------- Post added at 04:59 PM ---------- Previous post was at 04:59 PM ----------



I have a brembo car also
3.73 is with the boss n track packs, which ford considers to be the superior performance packages of the 5.0. 3.31 is probably more suited for a street driving car. Some people say the 3.73 is a loss in power to them i say, why is it in the boss and track pack then?

---------- Post added at 06:33 PM ---------- Previous post was at 06:32 PM ----------

Without mods 3.31 is better
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Old 08-01-2012, 06:43 PM   #31
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Last Friday night went to the track and stayed In 4th 110.22 pulling right on through the traps. 3.73 brembo on stock tires
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Old 08-01-2012, 06:43 PM   #32
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if you are staying NA then 3.73 or 3.90. if going FI then you will be better off with 3.31 or 3.55
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Old 08-01-2012, 07:22 PM   #33
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if you are staying NA then 3.73 or 3.90. if going FI then you will be better off with 3.31 or 3.55
na ...fi ? Wat do that mean
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Old 08-01-2012, 07:27 PM   #34
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na ...fi ? Wat do that mean
Naturally aspirated/ forced induction
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Old 08-01-2012, 08:29 PM   #35
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Naturally aspirated/ forced induction
Got ya
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