3.73 gear DIY install - Mustang Evolution

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Old 10-09-2012, 07:29 PM   #1
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3.73 gear DIY install

Anyone install 3.73's themself. Im looking to do my own work. Im pretty damn mechanically inclined, i just want to know if there is people out there that have installed them or anyother gear ratios themselves. Just in case i get stuck. If so, what was the most difficult part in installing them?? Thanks
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Old 10-09-2012, 08:33 PM   #2
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i have done a few. its actually pretty easy if you ask me. you will need a few specialty tools. i was able to get what i dont have work.

you will need a bearing seperator and puller. a press is handy but can be done without. but i found a a pipe the size of the inner race and the bearngs tapped on the new gears.

you will also need a micrometer and dial indicator.

now since you probably wont be buying the master install kit i would get some gear mesh compound. that usually comes with the kit that wont be buying.

it sounds complicated but its really not bad at all. the hardest part if you dont have an extra hand is getting the carrier bolted back in with the shims and outer races. its like you need 3 hands. lol

with all that said and the special tools you need, most likely you will be ale to get away with all the same shims that are in there as long as you use the frpp gears. but will still need checked.
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Old 10-09-2012, 09:48 PM   #3
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i have done a few. its actually pretty easy if you ask me. you will need a few specialty tools. i was able to get what i dont have work.

you will need a bearing seperator and puller. a press is handy but can be done without. but i found a a pipe the size of the inner race and the bearngs tapped on the new gears.

you will also need a micrometer and dial indicator.

now since you probably wont be buying the master install kit i would get some gear mesh compound. that usually comes with the kit that wont be buying.

it sounds complicated but its really not bad at all. the hardest part if you dont have an extra hand is getting the carrier bolted back in with the shims and outer races. its like you need 3 hands. lol

with all that said and the special tools you need, most likely you will be ale to get away with all the same shims that are in there as long as you use the frpp gears. but will still need checked.
thats the truth about the 3 hands..lol
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Old 10-09-2012, 09:53 PM   #4
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Thanks alot, and the heads up on the tools needed. Im going to place my order on the gears and give it a shot.
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Old 10-09-2012, 10:00 PM   #5
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Thanks alot, and the heads up on the tools needed. Im going to place my order on the gears and give it a shot.
your welcome and good luck. i would study some how tos before you tackle it just to give you a good idea.
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Old 10-09-2012, 10:05 PM   #6
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Thanks alot, and the heads up on the tools needed. Im going to place my order on the gears and give it a shot.
More power too ya man. Local place in Cincy does gear swaps for 550.

Once I started adding everything up and such, the labor was dirt cheap from them. Specially since I didn't have the correct tools.

Not to count the fact that the guy, who the shop ONLY works on mustangs, had never seen my pinion bearing before in a 2011, and told me it probably would break, and of course it did, and they even gave me that part for DIRT cheap. Like 20 bucks. Think they sell for 50 ish bucks.
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Old 10-10-2012, 07:14 PM   #7
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They want 450 just for the labor here in bklyn ny and 180 for the gears and 100 for the install kit total 700 having my 373 done this week can't wait
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Old 10-10-2012, 08:51 PM   #8
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Yep, im definately going to be doing the install myself. Screw spending all that dough for labor. Ill buy the tools. Its nice having tools anyways.
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Old 10-10-2012, 08:53 PM   #9
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Yep, im definately going to be doing the install myself. Screw spending all that dough for labor. Ill buy the tools. Its nice having tools anyways.
right on. thats how i am to. if you have a harbor frieght near you the tools can be had relativley cheap.
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Old 10-10-2012, 10:39 PM   #10
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I have MAC tools nearby, pretty good quality. I dont have harbor freight round here. Yeah, im looking at trying to learn as much as i can by doing my own work. This way i know im never being over charged, or bamboozled. My wife always ask me to take the cars into the dealership for issues. I just give her that look while i spend hours troubleshooting.
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Old 10-11-2012, 04:55 AM   #11
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I have MAC tools nearby, pretty good quality. I dont have harbor freight round here. Yeah, im looking at trying to learn as much as i can by doing my own work. This way i know im never being over charged, or bamboozled. My wife always ask me to take the cars into the dealership for issues. I just give her that look while i spend hours troubleshooting.
Exactly! Mac are way better than harbor freight.
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Old 10-11-2012, 08:48 AM   #12
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More power too ya man. Local place in Cincy does gear swaps for 550.

Once I started adding everything up and such, the labor was dirt cheap from them. Specially since I didn't have the correct tools.

Not to count the fact that the guy, who the shop ONLY works on mustangs, had never seen my pinion bearing before in a 2011, and told me it probably would break, and of course it did, and they even gave me that part for DIRT cheap. Like 20 bucks. Think they sell for 50 ish bucks.
What place is that. Does 550 include the gear?
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Old 10-11-2012, 08:54 AM   #13
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dont do it, get a pro to handle gears. It nearly never ever works out right. You need experience in that dept. to get them installed worry free and noise free. You can of course learn the hard way if you wish.
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Old 10-11-2012, 09:21 AM   #14
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Im willing to learn from my mistakes. Being doing it my whole life, lol.
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Old 10-11-2012, 09:24 AM   #15
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Im willing to learn from my mistakes. Being doing it my whole life, lol.
Buy a couple spare differential and sets of gears...
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Old 10-11-2012, 09:26 AM   #16
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yea, its great you want to learn, I would suggest learning on someone elses car though.

If you dont mind buying a couple spare sets of gears and doing it 3 times then go for it. Also after that it may still be off~ and you may end up having a pro do it. Just a warning of course, do what ever you wish and have fun just know the risks.

Another solution is to find someone REALLY good at doing gears, get them to do the install while you hang out and learn/help. It sounds really simple, but its not how it ends up I love doing my own stuff, but gears are an art vs just go by the books.
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Old 10-11-2012, 10:43 AM   #17
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yea, its great you want to learn, I would suggest learning on someone elses car though.

If you dont mind buying a couple spare sets of gears and doing it 3 times then go for it. Also after that it may still be off~ and you may end up having a pro do it. Just a warning of course, do what ever you wish and have fun just know the risks.

Another solution is to find someone REALLY good at doing gears, get them to do the install while you hang out and learn/help. It sounds really simple, but its not how it ends up I love doing my own stuff, but gears are an art vs just go by the books.
It's definitely a good warning.
After the install listen very closely for any whining. That way you don't tear anything up.
To me they are not hard at all. I do have an alignment background from working in the mills though.
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Old 10-11-2012, 12:49 PM   #18
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appreciate the warnings, and i will be buying a spare set of diffs and gears just in case. thanks
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Old 10-11-2012, 01:52 PM   #19
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What place is that. Does 550 include the gear?
Paul's automotive and engineering. Mustang only shop.

Yes 550 included everything. Minus the pinion bearing that broke, but generally that doesn't happen cause people have normal ones and not the weird one I had.

Also kept my old gears. So it wasn't like they were trying to sell them or anything. Not that they'd get much for them.
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Old 10-11-2012, 02:51 PM   #20
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Paul's automotive and engineering. Mustang only shop.

Yes 550 included everything. Minus the pinion bearing that broke, but generally that doesn't happen cause people have normal ones and not the weird one I had.

Also kept my old gears. So it wasn't like they were trying to sell them or anything. Not that they'd get much for them.
Paul's is good.
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Old 10-11-2012, 03:19 PM   #21
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Paul's is good.
Yeah I was going to have them do the o/r x pipe if I couldn't have gotten that bolt free.

They are also extremely honest. I have had them steer me away from upgrades because they were unneeded.
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Old 02-05-2013, 09:13 AM   #22
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I would suggest starting your own thread.
Done
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Old 04-23-2013, 06:44 PM   #23
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INSTALL

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Originally Posted by 2013_stang_gt View Post
Anyone install 3.73's themself. Im looking to do my own work. Im pretty damn mechanically inclined, i just want to know if there is people out there that have installed them or anyother gear ratios themselves. Just in case i get stuck. If so, what was the most difficult part in installing them?? Thanks
hey bud, did you do the install yourself? if so, how did it go? ive got 3.73 im wanting to put in as well myself. so i was just wondering. im a mechanic by trade, but have never installed gears........
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Old 04-23-2013, 06:58 PM   #24
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hey bud, did you do the install yourself? if so, how did it go? ive got 3.73 im wanting to put in as well myself. so i was just wondering. im a mechanic by trade, but have never installed gears........
You can do it, knowing how to shim it to adjust the wear pattern is what separates a good job from a bad one. There's a lot of videos and reading material out there.
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Old 04-23-2013, 07:03 PM   #25
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You can do it, knowing how to shim it to adjust the wear pattern is what separates a good job from a bad one. There's a lot of videos and reading material out there.
Agreed. Not having done them before I would honestly want to do them with someone who has just to get a feel for it.
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Old 04-23-2013, 07:20 PM   #26
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Just got mine done today, its a big job and its better that someone with experience does it
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Old 04-23-2013, 07:29 PM   #27
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Just got mine done today, its a big job and its better that someone with experience does it
How much was installation? Where u located at? Im planning to put one on mine..
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Old 04-23-2013, 07:35 PM   #28
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Just to add I live in Cincinnati and paid 550 for the change. All parts plus labor.
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Old 04-23-2013, 07:36 PM   #29
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How much was installation? Where u located at? Im planning to put one on mine..
I did mine near the shore in Jersey, at Big Daddy Performance for $750 and I supplied the fluid and they got everything else... I know it's pricey, but they're a top notch Mustang shop and they do it right the 1st time.. It came out very good with zero whine... Only put about 80 miles on it so far so I'm still breaking it in
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Old 04-23-2013, 07:44 PM   #30
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I did mine near the shore in Jersey, at Big Daddy Performance for $750 and I supplied the fluid and they got everything else... I know it's pricey, but they're a top notch Mustang shop and they do it right the 1st time.. It came out very good with zero whine... Only put about 80 miles on it so far so I'm still breaking it in
Nice... Too bad your too far but ill be going there for a drive while waiting at the casino lol..
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Old 04-23-2013, 08:00 PM   #31
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Only thing is that my car kinda feels the same... On the highway in 6th going about 80 I'm still at about 2,100 rpms... Can anyone with 3.73s chime in and tell me if that seems right?? Could I need a revised tune??
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Old 04-23-2013, 08:25 PM   #32
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Only thing is that my car kinda feels the same... On the highway in 6th going about 80 I'm still at about 2,100 rpms... Can anyone with 3.73s chime in and tell me if that seems right?? Could I need a revised tune??
Wow how. I sit nearly 2500RPMs at 80MPH with 3.73s.
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Old 04-23-2013, 08:25 PM   #33
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Only thing is that my car kinda feels the same... On the highway in 6th going about 80 I'm still at about 2,100 rpms... Can anyone with 3.73s chime in and tell me if that seems right?? Could I need a revised tune??
At 80 Im at 2500 easy
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Old 04-23-2013, 08:30 PM   #34
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Yea I knew something wasnt right!! I'm guessing its the tune then?? I put in the tune AM gave me... Everything feels the same as my 3.31s did so far :-/
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Old 04-23-2013, 08:38 PM   #35
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At 80 Im at 2500 easy
Ya same for me too with 3:73s.
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