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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

3:73 Install??

  • Thread starter Thread starter stang_man_1
  • Start date Start date Feb 20, 2006
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stang_man_1

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Feb 17, 2006
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#1
  • Feb 20, 2006
  • #1
Thinking about getting 3:73s. Anything i should know about the install? Any ideas on what brand i should get?

Any info would be greatly appreciated.
 

sgarlic

Founding Member
Apr 21, 2001
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Feb 20, 2006
#2
  • Feb 20, 2006
  • #2
I'd get FMS's. They're the same thing as FRPP but labeled differently. Motive's are ok too, but made overseas if that makes a difference to you.

I'm assuming since you're taking the job on yourself that you know what you're doing.. not probably something a person who doesn't feel comfortable with tools should tackle.. do your homework, get new parts (crush sleeves, etc) take your time, work in a clean space, and you'll be good.
 

stang_man_1

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#3
  • Feb 20, 2006
  • #3
sgarlic said:
I'd get FMS's. They're the same thing as FRPP but labeled differently. Motive's are ok too, but made overseas if that makes a difference to you.

I'm assuming since you're taking the job on yourself that you know what you're doing.. not probably something a person who doesn't feel comfortable with tools should tackle.. do your homework, get new parts (crush sleeves, etc) take your time, work in a clean space, and you'll be good.
Click to expand...


I've never done anything like this before, but i do know my way around a tool box. I heard that if you don't do it right they'll whine so that's really why i was asking. i don't want to do it wrong
 

laxdman20

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Nov 20, 2003
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Va.
Feb 20, 2006
#4
  • Feb 20, 2006
  • #4
No offence, but you probably shouldn't do it yourself. If you want your rear end to work right and not "sing" then you should take it to a shop. There are specs you need to know and tools you will need that the normal do it yourselfer wont have. You dont want to ruin those nice new gears. And I went with ford racing 3:73's. I had a rear end guy at work install them cause I wanted them perfect. And dont think Im trying to hate on your skills, just trying to help.
 
K

Kilgore Trout

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#5
  • Feb 20, 2006
  • #5
Its a tricky install...
 
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01Steeda

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May 29, 2005
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Feb 20, 2006
#6
  • Feb 20, 2006
  • #6
I definatly wouldnt try it and I have been building cars with my dad since I was 15. like said above the specs are tight and youll need special tools. Absolutley worth paying for install.
 

stang_man_1

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#7
  • Feb 20, 2006
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I still haven't decided whether or not i'll do it myself. What id really like is some details and maby some pics or vids.

Any idea on the price of the install.
 
K

Kilgore Trout

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#8
  • Feb 20, 2006
  • #8
Step by step, with pics

http://www.corral.net/tech/drivetrain/gears.html
 

csledd

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Aug 18, 2001
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Paducah, KY
Feb 20, 2006
#9
  • Feb 20, 2006
  • #9
I wouldn't recommend you do it either unless you're familiar with shimming gears down to a hundreth of a degree of correctness. If it's correct they'll not only whine but wear down A LOT quicker and will need to be replaced. I had to use a press for my install for the crush sleeve I believe. And of course, the shimming part is not easy.




oh and gear oil smells like some rotten booty
 
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06silverstangGT

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Feb 20, 2006
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#10
  • Feb 20, 2006
  • #10
I am wanting to do a gear change and am considering going to the 4.73 gears as well. Any information you can provide about your decision making process would be appreciated. It seems to me that I would get enough torque to feel it, but still be able to do my everyday freeway driving without running too high RPM's. Am I thinking right?????? Thanks.
 

csledd

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#11
  • Feb 20, 2006
  • #11
06silverstangGT said:
I am wanting to do a gear change and am considering going to the 4.73 gears as well. Any information you can provide about your decision making process would be appreciated. It seems to me that I would get enough torque to feel it, but still be able to do my everyday freeway driving without running too high RPM's. Am I thinking right?????? Thanks.
Click to expand...
well gears are a torque multiplier... which means the higher the gear number the greater the force you'll have to move your car with. a lot of people who get 3.73 do sometimes regret it and switch to 4.10s. 4.10s are awesome and I love mine. I do interstate driving everyday also. The decision is mostly in how you drive and what your future plans are for your car. If you plan for Forced Induction for your future than you wanna go with 3.73s most likely. When I had my stock gears I use to go 80 mph on the interstate everyday. When I got the 4.10s I started doing 70 mph and got the same gas mileage. Nobody can tell you what gear is right for you, it's all personal preference. I will tell you though if I get on my car a lot the gas goes QUICK.
 

stang_man_1

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#12
  • Feb 20, 2006
  • #12
Thanks guys. I'll probably have someone do it. Any idea how much it will cost. Would this ratio be the best for me. I do a lot of freeway driving.
 

csledd

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#13
  • Feb 20, 2006
  • #13
stang_man_1 said:
Thanks guys. I'll probably have someone do it. Any idea how much it will cost. Would this ratio be the best for me. I do a lot of freeway driving.
Click to expand...
I dunno if you seen my previous post, 3.73 are great for freeway driving, but 4.10's can be also.. it's all in how you drive the car.
 
J

Justin03GT

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Mar 30, 2005
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Mount Pleasant, SC
Feb 20, 2006
#14
  • Feb 20, 2006
  • #14
i got used FRPP 3.73s, did the install going in blind having never done it before, used the old crush sleeve, no special tools were needed, although a set of air tools does help...did the install in 3 hours which included 2 trips to parts store for sockets i didnt have...its not THAT hard to do...if you are mechanically inclined you should be able to get them in just fine and not have them whine...like i said mine were used and i didnt set the backlash with a mic, just by feel and they dont whine, clunk or do anything odd...
 
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01Steeda

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May 29, 2005
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Baton Rouge, LA
Feb 20, 2006
#15
  • Feb 20, 2006
  • #15
3.73's here... 4.10's coming soon
 
K

Kilgore Trout

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#16
  • Feb 20, 2006
  • #16
Justin03GT said:
i got used FRPP 3.73s, did the install going in blind having never done it before, used the old crush sleeve, no special tools were needed, although a set of air tools does help...did the install in 3 hours which included 2 trips to parts store for sockets i didnt have...its not THAT hard to do...if you are mechanically inclined you should be able to get them in just fine and not have them whine...like i said mine were used and i didnt set the backlash with a mic, just by feel and they dont whine, clunk or do anything odd...
Click to expand...
How did you set the preload on the crush sleeve? Did you have an inch pound torque wrench?
 
J

Justin03GT

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Feb 20, 2006
#17
  • Feb 20, 2006
  • #17
yes i used an IN/LB...
 
K

Kilgore Trout

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  • Feb 20, 2006
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Did you have a magnetic base dial indicator for the backlash as well???
 

stang_man_1

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#19
  • Feb 20, 2006
  • #19
Could you guys explain the backlash and the crush sleave and any other details i need to know about please.
 
K

Kilgore Trout

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#20
  • Feb 20, 2006
  • #20
I already linked it man... post #8 in this thread
 
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