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

new guy question on 99GT rear end rebuild

  • Thread starter Thread starter vcustang
  • Start date Start date May 24, 2004
V

vcustang

New Member
Sep 30, 2003
8
0
0
Richmond, VA
May 24, 2004
#1
  • May 24, 2004
  • #1
A performance shop installed my 3.73 gears about 8 months ago. I have a 99GT with 113,339 miles on it. It's a manual.

I'm pretty sure the other day i snaped a tooth off one of the gears because there is excessive play in the driveshaft and shakes when i take off (after the car gets warmed up). The shop told me i should rebuild the rear end soon and I was wondering if someone could tell me what i need to do that. There are a few mods (nothing big) but i may entertain the idea of adding a SC or Nitrous in the future (at least a year). Assuming I buy new 3.73 Rear end gears what else would i need. Because i am not an expert on this subject i dont want some pro shop to take me for a bunch of money. I will more than likely buy the parts i need online and take it to the shop and let them do the labor. From reading other posts it may look like i need:

Ford 31 Spline Traction-Lok
Moser 31 Spline Axles
TA Performance Girdle

I am looking to rebuild as solid as possible now (damn near bullet proof) so I wont have to mess with it again. Is there anything else i may need or would help me rebuild the rear end on my car.. such as a name brand rear end rebuild kit? Also would i have to rebuild the posi trak on my car as well?

thanks in advance.

P.S. what is the difference in 31 Spline and 28 Spline?
 

KJ Hoppus

New Member
Mar 18, 2003
1,008
0
0
Elk Grove CA
May 24, 2004
#2
  • May 24, 2004
  • #2
vcustang said:
A performance shop installed my 3.73 gears about 8 months ago. I have a 99GT with 113,339 miles on it. It's a manual.

I'm pretty sure the other day i snaped a tooth off one of the gears because there is excessive play in the driveshaft and shakes when i take off (after the car gets warmed up). The shop told me i should rebuild the rear end soon and I was wondering if someone could tell me what i need to do that. There are a few mods (nothing big) but i may entertain the idea of adding a SC or Nitrous in the future (at least a year). Assuming I buy new 3.73 Rear end gears what else would i need. Because i am not an expert on this subject i dont want some pro shop to take me for a bunch of money. I will more than likely buy the parts i need online and take it to the shop and let them do the labor. From reading other posts it may look like i need:

Ford 31 Spline Traction-Lok
Moser 31 Spline Axles
TA Performance Girdle

I am looking to rebuild as solid as possible now (damn near bullet proof) so I wont have to mess with it again. Is there anything else i may need or would help me rebuild the rear end on my car.. such as a name brand rear end rebuild kit? Also would i have to rebuild the posi trak on my car as well?

thanks in advance.

P.S. what is the difference in 31 Spline and 28 Spline?
Click to expand...


looks good. i plan on doing the same thing soon. dont forget the Friction Modifier, Lube, and Install Kit.
 
You must log in or register to reply here.

Similar threads

J
2004 Mustang 3.8L V6 vibrations above 65 MPH and differential leaks
  • joeybuddy96
  • Mar 16, 2026
  • SN95 V6 Mustang Tech
Replies
16
Views
588
SN95 V6 Mustang Tech Jul 14, 2026
joeybuddy96
J
S
Cobra 8.8 differential rebuild shop question
  • Sestemybe
  • Aug 5, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
4
Views
348
1996 - 2004 SN95 Mustang -General/Talk- Nov 15, 2025
baileygruwell
B
new :poo: box, may need to hit you guys up for 79-82 info when i fix thIs turd.
  • rednotch
  • Sep 27, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2 3
Replies
40
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Apr 4, 2026
Noobz347
Tuners come on inside
  • squeak93
  • Feb 13, 2026
  • SVT Tech Forum
Replies
1
Views
258
SVT Tech Forum Feb 20, 2026
squeak93
Rear end
  • RileyDymond
  • Feb 22, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
13
Views
828
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 13, 2025
revhead347
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?