3.73 gear swap - any FYI's to know about? - MustangForums.com


V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

Reply
 
 
 
Thread Tools Search this Thread
Old 05-22-2013, 06:00 PM   #1
Toadster
1st Gear Member
Thread Starter
 
Toadster's Avatar
 
Join Date: Apr 2013
Location: CA
Posts: 127
Lightbulb 3.73 gear swap - any FYI's to know about?

considering our 'stang has ~146k miles on it and the rear diff will most likely go in the next 5k miles - we're considering a bump to the posi diff and 3.73 gears

obviously there's the cost in getting this done and a local shop will do the swap from open to posi plus gears for ~$900

what caveats should we look out for? any oil recommendations? also what about daily wear/tear?

the shorter gears will reduce highway mileage, but around town I'd expect the same or maybe better?
Toadster is offline   Reply With Quote
Old 05-22-2013, 11:01 PM   #2
Toadster
1st Gear Member
Thread Starter
 
Toadster's Avatar
 
Join Date: Apr 2013
Location: CA
Posts: 127
Default

nobody?
Toadster is offline   Reply With Quote
Old 05-26-2013, 10:06 PM   #3
302_Mustang
1st Gear Member
 
Join Date: May 2013
Location: Delaware
Posts: 58
Default

If I were you I would do a rear swap from a GT. I had 99 V6 and got a rear from 99 GT with 67K for $100. The GT rears come with a factory Limited slip. They are also stronger than the factory 7.5 that came in the V6. It would also be cheaper than buying a Posi rear for a 7.5, the last time I checked they were around $450 not including installion. If you do decide to do a rear swap it is VERY easy. All you got to do is drop your old rear and bolt up your new one, everything lines up with no modification. Lets say you pick up a rear off a GT for around $150 and the gears for $160 plus installation $300 it would be almost half of you estimated cost.
302_Mustang is offline   Reply With Quote
Old 05-28-2013, 05:39 PM   #4
Toadster
1st Gear Member
Thread Starter
 
Toadster's Avatar
 
Join Date: Apr 2013
Location: CA
Posts: 127
Default

Quote:
Originally Posted by 302_Mustang View Post
If I were you I would do a rear swap from a GT. I had 99 V6 and got a rear from 99 GT with 67K for $100. The GT rears come with a factory Limited slip. They are also stronger than the factory 7.5 that came in the V6. It would also be cheaper than buying a Posi rear for a 7.5, the last time I checked they were around $450 not including installion. If you do decide to do a rear swap it is VERY easy. All you got to do is drop your old rear and bolt up your new one, everything lines up with no modification. Lets say you pick up a rear off a GT for around $150 and the gears for $160 plus installation $300 it would be almost half of you estimated cost.
yes, but GT's didn't come with 3.73 did they?

plus that adds like 80lbs too
Toadster is offline   Reply With Quote
Old 05-28-2013, 05:53 PM   #5
BabyGT
5th Gear Member
 
BabyGT's Avatar
 
Join Date: Mar 2012
Location: Virginia
Posts: 2,269
Default

The gear swap will more than make up for the extra weight. You can get a gt rear for much cheaper than a limited slip for a 7.5 then you only have to buy gears and have them installed. You will save a few hundred and have a much better rear end.
BabyGT is offline   Reply With Quote
Old 06-01-2013, 03:06 PM   #6
Toadster
1st Gear Member
Thread Starter
 
Toadster's Avatar
 
Join Date: Apr 2013
Location: CA
Posts: 127
Default

man those 8.8" rears are hard to find around here... Sacramento area
Toadster is offline   Reply With Quote
Old 06-01-2013, 08:49 PM   #7
jthorn9
The Godfather
 
jthorn9's Avatar
 
Join Date: Sep 2005
Location: Temple, Texas
Posts: 15,478
Default

Ebay is your friend for those 8.8" rears.
jthorn9 is offline   Reply With Quote
Old 06-01-2013, 08:59 PM   #8
302_Mustang
1st Gear Member
 
Join Date: May 2013
Location: Delaware
Posts: 58
Default

Junkyards or Craigslist auto parts
302_Mustang is offline   Reply With Quote
Old 06-02-2013, 01:05 AM   #9
Toadster
1st Gear Member
Thread Starter
 
Toadster's Avatar
 
Join Date: Apr 2013
Location: CA
Posts: 127
Default

Quote:
Originally Posted by jthorn9 View Post
Ebay is your friend for those 8.8" rears.
cheapest ones I'm seeing are about $500 without shipping, then I'd have to do gears and installation

a local gear shop can do tlok with gears for about $700 all new
Toadster is offline   Reply With Quote
Old 06-02-2013, 07:51 PM   #10
jthorn9
The Godfather
 
jthorn9's Avatar
 
Join Date: Sep 2005
Location: Temple, Texas
Posts: 15,478
Default

Tlock in a 7.5" rear for $700 = money up in smoke = paperweight
jthorn9 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
WAZZZZUPPP wheres everyone at? uberstang1 4.6L General Discussion 62 04-17-2016 11:20 PM
Switching from 3.89 to 3.00 gears... musnicki Classic Mustang General Discussion 8 09-23-2015 07:11 AM
3.73 gears in 3.7l Darien 2005-2014 Mustangs 6 09-16-2015 09:30 AM
The Future of my GT vintageaion 2005-2014 Mustangs 2 09-08-2015 10:45 AM


Tags
3.73, differetial, gears, mileage, posi

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 09:39 PM.