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Deuce03
06-06-2009, 11:47 PM
1989 GT, recently purchased, not much of a gear head, but am diving in head first and want to try and learn as much as I can.

When I turn left and smash it, the car will go sideways, but when I am making a right and smash it, only the right wheel spins. I was also told that the car has 3.73's

My first of many questions for you guys is:

If this was a posi car this should not do this right?

Second: If the car does have 3.73's what rpm should I expect to see at 70mph in 5th gear?

I am also looking to go to a 4.10 gear. how hard is it to install a posi, (if not installed) and the gears? That is all the questions for one night many more to come. Hoping not to be a pain in the A$*.

Thanks,
Neil

1989 Mustang gt

List of current mods to car:

BBK longtube headers,
BBK Off-road X-pipe,
Flomaster Cat-back,
BBK Cold air intake,
BBK 70mm Throttle body/EGR spacer,
MSD 6A Ignition box,
AutoMeter monster Tach,
Pro5.0 short throw,
Flex-Lite electric fan,
UPR Underdrive pullies,
2 inch drop springs,
UPR Sub-frame connectors(Welded)
17 inch Cobra wheels
Centerforce Clutch
T-5 trans
Shorty429
06-06-2009, 11:50 PM
Welcome to SCS! There's a lot of knowledgeable guys on here who can answer all your questions. You've came to the right place:thmbsup:
PaxtonShelby
06-07-2009, 12:25 AM
Hi and welcome!

All fox GT's and 5.0 LX cars had traction-lock rear ends, so it sounds like the clutches are worn out in your differential. Some of the guys on SCS have their own shops and can handle the rebuild / gear swap for you. I know Timmy Rodeheaver does this quite a bit, and I can vouch for his work, as he has done a few things on my '66 and cars owned by people I know. :goodidea:

I have 4.10's in my '90 LX and for daily driving it is a bit much. I'd actually prefer 3.73's or 3.55's in my car, which is only lightly modified ( cam, headers, exhaust, ignition, etc. ). Luckily, my commute to work is less than 7 miles, so it isn't so bad. However, I do have to admit that my 3-year old daughter really likes how the car pulls in all gears with the 4.10's!!!!! Of course, she doesn't have to pay the gas bill every month either...

Anyway, good to have you aboard. Now...get some pics posted of your ride! :hyper:
92306gt
06-07-2009, 12:59 AM
welcome...sounds like its time for new clutches in the rear. pretty easy job you can do yourself
94svtcobra
06-07-2009, 01:40 AM
welcome
AdamantiumSilvr
06-07-2009, 04:08 AM
Hello there!?
Wolfpack Speed
06-07-2009, 09:40 AM
Welcome!!!
INSANELY CRAZY
06-07-2009, 10:49 AM
welcome.


unless your gonna use it for track only id stay with 373's. defiantly sounds like clutches are out. if you have never opened up a rearend and arent mechanically inclined i would have a shop do it.
John4cam
06-07-2009, 02:30 PM
welcome
412mustangz
06-08-2009, 01:33 AM
Welcome 2 the site
1Badbird
06-08-2009, 11:06 AM
Welcome!!
Rodeheaver's
06-08-2009, 11:11 AM
welcome.. it does sound like you could use a posi rebuild..
scott5
06-08-2009, 06:36 PM
welcome
RAYZ02GT&93LX
06-08-2009, 09:35 PM
Hello and welcome to the site.
04svtzx3
06-09-2009, 04:24 AM
welcome
shawnsvtcobra
06-09-2009, 10:09 AM
Welcome to SCS.
MBH
06-18-2009, 12:58 PM
Welcome, Neil!