Gears, Gears, Gears

[Ferocious]

The time has finally come for me to start putting money together so i can get a new set of gears.
But first i have a few questions.

My car is a 96 GT Auto, 110,xxx miles, stock rear end.
I will be slapping on a vortech kit in the future, so yes i will be running boost.

1. Should i go with 3:73's or 4:10's?
2. Do i need to purchase the installation/bearing kit? (http://www.americanmuscle.com/rearendrebuild.html)
3. How would i go about adjusting my speedometer? Do i get a speed calibrator? (http://www.americanmuscle.com/speed-calibrator-94-04.html)
4. Are there any other parts that i will need to complete the install?

Thanks.

 

[sleepn_sn95]

How much highway driving do you do?

 

[g36 monkey]

Since you are boosting I say 3.73.

You will need the speed cal if you care about the speedometer being off.

I would get a rebuild kit. No point ripping apart a rear end and not giving it a little refresh.

 

[mygreengt]

Since you are boosting I say 3.73.

You will need the speed cal if you care about the speedometer being off.

I would get a rebuild kit. No point ripping apart a rear end and not giving it a little refresh.

what this guy said.

 

[Ferocious]

How much highway driving do you do?

A couple times a month. I'd say most of my driving is city.

Since you are boosting I say 3.73.

You will need the speed cal if you care about the speedometer being off.

I would get a rebuild kit. No point ripping apart a rear end and not giving it a little refresh.

Ok. And how does the speedcal actually work? Does it plug into the car's computer and re-adjust the speedo and shift points?
& I noticed steeda & AM stopped selling it. Any clue as to who still does?

 

[sleepn_sn95]

i agree with them. 3.73's and a rebuild kit

 

[g36 monkey]

Hmmm, I am actually unsure of how it works, though I would imagine it has to do with the OBDII port. I was always told that the SCT tuners only worked on the speedo for 98+ cars.


I am unsure of who sells them.

 

[Musturd]

Replace ur posi clutches as well

 

[Ferocious]

LMR still sells the speedcal apparently.
http://www.latemodelrestoration.com/item/M4209ADPTA/94-2010-Mustang-Ford-Racing-Speedometer-Adjuster-Calibrator

Anyone know how it works or how to install it?

 

[chris91]

I ran 4.10's in my Vortech'd Auto 94 and it ripped. The auto's like taller gears. Was perfectly fine on the highway also. Never fear the gear!

 

[justinschmidt1]

If your auto either gear will be fine, however know that with a 26 inch tall tire and 4.10s you will run out of gear at like 110 mph lol.

I have 3.73s with my setup and they are perfect

 

[forcefedhatch]

I have the factory 3.27 with a 28" tire, but mines turbo


Sent from my iPhone

 

[jo4roush99]

My 96 GT had 4:10's and 70 mph on the interstate was 2900 rpms. My Cobra has 3.73's and 70 mph is about 2550 rpm's.
The 4.10's will have better take off, but the 3.73's seem like a good middle point between take off power and top end power.

 

[lilj4u2njoy]

I have 3:55's great all around gear... Street, track, whatever

Sent from my PG86100 using Tapatalk

 

[Venomized]

i would go 3.73s and get the complete rebuild kit and like kyle stated get the posi rebuild kit as well. Thats what I am doing

 

[joekd]

Speedcal connects between the existing speed sensor on the tranny to the computer itself, it pretty much just takes the signal and changes the multiplier so the car reads the correct speed

Here's a good install guide http://www.americanmuscle.com/speed-cal-install.html

I am doing my car's gears soon and got the gears, traclok rebuild, install kit with seals, speedcal and of course new fluid

 

[justinschmidt1]

My 96 GT had 4:10's and 70 mph on the interstate was 2900 rpms. My Cobra has 3.73's and 70 mph is about 2550 rpm's.
The 4.10's will have better take off, but the 3.73's seem like a good middle point between take off power and top end power.

That better take off is worthless if all your doing is spinning though.....

4.10s are fine NA, but add some boost and it becomes a spin fest

 

[Ferocious]

What exactly is this 'posi rebuild' you guys are talking about?
And i think i'm pretty set on getting 3:73s now. If i ever do end up using the highway to go to work, i'm sure i'll be glad i settled with 3:73s.
4:10's seems like theyre gonna spin too much once my car begins to make power.

 

[justinschmidt1]

Trak lok rebuild kit

http://www.americanmuscle.com/ford-...ium=Shopping&AMID=ford-88-traclok-kit-2009-GT

 

[Ferocious]

Trak lok rebuild kit

How crucial is the rebuild kit when swapping out gears? If my budget allows it, i will most likely look into it.
I'd love more info on what it does exactly though.