Someone give me a straight answer

apats77

Member

May 2, 2011

178

1

18

Watertown, MA

Feb 10, 2012

#1

• Feb 10, 2012

• #1

With my 1998 GT 5 speed, I swap the rear end gears out from 2.73's to 3.73's. I have been all over the Internet and still have no idea what works and what doesn't. For speed correction I have read that people use an SCT tuner, the speedcal from brothers, and changing the small plastic gear.

What works and what doesn't!

 

N8Dogg98

15 Year Member

Apr 4, 2005

3,872

238

184

MN

Feb 10, 2012

#2

• Feb 10, 2012

• #2

I installed 3.73's and bought a speedcal. Works perfectly You cannot correct the rear gear ratio using a handheld tuner in the 1998 Mustang.

You can also replace the small plastic gear, but for some reason I recall people saying that these gears are prone to failure if replaced. The speedcal works well, and if you ever change gears or wheel +tire diameter in the future it is really easy to update the speedcal to compensate for it.

 

Reactions: apats77

mustangman9812

10 Year Member

Jan 14, 2004

661

6

49

Mars Hill, NC

Feb 10, 2012

#3

• Feb 10, 2012

• #3

In the 98 GT I had i just bought the correct speedogear from Mustangs Unlimited and it was fine.

 

apats77

Member

May 2, 2011

178

1

18

Watertown, MA

Feb 10, 2012

#4

• Feb 10, 2012

• #4

Can always count on

 

vertigasen

Active Member

Apr 28, 2004

366

18

29

Falcon, CO

Feb 11, 2012

#5

• Feb 11, 2012

• #5

Yep, either way works....the gear or the speedcal. Im with N8Dogg98 here, the speedcal will allow you to add tire size whenever you want.

 

mustangman9812

10 Year Member

Jan 14, 2004

661

6

49

Mars Hill, NC

Feb 11, 2012

#6

• Feb 11, 2012

• #6

vertigasen said:

Yep, either way works....the gear or the speedcal. Im with N8Dogg98 here, the speedcal will allow you to add tire size whenever you want.

Click to expand...

Even though i got the speedo gear i would prob go to speedcal route if i was to do it over, the speedo was still off about 2-3 mph with the gear