Another Gear Question

J

johnsonsinutah

New Member

Jul 26, 2008

20

0

1

May 2, 2009

#1

• May 2, 2009

• #1

Sorry to beat a dead subject...but...I have a 98 GT automatic with the four-speed transmission 4R70W. I want to put 4.10 gears in it, but I've been told if I do that with the transmission I have that I'll hit the rev limiter before I can even shift out of first gear, with the only solution being a "J-Mod". Is this correct? I had neve heard of that before.

 

J

jomull55

New Member

May 20, 2007

202

0

0

lucas, OH

May 2, 2009

#2

• May 2, 2009

• #2

i believe this is false. i had 4.10's in my 94 gt but that was an aode transmission. im pretty positive you dont have to do the jmod just to run 4.10's.

 

flstang65

10 Year Member

Dec 6, 2007

1,484

135

94

SE Georgia

May 4, 2009

#3

• May 4, 2009

• #3

You will be fine.

 

isjoining

New Member

Mar 28, 2007

143

0

0

Orlando, FL

May 4, 2009

#4

• May 4, 2009

• #4

you don't need to do a jmod or other shift kit mod in order to install 4.10

you will however need to correct your speedometer
Speedometer Recalibration Gears - '79-'98 Ford Mustang

 

J

johnsonsinutah

New Member

Jul 26, 2008

20

0

1

May 4, 2009

#5

• May 4, 2009

• #5

Thanks for the responses! I had never heard/read anything about the kind of issues noted in my post, and since I have a handheld tuner I figured I could change shift points and the rev limiter if necessary. Anyway...thanks!

 

scupking

Active Member

Sep 18, 2005

1,186

1

36

Enfield, CT

May 4, 2009

#6

• May 4, 2009

• #6

You will have no issues...