c4 shift points

C

C0V3R

Member

Feb 14, 2003

524

0

16

Australia

Aug 17, 2006

#1

• Aug 17, 2006

• #1

I've recently built a new engine and put new seals and vac modulator through the c4 box. I am finding that the gearbox is shifting at really low RPM's at WOT (~3800) which is very dissappointing considering that the roller 5.0 with trick flows will just be starting to get down to business at this point.

Is there any way I can change when the box shifts up? Is it possible to get it up to 5000-5500 rpms without a shift kit?

 

geostang351

Member

Mar 30, 2005

946

0

17

Danb., CT

Aug 17, 2006

#2

• Aug 17, 2006

• #2

I can't remember the C4 too much, but isn't there a direct linkage from the throttle (pedal linkage) to the C4 kickdown that would keep the RPM's up at WOT?

 

geostang351

Member

Mar 30, 2005

946

0

17

Danb., CT

Aug 17, 2006

#3

• Aug 17, 2006

• #3

Try this website at Mustangs unlimited. DO you have this?

http://mustangsunlimited.com/itemdy01.asp?T1=7A187D+01&Category=&catkey=EMUSTANG

 

M

mustangdave

My rearend needs a stud and two nuts.

Founding Member

Feb 26, 2002

2,976

1

56

North Carolina

Aug 17, 2006

#4

• Aug 17, 2006

• #4

Undo the vacuum line at the modulator valve. Hopefully, there is a place for a flathead screwdriver in there. Turning this will change your shift points.

 

jb1dsl

Member

May 24, 2004

566

0

17

Marianna, Fl.

Aug 17, 2006

#5

• Aug 17, 2006

• #5

turn which adjusts it up or down?

 

Cobain03

Active Member

Aug 27, 2003

996

0

36

Lexington, Ky

Aug 18, 2006

#6

• Aug 18, 2006

• #6

from a stand still, mine shifts at around 4 into 2nd and about 4100 into 3rd