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Author
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Topic: C-4 doesn't downshift to 1st
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SugarlandStang
Journeyman Posts: 26
From: Sugar Land, TX
Registered: Dec 2005
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posted 05-04-2006 08:00 PM
   
I have a C-4 transmission in a 67 that doesn't want to downshift to first. It usually takes off in 2nd. I was wondering if there was a few simple things that I could try to fix it. I am not qualified to open the transmission up, so don't bother recommending anything that requires opening the tranny. It will manually shift into first no problem. Idle is about 700 rpm. Fluid level is OK. A B&M shift kit is installed. Thanks.
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adragon8u
Gearhead Posts: 5575
From: Oceano, Ca. member# 2895
Registered: Mar 2003
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posted 05-04-2006 08:26 PM
does yours have the green dot on the shifter? if so, then that's the gear you need to be in for it to start out in first. If you put it in drive, it'll start off in second and will only drop to second. I think it's for driving in wet or snowy conditions so you don't spin the tires on take offs.------------------
"Be yourself
everyone else is taken"
http://mustangsandmore.50megs.com/MembersPics/adragon8u.html
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SugarlandStang
Journeyman Posts: 26
From: Sugar Land, TX
Registered: Dec 2005
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posted 05-04-2006 10:54 PM
I don't have a green dot on my shifter. I have the center console with the lighted shift indicator. P R N D 2 1.------------------
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adragon8u
Gearhead Posts: 5575
From: Oceano, Ca. member# 2895
Registered: Mar 2003
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posted 05-04-2006 10:57 PM
mmm, my next guess would be the vacuum modulator? ------------------
"Be yourself
everyone else is taken"
http://mustangsandmore.50megs.com/MembersPics/adragon8u.html
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indyphil
Gearhead Posts: 2842
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 05-05-2006 08:30 AM
When I ran with my Vacuum modulator disconected it just gets stuck in the lower gears. So connected or not, it should be in first gear. I dont think its the Vacuum modulator. Sounds like a valve body problem?------------------
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69 Sportsroof
Gearhead Posts: 2513
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 05-05-2006 10:42 AM
Still sounds like a green dot transmission. Try putting the gear selector at 2 and see what happens. Regardless of your shifter indiator, a green dot transmission selector goes P R N 2 D L. You'll only get the 1-2-3 shift if the selector is in the correct drive position which is where you'd normally see 2.
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Jake11
Gearhead Posts: 228
From: Banning,Ca,USA
Registered: Oct 2005
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posted 05-05-2006 05:11 PM
If its a 66 valve body, it will start off in
2nd. If it's a 67 VB, it should start in first. Are you sure what its got in it. I
had this happen to me too. I had a 67 that
the PO had put a 66 trans in. The 67 VB will
fit your C4.
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Moneymaker
Administrator Posts: 28315
From: Lyons, IL, USA
Registered: May 99
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posted 05-05-2006 08:11 PM
If you put it in "1" will it take off in first gear?------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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SugarlandStang
Journeyman Posts: 26
From: Sugar Land, TX
Registered: Dec 2005
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posted 05-05-2006 08:30 PM
If I put it in "1" it starts in 1st gear and stays in 1st. If I put it in "2" it starts in 2nd gear and stays in 2nd gear. If I put it in "D", it starts in 2nd and will shift to 3rd.
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Jake11
Gearhead Posts: 228
From: Banning,Ca,USA
Registered: Oct 2005
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posted 05-05-2006 10:42 PM
Then the band is staying applied in drive.
Maybee a crossleak in the spacer plate GSK.
I would use a pressure guage to ck it out.
May have a valve sticking in the VB. 2nd
shift valve.
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Moneymaker
Administrator Posts: 28315
From: Lyons, IL, USA
Registered: May 99
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posted 05-05-2006 11:22 PM
Could be a sticky governer.
One easy trick to try and cure.
Take off in fist gear slowly and manually shift into second, then third.
Coast down to about 5 MPH then pop into reverse and then stop.
Then try drive and see if low will engage.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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69 Sportsroof
Gearhead Posts: 2513
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 05-06-2006 11:09 AM
quote:
Originally posted by Moneymaker:
Coast down to about 5 MPH then pop into reverse and then stop.
I've got to say that if anyone else in the world suggested doing that I'd poke them in the eyes a' la the 3 stooges. 
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blackford
Journeyman Posts: 53
From: Corona, Ca
Registered: Jan 2004
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posted 05-06-2006 03:11 PM
Most likely its the governer. Not an uncommon problem with old C4s. Dirt in trans fluid will cause it. It's located around the output shaft inside the extension housing. You can clean it or replace it without too much work. [This message has been edited by blackford (edited 05-06-2006).]
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Jake11
Gearhead Posts: 228
From: Banning,Ca,USA
Registered: Oct 2005
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posted 05-06-2006 04:52 PM
That should slam a stuck gov. loose!
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Moneymaker
Administrator Posts: 28315
From: Lyons, IL, USA
Registered: May 99
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posted 05-06-2006 07:29 PM
Works for me every time guys. 
(if it is a stuck or clogged governer that is)------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/SRA member and licensed Superstock driver
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,'04 &'05
First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
First SS/MA in the TENS 04-03
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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SugarlandStang
Journeyman Posts: 26
From: Sugar Land, TX
Registered: Dec 2005
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posted 05-06-2006 11:15 PM
quote:
Take off in fist gear slowly and manually shift into second, then third.
Coast down to about 5 MPH then pop into reverse and then stop.
Then try drive and see if low will engage.
[/B]
I'll try it tomorrow. I wanted to try it today, but my wife had me putting up solar screens on the back windows of the house. It's taken all day and night...
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SugarlandStang
Journeyman Posts: 26
From: Sugar Land, TX
Registered: Dec 2005
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posted 05-07-2006 10:36 PM
Yep, worked like a charm! Thanks alot! I love this web site.
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66bluefb
Gearhead Posts: 530
From: Okla.City,Okla.
Registered: May 2002
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posted 05-10-2006 07:24 PM
Thanks Moneymaker.I had the same problem and did what you said and now mine is downshifting every time.You are the MAN!!------------------
http://ourworld.cs.com/blagintony/myhomepage/auto.html
86-302 HO bored .030 over crank .010 under,
B-303 cam ,harland sharp roller rockers,
performer rpm intake, 625 carter,AFR 165 heads.C-4 2500 stall
,granada disc brakes, 85 duraspark ignition, pony interior,the who,the doors,and ccr full blast on the stereo
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johnmustang
Gearhead Posts: 6405
From: British Columbia , Canada
Registered: Nov 2001
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posted 05-10-2006 07:30 PM
quote:
Originally posted by Moneymaker:
Could be a sticky governer.
One easy trick to try and cure.
Take off in fist gear slowly and manually shift into second, then third.
Coast down to about 5 MPH then pop into reverse and then stop.
Then try drive and see if low will engage.
Alex, Will this work with a green dot? ------------------
JOHN
65 FASTBACK 2+2
87 TAURUS WAGON
03 F150 XLT SUPER CREW 4X4 SHORT BOX
Member: PACIFIC COAST MUSTANG ASSOCIATION
Member:Vancouver Island Mustang Association
M&M #1710
65 FASTBACK
2003 F150 XLT SUPER CREW 4X4
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