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Author
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Topic: Manual Shifting a C-4 "Green-Dot"
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65coupei6
Gearhead Posts: 415
From: S.F., CA
Registered: May 2000
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posted 01-28-2001 04:28 PM
   
How do you manually shift a 65-66 C4 to hold it in second longer before it shifts to third? It is a stock tranny with a 65 valve body and has a shift kit installed.
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Just Jim
Gearhead Posts: 381
From: So Cal
Registered: Feb 2000
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posted 01-28-2001 05:37 PM
Start out in 1st,shift to 2nd at desired high RPM,after trans shifts into 2nd,put shifter back in low and you can hold 2nd to desired RPM and then shift it to high.This will work if racing,but not just to hold in 2nd if not racing.Don't think the trans will be too happy,but that's how we did it in the old days.Best thing you could do is find and install a '67-'69 valve body which will let you hold it in 2nd.------------------
"Just Falcon Around"
1962 Falcon 351W
1958 Morris Minor 289
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 01-28-2001 11:42 PM
That's how you do it and the trans does not mind one bit. It doesn't know that it's not supposed to up shift when you manually put it back in low. FoMoCo engineers designed it that way.  ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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mellowyellow
Gearhead Posts: 5668
From: So. Fl.
Registered: Aug 2000
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posted 01-29-2001 07:01 AM
Wasn't one of the "real" reasons for that design was to allow one to start out in 2nd in slippery conditions?
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n2oMike
Gearhead Posts: 1547
From: Spencer, WV
Registered: Jan 2001
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posted 01-29-2001 07:50 AM
The early C4 trans has D1 and D2. Following the shifter pattern up starting in Low, it goes L, D1, D2, N, R, P. Putting the shifter in D1 starts the car out in first gear. D2 starts the car in 2nd. The owners manual states D2 is for slippery conditions where less torque to the rear wheels is desired. The manual also states that to hold the trans in 2nd gear... after it shifts to 2nd, place the shifter in Low until it's time to upshift, then place it back in Drive. My car used to be an automatic when I bought it at age 15... oh, bout' 18 years ago... and lasted that way for only one year before the 4-speed bug hit. ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
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65coupei6
Gearhead Posts: 415
From: S.F., CA
Registered: May 2000
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posted 01-29-2001 05:03 PM
Will a 67-69 valve body make that much of a difference? Is it an improvement? I don't race but there's always room for improvement.
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n2oMike
Gearhead Posts: 1547
From: Spencer, WV
Registered: Jan 2001
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posted 01-29-2001 06:34 PM
The newer valve body is just different, not necessarily an improvement. The older 64-66 valve body is actually more flexible since it allows the car the option of taking off in 2nd gear.------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 01-29-2001 11:24 PM
There is no mechanical advantage to the 67-69 valve body over the 64-66 units. The trans will still have a manual 2nd gear and shift out of second at a pre determined (according to the governer) RPM with the 67-69 unit. There are no shift kits available for the 64-66 valve bodies. ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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