Carb change.
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Freshman User
Joined: Mar 2001
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Carb change.
Hi all,
I've just changed the old Holley 4bbl for a new Carter 4bbl. I put the vacuum lines that were on the Holley right onto the Carter. Everything seems fine except the transmission now downshifts when the engine revs fall. Should the vacuum line to the transmission be connected somewhere else or is there some other fix I could try? 390/C6.
I've just changed the old Holley 4bbl for a new Carter 4bbl. I put the vacuum lines that were on the Holley right onto the Carter. Everything seems fine except the transmission now downshifts when the engine revs fall. Should the vacuum line to the transmission be connected somewhere else or is there some other fix I could try? 390/C6.
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
Carb change.
Mine connects to the rear of the intake manifold.
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Carb change.
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Do you have a Vacuum tree on the back of the intake manifold, with about 4-5 outlets with a few rubber plugs on them ?
That's where you connect the transmission vacuum line to.
Not the bottom of the carb !
Dennis
78 F-150 429CJ 465,000 KM.(Original Owner)
68 Mustang 289 Sunlit Gold 80,000 Miles(second Owner)
64 1/2,260 Pre-World's Fair Mustang #8092
64 Fairlane 500 S/C,waiting for a 390 4-Spd
If The Girls Don't Find You Handsome,
They Should At Least Find You Handy!
Do you have a Vacuum tree on the back of the intake manifold, with about 4-5 outlets with a few rubber plugs on them ?
That's where you connect the transmission vacuum line to.
Not the bottom of the carb !
Dennis
78 F-150 429CJ 465,000 KM.(Original Owner)
68 Mustang 289 Sunlit Gold 80,000 Miles(second Owner)
64 1/2,260 Pre-World's Fair Mustang #8092
64 Fairlane 500 S/C,waiting for a 390 4-Spd
If The Girls Don't Find You Handsome,
They Should At Least Find You Handy!
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Carb change.
[font size="1" color="#FF0000"]LAST EDITED ON 28-Oct-01 AT 05:36 PM (EST)[/font][p]https://www.ford-trucks.com/dcforum/User_files/mil1ion/3bdc6db8425ac274.gif
Look for a threaded hole about 5/8-3/4 " at the Right rear of the intake.
Or look for a Plug with a square top for a wrench or a recessed square hole that an extension from a socket set could be used to remove.
It normally takes a Vacuum tree with 4-5 outlets.
Dennis
78 F-150 429CJ 465,000 KM.(Original Owner)
68 Mustang 289 Sunlit Gold 80,000 Miles(second Owner)
64 1/2,260 Pre-World's Fair Mustang #8092
64 Fairlane 500 S/C,waiting for a 390 4-Spd
If The Girls Don't Find You Handsome,
They Should At Least Find You Handy!
Look for a threaded hole about 5/8-3/4 " at the Right rear of the intake.
Or look for a Plug with a square top for a wrench or a recessed square hole that an extension from a socket set could be used to remove.
It normally takes a Vacuum tree with 4-5 outlets.
Dennis
78 F-150 429CJ 465,000 KM.(Original Owner)
68 Mustang 289 Sunlit Gold 80,000 Miles(second Owner)
64 1/2,260 Pre-World's Fair Mustang #8092
64 Fairlane 500 S/C,waiting for a 390 4-Spd
If The Girls Don't Find You Handsome,
They Should At Least Find You Handy!
Senior User
Joined: Apr 2000
Posts: 240
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From: Ozarks
Carb change.
Everything seems fine except the transmission now downshifts when the engine revs fall. Should the vacuum line to the transmission be connected somewhere else or is there some other fix I could try? 390/C6.
If he's using full manifold vacuum already, why would it make a difference whether he gets it off the "tree" or from the large port beneath the throttle blades?
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Carb change.
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As it was explained to me many moons ago.
DON'T hook up accessories near the carburetor.
Accessories ie:brake booster,transmissions,cruise control.
These can run off a seperate vacuum outlet.
Distributor's get the, near the carb, vacuum.
Dennis
78 F-150 429CJ 465,000 KM.(Original Owner)
68 Mustang 289 Sunlit Gold 80,000 Miles(second Owner)
64 1/2,260 Pre-World's Fair Mustang #8092
64 Fairlane 500 S/C,waiting for a 390 4-Spd
If The Girls Don't Find You Handsome,
They Should At Least Find You Handy!
As it was explained to me many moons ago.
DON'T hook up accessories near the carburetor.
Accessories ie:brake booster,transmissions,cruise control.
These can run off a seperate vacuum outlet.
Distributor's get the, near the carb, vacuum.
Dennis
78 F-150 429CJ 465,000 KM.(Original Owner)
68 Mustang 289 Sunlit Gold 80,000 Miles(second Owner)
64 1/2,260 Pre-World's Fair Mustang #8092
64 Fairlane 500 S/C,waiting for a 390 4-Spd
If The Girls Don't Find You Handsome,
They Should At Least Find You Handy!
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Thread Starter
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Freshman User
Joined: Mar 2001
Posts: 35
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Carb change.
As it turns out, I had the distributor and trans vacuum lines on the wrong ports on the carb. One of them is timed vacuum and one is manifold vacuum. It now runs like the beautiful piece of machinery that it is. Thanks for everyone's help.
Don
Don
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