Vacuum Pump delete and Hydroboost
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5th Wheeling
Joined: May 2018
Posts: 41
Likes: 3
From: Kihei, HI
Vacuum Pump delete and Hydroboost
Aloha all,
I got two questions for ya for my 1984 F250 6.9 2wd:
1. I am looking to delete my vacuum pump - I am switching to Hydroboost brakes, I don’t have any climate control (no defrost or heat or anything) so I’m removing that, and I deleted cruise control. But does the C6 AT still need vacuum to shift?
2. For the Hydroboost swap, I do not have a salvage yard available anywhere (on an island) so I have to order all parts new. I know I need the power steering pump and appropriate hoses and the Hydroboost mechanism itself, but do I need anything else? I’ve heard some talk of needing the brake pedal off of a newer truck?
mahalo for all the help, this place is invaluable
I got two questions for ya for my 1984 F250 6.9 2wd:
1. I am looking to delete my vacuum pump - I am switching to Hydroboost brakes, I don’t have any climate control (no defrost or heat or anything) so I’m removing that, and I deleted cruise control. But does the C6 AT still need vacuum to shift?
2. For the Hydroboost swap, I do not have a salvage yard available anywhere (on an island) so I have to order all parts new. I know I need the power steering pump and appropriate hoses and the Hydroboost mechanism itself, but do I need anything else? I’ve heard some talk of needing the brake pedal off of a newer truck?
mahalo for all the help, this place is invaluable
Logistics Pro
Joined: Jun 2017
Posts: 3,986
Likes: 515
From: Edmond, OK
Yes, you need to retain the vacuum pump for the C6 to shift properly. Either that or go to a cable operated modulator, which shouldn't be a problem with a 2WD truck.
https://transmissioncenter.net/shop/...vacuum-needed/
https://transmissioncenter.net/shop/...vacuum-needed/
Logistics Pro
Joined: Sep 2007
Posts: 3,739
Likes: 181
From: Western Mass
You could go to an electric vac pump, superduty trucks have them. I don't know how much vacuum the C6 needs, but I would guess the electric pump with a canister could handle it.
There is a small difference in the pedal, being where the pushrod mounts. If you have access to a welder, you could modify your existing pedal. I did that after seeing someone do it. I believe it was just removing the pin, drilling a new hole for it in the proper spot and welding it all up. It should come up in a search.
There is a small difference in the pedal, being where the pushrod mounts. If you have access to a welder, you could modify your existing pedal. I did that after seeing someone do it. I believe it was just removing the pin, drilling a new hole for it in the proper spot and welding it all up. It should come up in a search.
Mountain Pass
Joined: Oct 2021
Posts: 222
Likes: 60
Just an FYI about vacuum reservoir.
My 1990 F350 7.3 with factory air has a vacuum reservoir molded into the side of the housing in the engine compartment adjacent to the valve cover.
I had to cut it off the housing to remove the rear 2 pushrods, and will replace it with a canister.
My 1986 6.9 with cruise control had a metal canister. Dunno if it had the one on the heater housing. It burnt up in a barn fire.....
Those canisters are quite common on older cars and trucks and a trip to junkyard should yield one.
I miss the 86. It was an extended cab 4x4 with an interior that looked like an LTD and it had lived in CA desert, not a spec of rust....wood grain dash and a big bench seat for makin' love....
My 1990 F350 7.3 with factory air has a vacuum reservoir molded into the side of the housing in the engine compartment adjacent to the valve cover.
I had to cut it off the housing to remove the rear 2 pushrods, and will replace it with a canister.
My 1986 6.9 with cruise control had a metal canister. Dunno if it had the one on the heater housing. It burnt up in a barn fire.....
Those canisters are quite common on older cars and trucks and a trip to junkyard should yield one.
I miss the 86. It was an extended cab 4x4 with an interior that looked like an LTD and it had lived in CA desert, not a spec of rust....wood grain dash and a big bench seat for makin' love....
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