C6 shift modulator vacuum source?
Thread Starter
|
Senior User
Joined: Mar 2015
Posts: 231
Likes: 1
From: Seligman, AZ
C6 shift modulator vacuum source?
I haven't found any sources in Google so I was hoping someone here might know. Anyone know which port to use for the shift modulator on the Holley carbs? I have one that is full vac, but I'm not sure if that is the right one to use and the others are used or labeled for something else.
Thanks
Thanks
Thread Starter
|
Senior User
Joined: Mar 2015
Posts: 231
Likes: 1
From: Seligman, AZ
I finally found someone on 460ford that had a similar problem and it looks like they said that you can hook it up to a manifold vac source, which should mean full vac on the carb. Anyone have any info to confirm or dispute this? TIA
Logistics Pro
Joined: Oct 2014
Posts: 3,677
Likes: 172
Trending Topics
Laughing Gas
Joined: Sep 2004
Posts: 1,057
Likes: 3
From: gravel road ONTARIO
wow everybody is on sunday nite, almost 3 posts stacked onto the same minute. I think we have the answer. 
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
Thread Starter
|
Senior User
Joined: Mar 2015
Posts: 231
Likes: 1
From: Seligman, AZ
Well the problem is that the Holley's rear fuel bowl partially covers the manifold vacuum port on the Edelbrock, so I'm going to have to use the carb since the OEM vacuum tree is too tall, has too many ports, and I'm too broke to get vacuum plugs or a new port. If it requires full vacuum then there should be no reason that I can't hook it up to the full vacuum port on the Holley which I think is the same size vacuum port as the shift modulator. I'll update when I get it hooked up.
Elder User
Joined: Jul 2015
Posts: 730
Likes: 0
Well, that is odd. I have an edelbrock performer intake on 84 with 351 and Holley 600 and there is tons of room behind the carb for the vacuum tee. From that vacuum tree runs my vacuum booster for brakes and line to my C-6 automatic. And another line than runs to some vacuum thing under the brake master cylinder, best I recall. I'd think any port on the Holley is ported vacuum and not full manifold vacuum therefore your vacuum modulator valve on trans will see differing vacuums and perform erratically? Do you have a spacer plate under you Holley that has a vacuum port plug on it that you could use maybe?
New User
Joined: Nov 2015
Posts: 3
Likes: 0
From: Tucson, AZ
I haven't found any sources in Google so I was hoping someone here might know. Anyone know which port to use for the shift modulator on the Holley carbs? I have one that is full vac, but I'm not sure if that is the right one to use and the others are used or labeled for something else.
Thanks
Thanks
Regards, Billdarrp { margin-bottom: 0.1in; line-height: 120%; }
Thread Starter
|
Senior User
Joined: Mar 2015
Posts: 231
Likes: 1
From: Seligman, AZ
Thanks for the suggestions guys! Hooked up the vac line to the full manifold vacuum port on the Holley and it shifted like normal.
Last edited by mos68x; Dec 9, 2015 at 09:54 AM. Reason: Wrong thread
