Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
|
07-07-2021, 08:41 AM | #1 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
|
What does this vacuum pod do?
My 85 K20 has a vacuum pod just above the brake booster. I have owned it for 7 years now and the vacuum line (going to the right) has never been hooked up to anything. I'm swapping motors and thought, now would be the time to fix it or eliminate it.
What does this do?
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
07-07-2021, 04:10 PM | #2 | |
Registered User
Join Date: Nov 2014
Location: KANSAS CITY
Posts: 100
|
Re: What does this vacuum pod do?
Quote:
|
|
07-07-2021, 05:13 PM | #3 |
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,634
|
Re: What does this vacuum pod do?
Ya know i thought it was a transmission control for the 700 but him saying it is in K20 kinda threw me off as I don't know of any 3/4 tons with that trans
|
07-08-2021, 05:33 AM | #4 |
Next!
Join Date: Jan 2003
Location: Eastern Pa.
Posts: 2,483
|
Re: What does this vacuum pod do?
I had a lite duty K20 (didn't have a full floating 8 lug rear) that had one. Apparently not very common.
__________________
86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck |
07-14-2021, 01:24 PM | #5 | |
Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,104
|
Re: What does this vacuum pod do?
Quote:
GM did install the full-float 14-bolt in the big-block c20 trucks. My theory is they assumed that combo was being purchased to tow trailers with. The larger ring gear on the full-float axle would hold up better to towing.
__________________
1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
|
07-07-2021, 05:16 PM | #6 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
|
Re: What does this vacuum pod do?
Thanks for the reponse Dan! I'll have to check the wiring to see if it is hooked up.
Where should the vacuum hose be hooked to? Currently it is hanging loose in the driver's side fender. I doubt there is any appreciable vacuum in there to help out the transmission...lol
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
07-08-2021, 08:12 AM | #7 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
|
Re: What does this vacuum pod do?
I'm sure it's a 700R4 and the fact that the switch is not hooked up to vacuum... it makes sense as the lock-up wiring at the transmission has been unhooked in the past as well (I checked last night). So, it appears that neither the wire at the transmission is connected nor the vacuum hose at the low vacuum pressure switch. Something must be up with the lockup function of the convertor/transmission.
I'm skeptical to hook it all back up, but (should I feel punchy) where should the vac hose off the switch be connected?
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
07-14-2021, 11:03 AM | #8 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
|
Re: What does this vacuum pod do?
I have decided to have the transmission rebuilt since the motor is out an also needing a rebuild. My rebuilder has commented that the transmission will overheat on a long trip without the lock-up functioning. I have made several 2 hour trips with it like this and have not burned it up, but I would like to get the lock-up working since I will end up with a rebuilt motor and transmission.
Where does the vacuum line hook to for the vacuum source?
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
07-21-2021, 05:07 PM | #9 | |
Registered User
Join Date: Nov 2014
Location: KANSAS CITY
Posts: 100
|
Re: What does this vacuum pod do?
Quote:
|
|
07-22-2021, 08:13 AM | #10 |
Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
|
Re: What does this vacuum pod do?
Thanks a million Danny! No worries about the post timing as the transmission is still in the truck, but only a couple hours away from hitting the floor and going to get rebuilt....glad your back and good to go! Thanks again, your response is appreciated.
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|