Can you identify. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

eightbanger · 08-20-2008, 11:48 AM

I realise that this is the vacum hose which runs from the the Trany to the engine but what is the Gold coloured thing in the pic that the hose attaches to? and it seems to be sucking Trans fluid up the hose, is that a problem?.

syncrov69 · 08-20-2008, 12:01 PM

I think that's your transmission modulator!

70inline6 · 08-20-2008, 12:02 PM

Yes - the diaphram has failed in the modulator.

$20 from jegs - you can probably find it cheaper.

http://www.jegs.com/p/B&M/748052/10002/-1/10739

66chevy PROSTREET · 08-20-2008, 12:44 PM

Quote:

Originally Posted by 70inline6

Yes - the diaphram has failed in the modulator.

$20 from jegs - you can probably find it cheaper.

http://www.jegs.com/p/B&M/748052/10002/-1/10739

x2- that affects when the tranny shifts, simple to change,

i would say thats a problem

Myself · 08-20-2008, 01:40 PM

Yes, the inner rubber diaphram has failed. You can pick up an adjustable one at your local auto parts store for about $12. Just tell them you want an adjustable vacuum modulator for a Turbo 350.

Longhorn Man · 08-20-2008, 03:15 PM

I would replace it with the quickness too. It is probably sucking fluid right into the engine. While that'll help clean the valves and not harm the engine... it'll drop the level of the tranny, which if you just wait for the tranny to slip, then damage is already done. Granted, it's minimal damage, but over and over again will add up.

70inline6 · 08-20-2008, 03:28 PM

Quote:

Originally Posted by Myself

...You can pick up an adjustable one at your local auto parts store for about $12. Just tell them you want an adjustable vacuum modulator for a Turbo 350.

Not sure they'll have them at the Rover or Jaguar Parts Pro... His sig says TH400 is the reason I pointed him to Jegs.

In any event... I agree with Longhorn too... low fluid behind a BB... bad! x2

eightbanger · 08-20-2008, 04:26 PM

Thanks very much you guys for all your help and replies, now at least I know what to ask for when I go parts shopping...hope it's not done to much damage already. Wes at Classic Heartbeat should have that Modulator thingy, wished I did have a local parts store like you guys

Thanks again. I would be lost without you all and this forum.

Longhorn Man · 08-20-2008, 10:44 PM

ANY parts store can get one
ewwwww, just looked at your location. Nevermind. I guess this isn't as easy as seinging by the local NAPA huh?
you could call around maybe? You might get lucky?

08-20-2008, 11:48 AM	#1
eightbanger 454 MAKES IT ROAR Join Date: Jan 2008 Location: Essex, U.K Posts: 2,701	Can you identify. I realise that this is the vacum hose which runs from the the Trany to the engine but what is the Gold coloured thing in the pic that the hose attaches to? and it seems to be sucking Trans fluid up the hose, is that a problem?. __________________ Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger

08-20-2008, 12:01 PM	#2
syncrov69 Registered User Join Date: Aug 2007 Location: Laval, Québec, Canada Posts: 175	Re: Can you identify. I think that's your transmission modulator! __________________ '71 Custom/10 Deluxe LWB '71 Custom/30 Deluxe Dually

08-20-2008, 12:02 PM	#3
70inline6 Registered User Join Date: Jan 2008 Location: Pell City, AL Posts: 255	Re: Can you identify. Yes - the diaphram has failed in the modulator. $20 from jegs - you can probably find it cheaper. http://www.jegs.com/p/B&M/748052/10002/-1/10739 Last edited by 70inline6; 08-20-2008 at 12:05 PM.

08-20-2008, 01:40 PM	#5
Myself Registered User Join Date: Oct 2005 Location: Northern Arkansas Posts: 1,136	Re: Can you identify. Yes, the inner rubber diaphram has failed. You can pick up an adjustable one at your local auto parts store for about $12. Just tell them you want an adjustable vacuum modulator for a Turbo 350.

08-20-2008, 03:15 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Can you identify. I would replace it with the quickness too. It is probably sucking fluid right into the engine. While that'll help clean the valves and not harm the engine... it'll drop the level of the tranny, which if you just wait for the tranny to slip, then damage is already done. Granted, it's minimal damage, but over and over again will add up.

08-20-2008, 04:26 PM	#8
eightbanger 454 MAKES IT ROAR Join Date: Jan 2008 Location: Essex, U.K Posts: 2,701	Re: Can you identify. Thanks very much you guys for all your help and replies, now at least I know what to ask for when I go parts shopping...hope it's not done to much damage already. Wes at Classic Heartbeat should have that Modulator thingy, wished I did have a local parts store like you guys Thanks again. I would be lost without you all and this forum. __________________ Nigel. An American living in a British body. 1971 Chevy Cheyenne 10 454 "In a time of universal deceit, telling the truth becomes a revolutionary act." - George Orwell "When injustice becomes law, resistance becomes duty" - Thomas Jefferson No more pain. 03.12.60 -- 12.28.10 http://www.youtube.com/Eightbanger Last edited by eightbanger; 08-20-2008 at 04:28 PM.

08-20-2008, 10:44 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Can you identify. ANY parts store can get one ewwwww, just looked at your location. Nevermind. I guess this isn't as easy as seinging by the local NAPA huh? you could call around maybe? You might get lucky?



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