8" dual diaphragm booster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

74baggedbug · 09-20-2015, 01:46 AM

I need a 8" dual diaphragm booster for my truck.. Was wondering what vehicle came with that stock so when I go to the parts house I can order it.. The kids nowadays only know what the computer tell them.. Thanks for any info

Mike C · 09-20-2015, 11:14 AM

Because of the offset bracket and linkage that a '67-'72 uses the easiest thing to do is just buy a complete aftermarket one. I think I paid about $200 for mine on eBay with a new master cylinder.

74baggedbug · 09-20-2015, 12:21 PM

Quote:

Originally Posted by Mike C

Because of the offset bracket and linkage that a '67-'72 uses the easiest thing to do is just buy a complete aftermarket one. I think I paid about $200 for mine on eBay with a new master cylinder.

I have a wilwood master cylinder I bought and wanna run on the truck.. I'm trying to find the part locally but worst case I'll order from summit or jegs later today.. Thanks

Lattimer · 09-20-2015, 01:47 PM

Quote:

Originally Posted by 74baggedbug

I need a 8" dual diaphragm booster for my truck.. Was wondering what vehicle came with that stock so when I go to the parts house I can order it.. The kids nowadays only know what the computer tell them.. Thanks for any info

The 8" is not stock for the truck, so the regular auto parts stores won't have a clue. Best bet is to buy it from an aftermarket company. I don't know the quality, but I think CPP has them.

I bought one from Advanced auto for a 1993 C-1500. Had to modify the rod to match the original bracket setup and make up a plug to fill the hole in the master, but it works very nice. You can make any GM booster fit with some minor mods.

leftybass209 · 09-20-2015, 02:40 PM

If I understand you correctly, you're looking for an OEM parts store 8" dual diaphragm booster?

If so, as far as I know, only Mopar, and maybe some Fords ran that style of booster in an OEM application. If that holds true, it is not a bolt in application for GM. The aftermarket boosters have been modified to fit GM applications as it's just a casing and holes, the insides function the same.

You'll need to purchase an aftermarket setup for your truck.

74baggedbug · 09-20-2015, 05:58 PM

Quote:

Originally Posted by leftybass209

If I understand you correctly, you're looking for an OEM parts store 8" dual diaphragm booster?

If so, as far as I know, only Mopar, and maybe some Fords ran that style of booster in an OEM application. If that holds true, it is not a bolt in application for GM. The aftermarket boosters have been modified to fit GM applications as it's just a casing and holes, the insides function the same.

You'll need to purchase an aftermarket setup for your truck.

Yea I was looking for a oem parts store, no luck so I ordered 1 from summit and should be here Tuesday ... Thanks

69_hafton · 01-28-2016, 05:54 PM

Old thread, but Google 54-71011 for OEM reman units of the 8" dual diaphragm booster just for future reference (while they last, anyway)

Alex V. · 01-28-2016, 10:43 PM

Like this one?

IIRC late 70's Corvettes used something very close to the one in my pic. I think I had to reference the number on my old one to replace it, but it wasn't an aftermarket-only part.

lutronjim · 01-28-2016, 11:00 PM

I got one 15 or so years ago off a Chevy wrecker for my 70 C10 but never used it.

What is the benefit over regular boaster?

Thanks

Andy4639 · 01-29-2016, 09:21 AM

I bought a aftermarket chrome 8". I figured it would look good and perform well!m I do not like it at all. It feels weak compared to the old 11" one that I took off the truck.

Old setup:

New setup:

09-20-2015, 01:46 AM	#1
74baggedbug Registered User Join Date: Oct 2011 Location: Houston tx Posts: 701	8" dual diaphragm booster I need a 8" dual diaphragm booster for my truck.. Was wondering what vehicle came with that stock so when I go to the parts house I can order it.. The kids nowadays only know what the computer tell them.. Thanks for any info

09-20-2015, 11:14 AM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	Re: 8" dual diaphragm booster Because of the offset bracket and linkage that a '67-'72 uses the easiest thing to do is just buy a complete aftermarket one. I think I paid about $200 for mine on eBay with a new master cylinder. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

09-20-2015, 02:40 PM	#5
leftybass209 Registered User Join Date: Feb 2011 Location: Modesto, CA Posts: 2,189	Re: 8" dual diaphragm booster If I understand you correctly, you're looking for an OEM parts store 8" dual diaphragm booster? If so, as far as I know, only Mopar, and maybe some Fords ran that style of booster in an OEM application. If that holds true, it is not a bolt in application for GM. The aftermarket boosters have been modified to fit GM applications as it's just a casing and holes, the insides function the same. You'll need to purchase an aftermarket setup for your truck.

01-28-2016, 05:54 PM	#7
69_hafton Sleep-Deprived Join Date: Sep 2002 Location: Tulsa, Oklahoma Posts: 445	Re: 8" dual diaphragm booster Old thread, but Google 54-71011 for OEM reman units of the 8" dual diaphragm booster just for future reference (while they last, anyway) __________________ 1971 K/10 Long Fleetside 350/350 - 6" Lift 1969 C/10 SWB 292 - Sold It

01-28-2016, 10:43 PM	#8
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: 8" dual diaphragm booster Like this one? IIRC late 70's Corvettes used something very close to the one in my pic. I think I had to reference the number on my old one to replace it, but it wasn't an aftermarket-only part. __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.

01-28-2016, 11:00 PM	#9
lutronjim Registered User Join Date: Dec 2013 Location: Dunwoody,Ga Posts: 443	Re: 8" dual diaphragm booster I got one 15 or so years ago off a Chevy wrecker for my 70 C10 but never used it. What is the benefit over regular boaster? Thanks

01-29-2016, 09:21 AM	#10
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: 8" dual diaphragm booster I bought a aftermarket chrome 8". I figured it would look good and perform well!m I do not like it at all. It feels weak compared to the old 11" one that I took off the truck. Old setup: New setup: __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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