Booster Rod Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Draggn66 · 02-21-2007, 07:12 PM

Ok I scored a 3/4 ton booster and master cylinder on ebay and the guy didn't put the plunger rod in the box. Now he can't find it.

It's the one that goes between the booster and the MC. I don't believe the one from my 1/2 ton set-up will work so where can I get one? TIA......

Sport/Truck · 02-21-2007, 08:12 PM

How long do you think it needs to be? I have a rod in a Power break unit that wont fit my truck. Do you know how to measure what you need? I can look at mine with the MC off and tell you how to do measure it.
LMK
If it’s special I can probably make you tomorrow.
But I think the half ton will work. JMO.
s/t

Draggn66 · 02-21-2007, 08:59 PM

Quote:

Originally Posted by Sport/Truck

How long do you think it needs to be? I have a rod in a Power break unit that wont fit my truck. Do you know how to measure what you need? I can look at mine with the MC off and tell you how to do measure it.
LMK
If it’s special I can probably make you tomorrow.
But I think the half ton will work. JMO.
s/t

I'm not sure how to measure it. I think I read somewhere here that the 1/2 ton is longer. Maybe things will be a bit clearer tomorrow but right now I'm kinda stumped

Sport/Truck · 02-21-2007, 10:07 PM

I took some pictures and measurements, the rod length is 2.5 x .365 with it in the hole (it’s in the wrong way, but didn’t change the measurement) is was .250 below the surface.
I don’t know what year Chevy this was off of but it’s newer than ours.
See what you get and that should tell us what you need.
If you need a shorter one I can put mine in a lathe and turn it down for you.
LMK,
s/t

Sport/Truck · 02-24-2007, 10:18 AM

Randy, did you ever get yours measured??
LMK
s/t

Longhorn Man · 02-24-2007, 10:50 AM

the problem is, it needs to be adjustable, to make up for all the variables on the master cylinder makers. I've had to adjust that rod both times I had replaced a master cylinder on on of these boosters.
The one I have here, has a mushroomed head theat measures exactly one inch across, with a perfectly flat surface. This end goes into the booster.
Totally extended, I got 6 3/8 inches, and totally screwed in, right at 5 3/8 inches.

Draggn66 · 02-24-2007, 12:04 PM

Board member Mac measured one for me and said it's 2.486" long and .365" in diameter. The M/C end is radiused to .100" of the length but has a .125" flat in the center. Not really sure how to measure what I need when they are connected

Sport/Truck · 02-24-2007, 12:20 PM

Sounds like your 1/2 ton can be made to work pretty easily.
s/t

jimi121v · 02-24-2007, 12:57 PM

While we are on the booster subject. I have a 72 CK10, and was wondering if the dual diaphram booster from a 20 will work with all the 10 harware.(mounting brackets, push rod, mastercyl, etc.) Can I buy a new booster for a 20, and bolt it up to the 10. It has a new mastercylinder on it now.

Thanks, Jimi

02-21-2007, 07:12 PM	#1
Draggn66 Wrenchin & Sandin!!! Join Date: Aug 2006 Location: Joliet, IL. Posts: 523	Booster Rod Question Ok I scored a 3/4 ton booster and master cylinder on ebay and the guy didn't put the plunger rod in the box. Now he can't find it. It's the one that goes between the booster and the MC. I don't believe the one from my 1/2 ton set-up will work so where can I get one? TIA...... __________________ Randy Shorewood, IL. My Favorite eBay Searches My Driver Restore Thread 1971 C10 Longbed 2005 Silverado Shortbed 2005 FXDWG

02-21-2007, 08:12 PM	#2
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Booster Rod Question How long do you think it needs to be? I have a rod in a Power break unit that wont fit my truck. Do you know how to measure what you need? I can look at mine with the MC off and tell you how to do measure it. LMK If it’s special I can probably make you tomorrow. But I think the half ton will work. JMO. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-21-2007, 10:07 PM	#4
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Booster Rod Question I took some pictures and measurements, the rod length is 2.5 x .365 with it in the hole (it’s in the wrong way, but didn’t change the measurement) is was .250 below the surface. I don’t know what year Chevy this was off of but it’s newer than ours. See what you get and that should tell us what you need. If you need a shorter one I can put mine in a lathe and turn it down for you. LMK, s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. Last edited by Sport/Truck; 10-04-2007 at 08:09 PM.

02-24-2007, 10:18 AM	#5
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Booster Rod Question Randy, did you ever get yours measured?? LMK s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-24-2007, 10:50 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Booster Rod Question the problem is, it needs to be adjustable, to make up for all the variables on the master cylinder makers. I've had to adjust that rod both times I had replaced a master cylinder on on of these boosters. The one I have here, has a mushroomed head theat measures exactly one inch across, with a perfectly flat surface. This end goes into the booster. Totally extended, I got 6 3/8 inches, and totally screwed in, right at 5 3/8 inches.

02-24-2007, 12:04 PM	#7
Draggn66 Wrenchin & Sandin!!! Join Date: Aug 2006 Location: Joliet, IL. Posts: 523	Re: Booster Rod Question Board member Mac measured one for me and said it's 2.486" long and .365" in diameter. The M/C end is radiused to .100" of the length but has a .125" flat in the center. Not really sure how to measure what I need when they are connected __________________ Randy Shorewood, IL. My Favorite eBay Searches My Driver Restore Thread 1971 C10 Longbed 2005 Silverado Shortbed 2005 FXDWG

02-24-2007, 12:20 PM	#8
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Booster Rod Question Sounds like your 1/2 ton can be made to work pretty easily. s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-24-2007, 12:57 PM	#9
jimi121v Registered User Join Date: Oct 2006 Location: milwaukie, Oregon Posts: 33	Re: Booster Rod Question While we are on the booster subject. I have a 72 CK10, and was wondering if the dual diaphram booster from a 20 will work with all the 10 harware.(mounting brackets, push rod, mastercyl, etc.) Can I buy a new booster for a 20, and bolt it up to the 10. It has a new mastercylinder on it now. Thanks, Jimi



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