The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-06-2009, 05:44 AM   #26
jim zag
ENGINE BUILDER
 
jim zag's Avatar
 
Join Date: Apr 2006
Location: Shortsville n.y.
Posts: 344
Re: Heavy Duty rear drum brakes for 1/2 tons... FYI

My 1978 G 20 van has them.
__________________
JIM ZAG
jim zag is offline   Reply With Quote
Old 06-08-2009, 09:43 AM   #27
grayw0lf
Registered User
 
Join Date: Apr 2004
Location: Clanton, AL
Posts: 1,253
Re: Heavy Duty rear drum brakes for 1/2 tons... FYI

If you search, there are some older posts on here about this swap. One post specifies the exact models & years where you can find the bigger brakes.
__________________
85' CUCV M1009!!! The newest addition!
6.2diesel, Th400, NP208, & only 36k miles!
70' C-10 LWB Fleetside - Looking good these days!
05' Dodge Neon
88' Winner Escape Sport 1750 - 4.3v6
94' Seadoo SP
84' Honda TRX200, bare nekkid. Just a frame & tires.

Always looking for another project or any good deal!

grayw0lf is offline   Reply With Quote
Old 01-24-2011, 11:31 AM   #28
N2TRUX
Happy to be here
 
N2TRUX's Avatar
 
Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,023
Re: Heavy Duty rear drum brakes for 1/2 tons... FYI

This post is now an FAQ- LINK
__________________
Follow me on Facebook and Instagram @N2trux.com

Articles-

"Jake" the 84 to 74 crewcab

"Elwood" the77_Remix

85 GMC Sierra "Scarlett"

"Refining Sierra"
N2TRUX is offline   Reply With Quote
Old 09-13-2013, 03:02 PM   #29
swissarmychainsaw
Registered User
 
Join Date: Jun 2009
Location: san francisco, ca (east bay)
Posts: 674
Thumbs up Re: Heavy Duty rear drum brakes for 1/2 tons... FYI

I was reading the RPO codes on my new-to-me Gentleman Jim and it shows:

J55 Heavy Duty Power Brakes. Some research shows:
J55 brakes use the same rear shoes as JB5 / JD5 (11 5/32" x 2 3/4").

So I think the option code (in '75 anyway) is J55.
--Nick
swissarmychainsaw is offline   Reply With Quote
Old 09-13-2013, 06:34 PM   #30
loom34432
Registered User
 
loom34432's Avatar
 
Join Date: Jun 2012
Location: Columbia, South Carolina
Posts: 59
Smile Re: Heavy Duty rear drum brakes for 1/2 tons... FYI

Another trick that you can do is, buy 2 sets of shoes and use the longer ones and not the short ones... for example use the shoe with the longer pad on the front and rear of the wheel; more breaking surface area on the drum.
__________________
72 C10 350/TH350
loom34432 is offline   Reply With Quote
Old 09-15-2013, 11:23 AM   #31
jaros44sr
Senior Member
 
jaros44sr's Avatar
 
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,704
Re: Heavy Duty rear drum brakes for 1/2 tons... FYI

Does any one know if the inside parts(wheel cylinders) change over from 2" brake parts to 2 3/4" brakes. I found the drums at NAPA, i am getting the backing plates from our classifieds
__________________
Semper Fi...Uncle Sam, you da man

All parts offered to help are free, unless otherwise noted

Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training
SAFETY FIRST

AS usual, off topic

They say your mind goes second, can't remember the first


Jim
jaros44sr is offline   Reply With Quote
Old 09-15-2013, 01:29 PM   #32
Tx Firefighter
Watch out for your cornhole !
 
Tx Firefighter's Avatar
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
Re: Heavy Duty rear drum brakes for 1/2 tons... FYI

Wow, old thread huh ? Back when I first started it I didn't even have any gray hair. How time flies. I hope some folks have gotten good out of it over the years.
Posted via Mobile Device
Tx Firefighter is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:48 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com