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 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-24-2007, 01:11 PM   #1
rat454
Registered User
 
Join Date: Apr 2007
Location: new mexico
Posts: 8
need help determining GM codes for master cylinder

Hi folks,

Having a bit of a problem figuring out the correct master cylinder for the power brakes on the 77 c-10 4x2 short bed....was originally a 305 automatic with air,ps,pb...

It's been "worked on" alot before we got it and we found a bunch of rigged up stuff so I don't even know if the master cylinder on it is the right one....

It has the heavy duty suspension... as it has the big shackle mounts and big springs on the back. it is a 5 lug....

When I try and look up the part I'm asked what the GM codes are on the "Service Parts Identification" sticker.;

they ask if it is a JB1, JB3, JB5

I can't find it stamped anywhere...The glove box decal is gone...

How can I find out...

Thanks,

Greg
__________________
77 C10 Short Bed Step Side 4x2 454, T-400 hugger orange, 2.71 12 bolt limited slip 496 lb ft RWT at 1550 rpm’s. 71 Camaro roller cam 454 LS6 Tremec TKO 600 5 speed 2.56 gears, berlineta t-top, New Mexico plate "RAT454" 74 Monte Carlo 95 LT1 drive train swap, full computer, 03Dodge 5.9 Turbo Diesel
Creedo:If it aint broke, it's breaking
rat454 is offline   Reply With Quote
Old 04-24-2007, 01:50 PM   #2
ElGracho
Gentleman Jim Driver
 
ElGracho's Avatar
 
Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,553
Re: need help determining GM codes for master cylinder

Are the front rotors 1" or 1.25" wide? If 1.25JB5, if 1" JB3.
__________________
Joe
'75 GMC Gentleman Jim
'84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter)
'85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans
also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed
ElGracho is offline   Reply With Quote
Old 05-13-2007, 11:54 PM   #3
rat454
Registered User
 
Join Date: Apr 2007
Location: new mexico
Posts: 8
Re: need help determining GM codes for master cylinder

Quote:
Originally Posted by ElGracho View Post
Are the front rotors 1" or 1.25" wide? If 1.25JB5, if 1" JB3.
My apologies for not posting back sooner, but the last 2 weeks of college just about killed this old fart......thank god it's over, the scenery was nice, but now it's back to work before the old lady kills me…

They are the 1.25 inch...so that makes it a JB5....

Thank you for posting back.

Greg
__________________
77 C10 Short Bed Step Side 4x2 454, T-400 hugger orange, 2.71 12 bolt limited slip 496 lb ft RWT at 1550 rpm’s. 71 Camaro roller cam 454 LS6 Tremec TKO 600 5 speed 2.56 gears, berlineta t-top, New Mexico plate "RAT454" 74 Monte Carlo 95 LT1 drive train swap, full computer, 03Dodge 5.9 Turbo Diesel
Creedo:If it aint broke, it's breaking
rat454 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 10:49 PM.


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