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Old 04-24-2007, 01:11 PM   #1
rat454
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Join Date: Apr 2007
Location: new mexico
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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
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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
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Old 04-24-2007, 01:50 PM   #2
ElGracho
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Re: need help determining GM codes for master cylinder

Are the front rotors 1" or 1.25" wide? If 1.25JB5, if 1" JB3.
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'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
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Old 05-13-2007, 11:54 PM   #3
rat454
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Location: new mexico
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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
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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
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