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02-20-2012, 05:39 PM
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#1 |
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Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Can u tell from vin if a truck has 1" or 1.25" rotor?
see above
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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02-20-2012, 06:47 PM
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#2 |
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Garage wrench
Join Date: Feb 2008
Location: LaCrosse, WI
Posts: 1,855
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
no sir
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-Adam 90 V1500 GMC Suburban 350/700R4/NP241..... 01 Saturn SL1 stock DD..... |
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02-20-2012, 07:02 PM
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#3 |
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Registered User
Join Date: Oct 2011
Location: hudson,wi
Posts: 805
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
Pull the wheel off and measure outside to outside of the rotor. You'll know right away.
RIZ |
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02-20-2012, 09:43 PM
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#4 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
Check the RPO codes. Heavy Halfs, fleet trucks and special orders had them.
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02-21-2012, 12:14 PM
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#5 |
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Registered User
 
Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
My 87 is a "Heavy Half" with 1.25" Rotors.
It has two RPO codes , "JB5" and "J55" JB5 Brake System: Power, Front Disc, Rear Drum, 6400 Lbs. JB5 BRAKE POWER, DISC/DRUM, 6,400 LBS J55 BRAKE SYSTEM HEAVY DUTY Desert |
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02-21-2012, 01:35 PM
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#6 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,237
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
Quote:
K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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02-21-2012, 05:39 PM
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#7 | |
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Registered User
Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
Quote:
JB3 BRAKE POWER, DISC/DRUM, 4,600 LBS Dez |
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02-22-2012, 08:14 AM
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#8 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,237
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
Quote:
I know there was a manual system available as well, JB1 perhaps? It just occured to me that, during our recent move, I found the actual component charts that we use/used to release the specific brake hardware for the various systems - from 1979 or so. I'll see if I can find it again and post it up. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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02-21-2012, 01:18 PM
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#9 |
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67-72 parts collector,…
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,702
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
The best way is to measure.
I had an '86 with the HD rotors and an '83 with the light duty rotors. I'm not sure what GM was thinking. I know all the 71-72 front ends are 1-1/4". I think all the 73-80 front ends are also 1-1/4". 81-87 is anybody's guess,...
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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02-21-2012, 02:57 PM
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#10 |
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Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
I will pull the wheel and check it out. I was in front of the computer at work and was trying to figure it out.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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02-22-2012, 09:55 AM
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#11 |
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6.0 powered square
Join Date: Feb 2008
Location: Mesquite texas
Posts: 3,459
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
my 80 big 10 had 1" rotors that some one swap in, but it now has 1.25 rotors front and rear
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Aaron 1980 c-10 short bed lowered, cammed 6.0, 4l80e 3600 stall, smp tune, wilwoods, and flames best time so far best et 7.86 @87 on motor 7.57 90 on a 75 shot Build http://67-72chevytrucks.com/vboard/s...d.php?t=283326 |
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02-22-2012, 10:23 AM
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#12 |
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C35 Crew Dually
Join Date: Nov 2008
Location: Belleville Ontario
Posts: 1,116
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
off topic but kinda the same but I went to order front pads for my CC dually and they asked me what size my rear breaks were? the sizes were 13.2 1/2 or 13.3 1/2 where do i measure?
sorry for the thread jack
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If it aint square, I don't care. 84 C35 CC Dually Project log... http://67-72chevytrucks.com/vboard/s...d.php?t=414892 |
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02-23-2012, 11:28 PM
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#13 |
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Registered User
Join Date: Jan 2006
Location: Garland, TX
Posts: 970
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Re: Can u tell from vin if a truck has 1" or 1.25" rotor?
easiest way is to stick your index finger in the holes that run along the edge of the rotors. I if you finger goes in its 1.25 if it doesnt its 1"
works for me. lol
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'84 swb chevy '69 swb chevy '68 swb chevy '95 Impala ss-sold '89 chevy crew cab dually 3+3 |
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