Heavy duty rear drums on C10? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jmil1974 · 09-08-2002, 12:46 AM

I know there was an option for HD drums on the rear for our trucks. Was this 3/4 ton + only? Could we do it on a half ton reordering OEM repops? Would they fit on factory axles?

Thanks!
Jason

*Fast68Chevy* · 09-08-2002, 02:06 AM

all our rear brakes are 11x2"

you MAY be able to swap off the 2 3/4" rear brakes off a 77=79 Big10 or Heavy Half onto your existing housing and shafts,

the 2 3/4" backing plates are offset different and GM didnt change shaft length to accomodate them

peope typically call the big 10 axles the 5/8 ton axles.
and sometimes trhey go even as far as to say are 3/4 ton or HD, but actually its just the same old 12 bolt same rating, just is wearing wider brake shoes., nothing else differs cept the brakes,

good luck

junkyardjohn · 09-08-2002, 02:59 AM

JMIL1974 -- I PUT A SET OF DRUMS & BACKING PLATES OFF OF A 75 1/2 TON ON MY 71. I THINK THEY WERE 2.5" OR 2.75". IT WAS A SIMPLE, WORTHWHILE SWAP AS IT GAVE ME ALOT MORE SURFACE FOR STOPPING POWER.

*Fast68Chevy* · 09-08-2002, 06:14 AM

2 3/4" = 2.75"
there were only two widths of brakes ever made, 2" and 2 3/4"

good luck!

junkyardjohn · 09-08-2002, 12:42 PM

YES RANDY .... I LEARNED HOW TO CONVERT DECIMALS TO FRACTIONS ABOUT THIRTY FIVE YEARS AGO. I THINK IT WAS IN THE SIXTH (6.0) GRADE. LOL

(NOW IF I COULD JUST GET THIS SPELLING THING DOWN) LOL

I WAS JUST TRYING TO SUPPLY SOME HELPFUL INFORMATION ON A CONVERSION THAT I HAD ACTUALLY DONE, & DRIVEN MANY , MANY MILES, INSTEAD OF "QUOTE" you MAY be able to swap off the 2 3/4" rear brakes off a 77=79 Big10 or Heavy Half onto your existing housing and shafts,

WIDER DRUMS WERE ALSO AVAILABLE FOR 12 BOLT REARENDS ON ALOT MORE YEARS THAN JUST 77, 78, & 79

**MikeB** · 09-08-2002, 05:49 PM

Don't know what year your truck is, but I went to 5 lug 71/72 parts on mine when I did a front disc brake conversion back in 1996. The finned rear drums make a big difference in fade resistance. Of course, if that's what you already have, try name-brand wheel cylinders and shoes. I just re-did my rears with Wagner parts and now they are even better. I had been thinking about rear discs, but not any more.

chevy2racr · 09-08-2002, 10:06 PM

what can I get drums for that aren't finned?

jmil1974 · 09-08-2002, 11:04 PM

Well, I want to keep my 6 lug wheels. Any thoughts on which drums (year, etc.) would fill the bill?

*Fast68Chevy* · 09-09-2002, 03:58 AM

Quote:

Originally posted by junkyardjohn
YES RANDY .... I LEARNED HOW TO CONVERT DECIMALS TO FRACTIONS ABOUT THIRTY FIVE YEARS AGO. I THINK IT WAS IN THE SIXTH (6.0) GRADE. LOL (NOW IF I COULD JUST GET THIS SPELLING THING DOWN) LOL

I WAS JUST TRYING TO SUPPLY SOME HELPFUL INFORMATION ON A CONVERSION THAT I HAD ACTUALLY DONE, & DRIVEN MANY , MANY MILES, INSTEAD OF "QUOTE" you MAY be able to swap off the 2 3/4" rear brakes off a 77=79 Big10 or Heavy Half onto your existing housing and shafts,

WIDER DRUMS WERE ALSO AVAILABLE FOR 12 BOLT REARENDS ON ALOT MORE YEARS THAN JUST 77, 78, & 79

actually the big 10 option was only available for about three of four years, thats what the larger brakes came on because the GVW of them were alot higher than a std C10, so.....
youre really sounding like youre replying in hostile fashion, it seems, are you ok ?? have a bad day or something happen ?

the reason why i said MAY be able to swap is because the housing is narrower just a little bit before 70 and the shafts are shorter also,
and after 72 both are a little longer length,
the 73-up shafts same length as 70-72, yet the housings are little narrower in 73-up than in 70-72
the mid 70s Big10 trucks have deeper offset brake backing plates than the std C-10 had and the wider drums and all 71-up have fin drums and i dont know if any 4x4 could have Big10 option or not,
if so then you can find one of the trucks and take those parts off for you 6 lug 2 3/4" rear brakes,
otherwise you are outta luck

if i can locate my 78 Big10 SPID label around here again I can get the GM RPO code for the Big10 package and find out exactly what years it was available, and i believe was only 77-79, the Gov't caught GM doing this GVW trick on the C-10 models and stopped them from doing it anymore past 79. they didnt have to put ewmissions and cats on the C10 trucks by having the Big10 package on them, 8 leaves per pack and the 2 3/4" brakes allowed GVW of 6200lbs on a C10 which is quite a bit more than a std C10.

good luck

jmil1974 · 09-09-2002, 10:12 AM

Thanks Fast68chevy! Any idea of where I can find out if any 4x4s came with the big10 option? Maybe 4x4s got the HD brakes by default?

09-08-2002, 12:46 AM	#1
jmil1974 Ain't we cute? Join Date: May 2002 Location: Friendswood, TX Posts: 700	Heavy duty rear drums on C10? I know there was an option for HD drums on the rear for our trucks. Was this 3/4 ton + only? Could we do it on a half ton reordering OEM repops? Would they fit on factory axles? Thanks! Jason

09-08-2002, 02:06 AM	#2
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	all our rear brakes are 11x2" you MAY be able to swap off the 2 3/4" rear brakes off a 77=79 Big10 or Heavy Half onto your existing housing and shafts, the 2 3/4" backing plates are offset different and GM didnt change shaft length to accomodate them peope typically call the big 10 axles the 5/8 ton axles. and sometimes trhey go even as far as to say are 3/4 ton or HD, but actually its just the same old 12 bolt same rating, just is wearing wider brake shoes., nothing else differs cept the brakes, good luck Last edited by Fast68Chevy; 09-08-2002 at 02:08 AM.

09-08-2002, 02:59 AM	#3
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	JMIL1974 -- I PUT A SET OF DRUMS & BACKING PLATES OFF OF A 75 1/2 TON ON MY 71. I THINK THEY WERE 2.5" OR 2.75". IT WAS A SIMPLE, WORTHWHILE SWAP AS IT GAVE ME ALOT MORE SURFACE FOR STOPPING POWER. __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

09-08-2002, 12:42 PM	#5
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	YES RANDY .... I LEARNED HOW TO CONVERT DECIMALS TO FRACTIONS ABOUT THIRTY FIVE YEARS AGO. I THINK IT WAS IN THE SIXTH (6.0) GRADE. LOL (NOW IF I COULD JUST GET THIS SPELLING THING DOWN) LOL I WAS JUST TRYING TO SUPPLY SOME HELPFUL INFORMATION ON A CONVERSION THAT I HAD ACTUALLY DONE, & DRIVEN MANY , MANY MILES, INSTEAD OF "QUOTE" you MAY be able to swap off the 2 3/4" rear brakes off a 77=79 Big10 or Heavy Half onto your existing housing and shafts, WIDER DRUMS WERE ALSO AVAILABLE FOR 12 BOLT REARENDS ON ALOT MORE YEARS THAN JUST 77, 78, & 79 __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

09-08-2002, 05:49 PM	#6
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,475	Don't know what year your truck is, but I went to 5 lug 71/72 parts on mine when I did a front disc brake conversion back in 1996. The finned rear drums make a big difference in fade resistance. Of course, if that's what you already have, try name-brand wheel cylinders and shoes. I just re-did my rears with Wagner parts and now they are even better. I had been thinking about rear discs, but not any more. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

09-08-2002, 06:14 AM	#4
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	2 3/4" = 2.75" there were only two widths of brakes ever made, 2" and 2 3/4" good luck!

09-08-2002, 10:06 PM	#7
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	what can I get drums for that aren't finned? __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

09-08-2002, 11:04 PM	#8
jmil1974 Ain't we cute? Join Date: May 2002 Location: Friendswood, TX Posts: 700	Well, I want to keep my 6 lug wheels. Any thoughts on which drums (year, etc.) would fill the bill?

09-09-2002, 10:12 AM	#10
jmil1974 Ain't we cute? Join Date: May 2002 Location: Friendswood, TX Posts: 700	Thanks Fast68chevy! Any idea of where I can find out if any 4x4s came with the big10 option? Maybe 4x4s got the HD brakes by default?



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