68 rearend - 5 x 4.75 conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1968SWBBigBlock · 05-14-2011, 09:23 PM

Does anyone know what drums to buy to convert the rearend over to 5 lugs a 4.75" bolt circle on the rear drums?

danman987123 · 05-14-2011, 10:56 PM

i just bought a rearend from a 97 camaro z28.....cut all the brackets off of it that go on the camaro...then i got two new axle seats which u can make or buy and tada.....i spend 250 on a rearend from a 97 z28 that had 40k miles...i now have 4wheels disc brakes and a posi trac rearend....by the way it goes right in no problems at all even the width is perfect...just trying to send another option ur way.....plus 4wheels disc looks cool and better stopping power than a drum....and i dont think 250 was bad....just shop around at ur local junkyard...good luck though whichever u choose to go

crazy longhorn · 05-15-2011, 12:24 AM

Quote:

Originally Posted by 1968SWBBigBlock

Does anyone know what drums to buy to convert the rearend over to 5 lugs a 4.75" bolt circle on the rear drums?

I would look into late 60's, to early 70's Impala. They use the big drum & same outer bearing as the truck .

1970 CST STEP · 05-15-2011, 12:56 AM

Quote:

Originally Posted by danman987123

i just bought a rearend from a 97 camaro z28.....cut all the brackets off of it that go on the camaro...then i got two new axle seats which u can make or buy and tada.....i spend 250 on a rearend from a 97 z28 that had 40k miles...i now have 4wheels disc brakes and a posi trac rearend....by the way it goes right in no problems at all even the width is perfect...just trying to send another option ur way.....plus 4wheels disc looks cool and better stopping power than a drum....and i dont think 250 was bad....just shop around at ur local junkyard...good luck though whichever u choose to go

4 wheel does look cool, but it does NOT stop better than drum! The drum has more "swept" area than disc. Not trying to argue or start an argument, just callin it the way it is..........

TrkEnvy · 05-15-2011, 01:22 AM

Quote:

Originally Posted by 1970 CST STEP

4 wheel does look cool, but it does NOT stop better than drum! The drum has more "swept" area than disc. Not trying to argue or start an argument, just callin it the way it is..........

If drums stop better why dont they use them in racing instead of discs?? I cant fathom drums stopping better than a disc brake setup..

crazy longhorn · 05-15-2011, 01:32 AM

I drive an 02 silverato 1500 (DD), with 4w disc....on a hard stop, I think the 69 Longhorn has it , hands down. The longhorn is a manual ,disc front/drum rear. The biggest thing I saw with drums, was that if you got em hot, they would "fade'... crazyL

bo-w · 05-15-2011, 05:37 AM

Quote:

Originally Posted by TrkEnvy

If drums stop better why dont they use them in racing instead of discs?? I cant fathom drums stopping better than a disc brake setup..

if disk brakes stop better then why dont you see them on Big rigs? the surface contact area between a shoe and a drum is much larger than between a pad and its disk. im not saying drums are better, they are way more prone to "fade" and are heavier than disks. just my .02

jorgensensc · 05-15-2011, 09:57 AM

The vans for a short while in the early 70's had 5 on 4 3/4. I also learned through some research that the front dorms on a 1956 belair were the same and would work. Belair guys will give them away when doing a front disc conversion, which most do. My whole truck is setup to run dual bolt pattern. I have both 5 on 5 and 5 on 4 3/4 bolt patterns on it. Currently running the 5 on 5.
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ProStreet68SB · 05-15-2011, 12:40 PM

Quote:

Originally Posted by bo-w

if disk brakes stop better then why dont you see them on Big rigs? the surface contact area between a shoe and a drum is much larger than between a pad and its disk. im not saying drums are better, they are way more prone to "fade" and are heavier than disks. just my .02

Discs > drums. And to answer your question, some of the newer big rigs are coming with disc brakes. So thanks for playing, come and try again sometime.

cleanfreak · 05-15-2011, 11:24 PM

crazylonghorn nailed it. I have 1965 impala 11" drums on my 68 , machined axles to fit center hole and had bolt patern re-drilled- perfect fit

danman987123 · 05-16-2011, 10:31 PM

not starting argument either with anyone....i know ur right about drums having a bigger surface to stop with....but a caliper in good working condition would be better just due to the amount of force the caliper has to clamp on a rotor and slow the car/truck down quicker.....

**JDL** · 05-16-2011, 10:44 PM

Quote:

Originally Posted by bo-w

if disk brakes stop better then why dont you see them on Big rigs? the surface contact area between a shoe and a drum is much larger than between a pad and its disk. im not saying drums are better, they are way more prone to "fade" and are heavier than disks. just my .02

Most semi truck air brake systems utilize drum brakes, including S-cam systems. Although disc brakes are more efficient, drum brakes are an older technology that is more common in semis due to their lower cost. Drum brakes do not dissipate heat evenly and cause more wear on braking systems than disc brakes

Read more: Types of Air Brake Systems on Semis | eHow.com http://www.ehow.com/list_7591185_typ...#ixzz1MZdpITzU

05-14-2011, 09:23 PM	#1
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	68 rearend - 5 x 4.75 conversion Does anyone know what drums to buy to convert the rearend over to 5 lugs a 4.75" bolt circle on the rear drums? __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree

05-14-2011, 10:56 PM	#2
danman987123 Registered User Join Date: Apr 2008 Location: texas Posts: 127	Re: 68 rearend - 5 x 4.75 conversion i just bought a rearend from a 97 camaro z28.....cut all the brackets off of it that go on the camaro...then i got two new axle seats which u can make or buy and tada.....i spend 250 on a rearend from a 97 z28 that had 40k miles...i now have 4wheels disc brakes and a posi trac rearend....by the way it goes right in no problems at all even the width is perfect...just trying to send another option ur way.....plus 4wheels disc looks cool and better stopping power than a drum....and i dont think 250 was bad....just shop around at ur local junkyard...good luck though whichever u choose to go

05-15-2011, 01:32 AM	#6
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: 68 rearend - 5 x 4.75 conversion I drive an 02 silverato 1500 (DD), with 4w disc....on a hard stop, I think the 69 Longhorn has it , hands down. The longhorn is a manual ,disc front/drum rear. The biggest thing I saw with drums, was that if you got em hot, they would "fade'... crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

05-15-2011, 09:57 AM	#8
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Re: 68 rearend - 5 x 4.75 conversion The vans for a short while in the early 70's had 5 on 4 3/4. I also learned through some research that the front dorms on a 1956 belair were the same and would work. Belair guys will give them away when doing a front disc conversion, which most do. My whole truck is setup to run dual bolt pattern. I have both 5 on 5 and 5 on 4 3/4 bolt patterns on it. Currently running the 5 on 5. Posted via Mobile Device __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

05-15-2011, 11:24 PM	#10
cleanfreak Registered User Join Date: Oct 2009 Location: port robinson ontario canada Posts: 400	Re: 68 rearend - 5 x 4.75 conversion crazylonghorn nailed it. I have 1965 impala 11" drums on my 68 , machined axles to fit center hole and had bolt patern re-drilled- perfect fit

05-16-2011, 10:31 PM	#11
danman987123 Registered User Join Date: Apr 2008 Location: texas Posts: 127	Re: 68 rearend - 5 x 4.75 conversion not starting argument either with anyone....i know ur right about drums having a bigger surface to stop with....but a caliper in good working condition would be better just due to the amount of force the caliper has to clamp on a rotor and slow the car/truck down quicker.....



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