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02-11-2013, 08:21 AM
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#1
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Join Date: Sep 2005
Location: sewell, NJ
Posts: 43
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disc brake rear in my drum brake bird HELP!
So the rear in my 94 bird went on me, and I'm in a scramble to get a rear for it......I'd like to get a 3.23 posi for it, but I'll prob only find one of those in a z-28 or T/A.....now my question is if i get a disc brake rear out of a t/a can i bolt my drum brake backing plates to the axle tubes and use it in my car?
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no replacement for displacement
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02-11-2013, 08:28 AM
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#2
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Join Date: Jul 2009
Location: North Jersey
Posts: 464
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why would you want to convert it back to a drum if you end up getting a disc rear?
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02-11-2013, 08:32 AM
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#3
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Power Member/NJFBOA Bookie/Moderator
Join Date: Jun 2009
Location: North Jersey = Best Jersey.
Posts: 4,435
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If you want to make a 200-some-odd round trip, you can have a V6 drum rear out of a '95 for free.
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1995 Firebird... Stock-ish.
Quote:
Originally Posted by LS1ow
Good. He microwaved my phone 6 years ago, i hope his intake erupts.
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02-11-2013, 08:41 AM
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#4
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Quote:
Originally Posted by richduty455
.....now my question is if i get a disc brake rear out of a t/a can i bolt my drum brake backing plates to the axle tubes and use it in my car?
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yes.
Quote:
Originally Posted by donnj
why would you want to convert it back to a drum if you end up getting a disc rear?
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I don’t know these cars, what is involved in going to rear disc brakes? Is the master different? Is there a prop valve or just an ABS units like the later ones? Will the ABS be confused if you change to discs? What line changes are needed in the back? I know how it works for older cars, but I’m not sure on 4th gens.
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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02-11-2013, 08:58 AM
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#5
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by BonzoHansen
I don’t know these cars, what is involved in going to rear disc brakes? Is the master different? Is there a prop valve or just an ABS units like the later ones? Will the ABS be confused if you change to discs? What line changes are needed in the back? I know how it works for older cars, but I’m not sure on 4th gens.
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I had posted the same thing as Don but then deleted it for that reason. I don't know what's involved. I think the prop block is the same but I'm not sure.
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02-11-2013, 09:20 AM
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#6
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Join Date: Sep 2005
Location: sewell, NJ
Posts: 43
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i want to keep the drum brakes......even if i got a drun rear, i'd prob unbolt my backing plates that way I don't have to play with opening up the brake system.....so i should be able to bolt the drum backing plates to a disc rear?
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no replacement for displacement
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02-11-2013, 09:56 AM
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#7
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Yes, the 10 bolt flanges are the same. You unbolt the caliper mount and bolt up your drum brake setup. You'll probably have to at least pull the drum off to bolt it up to the axle tube. The disc rear will have hoses going to the calipers while your drum rear has hard metal lines going to the wheel cylinders. Start spraying penetrating oil if you don't want to do an overhaul on the system. Note the routing of the ebrake cables too.
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02-11-2013, 11:21 AM
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#8
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Join Date: Mar 2012
Location: barnegat new jersey
Posts: 19
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Quote:
Originally Posted by richduty455
So the rear in my 94 bird went on me, and I'm in a scramble to get a rear for it......I'd like to get a 3.23 posi for it, but I'll prob only find one of those in a z-28 or T/A.....now my question is if i get a disc brake rear out of a t/a can i bolt my drum brake backing plates to the axle tubes and use it in my car?
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i've got a disc rear out of my 93 Z28, 6 speed.i want 200.00 for it
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02-11-2013, 11:38 AM
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#9
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Join Date: Sep 2005
Location: sewell, NJ
Posts: 43
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is it a 3.23?
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no replacement for displacement
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02-11-2013, 11:41 AM
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#10
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Oh and I completely forgot to mention you have to pull the axles out....derp.
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02-11-2013, 01:07 PM
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#11
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Join Date: May 2009
Location: Highland Mills, NY
Posts: 1,915
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Quote:
Originally Posted by sweetbmxrider
Oh and I completely forgot to mention you have to pull the axles out....derp.
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Was going to update your write up with this......but you caught it
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2000 Camaro SS 610rwhp/570rwtq LS2 440, 12 bolt 3.73, tranzilla t56
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02-11-2013, 02:58 PM
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#12
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Stalker
Join Date: Aug 2004
Posts: 12,077
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were all drum rears 3channel? if so a 4 ch disc rear would be useless because it won't have the provision for the abs sensor that goes into the top of the housing.
Last edited by V; 02-11-2013 at 02:59 PM.
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02-11-2013, 03:45 PM
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#13
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Join Date: Sep 2005
Location: sewell, NJ
Posts: 43
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if it helps car is a 94 v6, rear drum no traction control.
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no replacement for displacement
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02-11-2013, 05:11 PM
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#14
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Stalker
Join Date: Aug 2004
Posts: 12,077
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id suggest just getting another drum rear and doing a quick swap.
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02-11-2013, 08:45 PM
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#15
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Join Date: Jun 2007
Location: Arm pit of the world... NJ
Posts: 2,676
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Quote:
Originally Posted by 91zconvert
i've got a disc rear out of my 93 Z28, 6 speed.i want 200.00 for it
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Quote:
Originally Posted by richduty455
is it a 3.23?
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It's either 2.73 or 3.23. That's what came with the 6 speed in 93.
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John
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02-12-2013, 07:27 AM
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#16
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Quote:
Originally Posted by V
were all drum rears 3channel? if so a 4 ch disc rear would be useless because it won't have the provision for the abs sensor that goes into the top of the housing.
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Yeah, good point. It would be a 3 channel rear. Not having abs makes me not think/care about it
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02-12-2013, 12:55 PM
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#17
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Join Date: Nov 2012
Location: Millstone, NJ
Posts: 641
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Make sure u get wat gear ratio ur car has or ur speedo will be off and need a tune. Pretty sure the masters are the same for drum and disc abyways. If not just get a 40 dollar prop valve or i wouldnt even worry
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94 TA GT. Stock 350, cam, exhaust
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02-12-2013, 03:12 PM
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#18
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Join Date: Sep 2005
Location: sewell, NJ
Posts: 43
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Yea thats why I want to get 3.23's.....car had them originally and p.o changed it to 3.42 non posi and didn't fix the speedo....so as i drive the car i have to do math...keeps my mind sharp atleast....hahaha
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no replacement for displacement
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02-20-2013, 07:37 PM
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#19
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Join Date: Dec 2004
Location: Galloway, NJ
Posts: 3,964
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If you convert to disc, you will need to change out to a LT1 prop/ABS unit since drums don't require as much pressure as disc do to operate properly, spo the calipers may not function correctly. Also, drums need residual pressure to prevent the pistons in the wheels cylinders to retract fully. This may prevent the pistons in the calipers to retract fully, making them push up against the rotors.
3.23's are the only rears the 3.4 F-bodies came with ( Manual & Auto) in 96+ the ratios were either 3.08 (Auto), 3.23 (Manual) or 3.42 posi ( Y87 performance package)
If you are to go rear disc, may I recommend LS1 setup. I find it more reliable, and with the hat system, replacing pads is a sinch. You will need to change your front parking brake cable to a 96+ because it is slightly longer to accept the LS1 cable lines.
Oh, and I have both LS1 and LT1 full sets for sale if interested
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1996 Camaro C/S - 2/3 Corvette Engine
Quote:
Originally Posted by BigAls87Z28
Uh yeah, after they surprized buttsecks us at Pearl Harbor?
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02-25-2013, 08:01 AM
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#20
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Join Date: Mar 2012
Location: barnegat new jersey
Posts: 19
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Quote:
Originally Posted by richduty455
Yea thats why I want to get 3.23's.....car had them originally and p.o changed it to 3.42 non posi and didn't fix the speedo....so as i drive the car i have to do math...keeps my mind sharp atleast....hahaha
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well mine came out of a 93 6 speed,so it's a 3.23.
if you want it, i got it. $200.00
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02-25-2013, 07:04 PM
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#21
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Join Date: Jun 2007
Location: Arm pit of the world... NJ
Posts: 2,676
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Quote:
Originally Posted by 91zconvert
well mine came out of a 93 6 speed,so it's a 3.23.
if you want it, i got it. $200.00
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Are you sure? 93 6 speeds came with 2.73 too.
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John
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02-26-2013, 08:37 AM
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#22
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Join Date: Mar 2012
Location: barnegat new jersey
Posts: 19
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Quote:
Originally Posted by Featherburner
Are you sure? 93 6 speeds came with 2.73 too.
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i was going by what Blacdout96 was saying, but if you want i could go check it to be positive.
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02-26-2013, 11:18 PM
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#23
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Join Date: Dec 2004
Location: Galloway, NJ
Posts: 3,964
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My info is based off of 4th gen v6 cars only. I believe with v8's you had a choice of 2.73, 3.23, and 3.42 for manual 6speeds, but don't quote me on that.
91z, if you want to see what ratio you have, make a mark on the axle, and a reference point. Then make a mark on the pinion shaft where the u-joints connects to the rear. Now turn the pinion and count how many times it takes to spin that to make the axle line back up with the reference point. (A.k.a, 3
1/4 turn - 3.23, 3 1/2 - 3.42, a little less the 3 turns - 2.73) and there you have your ratio.
Richduty, you say you have 3.42 non posi? Either the posi unit is bad, or the info is wrong. All 3.42 4th Gen rears were posi, either auburn LSD (lt1 & y87 rpo) and zexel (ls1 & y87) so unless the guy put 3.42's and no posi, I'd double check. Do the following test I stated above to double. Check. And 3.42's change the speed minutely at best. I put 3.23 from 3.08, and notice minimal change in speed to actual speed.
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1996 Camaro C/S - 2/3 Corvette Engine
Quote:
Originally Posted by BigAls87Z28
Uh yeah, after they surprized buttsecks us at Pearl Harbor?
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Last edited by Blacdout96; 02-26-2013 at 11:32 PM.
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05-11-2015, 08:26 PM
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#24
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Join Date: Oct 2010
Location: deptford nj
Posts: 4
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I did just that stiil have the disc setup.If you change to the disc setup you have to add hoses to the rear & change the master.
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