Author Topic: Been offered a Disc rear axle for the Camaro for £100 (Read 1342 times)

Roadkill · « **on:** August 22, 2006, 02:19:45 pm »

It's in good nick, has new pads, good discs and I can (hopefully) swap between the two to get the best ratios and fit my LSD.

It has a sway bar fitted - all I need is the Links to hook it up to mine.

I can check it for compatibility first, before buying.

What do you think ?

Jamieg285 · « **Reply #1 on:** August 22, 2006, 02:21:50 pm »

Sounds good, but full details would be better.

FUBAR · « **Reply #2 on:** August 22, 2006, 02:24:28 pm »

I think I heard somewhere about needing to change the Master or slave cylinder(s) or something as well might be worth checking into just incase my memory is actually working for once...

Roadkill · « **Reply #3 on:** August 22, 2006, 02:26:03 pm »

Quoting: FUBAR

I think I heard somewhere about needing to change the Master or slave cylinder(s) or something as well might be worth checking into just incase my memory is actually working for once...

Hmm, good point . . . . .

Quoting: Jamieg285

Sounds good, but full details would be better.

What sort of details do I need ?

The axle is at Wheels in Motion BTW. . . It came from one of their guy's cars . . .

FUBAR · « **Reply #4 on:** August 22, 2006, 02:27:28 pm »

do you know what year/ car spec its off?

philoldsmobile · « **Reply #5 on:** August 22, 2006, 02:28:14 pm »

there are three types of disc rear axle, one is the PBR unit, and has aluminium calipers (prone to seazure) one is the stock GM unit, and one is the borg warner unit.. if its the stronger BW unit, it already has an LSD,but your existing LSD wont fit..

the braking part that needs changing is the proportioning valve, as the discs need more fluid force to activate than the drums do, so more fluid needs to be diverted to the rears than on a drum braked car..

if its in good nick, its well worth £100

Roadkill · « **Reply #6 on:** August 22, 2006, 02:29:21 pm »

AFAIK it was taken from a B-reg Z28. (mine's an A-Reg)

Although I could've got my cars mixed up . . . .

Jamieg285 · « **Reply #7 on:** August 22, 2006, 02:31:14 pm »

Quoting: FUBAR

do you know what year/ car spec its off?

That's what I was going to say.

Gear size, ratios, splines (if known) the more info the better.

And yes, you should check out the MC situation. I know on the 2nd gens, if swapping to the Fbird discs, you'd need to the full set-up. You may get away with just a prop-valve, but chances are you'd need an MC as well.

Roadkill · « **Reply #8 on:** August 22, 2006, 02:31:19 pm »

Quoting: philoldsmobile

there are three types of disc rear axle, one is the PBR unit, and has aluminium calipers (prone to seazure) one is the stock GM unit, and one is the borg warner unit.. if its the stronger BW unit, it already has an LSD,but your existing LSD wont fit..

It didn't look like ally calipers . . . Also it's defo not a LSD as it was changed for an LSD !

Is the proportioning valve a simple jobbie ?

Roadkill · « **Reply #9 on:** August 22, 2006, 02:33:16 pm »

If I get some piccy's would that help identify it ?

Are there any Part #'s I should be looking for ?

Jamieg285 · « **Reply #10 on:** August 22, 2006, 02:34:03 pm »

Quoting: Roadkill

Is the proportioning valve a simple jobbie ?

*Shouldn't* be too hard. When I get around to mine, I'm going to put in an after market adjustable one. Simply remove exisiting one. Replace/adapt the existing brake line and plumb the prop valve in.

EDIT: you might want/have to consider redoing all the brake plumbing. I don't know how/if the front and rear circuits are joined on the 3rd gen.

Roadkill · « **Reply #11 on:** August 22, 2006, 02:36:56 pm »

Hmm . . . If I have it in the car that would act as a rear line lock as well, wouldn't it ?

Two birds, one stone . . .

FUBAR · « **Reply #12 on:** August 22, 2006, 02:38:36 pm »

Quoting: Roadkill

Also it's defo not a LSD as it was changed for an LSD !

B reg is 1985 correct?
this rules out it coming from a 350 car cos there were none and there were no Borg warner axles that year

See here: http://www.thirdgen.org/1985-chevy-camaro

If its coime from a Z28 not an IROC then it will either be a 3.23:1 of 3.08:1 ratio depending on the engine option taken

FUBAR · « **Reply #13 on:** August 22, 2006, 02:42:37 pm »

however if its from a L69 Manual Transmission IROC then it will be a 3.73:1

you can but hope

Jamieg285 · « **Reply #14 on:** August 22, 2006, 02:44:20 pm »

Quoting: Roadkill

Hmm . . . If I have it in the car that would act as a rear line lock as well, wouldn't it ?

Yes/no. It can be used to reduce the braking force to the rears, but not eliminate it. It can be used for what you want it for

, it's not the ideal solution, but it's better than you're current setup.

Jamieg285 · « **Reply #15 on:** August 22, 2006, 02:45:49 pm »

Quoting: FUBAR

B reg is 1985 correct?
this rules out it coming from a 350 car cos there were none and there were no Borg warner axles that year

Depends, B would have covered Sept-Sept, but I don't know if that was 84-85 or 85-86. Also, there's no guarantee that the Reg plate matches the year of manufacture (my 2nd 2nd Gen doesn't - it's a 79, on an 81 plate, based on when it was imported)

55starchief · « **Reply #16 on:** August 22, 2006, 02:46:49 pm »

Adjustable proportion valves arnt cheap expect to pay £60 up you can get a smal fixed unit from one of the brake companies in the USA for a lot less

Roadkill · « **Reply #17 on:** August 22, 2006, 02:49:16 pm »

Quoting: FUBAR

then it will be a 3.73:1

I think, going by revs @ 70 mph that mine was somewhere near there anyway . . . .

Roadkill · « **Reply #18 on:** August 22, 2006, 02:50:27 pm »

Mine an "A" an is an '83 . . . . . .

I'll drop into them and ask some more questions tomorrow . . .

Will piccy's help ?

Jamieg285 · « **Reply #19 on:** August 22, 2006, 02:50:46 pm »

Quoting: 55starchief

Adjustable proportion valves arnt cheap expect to pay £60 up you can get a smal fixed unit from one of the brake companies in the USA for a lot less

I found them cheaper than that - summit had a good range.

Jamieg285 · « **Reply #20 on:** August 22, 2006, 02:51:48 pm »

Quoting: Roadkill

Will piccy's help ?

It'll confirm it's and axle and has discs

One for the 3rd Gen freaks

FUBAR · « **Reply #21 on:** August 22, 2006, 02:53:52 pm »

Quoting: Jamieg285

One for the 3rd Gen freaks

Not me then... just reading a website over here...

55starchief · « **Reply #22 on:** August 22, 2006, 02:54:05 pm »

Quoting: Jamieg285

It'll confirm it's and axle and has discs

Roadkill · « **Reply #23 on:** August 22, 2006, 02:54:56 pm »

Quoting: Jamieg285

One for the 3rd Gen freaks

(it was originally aimed at PhilO)

And again - Part #'s to look for ? . . . Is the rear bolt-patterns on the cover plate different ? etc . . .

HardRockCamaro · « **Reply #24 on:** August 22, 2006, 05:12:12 pm »

As far as I am aware:

Tenth digit of the VIN is model year.
E=1984
F=1985
G=1986
etc

1: If it's from a car prior to April 1985 it MUST have a LSD to have the rear discs option. You couldn't have the rear discs without a LSD until then. From 86 on it was back to LSD required so there's only a small window for it to have discs and no LSD.

2. Assuming it is from this short window in time and is a Z28 (and doesn't have the IROC option package, remember IROC was an option for Z8 at the time not a separate model) then the rear axle ratio will be 3.08 (auto) or 3.23 (man). If it's an IROC it'll be 3.23 unless it had the HO engine in which case it'll be a lovely 3.73 !

3. There was no borg warner axle in 1985

4. You need the brake proportioning valve and I believe handbrake cable and whatnot.

8th and 10th digit of VIN would be very useful as would info on whether it's an auto or manual and if it has the IROC package or not. If it's an IROC it would have the graphics, fog lamps, 16" wheels etc (and more to the point RPO code B4Z on the RPO codes sticker in the centre console or spare wheel well). While we're at it, G80 means LSD and in case he's heaved it off a different car J65 is rear discs.