I've been reading some of the threads in here and I think someone said that all formula's came with 4-wheel disc brk. It's got the hood of a frmla., but(shudder) DRUMS.
Is it maybe not a formula from the factory or what???

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14X3 o.e., functional formula hood(for sale in future), uhhh..., umm...

Am I the only person who believes a car has feelings, emotions, and a soul??

 

...I have seen many documented Formulas with drum brakes in the rear. The 4-wheel disc package in the '88-'89 Formulas was RPO J65, and it was a $179 option in the Formula. It was a required option with the TPI 5.0 and 5.7 liter engines (and it was not available with the TBI engine). It was standard in the GTA those years.

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jimbo

Mosquito Coast F-Body Association (MCFBA)

1991 Formula SLP350
1999 Trans Am Firehawk

 

it was available on all formulas reguardless of TBI/TPI and was NEVER mandatory.....

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1989 pontiac firebird
bright red exterior(just repainted)
grey interior
5 spd
305 TBI (stock)
WS.6 formula wheels
3.73 posi rear end
http://members.aol.com/j007golden/Mikey89.html
http://www.geocities.com/firebird/myfirebird.html
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1985 trans am
factory bright yellow
4 wheel disks
16 inch wheels
305 TPI
power antenna and mirrors
t tops

 

yep. mine was originaly 305 tpi with drums

 

My friend had a '91 Formula, 305 TBI, with rear drums.

 

1990 formal 305 tbi rear drums.

 

if it means anything I know of 2 1991 Z28's with FACTORY 350/autos and drum brakes out back. The one had 18K on it when bought in 1993 and the other one i currently own.

 

So a 91 TA with WS6 and rear drums is no big deal? Not that I'm not throwing the drums in the trash first chance I get anyway.

 

For most years, WS6 didnt mean disc brakes, the disc brakes were usually an option separate from it.

 

Nope... I have one too.



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91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

Built on Wednesday

 

For 1982 at least, WS6 DOES mean 4-wheel disc brakes, at least on Trans Am; not sure about Camaro, but it's probably the same. Cars that had drums in the rear were marked "WS7".

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1982 Recaro Trans Am LU5/WS6/Y84, lowest mileage '82 T/A yet! - http://indiemonkey.com/82recaro
1985 basic Firebird, LB8/F41/GU6/DE1/, '82 T/A wheels, CB, 128k - Get JPG picture here

 

I bought an '88 Formula new way back when, 305 TBI. It had drum brakes out back.

 

The deal with the 1991 cars having drum brakes that should have disc brakes is due to either a shortage of disc brakes, or a strike at the disc brake factory, I forget which. It happened sometime in Winter/Spring 1991, so those cars built in that time period got drum brakes instead. My details are sketchy but I hope you get the idea.

Also from what I have heard, all TBI cars have rear drum brakes, regardless of the car they are in.


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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Kevin is on the right track about the late model 3rd Gen F-bodies. My GTA has rear Aluminum drums where ALL the documentation says it is suppose to have 4 wheel disk brakes STOCK.

When I enquired to GM back in 1991 they informed me they were switching over totally to 10 bolt from 9 bolt and they encountered problems with the new 10 bolt rear disk. So while they were re-engineering the design they used drum brakes. But if you car SHOULD have had disks, they gave you an Aluminum drum instead (though the Aluminum drum was available as an option on other cars).

As the majority of your braking is done by the front disks, you shouldn't fret over having rear drums. You can run 15" wheels with rear drums which is good for tire selection should you want to use slicks at the track. A 15" rear wheel won't fit over a rear disk to my knowledge. A better solution for braking is to go with an aftermarket larger front disk.