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Old 01-27-2006, 08:02 AM
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GM A body?? F body?? How do you know?

I have a '67 Cadillac Coupe Deville as my daily driver/project car. As the car is GM I suspect that it shares many parts with other GM cars of the era, but I am at a loss for how to find out.

My main focus right now is finding a front disc brake conversion, and maybe some headers.

Any help or advice will be much appreciated, thanks!

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Old 01-27-2006, 10:31 AM
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Start by looking at other GM cars that are similar in appearance and size. Caddys usually have a different body code due to longer wheelbases, but the bodies and mechanicals are usually the same as some Buick/Olds/Pontiac models. For disc brakes, check other big Caddys first. Around 69-70 they are likely all front disc brakes. IIRC there is no major suspension revision until the 80s, so disc brake spindles should fit from 70s Caddys. I would be surprised if mid 70s Buick/Olds/Pontiac big cars had different spindles.

But this is what you asked for (picked up from a Monte Carlo board):

Here is a complete (I hope) list of GM platform letter designations.
(I am doing this from memory):
Note: The names shown are for vehicles sold in U.S. Names of vehicles
sold in Canada may vary slightly. Also, years listed may be 1 year.

Steve Ochs - Engineer - GM Powertrain - Transmission Division


GM Passenger Vehicles:
A - 64-80: RWD Cutlass/Skylark/Chevelle/LeMans/Malibu/Regal/Special
82-96: FWD Ciera/Century/Celebrity/6000
A Special - 68-80: RWD Monte Carlo/Grand Prix

B - 62-95: RWD Delta

C - Dn-83: RWD Delta 98/Electra
84-Up: FWD 98/Park Ave

D - Dn-96: RWD Fleetwood/Sedan DeVille/Limo

E - Dn-94: Toronado/Eldorado/Riviera

F - 67-up: Camaro/Firebird

G - 81-88: RWD Sedan Cutlass/Regal/Malibu/Bonneville
95-up: FWD Aurora/Riviera
G-Special - 81-88: RWD Coupe Cutlass/Regal/Monte Carlo/Grand Prix

H - 71-79: RWD Vega/Astre/Monza wagon/Sunbird wagon
85-Up: FWD Bonneville/Delta 88/LeSabre

H-Special - 75-80: RWD Monza/Starfire/Skyhawk/Sunbird
(excluding wagon)

J - 81-Up: FWD Firenza/Skyhawk/Sunbird/Cavalier/Sunfire

K - 85-Up: FWD Seville
K Special - 84-Up: FWD Deville/Concours

L - 87-96: FWD Corsica/Berretta

M - 85-Up: FWD Chevy Sprint/Geo Metro

N - 85-Up: FWD Calais/Somerset-Skylark/Grand Am

P - 84-88: Fiero
97-Up: Electric - EV1

P-90 - 1997-Up: FWD Malibu/Cutlass

S - 84-Up: Chevy Nova/Geo Prizm

T - 74-85: RWD Chevette/T-1000

V - 97-Up: RWD Cadillac Catera

W - 1988-1997/98: FWD (GM-10) Cutlass Supreme/Regal/Grand Prix/Lumina
1997/98-Up: FWD (MS-2000) Intrigue/Monte Carlo/Grand

X - 62-79: RWD Nova/Omega/Ventura/Apollo/Phoenix (also the original RWD
80-85: FWD Omega/Skylark/Phoenix/Citation

Y - 53-Up: Corvette

Z - 58-69: Corvair
90-Up: Saturn

GM Trucks:
C - All: Full Size 2WD Pickup
Dn-87: 2WD Blazer/Jimmy/Suburban/Crew Cab
92-Up: 2WD Tahoe/Yukon/Suburban/Crew Cab

G - All: Full Size Van

K - All: Full Size 4WD Pickup, including Blazer/Suburban/Crew Cab except
Dn-87: 4WD Blazer/Jimmy/Suburban/Crew Cab
92-Up: 4WD Tahoe/Yukon/Suburban/Crew Cab

L - 91-Up: AWD Astro/Safari

M - 85-Up: 2WD Astro/Safari

P - Delivery Van

R - 88-91: 2WD Blazer/Jimmy/Suburban/Crew Cab (old-style body)

S - 82-94: 2WD S-10 Pickup/S-15 Pickup/S-10 Blazer/S-15 Jimmy
95-Up: 2WD S-10 Pickup/Sonoma/Blazer/Jimmy

T - 82-94: 4WD S-10 Pickup/S-15 Pickup/S-10 Blazer/S-15 Jimmy/Bravada
95-Up: 4WD S-10 Pickup/Sonoma/Blazer/Jimmy/Bravada

U - 88-96: Lumina APV/Trans Sport/Silhouette
97-Up: Venture/Trans Sport/Silhouette

V - 88-91: 4WD Blazer/Jimmy/Suburban/Crew Cab (old-style body)
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Old 01-27-2006, 02:15 PM
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Is that all you could come up with ? Just kidding. Great list!!!

B, C, and D share a lot of chassis components, but the pre-70 or 71 Chevy versions were very different. Basically any full-size, RWD B, C, or D from 71-on should be good candidates for front discs.

To make sure, go to a parts store and ask for their Moog catalog (or similar chassis parts catalog) Look up ball joint part numbers and specs for all the cars in question. Chances are you'll find that later full size cars carry the same ball joint part numbers which means you can swap in the spindle and brake hardware from that vehicle.

You can also check on several other things; like the mounting pattern for the ball joint. Even if the ball joints aren't the same part number, often times the mounts are the same, meaning you could use the spindles by bolting the donor car's ball joints in place of yours. Since almost all of GMs cars share the same kingpin inclination you shouldn't have camber troubles later. You may have to alter, trim, or otherwise modify the new spindle in case there are interference issues. Sometimes they're cast with a tab on them to limit steering travel. I had to cut some off when I put truck spindles on my 66 Bonneville.

The same goes for the new master cylinder you'll need. chances are the new disc/drum configuration can be actuated by the master cylinder from which the new discs came. Many of the full-size mounting patterns and plunger offsets for brake master cylinders are identical.
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Old 02-02-2006, 02:54 PM
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I have found a good way to check out some parts interchangeability is to look up the parts on a parts store website and see if you get the same part number. A lot of parts places donít have catalogs to look at anymore.
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