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Frames
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1964-67
A-bodies used the same frame design, but different models and body-styles utilized various
body mounting, while all frames had a 115 inch wheelbase. The '64-'67 boxed convertible
frames use welded-on tabs to provide attach points for the transmission crossmember. (So,
if updating the drivetrain with more modern components such as the TH400 transmission, you
must consider this: Since the TH400 was not available in the 1966 and earlier A-body, the
tabs do not extend far enough rearward to support the crossmember for that application.
You will need to cut the tabs off of a 67'-up frame and weld them to the earlier frame in
the appropriate position.)
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1968-72
frames had two different wheelbases, a 116 and 112 inch wheelbase. Sedans, station wagons,
and utilities like the El Camino used a 116 inch frame, and the frame is interchangeable,
except that the sedan had non-boxed rails.
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The
hardtop and convertible used a 112-inch wheelbase version, and all models except for
Pontiac 455 powered hardtops and convertibles interchange. The convertible
utilized a
boxed design, for added strength.
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1969-72
Grand Prixs and 1970 Monte Carlos used a modified hardtop frame, and the only design
difference is the movement of the front wheels four inches forward of the traditional
front wheel position on the hardtop and convertible. The engine and tranny position
remained at the same place, but the mass of the components resulted in the engine and
tranny combo behind the front wheels. The frame's wheelbase dimensions measure 116 inches,
and this frame design is exclusive to the Grand Prix or Monte Carlo.
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The
1969-72 Grand Prix was designated as a "G" body by the Fisher Body division, but
A-car suspension components are used. The Monte Carlo was designated as the
"A-Special" series, and the official use of the G-car designation was in 1982.
Here's
a comprehensive list of frames that interchange with 1968-72 A-body hardtops/convertibles
112"
wheelbase only
- Buick
Special '68 2dr.,conv
- Buick
Special '69 2dr., exc GS400 H.T.
- Buick
Special '70 2dr., conv
- Buick
Special '71-72 2dr.,exc 8-455
- Chevelle
'68-'72 2dr.,exc pickup
- Chevelle
'71-'72 2dr.,H.T.& conv
- Olds F85
'68 2dr.,conv
- Olds F85
'69 2dr
- Olds F85
'70 2dr.,conv
- Olds F85
'71-'72 2dr
- Tempest
'68 2dr.,conv
- Tempest
'69 2dr
- Tempest
'70 2dr.,sdn., H.T & conv exc 8-455
- Tempest
'71-'72 2dr., exc 8-455
Also
remember that Tempest also includes G.T.O. and LeMans. Olds F85 includes Cutlass and 442.
Buick Special
includes Skylark and Gran Sport/GSX.
116"
wheelbase exc. El Camino/Station Wagon and Monte Carlo/Grand Prix
Hollander
Interchange lists the following as a heavy duty replacement for '72 four doors:
- Buick
Special '68 4dr sdn
- Buick
Special '69-'72 4dr.,sdn & H.T.
- Chevelle
'68-'71 4dr.,sdn & H.T.
- Olds F85
'68-'71 4dr., sdn & H.T.
- Tempest
'68 4dr., sdn
- Tempest
'69-'71 4dr., exc. S.W.
- Tempest
'72 4dr., H.T.
The
original type frame interchange for a '72 four door is
- Chevelle
'72 4dr., sdn & H.T.
- Olds F85
'72 4dr., sdn & H.T.
- Tempest
'72 4dr., sdn
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