[66tempestcustom]

Does anyone know what year and models will interchange frames with a 66 Catalina? Just bought one and didn’t realize how bad the frame was.

[63gpman]

2 door? 4 door?

For sure 65 and 66 Catalina 2 dr and convertible as well as Grand Prix. Thought I did hear that the wagon frame is the same somewhere also.

[66tempestcustom]

Mine is a 4dr HT. I keep seeing conflicting info where the 4dr and 2dr are different or the same.

[Ragtop Man]

Floor pans interchange - assume the 2/4 door frames will as well.

Convertible frames, in addition to being boxed for strength like GP have an extra pair of body mounts compared to sedans.

While not absolutely necessary, a few folks have said the extra stiffness of adding the mount and bolt to a closed body produced a noticeable improvement in ride and handling.

Think if you could score a dry convertible frame for same year, that would be the best option for you. Clean it up, replace stuff while it is easy, then slam it back together.

[694.1]

Any frame shop should have access to cad drawings of the frames, this would tell you everything you want to know & more.
Good luck!

['ol Pinion head]

The three '66 Cats (1 4door sedan, 2 two door hardtops) I've parted all had straight solid frames & from each of them, the frames went north and then were assembled under '66 Cat 2 doors. 66 Cat 2 door & 4 door use same frame. Memory serves right, '66 GP used the same frame as well. Have never owned a '66 Cat wagon. '66 Exec & Bonne use 3" longer wheelbase frame.

[63gpman]

9782401 7.003 5237-39,5437 exc. H.D.. FRAME 1 1966 1966 7-1

9779170 7.003 5211-69 FRAME ASSEMBLY 1 1965 1965 C-14
9729170 7.003 5237 exc. H.D FRAME ASSEMBLY 1 1965 1965 C-14

9782403 7.003 5235-45,6245,6657 H.D. FRAME 1 1966 1966 7-1
9782401 7.003 5237-39,5437 exc. H.D.. FRAME 1 1966 1966 7-1

Just spoke with a friend of mine that has an interchange software. The info was a little odd in that it lists 65 and 66 as not interchanging (think minor differences on them, but should work) On 65 it lists HT, SW and 4dr as the same for Catalina, but 66 it had differences. Also shows GP and vert only and not interchanging, but we know that you can put a GP under a Catalina and would be considered HD. Anyway, just posting some of the frame part numbers above for ref.

[63gpman]

Some more part numbers, almost have to look at this with the "if this, than that" theory since there is some clear overlap, but different numbers.

9782402 7.003 5211-69 exc. H.D ........ FRAME 1 1966 1966 7-1
9782407 7.003 5211-37-39-69,5437 H.D. exc. Stageway FRAME 1 1966 1966 7-1
9782407 7.003 5235-45,6245,6657 exc. H.D FRAME 1 1966 1966 7-1
9782403 7.003 5235-45,6245,6657 H.D. FRAME 1 1966 1966 7-1
9782401 7.003 5237-39,5437 exc. H.D.. FRAME 1 1966 1966 7-1
9782403 7.003 5267,5467 .............. FRAME 1 1966 1966 7-1
9782403 7.003 5269 Stageway ......... FRAME 1 1966 1966 7-1
9782405 7.003 56,6237-39 exc. H.D ..... FRAME 1 1966 1966 7-1
9782406 7.003 56,6237-39 H.D ......... FRAME 1 1966 1966 7-1
9782406 7.003 6267 or H.D.C ........... FRAME 1 1966 1966 7-1

Model numbers For 66 Catalina and 2+2 models

25269 4d Sedan - 6P $2,831 3,785 lbs 80,483
25239 4d Hardtop - 6P $2,968 3,910 lbs 38,005
25211 2d Sedan - 6P $2,762 3,715 lbs 7,925
25237 2d Hardtop - 6P $2,893 3,835 lbs 79,013
25267 2d Convertible - 5P $3,219 3,860 lbs 14,837
25245 4d Station Wagon - 9P $3,38? 4,315 lbs 12,965
25235 4d Station Wagon - 6P $3,217 4,250 lbs 21,082

Catalina 2+2 Series 254
25437 2d Hardtop - 5P $3,298 4,005 lbs 6,382 Total
25467 2d Convertible - 5P $3,602 4,030 lbs

[63gpman]

Let me know if that info helps. I can try to search some more if needed.