Trailing arm shim�s cotter pin

[Jack J.]

What year did the cotter pin first appear-65, 66, or 67? Thank you, Jack J.

[Leif A.]

What year did the cotter pin first appear-65, 66, or 67? Thank you, Jack J.

I believe it was 1969. No C2 ever came from the factory with the cotter pin. Other than '63 (I believe) which used slotted shims, the C2 used shims with holes in both ends, therefore, no cotter pin was necessary.

[Jack J.]

I believe it was 1969. No C2 ever came from the factory with the cotter pin. Other than '63 (I believe) which used slotted shims, the C2 used shims with holes in both ends, therefore, no cotter pin was necessary.

Interestingly Leif, the used frame I purchased and used for my restoration, 65-67???, had holes for the cotter pin. Obviously, the previous owner drilled them to accommodate the slotted/one hole shims. Thank you, Jack J.

[Thomas F.]

[Joe L.]

What year did the cotter pin first appear-65, 66, or 67? Thank you, Jack J.

Jack-------


Very late 1969 with frame GM #3973880. My original owner, September, 1969-built car has the holes but never had the cotter pins installed.

[Terry M.]

[Richard R.]

[Ray G.]

[Joe L.]

The frame holes appear in the 1969 AIM. However, the cotter pin doesn't begin on the cars until the last week of 1970 production. There are numerous versions of the 1969 AIM and I no longer remember the change date nor have I spent the time to look at enough original 1969s to determine when the holes actually began to appear on the frame.

I have used this information, incomplete as it is, in my Advanced Judging Seminars to illustrate that one should take the AIMs with a grain of salt and study original cars to determine Typical Factory Production.

Terry------

I checked a friend's original owner, un-restored 1969 built in October, 1968. It does not have the cotter pin holes. My original owner, September, 1969 built car has the holes.

[Stephen L.]

[Joe L.]

No holes or cotter pins on my April 67 built 1967 coupe....... frame date 4-7..........

Stephen-------

As expected. There should be no cotter pin holes on ANY pre-1969 frame assuming the car has its original frame. If a pre-1969 frame is found with the holes, either the frame has been replaced or someone has added the holes somewhere along the way.

[Ray G.]

[Joe L.]

Hello;
Please read my last edited post.
Thank all for your input .
Ray

Ray------


Just to be clear, the subject of the original post concerns the frame holes for the shim retaining cotter pins and not the bolts and cotter pins used for forward trailing arm attachment.

For the forward trailing arm attachment, all 1963-82 Corvettes used a special bolt with pilot tip, hole for cotter pin, and a slotted nut. I suppose it's possible that some very early 1963's used some other arrangement, though.

[Ray G.]

Ray------


Just to be clear, the subject of the original post concerns the frame holes for the shim retaining cotter pins and not the bolts and cotter pins used for forward trailing arm attachment.

For the forward trailing arm attachment, all 1963-82 Corvettes used a special bolt with pilot tip, hole for cotter pin, and a slotted nut. I suppose it's possible that some very early 1963's used some other arrangement, though.

Hello;
Could someone post a picture, with arrows of the subject ?
Thank YOU
Ray

[Leif A.]

Hello;
Could someone post a picture, with arrows of the subject ?
Thank YOU
Ray

My picture in post #2 shows how the factory installed the shims from '64 up until '68. In late '69, the factory went to a different style of shim, with a slot on one end and a hole the other. The frame was drilled for insertion of a long cotter pin to retain the shims.