C2 Jack Compartment Spring

[Dave K.]

I need to purchase a spring for my 66 Corvette jack compartment. The JM calls for a single loop cad or zinc plated spring while the aftermarket supply shop's catalong calls for a double loop spring for the 66-67. Could someone tell me what is correct?

Regards,
Dave Kitch
33108

[Harry Sadlock]

Re: C2 Jack Compartment Spring

If it is a single, try Dr. Rebuild. As I recall that is where I got the single for my 63.

Harry

[Bob R.]

Re: C2 Jack Compartment Spring

I believe the single was only used for the 63's

[Michael H.]

Re: C2 Jack Compartment Spring

I have a single loop hook in my early prod 66 but everyone tells me it's incorrect. Wish I knew for sure.

[Alan Drake]

Re: C2 Jack Compartment Spring

Have single loop in my March 1964 and that's what was in car in 1967. The 64 AIM page D343 shows single.

[Don Z.]

Re: C2 Jack Compartment Spring

It is confusing. The 1966 Judging guide #3 page 31 calls for a spring with a double loop. The 1966 Judging guide #4 page 33 calls for a spring with a single loop. I had a double loop in my March '66 car and lost points in flight judging because it was to be a single loop! I later talked to a guy from Calif. with a March built '66 with a 5 Star Bowtie and is 2nd owner. He says his is original and has a spring with a single loop. Food for thought! Thanks

[Kevin M.]

Re: C2 Jack Compartment Spring

I thought only 67 had double, mine does. I could buy late 66 also.

Kevin

[Jack H.]

Noland has much to say here...

"From 1963 through early 1965, the jack hold-down spring had a single loop on the retainer on its free end. A double-loop retainer replaced the single-loop type on AIM date 10-19-64...."

[Gerard F.]

Were there one or two jack springs?

My late 67 came with two jack springs, both with the double hook and attached to the same point below the jack. I know they are both original as the have the same degree of rust on each. In fact as I was just checking them one broke. Should I now replace one or both?

Jerry Fuccillo
#42179

[Philip C.]

Re: Were there one or two ONE *NM*

[Gerard F.]

Well, I've had two for 37 years

Believe me Phil, I would have had no reason at all to buy a second jack spring and use it. The jack rolled around in the storage compartment for many years among all the other junk I used to store in the compartment. At judging last year for the first time, my interior judge was horrified at my jack compartment and jack, and she wrote "rust,rust,rust,rust" on my score sheet. This area of my 67, is probably the most unrestored area of my car.

Since 68, I always thought that the two jack springs were standard. I wonder if anybody else has come across this.

Jerry Fuccillo
#42179

[Michael H.]

Re: Noland has much to say here...

The change must not have actually occured on the line until much later. I have quite a few very original mid and late production 65 cars on file with the 1st design single hook. Probably be near impossible to nail this down today as most have been changed. The single hook in my 66 is probably incorrect though.

[Gerard F.]

Interesting, the 67 AIM, sheet A5

has a drawing revision date of 5-17-66 (with a release date of 5-18) and shows the spring with a double loop. Yet the Jacking Intructions sticker on my 67 with a date of 5-3-66, shows the single loop. I wonder what the 66 AIM shows prior to May 66?

Even though the Aim and sticker show one jack spring, I still believe my 67 came with two springs, both double loop.

Jerry Fuccillo
#42179

[Michael H.]

Re: Interesting, the 67 AIM, sheet A5

The drawing on the 66 AIM sheet A5 shows the double hook with no record of a part number change. The part number for the spring assembly, which includes the hook, is 3785772, which is most likely the same for 63-67. That part number, numerically, would have been released in about 1960 and was probably also used for some truck or Corvair application at that time. I would have to guess that the original drawing was changed to show the double hook some time during the 65 run but the part change may not have actually showed up in production until some time after that. If it's a safety issue or a problem in production/service, changes occured very close to the AIM date of change but in a case like this spring assy, I would expect the plant would have used up a great deal of existing stock before the change actually showed up on the line. In fact, it could have been an order to "MIX WITH EXISTING STOCK" so there would be no definite end date for the 1st design part.

[Bill W.]

Re: Well, I've had two for 37 years

1966 serial # 23514, bought new by me in June, 1966 still has it's original single loop spring. Could the confusion be tied to body source? My body is A. O. Smith. Bill