64 spindle support

[Joep F.]

I am restaurating the rear suspension of my 64 C2. After dismantling I found little differences between rh and lh rear suspension. For instance both spindle supports have serial number 3820643N. However left is dated L72, right is dated F147. Also there is a small difference in the brake drums. One has a wider ledge then the other. Anybody any clue, what this means and what the date codes mean?

Thanks, Joep

[Duke W.]

Re: 64 spindle support

The number on the spindle support is the casting number and the "N" may stand for "nodular" - nodular iron. Joe will likely offer more insight.

It's possible that both supports are replacements, assuming the letter stands for the month, then the one or two digit day of the month with the last digit being the year, but "L72" is too early unless it's a 1972 replacement. If the rear wheel bearings fail the support is sometimes damaged.

What are the brake drum casting numbers?

Duke

[Wayne M.]

Numbers off a January '64 car

... with a diff assy stamping CF_1_3_64.

Spindle support cast #s same as you show, but with cast dates L_7_3 (Dec 7th '63) and A_6_4 (Jan 6th '64). Seems, like Duke has said, that your spindle supports have been changed. This casting # was used for a MANY years.

My drums: 3828688 with "W12" on one and "W8" on the other.

[Joe L.]

Re: 64 spindle support

Joep-----

The spindle supports are replacements. One was cast December 7, 1972 and the other was cast June 14, 1967.

[Harry Sadlock]

Re: 64 spindle support

Joe, I just pulled two supports from my pile. Both are dated (L 7 3) or Nov. 7, 1963. They are both 8820843N. The one I have marked left is cast GM8 and the one I have marked right is GM2.

After looking and measuring I can't figure why one is left and one is right?

Thoughts please.

Happy Holidays

Harry

[Harry Sadlock]

Re: 64 spindle support

Joe, I just pulled two supports from my pile. Both are dated (L 7 3) or Nov. 7, 1963. They are both 8820843N. The one I have marked left is cast GM8 and the one I have marked right is GM2.

After looking and measuring I can't figure why one is left and one is right?

Thoughts please.

Happy Holidays

Harry

[Wayne M.]

L & R because of shock mount

if both spindle supports were machined the same, the lower shock mount would face towards the tire one one side of the car. There's a flat machined on mount and on the shock shaft to ensure proper installation.

[Wayne M.]

L & R because of shock mount

if both spindle supports were machined the same, the lower shock mount would face towards the tire one one side of the car. There's a flat machined on mount and on the shock shaft to ensure proper installation.

[Harry Sadlock]

Re: L & R because of shock mount

Wayne, thanks. I just measured the diameter of the shock mount hole and they are infact different one is about 57/100 and the other is about 64/100.

Harry

[Harry Sadlock]

Re: L & R because of shock mount

Wayne, thanks. I just measured the diameter of the shock mount hole and they are infact different one is about 57/100 and the other is about 64/100.

Harry

[John H.]

Re: L & R because of shock mount

Harry -

Also, the forward hole on each side has a "flat" keyed to match the one on the shock mount stud that determines angular orientation (the studs are RH and LH parts too, for that reason).

[John H.]

Re: L & R because of shock mount

Harry -

Also, the forward hole on each side has a "flat" keyed to match the one on the shock mount stud that determines angular orientation (the studs are RH and LH parts too, for that reason).

[Harry Sadlock]

Re: L & R because of shock mount

John, I can't wait till next week. I'll turn 60 then the case of CRS I got when I turned 55 will be cured!!!

Thanks

Harry

[Harry Sadlock]

Re: L & R because of shock mount

John, I can't wait till next week. I'll turn 60 then the case of CRS I got when I turned 55 will be cured!!!

Thanks

Harry

[Joe L.]

Re: L & R because of shock mount

Harry-----

I think you'll find that the number is actually 3820643. That's the casting number for the 63-74 spindle support. Some 63's differ in that they have no "webbing" between the forks as do later. While the CASTING used for both sides is the same, there were different FINISHED PART NUMBERS for the left and right supports due to the machining difference described by Wayne and John. Of course, the finished part numbers often appear nowhere on the part. But, as it turns out, in this case one of the supports does have the finished part number on it. That's because the CASTING number and the FINISHED PART NUMBER for the left side support happen to be the same----3820643. The right side support is the one that doesn't have its part number on it-----GM #3820644.