63-82 Lower Rear Shock Nut

[Joe L.]

Recently, there was a thread regarding the lower rear shock attaching hardware. The cup-shaped retainer was natural steel. The lockwasher was natural steel. The special nut, GM #3691530, was as pictured below. This nut is 0.715" in length and 3/4" across-the-flats. It is GM-discontinued.

[Edward J.]

Re: 63-82 Lower Rear Shock Nut

Joe, the 70-72 JM calls out for the concave lower washer as gray phosphate and black colored split washer, maybe there were a few exceptions?

[Joe L.]

Re: 63-82 Lower Rear Shock Nut

Joe, the 70-72 JM calls out for the concave lower washer as gray phosphate and black colored split washer, maybe there were a few exceptions?

Edward------


I have never seen the cupped (concave) retainer anything but bare steel. I have many NOS examples that are bare steel and the originals on my 1969 were bare steel.

The split lock washer was "plain" finish. "Plain" finish varies from natural, shiny steel to a dark brownish coloration. Most such pieces are the dark brownish color, though. I have never seen any fastener of "plain" finish that was decidedly black, though.

[Edward J.]

Re: 63-82 Lower Rear Shock Nut

Maybe just another Judging manuel era.

Does your lower shock nut have any marking, The ones on my 72 have some markings on one of the flats of the nut that look like a arrow heads.

[Patrick N.]

Re: 63-82 Lower Rear Shock Nut

Had the rear shocks off tonight so here are a few more.

the crusty old nut was "original" on the car but measures .68" The others are various ages, but all measure within 0.64" -0.69". all are 0.75" wide.

Is the 0.715" dim what it should be?

P.S. no markings on originals.

[Rich P.]

Re: 63-82 Lower Rear Shock Nut

I have hundreds and hundreds of these original nuts removed from cars and only a hand full had any markings. The marking is similar to the weatherhead marking on brass fittings. It is a W inside a triangle.
I agree with Joe, bare steel cup and plain washer.

Rich

[Rich P.]

Re: 63-82 Lower Rear Shock Nut

Here is a very old set of NOS shock nuts I had with the markings.

[Edward J.]

Re: 63-82 Lower Rear Shock Nut

Rich, thats the marking on my 72, with the zinc plating.

[Lawrence M.]

Re: 63-82 Lower Rear Shock Nut

When I read this thread and saw the shock nuts with the arrow markings it rang a bell. I went out to check my car, but no markings on the shock nuts. Still, I thought I remembered seeing those markings. I went through my old parts and sure enough there were the shock nuts with the arrow marks I took off when I replaced the shocks about 13 years ago. Since I'm going to have the car Flight Judged, I'll put them back on.

Larry

[John D.]

Re: 63-82 Lower Rear Shock Nut

The post Joe Lucia was referring to concerning the rear shock hardware was for a 64. Alan asked the question Joe.

So just what is the plating of the shock nut? Bare, zinc, cad or what?
Meanwhile are you all saying that 63 to 82 rear shock hardware was all finished the same way?
Rich's nice photo shows the nuts as being shiny.
Joe Ray told me that on a 63 zincad was incorrect!!! JD

Found the original rear shock nuts that was on my 63 in 1970. Had them in a little plastic drawer marked shock hardware.
Only logo is on the end of them. (not on the hex flats). Logo is: 3 of triangles. Nothing inside the triangles.
Same company made my 63 shock nuts as made the 63 wheel lug nuts.
On my desk there is more car parts than papers lately. I have some original 63 lug nuts that belong to a swamp guy. They have the little triangles on the very ends.
And to repeat the same triangle-only larger ones- appear on the original shock nuts.
I have no clue what's on my car though. z
My 63 only has 30,000 on it. These 63 nuts don't appear to have been plated. They appear to have been bare.
Maybe RJ will chirp in here. I imagine the part number is the same for 63 to 82 on the nuts otherwise Joe wouldn't have stated it that way. Right Joe??? JD

[Joe L.]

Re: 63-82 Lower Rear Shock Nut

The post Joe Lucia was referring to concerning the rear shock hardware was for a 64. Alan asked the question Joe.

So just what is the plating of the shock nut? Bare, zinc, cad or what?
Meanwhile are you all saying that 63 to 82 rear shock hardware was all finished the same way?
Rich's nice photo shows the nuts as being shiny.
Joe Ray told me that on a 63 zincad was incorrect!!! JD

Found the original rear shock nuts that was on my 63 in 1970. Had them in a little plastic drawer marked shock hardware.
Only logo is on the end of them. (not on the hex flats). Logo is: 3 of triangles. Nothing inside the triangles.
Same company made my 63 shock nuts as made the 63 wheel lug nuts.
On my desk there is more car parts than papers lately. I have some original 63 lug nuts that belong to a swamp guy. They have the little triangles on the very ends.
And to repeat the same triangle-only larger ones- appear on the original shock nuts.
I have no clue what's on my car though. z
My 63 only has 30,000 on it. These 63 nuts don't appear to have been plated. They appear to have been bare.
Maybe RJ will chirp in here. I imagine the part number is the same for 63 to 82 on the nuts otherwise Joe wouldn't have stated it that way. Right Joe??? JD

JD-----


The part numbers for the nut, lock washer and retainer were the same from 1963 to 1982.

[Timothy B.]

Re: 63-82 Lower Rear Shock Nut

Are these rear shock nuts the same part# as the 63-5 upper control arm attaching nuts where the shims go??

[Rich P.]

Re: 63-82 Lower Rear Shock Nut

Are these rear shock nuts the same part# as the 63-5 upper control arm attaching nuts where the shims go??

Tim,

I never checked the pt # but the shock nut is 1/3 larger than the alingment nut. What would be a closer match is the rear camber adjusting bolt nut.

Rich

[Edward J.]

Re: 63-82 Lower Rear Shock Nut

Tim, I believe those control arm nuts were a self locking type,as the shock nuts were not, as Rich says they were different thickness also.

[Rich P.]

Re: 63-82 Lower Rear Shock Nut

Tim, I believe those control arm nuts were a self locking type,as the shock nuts were not, as Rich says they were different thickness also.

Hey ED,

not too many people know that the 63-65-ish cars used a longer stud with a lock washer and regular nut and 66-ish to 68 used a shorter stud with a lock nut. Then in 69 they went to a coarse thread stud with a lock nut.

Rich