ORIGINAL '66 UPPER "A ARM" ATTACHMENT

[Rob A.]

Are the upper a arm shafts secured to the bolts that hold them to the frame with "tall nuts and lock washers" per the JM, as opposed to the large crimp nuts in '67?

[Rob A.]

ADDENDUM

Are the nuts and lock washers bare steel or plated?

[Joe L.]

Re: ORIGINAL '66 UPPER "A ARM" ATTACHMENT

Rob-----

Yes, standard nuts with lockwashers were used for 1963-66.

[Michael H.]

Re: ORIGINAL '66 UPPER "A ARM" ATTACHMENT

Not 100% sure about this but I seem to remember mid or late 66 switching to the crimp style nuts that were used in 67. Maybe someone that has an original late 66 can verify?

[Joe L.]

Re: ORIGINAL '66 UPPER "A ARM" ATTACHMENT

Michael-----

Yes, the nuts did change sometime in 1966. From what I can tell, it actually looks like it could have been fairly early 1966.

[Michael H.]

Re: ORIGINAL '66 UPPER "A ARM" ATTACHMENT

Ok, thanks Joe. I thought so but wasn't sure. I know the HD nut/lock washer was used at least through November but couldn't remember when it changed to the prev. torque style.

[Rob A.]

Re: ORIGINAL '66 UPPER "A ARM" ATTACHMENT

Mike,

The lower a-arm shafts on my car are also attached in the rear with lock washers and nuts, like the upper a-arms. They appear to have never been removed. My car has a June(66) build date.

[Michael H.]

Re: ORIGINAL '66 UPPER "A ARM" ATTACHMENT

Rob,

If they look original, then they probably are. I'm not 100% certain that either the upper or lower nuts changed to the prev torque style, or when it happened if it did, but I seem to remember the uppers changing late in the year. Hopefully, others with later production 66 cars will help sort this out.

[William C.]

Re: ORIGINAL '66 UPPER "A ARM" ATTACHMENT

Were the crimp nuts not also associated with a coarse thread design for the pressed-in bolt from the frame, or did that change come later as a third iteration?

[Joe L.]

Re: ORIGINAL '66 UPPER "A ARM" ATTACHMENT

Bill----

For later 1966 and 1967 Corvettes, the Stover-type lock nuts were used with the 7/16"-20 (NF) bolts. For 1968-82, the bolts changed to 7/16"-14 (NC) and similar Stover-type lock nuts were used.

[Gary B.]

'66 UPPER "A ARM" nuts for late build date

Rob,

The nuts on my July 20, '66 build date car are indeed the "tall" nuts, about 7/16" thick. Not the prevailing torque nuts, just the regular style (but tall) with a lock washer as per the TIM&JG.

Gary

[Rob A.]

Re: '66 UPPER "A ARM" nuts for late build date

Gary,

Do you happen to know if they were bare steel or plated? Thanks...