Difference in K-frame? (440 vs RB)

[erickson]

when we redo K members to Hemi we add the coin stamped

 

[LSS&B]

'68 or "early" '69 (no '70-style bushing bracket bolt holes punched in the top shell half, so not "late" '69; and not '70).
But the most notable thing about your sway is that it is installed upside-down - the "hump" goes up, not down (should be above the k-to-radiator brace). That's why only one bolt of your k-frame bushing mount brackets "hit" for each one. The way it faces probably doesn't matter much...but a bolt to nothing sure seems that it would?

There's a date code stamped into the front vertical face of the K-member if you really want to know; right around the middle and takes some wire brush work to see usually. Look for a bit of a depression where the metal caved in slightly from the stamp-strike.

The 'coin' is just a small oval sheet metal plate - maybe 16ga or so - that's tack welded to the front of the K-frame and is stamped with the last two digits of its part number to identify it for the assembly line. Most K-frames I've personally seen do not have a coin.

Hi Mark
K-frame: What are the bushing brackets for in the 1970 K-frame? Still learning, thanks
Sway Bar: I bought the car on 2025-01-16. I did not install sway bar. I agree about it being up-side-down. Another item for the to-do list.
Date: I looked last night, but paint may be covering it. With so many other things going on, I'm not going to worry about it.
Coin: Thanks, that explains it! Ben

 

[MarkLevi]

...bushing brackets for in the 1970 K-frame?

Different shape, length and all mounting points. I concocted a reference sketch on an image lifted from an aftermarket (Hellwig?) that's pretty much the same as stock. (I am grate artiste... LOL -NOT)

Edit to add a tidbit:
Images lifted from others' threads on here showing lower control arms' sway bar tabs relative positions for the two different vintages.