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Board consensus seems to be that the slightly taller spindles from F, etc, bodies are OK, maybe even better.
Mopar Action's Rick Ehrenberg disagrees, although in this case I believe he is too married to Ma Mopar to see the truth.
Just my opinion, Rick!

R.



By actual measurement, the taller knuckles almost triple the bumpsteer.

This has been discussed ad infinitum. if you're just cruising to McDs, you'll probably never notice, I agree. But I see no reason to knowingly 'do it wrong'. Neither did MaMopar, who could have standardized on one knuckle forging and saved $$$ -- but did not.

Rick



So, what causes bumpsteer?

Hint, it ain't spindle height.

So, if Ma didn't standardize on one spindle, why do the 73 and up B's, all R's, J's, F's, M's and so forth use .... the same spindle? Even though some are longitudinal t bars suspensions and some are transverse?

Just waiting for some clown to say "isoclamp".

Oh and overangling the ball joint is BS too.

Here's some facts for you rather than someone's off the cuff nonsense.

http://www.bigblockdart.com/techpages/spindles.shtml



The factual answer is simple. For the 1973 B-body, with the rubber-isolated K-member, the UCA-to-LCA-pivot dimension increased (see graphic below), this required the taller knuckle. This same basic design was used on F, J, and M-cars, too, despite the bent-bar configuration. Excepting the 1973 rubber isolation, which prevents the K from performing its original intended purpose (tying the lognitudinals together), requiring their mass to be significantly increased, the geometry on the 1973s in fine as-is. (I have no doubt that using the short knuckles on a isolated-K car would also cause handling problems).


The site you quoted above does, in fact, show much more toe change (bumpsteer) when using the incorrect knuckles: 0.081" for the correct knuckles vs. 0.199 for the taller knuckles. Therefore, going with those numbers (I have measured greater variation) I stand corrected - there's only about 2.5 times the bumpsteer with the taller pieces.

Rick