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Re: [GMCnet] lower steering shaft complete new replacement [message #265658 is a reply to message #265654] Sat, 08 November 2014 14:05 Go to previous messageGo to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
Karen,

I agree with you regarding the upper CV joint. For the record here in New South Wales if you modify the steering in a hot rod the
maximum angle between the steering column and the steering box input shaft allowed is 37°.

When Alex did his seminar on aligning the lower steering shaft at the Chippewa convention someone (I can't remember who) mentioned
that Saginaw steering box tolerances to keep the wheels from wandering was tightest when it was on center. I have absolutely NO
documentation to prove that statement is correct but it stands to reason because when you turn the wheels are "loaded" in the right
or left turn direction which would move any component in that direction as you started the turn.

I don't know if I explained what I was trying to say above clearly, I hope so.

Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426


-----Original Message-----
From: KB

Interesting point. My current theory is that they used a CV joint at the top because it can handle bigger angles than most
u-joints, so could apply to more vehicles. I think the non-linear u-joint response you mention helps explain why it's so critical
to get the steering shaft aligned correctly to the center of the steering box.

Two u-joints, phased correctly, mostly counteract each other and act more like a CV joint.
I wonder if having a u-joint at the top, phased with the lower joint, would help counteract the non-linearity of the lower u-joint?

If we added a third u-joint (a double at the top, a single at the bottom), we'd have to add an intermediate support,
which adds more complexity than I'd want to deal with.

just thinking out loud...

Karen
1975 26'

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
 
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