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Re: [GMCnet] lower steering shaft complete new replacement [message #266806 is a reply to message #266594] Wed, 26 November 2014 14:52 Go to previous messageGo to previous message
KB is currently offline  KB   United States
Messages: 1262
Registered: September 2009
Karma:
Senior Member
Just as a related side note, I was studying Don Wirth's excellent article about the steering box:
http://www.gmceast.com/technical/Wirth_GMCMH_Steering_Box.pdf

In it, he asserts that our steering box has a 3/4" 24-spline shaft. (I assume he meant 3/4"-30, with 6 missing for the flat).
This confused me, so I double checked ours, which for sure is a 13/16"-36 spline shaft, just like Jim Fawcett found with his.

Don's test for checking the size is correct: a 3/4" 12-point socket WILL fit on a 13/16"-36 splined shaft just fine.
To test for a 3/4" shaft, you actually need (I think) an 11/16" socket because the teeth of the socket fit into the
grooves of the spline, which is a smaller diameter circle. The 3/4" boxes are more common since the 13/16" size was only
used up until about 1977.

At any rate, if you went to a junkyard armed with Don's suggestion on checking shaft sizes using a 3/4" 12-point socket, you'd be fine.
However, if you just ordered a steering box with a 3/4" shaft based on his article, you'd never be able to get your OEM steering pinch bolt
tightened correctly on the steering shaft. Made me wonder if there might be a few GMC's out there with wrong size steering boxes,
and also if any 1978 coaches were equipped with the later sized boxes.

Karen
1975 26'




USAussie wrote on Sun, 23 November 2014 17:55
Keith,
From research I've done on the steering box and discussions I've had with Dave Lenzi I am of the OPINION that any amount the
steering box is off center is going to cause steering wander.

While I'm down in Adelaide working with Peter Bailey I'll see if we can figger out how to determine how many degrees it takes for
the steering to get sloppy.


 
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