Home » Public Forums » GMCnet » [GMCnet] sreering
| Re: [GMCnet] Re: sreering [message #367408 is a reply to message #367391] |
Sat, 30 October 2021 00:01   |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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I, like everyone else here so far, am not going to answer your steering box 2.5 turn question because I do not know for sure.
I have known several GMC people who have replaced or had their box rebuilt only to find out it did not help much. I believe the box ought to work if the ratio is close to correct. The 2.5 turns is simply where the internal stops are located in the box. Unless there is a lot of wear in it causing excessive slop then there probably is no real reason to replace / rebuild the box.
It sounds like you have tried a lot of things. I did the same thing on mine. The biggest things that helped me was replacing the idler arm. There was a lot of wear / play in the arm bushing to mounting bolt. I put Dave Lenze's bearing type arm in instead of the older bushing type.
The next was replacing the worn and rotted lower control arm bushings with Energy Suspension Urethane bushings and at the same time put offset upper control arm bushings for more caster.
The next was setting the ride height EXACTLY correct. The ride height is not really the important thing, it is getting the weight on each pair of wheels nearly equal. Because of the design of the automatic adjusting rear air bags and the front springs (torsion bars) it is very possible to get each pair of wheels with hundreds of pounds difference between them while maladjusting the heights to correct that problem.
While weighing coaches at one of the GMCMI rallies we actually found one coach the was just shy of 800 pounds difference between the two front wheels while the ride heights were very close to correct. The rear diagonal corner from the the heavy front wheel was also about 800 pounds heavy (400 per wheel).
Finally after getting the weights straighten out, getting the rear ride height correct made the biggest difference in handling I found that some PO liked the rear riding high. Dropping it to the GMC spec made a huge difference.
The last is tire pressures. Airing tire pressures according to the weight on each also makes a large difference in handling. Micheline has a tire pressure chart on line for our coaches. My wheels and tires all come in at around 62 to 65 PSI for a 26 coach. That makes a big difference in handling instead of using the maximum of around 80 to 85 PSI that some many people use.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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