Have a very high milage (190000) '94 m/h. Just replaced all the ball joints and control arm bushings and ahafts. This corrected a couple of squirrely things, However I think I'm getting a bit of 'wander' at freeway speeds that I didn't have before. I don't have the alignment settings it left the shop with. But it acts like it could use a bit more caster. According to the old Chevy Motor Home service book it should have about 3.5 degrees for the BC dimension it has. Any one with experience with this issue?
Bill, I read information that supposedly came from Robert Henderson (Henderson Line-up), that said 4-5º of caster and strong toe-in like mentioned in the previous post. It's generally accepted that the OEM didn't recommend enough caster.
There is no one setting that is right for every coach.
Be sure the alignment guy uses motor home specs and not potato chip truck specs. First, you need to assure that the frame rails are level. This can be accomplished by adjusting the rear suspension if you have rear helpers or rear air bags, or adjusting the front air bags. Just be sure that your front bump stop clearance is between 1 3/4 and 2 1/2 inches. Then adjust the rear ride height to level the frame rails. Then, and only then, have your alignment done.
If your alignment guy is really good, he can compensate the caster for a sagging rear, but you should really correct it first. Remember the front and rear ride heights and keep the coach that way. IPD and Supersteer have good specs, too. Lots of caster.
Ditto on the Panhard rod.
NOTE: Any incorrect spelling is intentional to prevent those annoying popups.
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I was just pondering last night where can you get alignments for MH's? I just picked one up and noticed the steering wheel wasn't straight when going down the road and it had a little wandering. I didn't know if it was normal or my newness in driving one. My wife followed me and called me asking me what is wrong with my driving but it was also windy.
03 Ford Excursion Ltd 6.0L ARP studs/HG, 6.4L banjo bolts, blue spring mod, coolant filter, K&N CAI, turbo back exhaust, IDP tunes, SCT Livewire
00 Acura RL
08 Jayco 31 BHDS G2
96 Regal 258 Commodore