| Re: [GMCnet] Dave Lenzi's modified upper A arms to increase caster. [message #328258 is a reply to message #328246] |
Mon, 15 January 2018 18:56   |
sgltrac
Messages: 2797
Registered: April 2011
Karma:
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Senior Member |
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In My 77 royale with stock upper arms and offset upper bushings I was able
to get a pair of fives for castor and it was a two finger driver pulling a
trailer.
And a sullybilt rear suspension kit.
Sully
77 eleganza 2
Bellevue.
On Mon, Jan 15, 2018 at 12:45 PM Rob Mueller
wrote:
> Bob,
>
> The max caster possible on Double Trouble with Moog offset bushings in the
> rear positions of the upper control arms was 1.9 and 2.0
> degrees. It wandered. After installing a set of Dave's upper control arms
> in Houston I was able to get 6.0 degrees which I dialed
> back to 5.0. Double Trouble now steers like it was on rails.
>
> HOWEVER, I had NOT checked the steering box to determine if it was on high
> center before I installed Dave's upper control arms.
>
> As I understand it on later coaches (77 & 78) changes were made and it is
> possible to get more caster. On the 77 Kingsley John
> Sharpe and I completely rebuilt the front end and installed Moog offset
> bushings. We also set the steering box on high center.
> Unfortunately we ran out of time (I was flying back to Sydney) so we
> didn't have time to align the front end so I can't tell you how
> much caster was possible. I won't be able to provide that info until I
> return to Houston (March 27).
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Bob
> Dunahugh
> Sent: Tuesday, January 16, 2018 4:59 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Dave Lenzi's modified upper A arms to increase caster.
>
> This replacement 78 Royale drives better then our last one. I pulled
> Dave's knuckles, relay arm, idler arm, and the new steering
> wheel slip joint out of the burned Royale. Plus the upper A arms that had
> the offset rubber bushings installed. Already installed
> the knuckles. Not the relay, idler arm, or slip joint yet. Thinking of
> putting in the reworked A arms that Dave makes. Caster is
> extremely important for having the GMC drive perfectly straight. His pair
> of A frames are about $750. Thinking that I'll order
> some from his next run later this year. Any input out there? Bob
> Dunahugh. 78 Royale
>
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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