Rob,
I too, was told by Max Pardy the shop foreman at Buskirk's that the Trans Governor was unique to the GMC motorhome 425 transmission. I bought a new one that I have carried for a spare for a long time and I have several that came out of a motorhome transmissions and one out of a 67 or 68 Toronado trans. I have always paired my governors with the transmission that I have had rebuilt. I don't believe that this governor would be usable without be recalibrated for the motorhome transmission version and the motorhome transmission does have somewhat different internals. It would be best to ask Jim K or Manny on the suitability or this piece.

JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30' Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Nov 17, 2017, at 9:14 AM, Rob Mueller wrote:
>
> G'day,
>
> Unfortunately neither P/N 8625458 nor P/N 8626853 are listed in Parts Book 78Z for our governor. I do not know if it would work or
> not.
>
> See Parts Book 78Z, page 17-3
>
> 8627597 GOVERNOR-trans. (used w/8627428 & 8627737 trans, assy.)
>
> 8629093 GOVERNOR-trans. (used w/8629034. 8629289. 8629429 & 8629631 trans, assy.)
>
> 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 Chris S.
> Sent: Friday, November 17, 2017 7:32 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] New governor assembly for sale
>
> Saw this available on Ebay... pricey but would provide as a nice on board spare:
>
> https://www.ebay.com/itm/NOS-TH-425-Governor-for-1968-69-Oldsmobile-8625458-see-description-below/132395302212?hash=item1ed35ffd44:g
> :4p8AAOSwW6BaBxvi
>
> --
> Chris S. -
> 77 Kingsley, 3.70 FD, mostly OEM -
> S.E. Michigan
>
>
>
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