SubySteve wrote:
No, the pinion is not centered like sedan trans. You can mount it upside down and it will work. Your starter and clutch linkage will be on the bottom. It does work.
just wondering,,,and it has probably been discussed,,,,but can't you just flip the bell housing to get the starter and clutch on top?

found this post on another site that may answer my question:
"ran a bus upside down for years, before all the new trans came out, back in the 80`s. I may still have the old bus bellhousing that I used.
Have to reweld the bolt pattern on the belhousing because the top and the botton are spaced different ( the 4 bolts that bolt to the motor). Ran a 400 hp turbo Type 4 motor. It was the 486 R&P ( 5 rib) Bus trans with all FTC gears. Went thru a few R&P over the years but the gears held up. You lose your CV height when you flip it, puts the CV`s higher( I had 13 in of travel). Have to drill holes inside of the top of case, which will be on the bottom when you flip it so the the oil drain thru. In the late 90`s I went to Dave Folts trans that is set up for mid engine, has the larger ring and pinon. Not much more money than a full built bus. I never broken it. "
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If your clutch ain't slippin,, you probably got it adjusted right!!!!!