Originally Posted by Bus4BlackSh33p
I have a 1985 gmc with the chevy 350 sb and a muncie sm465 my top speed is 50 mph running at 3000 what can i do to get like 10-15 more mph out of this thing??i want to drive it to arizona but it takes about a whole two minutes to actually reach my top speed id really like to find another manual transmission that can handle and fit the duties of this bus any help would be awesome and greatly appreciated ..thanks!!
I used to have an 87 GMC Bluebird with the 366 and an Allison 4-speed automatic (not even sure what model anymore). No idea what the gear ratio was. That thing was a clunker. Way too small of an engine for a 35 foot bus, we topped out at 55 on flat ground and 62 going downhill with a tailwind.
Mine had a failing carbeurator which impacted performance and it didn't run worth crap cold, liked to stall. I'm not familiar with the muncie but top speed is a factor of engine capability, gear ratios as well as transmission.