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Old 03-30-2023, 06:02 PM   #1
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1985 GMC 350SBC ShortBus Top Speed 50MPH

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!!

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Old 03-30-2023, 07:32 PM   #2
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Year: 1971
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Chassis: International Loadstar 1700
Engine: 345 international V-8
Changing the rear end ratio will give you more top speed if the engine has the power. It does seem like you are also under powered. What condition is the engine in?
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Old 03-31-2023, 11:11 AM   #3
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Year: 2006
Chassis: IC CE300 (PB105)
Engine: DT466e @245hp | Allison 3000PTS
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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.





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Old 04-01-2023, 08:22 AM   #4
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Year: 1991
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Originally Posted by Dbacks2k4 View Post
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.






thats a bus I wouldve gladly owned.. then again im into the BUS part of this much more than the conversion.. ha! love this
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Old 04-01-2023, 10:46 AM   #5
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thats a bus I wouldve gladly owned.. then again im into the BUS part of this much more than the conversion.. ha! love this
Last I heard (by certified mail as the last registered owner, ha ha) the guy I sold it to abandoned it in a Lowes parking lot in Indiana just east of Chicago. It's probably in a scrap yard yet around there somewhere if you want to find it
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