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Old 08-30-2018, 10:43 AM   #1
Mini-Skoolie
 
Join Date: Aug 2017
Location: Iowa
Posts: 33
Year: 1990
Engine: 6.0L 366 Chevy Big Block
Rated Cap: 47
1990 GM Bus questions

From the VIN it says I have a 6.0 (366ci) Chevy big block with a 4BBL carb on it . It is married to a manual transmission and has a 2 speed readend . Looking for any and all information I can find regarding this configuration . I know that the motor was mostly used in larger trucks, bus frames, and grain trucks . Anyone have service manuals or parts diagrams for any of these ? Also any feedback in terms of these motor would be great too .

1990 GMC Bus
366ci 6L
MT
109K Miles
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Old 08-30-2018, 11:03 AM   #2
Bus Nut
 
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Join Date: Oct 2017
Location: Virginia
Posts: 936
Year: 1971
Coachwork: Wayne
Chassis: International Loadstar 1700
Engine: 345 international V-8
Are you familier with a two speed rear? Kind of rare in a bus, although mine does have one. Great in the mountains lets you split gears. My old dump truck had one and all of my Dad's old trucks had them, learned how to drive them when I was a teenager.
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Old 08-30-2018, 02:51 PM   #3
Mini-Skoolie
 
Join Date: Aug 2017
Location: Iowa
Posts: 33
Year: 1990
Engine: 6.0L 366 Chevy Big Block
Rated Cap: 47
I am not super familiar with a two speed rear-end . From my understand 'high' gear functions as a normal diff would while 'low' gear runs it thru a planetary and slows it down . Any tips on using it ?
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Old 08-30-2018, 05:43 PM   #4
Bus Nut
 
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Join Date: Oct 2017
Location: Virginia
Posts: 936
Year: 1971
Coachwork: Wayne
Chassis: International Loadstar 1700
Engine: 345 international V-8
generally speaking when you are cruising along and a long hill is slowing you down, you move the button on the gearshift from high to low range, then while keeping the gas pedal down push in and out the clutch pedal real fast. To go from low range to high range move button and just ease off the gas and gently reapply power.

A few notes , the speedometer will not show true speed in low range. Also you need to find out how fast you can go in a given gear. Example 5th gear low range might give you 45mph. So if you are in 5th high range and doing 60 then do not downshift until you get down to 45.

On my bus the shifting instructions are riveted to the glovebox lid.
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Old 08-31-2018, 12:25 PM   #5
Mini-Skoolie
 
Join Date: Aug 2017
Location: Iowa
Posts: 33
Year: 1990
Engine: 6.0L 366 Chevy Big Block
Rated Cap: 47
Do you know what manual transmission is in this bus ? I know the automatics are allisions but what i have is a manual .
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Old 08-31-2018, 05:23 PM   #6
Bus Nut
 
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Join Date: Oct 2017
Location: Virginia
Posts: 936
Year: 1971
Coachwork: Wayne
Chassis: International Loadstar 1700
Engine: 345 international V-8
Spicer seems common, but I do not know for sure.
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Old 08-31-2018, 07:46 PM   #7
Bus Crazy
 
Join Date: Jun 2013
Location: Picton,Ont, Can.
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Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
Could be an Eaton.


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Old 09-04-2018, 08:23 PM   #8
Mini-Skoolie
 
Join Date: Aug 2017
Location: Iowa
Posts: 33
Year: 1990
Engine: 6.0L 366 Chevy Big Block
Rated Cap: 47
Interesting . Got rained out on my pick up of the bus last weekend but looking forward to finding out what I got . Any of you got any service info on them ?
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