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12-10-2008, 05:15 PM
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#1
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Skoolie
Join Date: May 2007
Location: Michigan
Posts: 100
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Got to go faster.
I have a local truck shop that I have visited to get some ideas from. My bus has a 5.9 Cummins with 4.63 in the rear. They say they can find a better rear for me for six hundred including labor. They were thinking a 4.10. Wound this work for what I want to do?
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12-10-2008, 06:45 PM
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#2
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Bus Geek
Join Date: Oct 2005
Location: Clearlake, Northern California
Posts: 2,511
Year: 1992
Coachwork: Blue Bird
Chassis: TC-2000 Frt Eng, Tranny:MT643
Engine: 5,9 Cummins
Rated Cap: 84
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Re: Got to go faster.
You can make calculations in a jiffy with this:
http://www.idavette.net/tech/ratioc.htm
Simply go to that site and punch in any three of the four numbers, then hit "compute" for the fourth. Magic!
__________________
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12-10-2008, 06:59 PM
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#3
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Bus Nut
Join Date: Jul 2005
Location: Grand Rapids, MI
Posts: 786
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Re: Got to go faster.
try one of these calculators and see how much that'll affect your RPM's http://www.corral.net/tech/gearcalc.html
4.63 to 4.10 doesn't seem much difference
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12-10-2008, 09:01 PM
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#4
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Bus Geek
Join Date: Feb 2006
Location: Saint James, MN
Posts: 2,669
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Re: Got to go faster.
In theory he should be able to hit darn near 80 mph at 2600 RPM assuming he has 10.00R20/11R22.5 tires. That's also not including any tranny slippage. I think 70-75 mph would be doable. That might be worth the $600. The $600 is parts and labor? If so you're getting a deal. I've done some rear ends for smaller stuff and by the time you get a master bearing kit, shims, and the actual gears you can be in it for $250. If you add in the $100-$200 labor (going rate on rear ends) and you aren't but a few bucks short of what they quoted you for a much larger, heavier rear end.
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12-11-2008, 10:12 AM
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#5
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Bus Nut
Join Date: Nov 2008
Location: OROVILLE, NORTH CENTRAL, WASHINTON
Posts: 295
Year: 1974
Coachwork: CARPENTER
Chassis: GMC-6000
Engine: 454 CHEVY
Rated Cap: 66
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Re: Got to go faster.
I WANT TO SWOP THE THERD MEMBER IN MY GM T170 TWO SPEED REAR END
MOTOR CHEVY 454
TRANS NP465 FOUR SPEED
TIRES 9.00 X 20
REAR END GEARS ???????
DO'S ENONE KNOW WERE I CAN FIND A THERD MENBER THAT WILL LET ME
DO UP TO 75 - 85 mph ?
CAMO-MONSTER
__________________
CAMO-MONSTER, 454, sm465, gm t170
the BEAST, 350, 4 sm465, np205,
hd d44 4.56, eaton ff 4.56
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12-11-2008, 01:23 PM
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#6
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Bus Nut
Join Date: Nov 2008
Location: ellijay ga
Posts: 560
Year: 94
Coachwork: b/b
Chassis: tc2000
Engine: 5.9
Rated Cap: 72
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Re: Got to go faster.
ok i got a 5.9 cunni with a at 545 with a478 rear and i want to run about 65to 70 and they say i can't turn it up ,,it runs right about 58 to 60 on the hiway ,now this is a 94 bb 5.9 12 vale pump i feel the need for some speed,,,, help or should i sell it,,, now this was told to me by 4 diff cunnins men ,you can't turn it up... HELPPPPPPPPPPPPPPPPPPPP
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12-11-2008, 05:33 PM
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#7
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Bus Crazy
Join Date: Jul 2002
Location: Central Iowa
Posts: 1,839
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Re: Got to go faster.
Quote:
Originally Posted by the_experience03
In theory he should be able to hit darn near 80 mph at 2600 RPM assuming he has 10.00R20/11R22.5 tires.
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And assuming it has the power to overcome drag and grade!
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12-11-2008, 11:25 PM
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#8
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Bus Nut
Join Date: Jul 2005
Location: Grand Rapids, MI
Posts: 786
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Re: Got to go faster.
I have the same engine in my bus, with a 4.33 rear end and I can hit 77mph. Not sure what my RPM's are though since I have no tach. I'll tell ya though, I usually cruise 60-65 because fuel economy gets real bad above that.
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12-12-2008, 12:19 AM
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#9
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Mini-Skoolie
Join Date: Dec 2008
Posts: 50
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Re: Got to go faster.
Just make sure you're never going to need low gear to get moving on a steep grade with a heavy load... ever. Busses have low gears for a reason!
It sucks that the transmission doesn't have enough gears, with a wide enough ratio spread.
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12-12-2008, 02:56 AM
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#10
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Bus Nut
Join Date: Nov 2008
Location: OROVILLE, NORTH CENTRAL, WASHINTON
Posts: 295
Year: 1974
Coachwork: CARPENTER
Chassis: GMC-6000
Engine: 454 CHEVY
Rated Cap: 66
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Re: Got to go faster.
Quote:
Originally Posted by Joe Monstermaker
Just make sure you're never going to need low gear to get moving on a steep grade with a heavy load... ever. Busses have low gears for a reason!
It sucks that the transmission doesn't have enough gears, with a wide enough ratio spread.
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THAT IS WHAT MITE BE GOOD ABOUT MY REAR END WHICH
IS A TWO SPEED.
BUT I STILL WOULD LIKE TO TRY AND FINED HIGHER GEARS
FOR MY DIFF.
CAMO-MONSTER
__________________
CAMO-MONSTER, 454, sm465, gm t170
the BEAST, 350, 4 sm465, np205,
hd d44 4.56, eaton ff 4.56
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