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10-26-2021, 08:47 PM
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#1
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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60 mph at 2600 rpm
I have a 2000 international 3800 with a dt466e and an allison mt643
I cant figure qhy the rpm are so high at 60mph. I have 4.10 differential.
I was told it should be at 2200 rpm when going 60mph
It seems to shift all gears. I feel a tug when going from 1st to 2nd and one from 2nd to 3rd and finallt one more when 3 to 4th. The only odd thing is that i feel a bump when slowing down fast from 45 mph to a stop sign. Like a little push at the end before it stops completely. Please any help apreciated.
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10-26-2021, 09:13 PM
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#2
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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what size tires does it have?
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10-26-2021, 09:16 PM
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#3
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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Tires arw 11r225
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10-26-2021, 10:24 PM
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#4
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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Mine was 2000 @ 60 mph with 4.1 gears and llr22.5 tires. Have you checked for speedometer and tachometer accuracy? Also are you sure that the torque converter clutch is locking up?
__________________
Why can't I get Ivermectin for my horses?
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10-26-2021, 10:40 PM
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#5
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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Not sure if i would even know if the torque converter was locking up. Not sure what to look for.
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10-26-2021, 10:41 PM
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#6
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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I doubleckecked the tachometer and speedometer with a nexiq reader and servicemaxx
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10-26-2021, 10:43 PM
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#7
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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The shift into 4 gear will be a large drop in rpm compared to the other shifts. 4th gear is only lock up. About 40% change.
__________________
Why can't I get Ivermectin for my horses?
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10-26-2021, 10:44 PM
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#8
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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Is this a front engine or rear engine.
__________________
Why can't I get Ivermectin for my horses?
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10-26-2021, 10:45 PM
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#9
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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Torque converter pistons on these can sometimes crack and leave you without lock up.
__________________
Why can't I get Ivermectin for my horses?
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10-26-2021, 10:46 PM
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#10
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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Your transmission is new enough to have modulated lock-up in other gears.
__________________
Why can't I get Ivermectin for my horses?
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10-26-2021, 10:55 PM
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#11
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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Front dog nose
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10-26-2021, 10:57 PM
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#12
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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So how many drops in rpm should i notice if i go from stop to 55 mph?
Its an allison mt643 qith 4 gears
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10-26-2021, 11:31 PM
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#13
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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Mine drops from about 2500 in 3rd to about 1700 in 4th.
__________________
Why can't I get Ivermectin for my horses?
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10-27-2021, 09:28 AM
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#14
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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Does anyone know how to chexk the modulator and kickdown cable?
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10-27-2021, 09:45 AM
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#15
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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If the modulator cable fails it will short shift. In other words it will not rev up to the limit on each shift. The governor overrides the modulator and makes it shift sooner, and the modulator delays the shift point depending on the throttle position.
__________________
Why can't I get Ivermectin for my horses?
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10-27-2021, 09:59 AM
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#16
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Bus Geek
Join Date: Sep 2014
Location: Eustis FLORIDA
Posts: 23,764
Year: 1999
Coachwork: Thomas
Chassis: Freighliner FS65
Engine: Cat 3126
Rated Cap: 15
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I know with my old 466/643 The lockup in 4th almost felt like a 5th gear with additional boost. Just throwing that out there fwiw.
If you're not seeing/feeling any trans slippage my only guesses would be its not getting into 4th or it no longer has a 4.10 ratio.
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11-01-2021, 10:02 PM
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#17
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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Not 4.11 but 4.81
I just found out i have 4.81 gears, not 4.11
So what should my rpm be at 60 mph?
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11-01-2021, 10:10 PM
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#18
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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2300?? I think.
__________________
Why can't I get Ivermectin for my horses?
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11-01-2021, 10:12 PM
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#19
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Bus Crazy
Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 1,325
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
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__________________
Why can't I get Ivermectin for my horses?
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11-01-2021, 10:20 PM
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#20
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Almost There
Join Date: Jul 2021
Location: Houston TX
Posts: 73
Year: 2000
Coachwork: Thomas
Chassis: International 3800
Engine: Dt466e
Rated Cap: 29k
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Ok so 2350 it is, so why am i runint 2650 at 60mph?
Im getting so frustrated with this bus
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