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Old 10-26-2021, 09:47 PM   #1
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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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Old 10-26-2021, 10:13 PM   #2
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what size tires does it have?
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Old 10-26-2021, 10:16 PM   #3
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Tires arw 11r225
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Old 10-26-2021, 11:24 PM   #4
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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?
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Old 10-26-2021, 11:40 PM   #5
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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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Old 10-26-2021, 11:41 PM   #6
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I doubleckecked the tachometer and speedometer with a nexiq reader and servicemaxx
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Old 10-26-2021, 11:43 PM   #7
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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.
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Old 10-26-2021, 11:44 PM   #8
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Is this a front engine or rear engine.
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Old 10-26-2021, 11:45 PM   #9
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Torque converter pistons on these can sometimes crack and leave you without lock up.
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Old 10-26-2021, 11:46 PM   #10
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Your transmission is new enough to have modulated lock-up in other gears.
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Old 10-26-2021, 11:55 PM   #11
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Front dog nose
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Old 10-26-2021, 11:57 PM   #12
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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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Old 10-27-2021, 12:31 AM   #13
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Mine drops from about 2500 in 3rd to about 1700 in 4th.
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Old 10-27-2021, 10:28 AM   #14
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Does anyone know how to chexk the modulator and kickdown cable?
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Old 10-27-2021, 10:45 AM   #15
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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.
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Old 10-27-2021, 10:59 AM   #16
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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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Old 11-01-2021, 11:02 PM   #17
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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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Old 11-01-2021, 11:10 PM   #18
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2300?? I think.
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Old 11-01-2021, 11:12 PM   #19
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Here you go. Save this website. https://wellertruck.com/road-speed-calculator
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Old 11-01-2021, 11:20 PM   #20
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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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