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Allison help needed


KyIH
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I have a 2000 IH 4700 truck with a dt466 and mt643 auto trans that’s not shifting right. It shifts smooth up to 3rd gear then goes into 4th and right back down to 3rd and keeps jumping back and forth until I let off the throttle. Any Ideas?

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25 minutes ago, KyIH said:

I have a 2000 IH 4700 truck with a dt466 and mt643 auto trans that’s not shifting right. It shifts smooth up to 3rd gear then goes into 4th and right back down to 3rd and keeps jumping back and forth until I let off the throttle. Any Ideas?

Sounds like an issue with the governor or the governor hydraulic circuit.  There should be a test port on the transmission to check governor pressure and a chart somewhere to give pressures for corresponding speeds.  

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Id check that you have 150 psi main pressure, and see youre getting enough governor pressure while driving it.  I have a sneaking suspiscion youre a bit too low to complete the shift 

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Screenshot_20210714-163820_Samsung Internet.jpg

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