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GreenMachine04

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  1. GreenMachine04
    That is a very common issue with the 4L60s. Back in day the TCC regulator valve (reg valve) used to be a 2 piece design but was updated because of the reg valve wearing out the bore of the VB (valve body). Unfortunatley, the bean counters did not change the material of the reg valve so it still would wear out the bore in the VB but usually this occurs after the warranty is up on the vehicle so GM doesnt have to pay for it. The last post was absolutely correct - reg valve is steel and VB is aluminum so you know which one is going to win...
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