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Re: 4l60E slips when cold..why?
Welcome to AF.
The valve body repair is only a band aid to the real problem on code 1870.
Transmission slippage aways go back to internal leakage problems.
Also morning sickness or slipping when cold.
Also high mileage fluid on a transmission that calls for dexron 111 fluid sometimes stirs up more problems.
I would just let it warm up a little before taking off and run it as long as still does good warmed up.
I am not much on additives on a good transmission.
But to help it along for some more miles Lucas makes a good transmission additive for a weak transmission.
If you are going to keep it a long time I would figure on a rebuild some day.
Good Luck
MT
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Remember proper testing gives us the answer to many problems.
MT
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