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Discussion Starter · #1 ·
Having a hard shift between 2nd and 3rd on 4R100 with 220,000 miles. Tranny has never been down, no other issues, 25,000 mile fluid changes. Plan to correct this issue by installing FTVB. Question to group is - I'm currently running the 1855 Flashpaq controller, so is this going to create a new issue between the two? We use the truck to carry a Lance slide in camper (close to 5,000 lb. fully stocked)!
 

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How does it shift with the programmer removed? The valve body might make it worse.
 

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Discussion Starter · #3 ·
Same issue between 2nd and 3rd, only less aggressive with program set back to stock! Thanks for a quick reply!
 

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Ok well you can try the valve body and it will definitely shift better stock but the programmer might not play well with it.

If the programmer conflicts you will need custom tunes. Thankfully they aren't too expensive anymore.
 
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