Hard Downshift Question
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Joined: Feb 2001
Posts: 25
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From: Fort Walton Beach, FL
Shift Kit or Transmission Reprogramming?
My question is what the difference is between a shift kit and a transmission reprogramming kit? Does a shift kit just increase the hydraulic pressure or does it change the shift points and durations?
My '99 with a 4R70W trans has started to downshift "hard" when decelerating when it shifts from 3-2 and 2-1. I just changed the trans and torque converter fluid with Mercon V about a month ago thinking it would improve, but no change, The truck has about 33,000 miles.
After reading several of the posts about shift kits/reprogramming, I'm thinking that installing one may improve this problem and give me a little better performance to boot.
//JQ
My '99 with a 4R70W trans has started to downshift "hard" when decelerating when it shifts from 3-2 and 2-1. I just changed the trans and torque converter fluid with Mercon V about a month ago thinking it would improve, but no change, The truck has about 33,000 miles.
After reading several of the posts about shift kits/reprogramming, I'm thinking that installing one may improve this problem and give me a little better performance to boot.
//JQ
Last edited by JohnnyQ; Apr 3, 2002 at 01:44 AM.