Diff swap now trans issues.
Thread Starter
Heel & Toe
Joined: May 2021
Posts: 17
Likes: 1
Diff swap now trans issues.
Did the 3.42 swap then started having rev limiter issues with it bouncing before shift. Fixed it somewhat with my tuner. Now for some reason when I start driving the car, you can hear an audible difference in RPM. If I get on it when it does that it prevents it from hard shifting. If I don't, it'll hard shift. If I turn the car off, it goes away and I'm good until it decides to do it again. What am I missing?
Drifting
Joined: Feb 2025
Posts: 1,944
Likes: 1,905
From: THE BEACH..
That's a tune issue. Your tuner might be looking at it but he's overlooking a couple of tables.
Rear Gear Ratio needs to be set, as well as shift points now with the Rear Gear change.
Not sure what you mean you can hear the RPM difference, if you go to lower Gears the car will definitely sound different because it'll go through the RPMs faster to get to speed.
Hard shifts is from the line pressure being higher, if slip is sensed the PCM will bump line pressure up so the Transmission won't self destruct.
Scan it for codes see if any come up.
Rear Gear Ratio needs to be set, as well as shift points now with the Rear Gear change.
Not sure what you mean you can hear the RPM difference, if you go to lower Gears the car will definitely sound different because it'll go through the RPMs faster to get to speed.
Hard shifts is from the line pressure being higher, if slip is sensed the PCM will bump line pressure up so the Transmission won't self destruct.
Scan it for codes see if any come up.
Safety Car
Joined: Mar 2005
Posts: 3,742
Likes: 1,205
From: Wisconsin
When you mention tuner are you talking about a person or one of those handheld tuners? Those will not change the tables that need to be changed
Last edited by feeder82; Feb 25, 2025 at 07:41 PM.
Thread Starter
Heel & Toe
Joined: May 2021
Posts: 17
Likes: 1
Person. He used Hp tuners. But it's changed a lot with him manipulating the tables. I just don't trust his abilities since he was having to read the book to try and figure it out.
Drifting
Joined: Feb 2025
Posts: 1,944
Likes: 1,905
From: THE BEACH..
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