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Built transmission, re-tune?

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121
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Location
New Hampshire
Vehicle
2021 Explorer ST
#1
Time to get the trans built, was wondering if anyone knows if I will need a re-tune after building it (Assuming yes), or just return to stock before removal and re-install? Currently ZFG 93 tuned. TIA
 

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Nevada
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'20 Raptor, '22 Explorer ST, '14 GT500, '03 F150
#2
It’s not mandatory to get it done, but I would definitely get it retuned. The tuner can definitely dial it in a lot more.
 

OP
21STBlkout
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Location
New Hampshire
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2021 Explorer ST
Thread Starter #3
It’s not mandatory to get it done, but I would definitely get it retuned. The tuner can definitely dial it in a lot more.
Ah! good to know it doesn't have to be, Should I bring it back to stock before I do anything or does it matter? My concern was to actually be able to drive it once the new one is in place. I will get with my tuner to have it dialed in though, thanks very much for the info.
 

Messages
2,664
Reactions
1,188
Points
252
Location
Nevada
Vehicle
'20 Raptor, '22 Explorer ST, '14 GT500, '03 F150
#4
Ah! good to know it doesn't have to be, Should I bring it back to stock before I do anything or does it matter? My concern was to actually be able to drive it once the new one is in place. I will get with my tuner to have it dialed in though, thanks very much for the info.
No, think you misunderstood my statement. You don’t need to get a retune at all. I would get a retune, because the tuner can start throwing more power at it.
 

OP
21STBlkout
Messages
121
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33
Points
27
Location
New Hampshire
Vehicle
2021 Explorer ST
Thread Starter #5
No, think you misunderstood my statement. You don’t need to get a retune at all. I would get a retune, because the tuner can start throwing more power at it.
Ah ok yeah misunderstood on my end thanks for the clarification!
 

Messages
53
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70
Points
17
Location
texas
Vehicle
2023 Explorer ST
#6
I was told by RSA that stock tuning was required for the new valve body to be programmed. After that was done, upload the previous 93 tune and go have fun. My tuner also made changes to the shift pressures and such to match the valve body changes RSA does. It is a night and day difference from what the stock unit was to what the RSA one is.
 



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