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Reload this Page Just did T56 swap..need to tune?

Transmissions and Drivetrain Need help with your trans? Problems with your axle?

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Old 06-15-2009, 08:05 PM   #1
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Location: North Haledon, NJ, USA
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Car: 1989 Camaro IROC-Z
Engine: L98
Transmission: 700R4

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Just did T56 swap..need to tune?
I just finished my T56 swap into my 89 IROC, do I have to tune out the tq converter lockup or anything? I went for a quick drive around the block before we had a downpour and my check engine light came on for a few seconds when I was in 3rd gear then didn't come back again. Even while I had it idling in my driveway and just moving it around the garage.
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Old 06-15-2009, 08:51 PM   #2
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Join Date: Aug 1999
Location: Elkton MD, USA
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Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac

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Re: Just did T56 swap..need to tune?
Did you wire the VSS to the ECM? The T56 VSS signal isn't directly compatible with your '89 VSS. Without tuning the PROM to tell it you have a manual trans now, your idle will be higher than normal, trying to overcome the TQ conv load.

Jumper A-B on your ALDL if you don't have a scanner, and pull the code to see why the SES light came on before.
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Old 06-15-2009, 09:46 PM   #3
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Re: Just did T56 swap..need to tune?
makes sense; I don't have the VSS hooked up and my idle was a good amount higher than normal.
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Old 06-16-2009, 03:01 PM   #4
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Re: Just did T56 swap..need to tune?
It's throwing code 24, VSS. So looks like I just have to tune that out. Thanks for the info
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Reload this Page Just did T56 swap..need to tune?
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