1994 Caprice PCM changes for 3.08 to 4.11 gear swap - Chevy Impala SS Forum
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Old 05-24-2011, 12:34 PM
jeffd jeffd is offline
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Default 1994 Caprice PCM changes for 3.08 to 4.11 gear swap

What needs to change in the tune when changing from 3.08 to 4.11 gears for a 1994 9C1 LT1 caprice? I changed the gear ratio for the speedometer to work correctly. The trans is taking a long time to shift from 1st to 2nd. The rpm's are higher than I want. I want to drive a couple of hundred miles with the new rear gears before the T56 swap.
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1996 DCM Impala SS
1994 DCM 9C1 Caprice
1981 LQ9 4L80E Trans Am
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Old 05-27-2011, 11:41 AM
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Rocko350 Rocko350 is offline
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What software are you using?

Chris
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94-95 Scan. Free, well written diagnostic software
http://www.mediafire.com/?0elo4c935uc5s
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Old 05-31-2011, 12:19 PM
jeffd jeffd is offline
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Tunercats OBD-I.
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1996 DCM Impala SS
1994 DCM 9C1 Caprice
1981 LQ9 4L80E Trans Am
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Old 05-31-2011, 08:54 PM
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there is a tool built in to the software that makes corrections to all the tables at once. its in the drop down menu at the top of the software screen. fill out the data and select apply, then ok when the little screen says"hey buddy your gonna change a sh*tload of tables" then save and upload. Its possible the rpm and mph wot(kickdown) settings might let you hit the rpm limiter before you upshift at WOT, so change at your own risk.

Chris
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94-95 Scan. Free, well written diagnostic software
http://www.mediafire.com/?0elo4c935uc5s
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