Gear swap
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Cruising
Joined: Aug 2025
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Gear swap
I’m looking to swap my gears coming from the 2.59 so my trans is an a4. I’ve done my fair share of research including getting the part numbers for the drive gear, driven gear, and speed sensor. One question I still have is will I need to reprogram my shift points even with the new gears and sensor put in? If I were to go to a 3.07 or 3.54.
thanks,
thanks,
Safety Car
Joined: Dec 2009
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From: Birmingham Al
I went in my 93 700R4 trans from 259 to 307 the shift points changed ,I have a custom trans the shift points were hi ( had it built that way ) after the gear change dropped the shift points way down OD was 59 now 49 ,I read can on this non E trans can fool with the governor weights ,with an E trans way different deal can I think can reprogram it ..
Thread Starter
Cruising
Joined: Aug 2025
Posts: 12
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I went in my 93 700R4 trans from 259 to 307 the shift points changed ,I have a custom trans the shift points were hi ( had it built that way ) after the gear change dropped the shift points way down OD was 59 now 49 ,I read can on this non E trans can fool with the governor weights ,with an E trans way different deal can I think can reprogram it ..
Melting Slicks
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From: Sligo PA
Thread Starter
Cruising
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so I have the 4L60E, I assume that would mean it would be all reprogramming related?
Melting Slicks
Joined: Mar 2002
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From: Sligo PA
Ok that changes things. Because your ECU commands the shift based on mph speed instead of output shaft rpm, then as long as you have an accurate signal output to the ECU then you wouldn't need any programming unless you wanted to.
Thread Starter
Cruising
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gotcha, and so as long as I ensured correct drive/driven gears and sensor were installed then I should have that correct output based on mph
Melting Slicks
Joined: Mar 2002
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From: Sligo PA
If you wanted a tune anyway you might be able to change the pulses per mile in the ECU instead of messing with the speed sensor. I'm not an expert on tuning factory ecu's on later C4 's so I would double check that. But it might save you some hassle if you could. PCM for less would be a good one to call and ask.
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Melting Slicks
Joined: Aug 2003
Posts: 3,399
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From: Lakeville MI
Ugh. Without programming, the 4L60E will shift at the same mph as before for a given shift (1->2, 2->3, 3->4 etc) but at much higher rpm. I don't think this is what you want.
Gear calculator: https://www.andysautosport.com/learn...LSY5#GearRatio
Gear calculator: https://www.andysautosport.com/learn...LSY5#GearRatio
Last edited by tequilaboy; Aug 12, 2025 at 11:39 AM.
Thread Starter
Cruising
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Melting Slicks
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From: So Cal
2023 C4 of the Year Finalist - Unmodified
Use a Dakota Digital Signal Conditioner. It inserts in the yellow and purple wires that come out of the VSS on the transmission. No need to mess with the PCM programming which is fraught with possible additional unintended consequences.
Thread Starter
Cruising
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Use a Dakota Digital Signal Conditioner. It inserts in the yellow and purple wires that come out of the VSS on the transmission. No need to mess with the PCM programming which is fraught with possible additional unintended consequences.
Team Owner
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Assuming a '96 4L60e and if you're wanting to do a 3.07 I believe there are valid arguments that could be made to do it with programming of the PCM. 3.07 was an available option and should be a very straight forward programming.
You need to understand that your 4L60e in '96 doesn't have drive, driven gear or options for VSS. No 4L60e used drive, driven & VSS options ever. If there's a local programmer I believe the programming could also be less expensive than a DRA.
You need to understand that your 4L60e in '96 doesn't have drive, driven gear or options for VSS. No 4L60e used drive, driven & VSS options ever. If there's a local programmer I believe the programming could also be less expensive than a DRA.
Thread Starter
Cruising
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Assuming a '96 4L60e and if you're wanting to do a 3.07 I believe there are valid arguments that could be made to do it with programming of the PCM. 3.07 was an available option and should be a very straight forward programming.
You need to understand that your 4L60e in '96 doesn't have drive, driven gear or options for VSS. No 4L60e used drive, driven & VSS options ever. If there's a local programmer I believe the programming could also be less expensive than a DRA.
You need to understand that your 4L60e in '96 doesn't have drive, driven gear or options for VSS. No 4L60e used drive, driven & VSS options ever. If there's a local programmer I believe the programming could also be less expensive than a DRA.