Anyone gone from 2.73's to 3.42's? How did the shift point reprogramming go?
03-17-2018, 05:36 PM
#1
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Anyone gone from 2.73's to 3.42's? How did the shift point reprogramming go?
I've been planning to have my 2.73 diff swapped out with a 3.42 diff since January. Purchased the 3.42 diff already, it arrived 3-4 weeks ago, now just waiting for spring to get here (Massachusetts). However, the more I've been reading about the intricacies of shift point reprogramming, I'm starting to get cold feet....For an experienced performance shop, aside from swapping out the differential itself which should be fairly straight forward, is the shift point reprogramming aspect more of an art than a science or should it be pretty basic stuff for an experienced tech? Looking for the good, the bad and the ugly stories out there. Thanks.
Last edited by Bruceb66; 03-17-2018 at 05:39 PM.
03-17-2018, 06:13 PM
#2
Shift point programming is not all that hard to setup. Its pretty straight forward. Any experienced shop would have no problem doing this. If you do not like the result, take it back to them, and with your input, be able to set it up how you like.
Don't let this stop you from making the change. You will be happy you did.
Don't let this stop you from making the change. You will be happy you did.
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Bruceb66 (03-17-2018)
03-17-2018, 07:17 PM
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Shift point programming is not all that hard to setup. Its pretty straight forward. Any experienced shop would have no problem doing this. If you do not like the result, take it back to them, and with your input, be able to set it up how you like.
Don't let this stop you from making the change. You will be happy you did.
Don't let this stop you from making the change. You will be happy you did.
03-17-2018, 07:23 PM
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Any good tuner should have no problem modifying your shift points. Ideally, your tuner will work with you regarding your shift points, firmness of shift, kickdown points, etc and give you a good basic set up. The tuner will probably expect you to drive your car a little to make sure you're happy with the set up and bring it back for some fine tuning based upon feel when you drive. That's the clean and easy part of the gear change. 
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Bruceb66 (03-17-2018)
03-17-2018, 07:26 PM
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Any good tuner should have no problem modifying your shift points. Ideally, your tuner will work with you regarding your shift points, firmness of shift, kickdown points, etc and give you a good basic set up. The tuner will probably expect you to drive your car a little to make sure you're happy with the set up and bring it back for some fine tuning based upon feel when you drive. That's the clean and easy part of the gear change.
03-17-2018, 09:20 PM
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I've done 4L60e swaps and re-tunes and it isn't that hard. Any decent tuner that works on these cars regularly should be able to get it driving well in the first try. Then, they might do some fine tuning based on your feedback driving it.
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Bruceb66 (03-17-2018)
03-17-2018, 10:48 PM
#8
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3.42 Killer!
I live in the mountains, and the 2.73 stock, felt really floaty, and usually would shift from drive to 3. Changed the rearend to a Z06 3.42. I did the mail order computer programming, and now it is so cool on mountain roads, gotta be careful, can get a little sideways if your punching it, once it hits second, wow...well worth the swap. She may not do 170 anymore, but halls *****..I have Billy Boat Bullits, thats rad too...good luck
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Bruceb66 (03-18-2018)