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Tuning gear question

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Old Nov 15, 2013 | 07:39 AM
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Default Tuning gear question

so if i change my gears in my rear from a 3.73 to a 3.15 will i need to get the car tuned for that to drive it ?

Rick
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Old Nov 15, 2013 | 09:04 AM
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Being auto you will probably need some shift point adjustments!
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Old Nov 15, 2013 | 09:22 AM
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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
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The "TUNE" must be adjusted to the new gearset in the PCM - it will be listed and calibrated for the current 3.73 and it will need to be now set for the 3.15's!

It's a simple easy input of numbers in the correct table and all will be good!

Use HP Tuners and within 5 minutes it will be complete!

Thanks,Matt
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Old Nov 15, 2013 | 09:36 AM
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Originally Posted by madmatt9471
The "TUNE" must be adjusted to the new gearset in the PCM - it will be listed and calibrated for the current 3.73 and it will need to be now set for the 3.15's!

It's a simple easy input of numbers in the correct table and all will be good!

Use HP Tuners and within 5 minutes it will be complete!

Thanks,Matt
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Old Nov 15, 2013 | 12:44 PM
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Not meaning to sound dumb but do you need to be retuned with a 6 speed STS TT since I just changed from 3:42's to 4:10's ??? Thanks!
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Old Nov 15, 2013 | 01:13 PM
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In order for trans to work properly yes!

Last edited by Shoaf85; Nov 15, 2013 at 07:22 PM.
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Old Nov 15, 2013 | 03:36 PM
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Rick you need a retune anyway yes you can drive it but it will shift out early like 4000rpm
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Old Nov 15, 2013 | 06:12 PM
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Originally Posted by 2000BC
Not meaning to sound dumb but do you need to be retuned with a 6 speed STS TT since I just changed from 3:42's to 4:10's ??? Thanks!
You don't have to, but you should, and even the engine could probably handle a good deal more timing as is now sees less load.
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Old Nov 15, 2013 | 06:16 PM
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Yes it will need calibrated before it is driven. The speedometer will not be effected as it reads off the ring gear. The shift points will be off and MOST importantly.... The torque converter will not lock properly and will/could cause the transmission to overheat.
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Old Nov 15, 2013 | 07:25 PM
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Originally Posted by rodney@rpmtransmissions
Yes it will need calibrated before it is driven. The speedometer will not be effected as it reads off the ring gear. The shift points will be off and MOST importantly.... The torque converter will not lock properly and will/could cause the transmission to overheat.
BAM.....great post from experience.
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Old Nov 20, 2013 | 12:04 PM
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Originally Posted by p1bz
You don't have to, but you should, and even the engine could probably handle a good deal more timing as is now sees less load.
Thanks! Makes sense. Definitely revs like a 2 cycle now and I saw some noticeable uncharacteristic smoke at top of wot! I don't think the tune is optimized now. Sorry to OP for hijack!
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Old Nov 20, 2013 | 03:46 PM
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Originally Posted by rodney@rpmtransmissions
Yes it will need calibrated before it is driven. The speedometer will not be effected as it reads off the ring gear. The shift points will be off and MOST importantly.... The torque converter will not lock properly and will/could cause the transmission to overheat.
Hmmm. Nice one.
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Old Nov 27, 2013 | 12:26 PM
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Anyone wanna take a guess as to what gear ratio rick's tune shows??

Oh no need, I'll tell you. 3.42. Interesting.
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Old Nov 27, 2013 | 07:43 PM
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Originally Posted by MVP'S ZO6
Anyone wanna take a guess as to what gear ratio rick's tune shows??

Oh no need, I'll tell you. 3.42. Interesting.
so what gear is in the car?
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Old Nov 27, 2013 | 07:58 PM
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Originally Posted by a/c man
so what gear is in the car?

at the present time? 3.73 last year at this time it was a 3.42 but i was told by mayhem i must be drunk!!!! so then how did it have a 3.42 rear tuned in it for 3 years??? i am calling ummmmm
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