Gitusum

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

Shoaf85

Being auto you will probably need some shift point adjustments!

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

robert miller

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!

Shoaf85

In order for trans to work properly yes!

a/c man

Rick you need a retune anyway yes you can drive it but it will shift out early like 4000rpm

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.

0rodney@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.

p1bz

BAM.....great post from experience.

2000BC

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!

MVP'S ZO6

Hmmm. Nice one.

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.

a/c man

so what gear is in the car?

Gitusum

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