3.91 gear swap on my L99 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

foxygrandpa55 · 07-15-2014, 12:59 PM

I am wanting to do 1LE gear swap to my L99 but I am concerned about my warranty. Will doing the gear swap void my warranty? Do I need to have my dealership do the install?

BC 2010 · 07-15-2014, 02:11 PM

No and No

JKO · 07-15-2014, 02:14 PM

I am having the dealership do mine as we speak they are a little high cost wise also.

foxygrandpa55 · 07-15-2014, 02:15 PM

So if I got another shop to do my gear swap then my car is still under warranty? What do I do if the dealer ship tried to void it for some reason?

strych9 · 07-15-2014, 02:22 PM

The ECM (engine computer) needs to be reprogrammed to get your speedometer to read the correct MPH with the gear swap. Any reprogramming that is done outside of a GM dealer can and will put your warranty at risk. In the event of a major powertrain component failure, the dealer is required to send in a snapshot of the ECM calibration, and if it isn't a GM calibration, they will deny the claim and void your powertrain warranty. No exceptions.

rich3fan · 07-15-2014, 02:52 PM

Quote:

Originally Posted by foxygrandpa55

I am wanting to do 1LE gear swap to my L99 but I am concerned about my warranty. Will doing the gear swap void my warranty? Do I need to have my dealership do the install?

This thread should answer your warranty concerns: http://www.camaro5.com/forums/showthread.php?t=27807

foxygrandpa55 · 07-15-2014, 02:56 PM

Ok so if I did the gear swap at another shop but did the speedo recalibration at the dealer then it is still under warranty, got it.

What if I reprogrammed it myself with my own programmer and if for some reason there is power train failure I returned it to the stock tune. Would they be able to tell or void?

Sent from my iPhone using Tapatalk

strych9 · 07-16-2014, 02:36 PM

Quote:

Originally Posted by foxygrandpa55

Ok so if I did the gear swap at another shop but did the speedo recalibration at the dealer then it is still under warranty, got it.

What if I reprogrammed it myself with my own programmer and if for some reason there is power train failure I returned it to the stock tune. Would they be able to tell or void?

Sent from my iPhone using Tapatalk

All calibrations are tracked, even outside of the ECM itself. There is no way to hide the action, so don't even consider it.

SS PANTHER · 07-19-2014, 05:39 AM

Quote:

Originally Posted by strych9

All calibrations are tracked, even outside of the ECM itself. There is no way to hide the action, so don't even consider it.

The L99 needs to be calibrated. The LS3 does not.

KahunaSS · 07-22-2014, 02:04 AM

Quote:

Originally Posted by foxygrandpa55

I am wanting to do 1LE gear swap to my L99 but I am concerned about my warranty. Will doing the gear swap void my warranty? Do I need to have my dealership do the install?

Your warranty will not be voided if you buy the GM gears.. You can't buy another brand like richmond or yukon... It has to be GM.... and yes GM make the 3.91.. Not the 3.73 though...

fldrummer · 07-22-2014, 07:09 AM

Quote:

Originally Posted by SS PANTHER

The L99 needs to be calibrated. The LS3 does not.

WRONG!!!!

Pro Stock John · 07-22-2014, 09:04 AM

GM was coming out with tunes for folks doing a 3.91 gear swap, one tune for L99 and one for LS3. You'd need to find a dealer who installs gears. Most likely the dealer will be pricier.

True install time is 4 hours give or take. My 3.91s only took one attempt to set up and are totally quiet.

Scott@Bjorn3D · 07-22-2014, 08:12 PM

Quote:

Originally Posted by SS PANTHER

The L99 needs to be calibrated. The LS3 does not.

WRONG. LS3 needs calibration since your speedo is off. If gears are not put in by a GM dealer drivetrain warranty is also voided.

foxygrandpa55 · 07-22-2014, 09:59 PM

Ok so I am getting two different stories:

1. The dealership has to install the gears for me to be covered under warranty
2. The dealership does not have to install gears for me to be under warranty

Not to be rude to anyone, but can someone with actual knowledge on this subject give me a straight answer on this. Because I am planning on doing this mod in the next week and I don't want to speed the extra money if I do not need to.

Thanks

07-15-2014, 12:59 PM	#1
foxygrandpa55 Drives: 2012 IOM 2SS/RS Join Date: Jan 2012 Location: Houston, TX Posts: 185	3.91 gear swap on my L99 I am wanting to do 1LE gear swap to my L99 but I am concerned about my warranty. Will doing the gear swap void my warranty? Do I need to have my dealership do the install?

07-15-2014, 02:22 PM	#5
strych9 I'll be back... Drives: Subaru, HD Road Glide Special Join Date: Apr 2012 Location: Omaha, NE Posts: 3,036 View My Garage	The ECM (engine computer) needs to be reprogrammed to get your speedometer to read the correct MPH with the gear swap. Any reprogramming that is done outside of a GM dealer can and will put your warranty at risk. In the event of a major powertrain component failure, the dealer is required to send in a snapshot of the ECM calibration, and if it isn't a GM calibration, they will deny the claim and void your powertrain warranty. No exceptions. __________________ Bye bye, Bumblebee! --------------------------------------------------------------------------------------- Build Journal My Garage GoPro Mic Hack

07-22-2014, 09:04 AM	#12
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	GM was coming out with tunes for folks doing a 3.91 gear swap, one tune for L99 and one for LS3. You'd need to find a dealer who installs gears. Most likely the dealer will be pricier. True install time is 4 hours give or take. My 3.91s only took one attempt to set up and are totally quiet. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

07-15-2014, 02:11 PM	#2
BC 2010 BC 2010 Drives: 2010 Camaro SIM 2SS/RS M6 GFX SR Join Date: Aug 2009 Location: Santa Barbara, CA Posts: 232	No and No

07-15-2014, 02:14 PM	#3
JKO Drives: 2016 2 SS Join Date: Jun 2014 Location: South Louisiana Posts: 154	I am having the dealership do mine as we speak they are a little high cost wise also.

07-15-2014, 02:15 PM	#4
foxygrandpa55 Drives: 2012 IOM 2SS/RS Join Date: Jan 2012 Location: Houston, TX Posts: 185	So if I got another shop to do my gear swap then my car is still under warranty? What do I do if the dealer ship tried to void it for some reason?

07-15-2014, 02:56 PM	#7
foxygrandpa55 Drives: 2012 IOM 2SS/RS Join Date: Jan 2012 Location: Houston, TX Posts: 185	Ok so if I did the gear swap at another shop but did the speedo recalibration at the dealer then it is still under warranty, got it. What if I reprogrammed it myself with my own programmer and if for some reason there is power train failure I returned it to the stock tune. Would they be able to tell or void? Sent from my iPhone using Tapatalk

07-22-2014, 09:59 PM	#14
foxygrandpa55 Drives: 2012 IOM 2SS/RS Join Date: Jan 2012 Location: Houston, TX Posts: 185	Ok so I am getting two different stories: 1. The dealership has to install the gears for me to be covered under warranty 2. The dealership does not have to install gears for me to be under warranty Not to be rude to anyone, but can someone with actual knowledge on this subject give me a straight answer on this. Because I am planning on doing this mod in the next week and I don't want to speed the extra money if I do not need to. Thanks