7AT slipping

harman.khinda · 07-13-2012, 11:48 PM

So I think it's my fault I had the car on jack stand and started revving the engine to check for exhaust rattle *dumb* I was using my hands to push the brake and throttle. I go to put it in park and my hand slightly comes off the brake and it makes a grggrhgrhgrhg sound. Ever since then there is a high pitched whine when the car is cold, the tranny shifts rougher, at a higher rpm and more lag between 1 and 2 and 3. Could this be a coincidence? I thought there was some sort of parking pin to prevent the tranny from being damaged but the car had all tires in the air. I'm right @ 28K but I think the tranny is covered for 60k/5years.

I have UPREV, tp's and a cbe. I'll flash back to stock but should I put the stock cats back on? I know they can figure out how many times the ECU has been flashed but I don't know if that is enough to void the power-train warranty.

DjSquall · 07-14-2012, 01:27 AM

What revs did you slap it into park at?

harman.khinda · 07-14-2012, 09:07 AM

it was winding down - IIRC ~2.5k. i wasn't looking at the tach that just based on the sound.

DarkJak · 07-14-2012, 01:10 PM

I feel like 2.5k isn't high enough for it to permanently mess up the transmission if it just happens once. How much have you driven it since?

IDZRVIT · 07-15-2012, 08:42 AM

Quote:

Originally Posted by harman.khinda

So I think it's my fault I had the car on jack stand and started revving the engine to check for exhaust rattle *dumb*

Yes and very dangerous. Naughty boy!

harman.khinda · 07-15-2012, 10:16 AM

I've prob driven it about 300 miles since. I drive pretty hard to. it does act funny like going from reverse to drive and going into park if there is any momomentum. my friend recommended a tranny flush but I don't think that'll help. will the dealership most likely void my warranty cause of test pipes?

DarkJak · 07-15-2012, 11:53 AM

Really depends on the dealer, but the goto argument for them is that the test pipes and exhaust add extra power which the transmission was not designed to handle which could have caused it to fail. If you still have the stock cats and exhaust, I'd put those back on before taking the car to a dealership.

IDZRVIT · 07-16-2012, 08:50 AM

Quote:

Originally Posted by DarkJak

Really depends on the dealer, but the goto argument for them is that the test pipes and exhaust add extra power which the transmission was not designed to handle which could have caused it to fail. If you still have the stock cats and exhaust, I'd put those back on before taking the car to a dealership.

And the rebuttal would be "How much torque can the xmission handle? My mods haven't increased the torque enough to over torque the xmission."

harman.khinda · 07-16-2012, 10:33 PM

^ is that true for the VQ37 with bolt-ons and the 7AT?

Jamaica · 07-16-2012, 10:41 PM

Does depend on the dealer. My car has the SC on it and the dealership still warrentys the tranny. IMO you wouldnt need to change out the exhaust and pipes.

harman.khinda · 07-17-2012, 12:23 AM

^ my family has bought a few cars through them too so I hope that helps.

Do you think a tranny flush would help at all? it's kinda pricey. Also will they be able to tell that the reason its failing is because I slapped it into park on accident?

07-13-2012, 11:48 PM	#1 (permalink)
harman.khinda Enthusiast Member Join Date: Feb 2012 Location: Red Bluff, CA Posts: 378 Drives: 10 Nissan 370 PG 7AT Rep Power: 6723	7AT slipping So I think it's my fault I had the car on jack stand and started revving the engine to check for exhaust rattle dumb I was using my hands to push the brake and throttle. I go to put it in park and my hand slightly comes off the brake and it makes a grggrhgrhgrhg sound. Ever since then there is a high pitched whine when the car is cold, the tranny shifts rougher, at a higher rpm and more lag between 1 and 2 and 3. Could this be a coincidence? I thought there was some sort of parking pin to prevent the tranny from being damaged but the car had all tires in the air. I'm right @ 28K but I think the tranny is covered for 60k/5years. I have UPREV, tp's and a cbe. I'll flash back to stock but should I put the stock cats back on? I know they can figure out how many times the ECU has been flashed but I don't know if that is enough to void the power-train warranty.

07-14-2012, 09:07 AM	#3 (permalink)
harman.khinda Enthusiast Member Join Date: Feb 2012 Location: Red Bluff, CA Posts: 378 Drives: 10 Nissan 370 PG 7AT Rep Power: 6723	it was winding down - IIRC ~2.5k. i wasn't looking at the tach that just based on the sound. Last edited by harman.khinda; 07-14-2012 at 09:12 AM.

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07-14-2012, 01:27 AM	#2 (permalink)
DjSquall A True Z Fanatic Join Date: Apr 2010 Location: Tottenham, ON Age: 36 Posts: 1,340 Drives: My first car Rep Power: 22	What revs did you slap it into park at?

07-14-2012, 01:10 PM	#4 (permalink)
DarkJak A True Z Fanatic Join Date: Jun 2011 Location: Madison, WI Posts: 1,397 Drives: 2009 370Z Rep Power: 16804	I feel like 2.5k isn't high enough for it to permanently mess up the transmission if it just happens once. How much have you driven it since?

07-15-2012, 10:16 AM	#6 (permalink)
harman.khinda Enthusiast Member Join Date: Feb 2012 Location: Red Bluff, CA Posts: 378 Drives: 10 Nissan 370 PG 7AT Rep Power: 6723	I've prob driven it about 300 miles since. I drive pretty hard to. it does act funny like going from reverse to drive and going into park if there is any momomentum. my friend recommended a tranny flush but I don't think that'll help. will the dealership most likely void my warranty cause of test pipes?

07-15-2012, 11:53 AM	#7 (permalink)
DarkJak A True Z Fanatic Join Date: Jun 2011 Location: Madison, WI Posts: 1,397 Drives: 2009 370Z Rep Power: 16804	Really depends on the dealer, but the goto argument for them is that the test pipes and exhaust add extra power which the transmission was not designed to handle which could have caused it to fail. If you still have the stock cats and exhaust, I'd put those back on before taking the car to a dealership.

07-16-2012, 10:33 PM	#9 (permalink)
harman.khinda Enthusiast Member Join Date: Feb 2012 Location: Red Bluff, CA Posts: 378 Drives: 10 Nissan 370 PG 7AT Rep Power: 6723	^ is that true for the VQ37 with bolt-ons and the 7AT?

07-16-2012, 10:41 PM	#10 (permalink)
Jamaica A True Z Fanatic Join Date: Mar 2010 Location: SoCal Posts: 15,362 Drives: Under boost Rep Power: 73	Does depend on the dealer. My car has the SC on it and the dealership still warrentys the tranny. IMO you wouldnt need to change out the exhaust and pipes.

07-17-2012, 12:23 AM	#11 (permalink)
harman.khinda Enthusiast Member Join Date: Feb 2012 Location: Red Bluff, CA Posts: 378 Drives: 10 Nissan 370 PG 7AT Rep Power: 6723	^ my family has bought a few cars through them too so I hope that helps. Do you think a tranny flush would help at all? it's kinda pricey. Also will they be able to tell that the reason its failing is because I slapped it into park on accident?