Duramax Diesels Forum Truck of the Week
  #1  
Old 12-06-2019, 05:30 PM
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citadel citadel is offline
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Default Shifted into reverse on accident

Hello all.

Long story short: I screwed up. Someone almost hit me the other day and I threw the truck into first gear while standing on the brakes. After a brief chat, I threw an adult temper tantrum and stomped on the go pedal. This is when I realized I was in first. So in a stupid panic, I tried to throw it in D. And I missed. And then I missed Neutral. Then the truck made some painful noises and didn't accelerate. As I coasted to the nearest stoplight, I threw it in park and said some prayers, put it back in drive and made it. I know I need to drop the pan and check for jewelry, but how bad did I screw up? I will also accept all the "you stupid idiot" comments. I have the dashcam clip if it helps or entertains.
If a rebuild is in order, what is the best way to go for diy? Thanks in advance.
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  #2  
Old 12-06-2019, 06:16 PM
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IIRC, Ben once said that the Allison wont actually shift into R from D when the truck is moving. Someone will have to back me up on that, though.
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  #3  
Old 12-06-2019, 06:33 PM
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Quote:
Originally Posted by TheBac View Post
IIRC, Ben once said that the Allison wont actually shift into R from D when the truck is moving. Someone will have to back me up on that, though.
I think thatís correct. Also if you push the lever away from you, and towards the firewall while youíre going from 1st to drive it will not go past neutral I believe.
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  #4  
Old 12-06-2019, 06:55 PM
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Default Video of adult temper tantrum. (NSFW Language)

Thank goodness for the automatic stupid protection. And thanks for the quick responses.

So here's the video. Warning on language. Guy popped out and I lost my temper a little bit. I have mixed feelings on my reaction but am working on this with my doctor. If this is too stupid or improper, I will remove the link.

https://youtu.be/wNXwYYTUQK0

edit for grammer
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2005 GMC Sierra 2500HD SLE CC LB
S&B Turbo Inlet Banks Intake
Banks Intercooler
Stock turbo with TCT BMW,
10 vane compressor, Billet vanes by Fingers
DHD 3" Y-Bridge
Nictane Adapter Airdog II DF-165
MBRP 4" Frontpipe back exhaust
MBRP Downpipe
Dmaxflow exhaust manifolds and up pipes
Trans rebuilt by me
Tuned by Idaho Rob
Kenwood DNX-5120
Buckstop bumpers front and back
Nicknamed "Audrey III"
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  #5  
Old 12-06-2019, 07:33 PM
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TCM will not let you do something stupid. You are probably fine.
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  #6  
Old 12-06-2019, 09:26 PM
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couldnt hear the noise but maybe you where past reverse and started on park and heard the parking pawl trying to engage?
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  #7  
Old 12-06-2019, 10:47 PM
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Quote:
Originally Posted by TheBac View Post
IIRC, Ben once said that the Allison wont actually shift into R from D when the truck is moving. Someone will have to back me up on that, though.
It won't. If you drop it to R while moving along, it'll give you a shift range inhibited abd essentially drop to neutral until you put it back to drive.

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Old 12-06-2019, 10:57 PM
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Quote:
Originally Posted by citadel View Post
Thank goodness for the automatic stupid protection. And thanks for the quick responses.

So here's the video. Warning on language. Guy popped out and I lost my temper a little bit. I have mixed feelings on my reaction but am working on this with my doctor. If this is too stupid or improper, I will remove the link.

https://youtu.be/wNXwYYTUQK0

edit for grammer
My only thoughts from the vid are I wouldn't have stopped in the middle of the intersection, if at all with no contact. No contact, at the end of the day is no problem. Maybe give them the #1 driver salute, cuss a bit and move on. Been there more than once.

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'04.5 2500HD Silverado LT CC/LB, LBZ D/A Dark Grey
Metallic, 05+ HD Hood & Grille, 192k and counting
Mike L Trans built by ME.
EFILive, PPE Race Valve, KD Twin Lift Pumps & Billet Fuel Pickup, MBRP 4" "Cat-Back" T409 straight piped.

300.59' 3rd place first pull

Best 1/4 times:
Truck: 14.067 @ 96.29, weighing in at over 7200#
446.4RWHP/820.2RWTq
Car (95 Cougar 4.6L V8): 14.680 @ 94.00

"The FIRST weapon is the mind, all others are incidental."
"I'd rather be judged by twelve than carried by six."
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  #9  
Old 12-06-2019, 11:42 PM
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citadel citadel is offline
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Quote:
Originally Posted by Cougar281 View Post
My only thoughts from the vid are I wouldn't have stopped in the middle of the intersection, if at all with no contact. No contact, at the end of the day is no problem. Maybe give them the #1 driver salute, cuss a bit and move on. Been there more than once.

Sent from my 2PZC5 using Tapatalk
You're definitely right. When I saw the poor kid jump out, all I could think at the time was stop. After review, I can see that he stopped enough as well. I wished I would have kept rolling along and had a worry free day.
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2005 GMC Sierra 2500HD SLE CC LB
S&B Turbo Inlet Banks Intake
Banks Intercooler
Stock turbo with TCT BMW,
10 vane compressor, Billet vanes by Fingers
DHD 3" Y-Bridge
Nictane Adapter Airdog II DF-165
MBRP 4" Frontpipe back exhaust
MBRP Downpipe
Dmaxflow exhaust manifolds and up pipes
Trans rebuilt by me
Tuned by Idaho Rob
Kenwood DNX-5120
Buckstop bumpers front and back
Nicknamed "Audrey III"
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  #10  
Old 12-07-2019, 06:09 AM
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Quote:
Originally Posted by gmduramax View Post
I think thatís correct. Also if you push the lever away from you, and towards the firewall while youíre going from 1st to drive it will not go past neutral I believe.
Yup, if you push forward it will not go past neutral.
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  #11  
Old 12-07-2019, 08:18 AM
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DAVe3283 DAVe3283 is offline
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Just confirming what others have said, the TCM won't let you go into reverse at speed. I think it's something like 8 MPH or above disables reverse.

Your backup lights do come on, and more than once I've used it to mess with tailgaters. Throw it in reverse at 70 MPH and they look all kinds of confused. Not that I recommend throwing the trans in reverse at speed or acknowledging the tailgater. Often just makes them more pissed once they realize you're not actually coming back towards them.
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Old 12-07-2019, 09:33 AM
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I've thrown my trucks into low gear at 120 MPH and let it coast to a stop. There was talk back in '03 that doing this would help relearn. Joe Webb ( Suncoast ) and I tried this numerous times to see if it worked. There was no conclusive evidence that it did or didn't. We both thought it might have done something, but we both could have been full of shit.
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  #13  
Old 12-08-2019, 08:44 AM
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Bet that's a wild ride! Lol
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Old 12-08-2019, 09:37 AM
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Quote:
Originally Posted by NC-smokinlmm View Post
Bet that's a wild ride! Lol
Very uneventfull. It just normaly slowed down to a stop.
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  #15  
Old 12-08-2019, 10:23 AM
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I would think you would become one with the windshield.
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