forward pressure in park
02-02-2013, 12:38 AM
#1
On The Tree
Thread Starter
iTrader: (1)
Join Date: Oct 2011
Location: South Dakota
Posts: 108
Likes: 0
Received 0 Likes
on
0 Posts
forward pressure in park
Just seeing what you guys think, I tried the search but on my phone it sucks so I apologize if this should have been easy to find. Truck is a 03 Silverado ss, when its in park it seems there is a little forward pressure, mostly When I start it cold. (below zero the past few mornings) it lurches a bit at start up. Also when I park on a slight hill it won't roll back wards until I shut it off. What do ya think could be going on?
02-02-2013, 01:06 AM
#2
Normal.
You park on a hill, and the truck rolls into the parking pawl. Then it also rolls into the engine & trans mounts. When you restart the engine, it rocks in the mounts and the truck moves.
If you don't like it, try this(it will only work if your parking brake holds). Next time you park your truck, while it's in Drive, set the parking brake. Then shift into Park and remove the key. The next time you start your engine, it won't move the truck.
You park on a hill, and the truck rolls into the parking pawl. Then it also rolls into the engine & trans mounts. When you restart the engine, it rocks in the mounts and the truck moves.
If you don't like it, try this(it will only work if your parking brake holds). Next time you park your truck, while it's in Drive, set the parking brake. Then shift into Park and remove the key. The next time you start your engine, it won't move the truck.
Last edited by AKlowriderZ71; 02-02-2013 at 01:13 AM.
02-02-2013, 07:59 AM
#3
On The Tree
Thread Starter
iTrader: (1)
Join Date: Oct 2011
Location: South Dakota
Posts: 108
Likes: 0
Received 0 Likes
on
0 Posts
Alright thanks, I just wasn't sure because is my third nbs truck and I've never noticed it before, but if its nothing to be concerned about then great, thanks!
02-03-2013, 01:53 PM
#4
TECH Fanatic
Bulletin No.: 08-07-30-026A
Date: May 17, 2011
Subject: Information on Slight Vehicle Movement in Park at Start Up After Cold Soak
Models:
2012 and Prior GM Passenger Cars and Light Duty Trucks
Equipped with Automatic Transmission Supercede:
This bulletin is being revised to add the 2010-2012 model years. Please discard Corporate Bulletin Number 08-07-30-026 (Section 07 - Transmission/Transaxle). Some vehicles may rock or move slightly forward or rearward while in park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
This slight movement is due to the residual transmission fluid in the clutch packs that creates a partial apply on start up. This movement is stopped by the parking pawl and/or transmission fluid exhausting completely from the clutch packs.
This slight movement has no adverse affects on the transmission and no repair should be attempted. This condition is normal. This can be verified by comparing with another identically built vehicle under the same cold conditions.
To prevent this condition from occurring, the parking brake should be utilized as per the Owner's Manual recommendations anytime the vehicle is parked.
Date: May 17, 2011
Subject: Information on Slight Vehicle Movement in Park at Start Up After Cold Soak
Models:
2012 and Prior GM Passenger Cars and Light Duty Trucks
Equipped with Automatic Transmission Supercede:
This bulletin is being revised to add the 2010-2012 model years. Please discard Corporate Bulletin Number 08-07-30-026 (Section 07 - Transmission/Transaxle). Some vehicles may rock or move slightly forward or rearward while in park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
This slight movement is due to the residual transmission fluid in the clutch packs that creates a partial apply on start up. This movement is stopped by the parking pawl and/or transmission fluid exhausting completely from the clutch packs.
This slight movement has no adverse affects on the transmission and no repair should be attempted. This condition is normal. This can be verified by comparing with another identically built vehicle under the same cold conditions.
To prevent this condition from occurring, the parking brake should be utilized as per the Owner's Manual recommendations anytime the vehicle is parked.
Thread
Thread Starter
Forum
Replies
Last Post
carid
Sponsor's Announcements, Sales, and Specials
0
10-01-2015 09:22 AM
lxcoupe
GM Parts Classifieds
3
09-25-2015 12:36 PM
