Transmission Rockin

dragrazer · 03-31-2016, 08:31 AM

When the car is in park and running. Once I goose the throttle the car rocks forward. Any suggestions

Tom Goldman · 03-31-2016, 12:59 PM

Common on Powerglides with 7 or more direct clutches .
Check with your trans builder on how many discs you have and how much clearance they have.
Even with increased clearance there will still be some rocking due to the drag of so many clutches ,especially when the fluid is cold.
That's why Stock and SS cars run as few clutches as possible and run o ring segments between the plates to keep the discs from creating drag and slowing up ET, not a big issue on most .90 cars.

dragrazer · 03-31-2016, 11:32 PM

Thanks, that is exactly what I have. I'll contact my transmission builder Kenny (PTC).

Bill Baer · 04-01-2016, 12:29 PM

"When the car is in park and running. Once I goose the throttle the car rocks forward. Any suggestions"
Unless the parking paw has been removed it's impossible for the trans to rock significantly (it's mechanically locked) if it rocks in neutral as stated previously is a result of the direct (high gear) clutches dragging and is pretty much normal and to be expected. Don't worry about it.

Lenny5160 · 04-01-2016, 04:23 PM

Also double-check that your shifter cable is adjusted properly. Check it in more than one gear position. I like to check Park and Low.

03-31-2016, 08:31 AM	#1
dragrazer Junior Member Join Date: Oct 2013 Posts: 21 Likes: 0 Liked 2 Times in 2 Posts	Transmission Rockin When the car is in park and running. Once I goose the throttle the car rocks forward. Any suggestions

03-31-2016, 12:59 PM	#2
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,435 Likes: 774 Liked 699 Times in 203 Posts	Re: Transmission Rockin Common on Powerglides with 7 or more direct clutches . Check with your trans builder on how many discs you have and how much clearance they have. Even with increased clearance there will still be some rocking due to the drag of so many clutches ,especially when the fluid is cold. That's why Stock and SS cars run as few clutches as possible and run o ring segments between the plates to keep the discs from creating drag and slowing up ET, not a big issue on most .90 cars. __________________ Tom Goldman 1500 SG , 1506 STK

03-31-2016, 11:32 PM	#3
dragrazer Junior Member Join Date: Oct 2013 Posts: 21 Likes: 0 Liked 2 Times in 2 Posts	Re: Transmission Rockin Thanks, that is exactly what I have. I'll contact my transmission builder Kenny (PTC).

04-01-2016, 12:29 PM	#4
Bill Baer Senior Member Join Date: Jul 2007 Location: Nothern IL Posts: 596 Likes: 1 Liked 1 Time in 1 Post	Re: Transmission Rockin "When the car is in park and running. Once I goose the throttle the car rocks forward. Any suggestions" Unless the parking paw has been removed it's impossible for the trans to rock significantly (it's mechanically locked) if it rocks in neutral as stated previously is a result of the direct (high gear) clutches dragging and is pretty much normal and to be expected. Don't worry about it. __________________ Bill Baer 3391 SC, 339B SC, QR

04-01-2016, 04:23 PM	#5
Lenny5160 Senior Member Join Date: Nov 2015 Location: Inver Grove Heights, MN Posts: 898 Likes: 604 Liked 432 Times in 225 Posts	Re: Transmission Rockin Also double-check that your shifter cable is adjusted properly. Check it in more than one gear position. I like to check Park and Low. __________________ S/ST 51 S/C 53

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