4T65E EPC piston spring size? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Oldsmobile When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-11-2014, 11:22 AM   #1
Junior Member
Thread Starter
 
Join Date: Mar 2014
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
dash8guru is on a distinguished road
Default 4T65E EPC piston spring size?

I really screwed this one up. Careless in keeping my valve body springs with there proper pistons, I managed to get them mixed up.
I found an explanation online of the spring numbers per the ATSG manual and have found a home for all except one, the EPC spring.
The spring that I think goes on the end of the valve measures 6mm X 23mm and it has a very soft spring rate. The ATSG manual diagram tags it as #320.
It fits perfect on the nub at the end of the piston. The diagram I found calls out for an 8mm X 23mm spring. I don't have a spring that size nor do I think it will fit in the bore.
Can anyone tell me what size spring actually goes on the end of the EPC solinoid piston?

Last edited by dash8guru; 03-11-2014 at 11:26 AM.
dash8guru is offline   Reply With Quote
Old 03-11-2014, 12:13 PM   #2
Junior Member
Thread Starter
 
Join Date: Mar 2014
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
dash8guru is on a distinguished road
Default

Here is a valve body breakdown.

http://www.atra.com/bulletins/2009/july/atb1264.pdf

The spring I am referring to is the torque signal regulator valve spring.

The pressure regulator valve spring inner nearly the same size except the diameters are about a millimeter different

Last edited by dash8guru; 03-11-2014 at 12:15 PM.
dash8guru is offline   Reply With Quote
Old 03-11-2014, 02:36 PM   #3
Senior Member

Posts like a Camaro
 
Join Date: Aug 2013
Location: Northern California
Posts: 1,014
Thanked 164 Times in 130 Posts
75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold
Default

Wow this is a tough one, I know you want to get it right because the side cover isn't a fun thing to take off in the car. My suggestion is to go the the wrecking yard and see if they have a 4t65e core they would be willing to let you rob the VB out of so you could do a side by side comparison. I would say go to your local transmission shop and ask for advice but in my experience they get kind of pissy because they missed out on robbing you of 1600bucks to rebuild it.
75 racer is offline   Reply With Quote
Old 03-11-2014, 03:01 PM   #4
Junior Member
Thread Starter
 
Join Date: Mar 2014
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
dash8guru is on a distinguished road
Default

A have talked to a local shop on the phone about sizing the teflon seals on the input shaft and they were really helpful. I may just hit them up again or buy a used ebay valve body just to see what spring is in there.
dash8guru is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
EPC solinoid AGAIN ??? Help goldfinger22 Buick 3 02-21-2013 08:16 PM
2002 4t65e-HD into 1999 4t65e? buckykattnj Performance, Brainstorming & Tuning 6 02-15-2011 07:36 AM
4T65E-HD to 4T65E swap? woodturner2 General GM Chat 2 11-15-2010 08:53 AM
EPC Charity Car Show & The Lot 10-8-10 SpinEm_90 Your Ride: GM Pictures & Videos 7 10-21-2010 09:41 PM
Practice before Spring Break... (or just spring) MOS95B Lounge 3 03-25-2005 11:29 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:25 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.