The trans flush debate. Pictures on Page 3 - Page 7 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

View Poll Results: Flush the clutch material out of the trans or not
flush the trans even if the fluid has 150,000 miles on it 20 68.97%
dont flush it, the broken down material may help the trans last longer 9 31.03%
Voters: 29. You may not vote on this poll

Reply
 
 
 
Thread Tools Search this Thread
Old 02-01-2007, 01:18 AM   #61
Junior Member
 
Join Date: Jun 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
2000SilverBullet is on a distinguished road
Default

$2000 for a rebuild and $2000 in performance parts.
2000SilverBullet is offline   Reply With Quote
Old 02-01-2007, 01:26 AM   #62
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Lethbridge, Alberta, _______Canada._______ West Coast Bonneville Fest ___05,06,07 Survivor___
Posts: 8,134
Thanks: 0
Thanked 0 Times in 0 Posts
SSEimatt93 is on a distinguished road
Default

2000 for a rebuild
Performance parts all included
INCLUDING
New Tourque Converter
Thicker clutch pacs
Aftermarket 4th input shaft
Modified shift plate
Modified Valve body
Trans Go Shift kit
Aftermarket hardend Reverse Reactor shell
Free modification of stock PCM line pressure settings
Not to bad IMO
SSEimatt93 is offline   Reply With Quote
Old 02-01-2007, 03:52 AM   #63
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jul 2004
Location: Twin Falls, Idaho
Posts: 7,545
Thanks: 0
Thanked 1 Time in 1 Post
Hans is on a distinguished road
Default

Quote:
Originally Posted by 2000SilverBullet
$2000 for a rebuild and $2000 in performance parts.
no.


I'd put a max of 1500 into performance stuff. High 14s or Low 13s is all I'm going for. Its going to be stock until winter is over, I prefer the keep the 93 and take it easy on the 2000.

Its a nice car and the trans works perfectly right now so I'm just having second thoughts until I have the money to put into the trans. Basically I'm trying to find documented cases of transmissions failing shortly after a flush, specifically the 4t65s, Not many of them have the miles I have on my fluid so its a bit tough to get good information.
Hans is offline   Reply With Quote
Old 02-01-2007, 10:47 AM   #64
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

I just change transmissions

Seriously though, over time, mileage and hard (read hot) running, clutch material will begin to infiltrate the transaxle and the fluid loses its detergent and cleaning power. The fluid will also become thicker to an extent as particulate matter becomes absorbed into it.

When done on a regular interval flushing or even pan drop changes with new fluid will help keep the detergent and cleaning abilities up as well as the ability to hold particulate matter (much like engine oil) embedded in it.

The problem comes when high mileage transmissions that have never had a fluid change and have worn clutches or levels of clutch material beyond what the fluid can hold floating around in the transaxle get a blast of fresh fluid and detergent cleaning power. Sludging or clutch material unable to be suspended in the trans fluid because of saturation can sometimes mask gasket leaks or weak/worn clutches because they can physically keep fluid from leaking through the holes in gaskets or because the fluid is thicker and heaver can help clutch packs grip. When new thinner fluid is added it can pick up all that extra particulate matter and clean better (new detergents) which can reveal the gasket leaks or since the fluid is thinner can show old/worn clutches by allowing them to now slip.

My advice, if the trans has high miles but is functioning properly and you have never changed your fluid, leave it be until it goes. If you change your fluid at periodic intervels then you know what your fluid is like and how much material is in your pan eveyrtime you do it so it gives you an idea on how the trans is holding up.
Rogue is offline   Reply With Quote
Old 02-02-2007, 09:29 PM   #65
Junior Member
Posts like a Ricer Type-R
 
Join Date: Jan 2007
Location: Chicago, IL
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
SaturdaysGS is on a distinguished road
Default

Heres a quote from Trannyman95 (a very reputable 4t65e tranny builder on ClubGP.com).

"You heard wrong then, and fortunately this is what most people think. A flush does NOT use high pressure or flush anything. It hooks in line with a trans cooler line between the transmission and radiator and there is a bladder in the flush machine that will collect old fluid and replace with new fluid. It works off of the pressure within the cooler lines itself, which is roughly 10-40 psi, there is NO additional pressure, it does NOT flush anything inside the trans, all it does is accumulate old fluid and replace with new. With that said and hopefully a better understanding here is why problems can arise from this.... A lot of shops never check trans fluid levels before or after the flush, if it came in low it goes out low, or lower which obviously will cause damage. I have witnessed this numorous times and had to rebuild transmissions because someone went to a shop that didnt check and ended up going to court over it. Another problem is that a trans with very high mileage and burnt fluid that goes in for a flush has chemically changed inside and new fluid has strong detergents that attack things and the clutch linings can literally fall off of the clutch plates and end up in pieces laying in the pan or filter. I have nothing against flush machines BUT I always would drop the pan and change the filter after a flush, or honestly prefer not using a flush machine and just drop the pan and change the filter and fluid. I feel this a better option for two reasons, One you are replacing the filter that needs changed anyways and Two you arent replacing all of the fluid and give new fluid and old fluid a chance to combine which is easier on clutch materials. "

You decide.
SaturdaysGS is offline   Reply With Quote
Old 02-02-2007, 09:37 PM   #66
Senior Member
True Car Nut
Thread Starter
 
Join Date: Jul 2004
Location: Twin Falls, Idaho
Posts: 7,545
Thanks: 0
Thanked 1 Time in 1 Post
Hans is on a distinguished road
Default

I take it, if the 4th gear is gone, a trans fluid flush would not help that whatsoever. If I remember seeing pictures of that 4th gear hub or whatever it is and seeing how it wears out, I dont see how a trans flush would bring it back, As far as shifts and everything else, they are still perfect up to highway speeds when it refuses to drop into OD. There is no slipping as far as gear to gear either so It'd be nice to leave it that way for as long as possible.
Hans is offline   Reply With Quote
Old 02-02-2007, 09:40 PM   #67
Senior Member
Posts like a Northstar
 
Join Date: Jan 2006
Location: Charleston S.C.
Posts: 560
Thanks: 0
Thanked 0 Times in 0 Posts
PEARL_JAM is on a distinguished road
Default

The very best thing you can do is first flush the trans, then change the filter.
PEARL_JAM is offline   Reply With Quote
Old 02-02-2007, 10:14 PM   #68
Junior Member
Posts like a Ricer Type-R
 
Join Date: Jan 2007
Location: Chicago, IL
Posts: 19
Thanks: 0
Thanked 0 Times in 0 Posts
SaturdaysGS is on a distinguished road
Default

Quote:
Originally Posted by Hans
I take it, if the 4th gear is gone, a trans fluid flush would not help that whatsoever. If I remember seeing pictures of that 4th gear hub or whatever it is and seeing how it wears out, I dont see how a trans flush would bring it back, As far as shifts and everything else, they are still perfect up to highway speeds when it refuses to drop into OD. There is no slipping as far as gear to gear either so It'd be nice to leave it that way for as long as possible.
Thats how I take it as well. I actually lost 3rd gear on my OEM tranny, and I drove the car around like that for 200 miles, and I could have went longer I'm sure, but the aftermarket warranty picked up the tab with a 2200 GM remanned tranny, so we had it done when it was convenient for us. I had zero problems other then crappy highway gas mileage. I believe AnnilihatorGTP (sp) had lost 4th gear, and had been driving it like that for several thousand miles, he actually didnt know he lost 4th until he posted up about his crummy highway gas mileage.
SaturdaysGS is offline   Reply With Quote
Old 02-03-2007, 02:06 PM   #69
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Quote:
Originally Posted by Hans
I take it, if the 4th gear is gone, a trans fluid flush would not help that whatsoever. If I remember seeing pictures of that 4th gear hub or whatever it is and seeing how it wears out, I dont see how a trans flush would bring it back, As far as shifts and everything else, they are still perfect up to highway speeds when it refuses to drop into OD. There is no slipping as far as gear to gear either so It'd be nice to leave it that way for as long as possible.
Yes you have lost the 4th gear due to the splines.. Nothing will help it at this point.. Sorry to say

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 02-03-2007, 02:46 PM   #70
Senior Member
Posts like a Northstar
 
Join Date: Jun 2005
Location: Yulee , FL ___ SEBF Survivor
Posts: 700
Thanks: 0
Thanked 0 Times in 0 Posts
ChaseSmith is on a distinguished road
Default

Just some food for thought, one of my friends drives a Jeep Grand Cherokee, and his tranny took a dump on him, leaving him stranded (tranny would slip so bad, the car wouldn't move). I went to the restaurant parking lot it was sitting in the middle of, dropped the pan, replaced the filter, filled with fluid, and some Lucas. Car drove right home, which was the goal, but the lazy bastard drove it for like a month. Granted it was still slipping, but drivable.

Then it happened again, I did the same thing, it drove to my house and got a junkyard tranny. Good as new............... Then he flipped it two weeks later and got a new Jeep.
ChaseSmith is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
GXP transmission flush, & flush in general SAMzGXP General GM Chat 32 07-19-2011 06:41 PM
To flush or not to Flush lunchboxx 1992-1999 22 09-08-2008 10:49 AM
All in a days work: (more pics page 2, VID and pics page 3) willwren Your Ride: GM Pictures & Videos 53 06-19-2007 12:25 PM
Dyno HP page like the 1/4 mile time page Rogue Forum updates and suggestions 7 01-05-2004 03:07 PM
TRANS FLUSH AND B&M TRICKSHIFT Performance, Brainstorming & Tuning 14 10-31-2003 07:49 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 02:48 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.