Reply
 
Thread Tools Display Modes
 
Old 08-28-2017, 03:09 PM   #1
Platinum Member
 
Join Date: Aug 2015
Location: Utah
Posts: 139
Default Transmission fluid change

The transmission is coming due for a fluid change on my 2004 Chevy 3500 Van based RT 210 Pop.
Has anyone changed over to synthetic fluid?
Any issues or problems?
__________________

Deano is offline   Reply With Quote
Old 08-28-2017, 06:11 PM   #2
Platinum Member
 
Join Date: Aug 2010
Location: Minnesota
Posts: 7,582
Default

Quote:
Originally Posted by Deano View Post
The transmission is coming due for a fluid change on my 2004 Chevy 3500 Van based RT 210 Pop.
Has anyone changed over to synthetic fluid?
Any issues or problems?
I think almost everyone who has done a fluid change lately has moved to the Dexron VI fluid. It is much better stuff, especially for high temps that a lot of us see in the class b's.

The only major issue is getting all the old out to get a complete changeover. Draining the pan, and the cooler will not get even 1/2 out, so it will take several changes to get most changed. Best is to find somone who has their trans flush system setup with Dexron VI. You may only find that at a Chevy dealer. It is always a good idea to put a drain in the pan when you do a change to make the next one easier.

Many, maybe most, of the independents have their flushing systems setup with "universal" fluid which is allegedly good for Dex VI, Honda, Toyota, etc etc all the way up to space shuttles. Personally, I consider trans fluid about the only fluid that I totally agree is needed to meet the actual manufacturer spec, like Dex VI, the specific Honda fluid, etc. The fluids and transmissions are designed together to get the right stick/slip, actuator timing, etc, so it is important to be the same.

I use Valvoline Dexron VI rated fluid which is GM spec tested. The Valvoline universal fluid has not passed the Dexron VI testing and been approved. Other good brands like Amsoil, Redline, Royal Purple, etc have trans oils they "recommend" for use in Dexron VI applications, but they are also have not been tested or approved. They may be fine, they may not be, and just because the say they have warranty doesn't mean they have ever payed one because you can't prove it was the oil that caused the problems.

When I changed over my 1996 Buick Roadmaster with a 4L60E trans,the couple of tiny leaks I had got a bit more, so I had to fix them. Shift rod seal and a cooler line crimp connection.
__________________

booster is offline   Reply With Quote
Old 09-11-2017, 11:40 AM   #3
New Member
 
Join Date: Nov 2016
Location: ca
Posts: 11
Default

Draining only captures a certain percentage of total fluid, not sure of amount. One method I have read is that instead of a transmission flush is to drain and fill, drive 5 miles and repeat 3-4 times. That way you are able to more or less completely change all the fluid.
pearll is offline   Reply With Quote
Old 09-18-2017, 03:52 PM   #4
Platinum Member
 
Join Date: Mar 2014
Location: Herndon, Virginia
Posts: 246
Default

That sounds like a pretty expensive way to change out the fluid...not to say wasteful.
JohnnyFry is offline   Reply With Quote
Old 09-18-2017, 04:08 PM   #5
Platinum Member
 
Join Date: Aug 2010
Location: Minnesota
Posts: 7,582
Default

Quote:
Originally Posted by JohnnyFry View Post
That sounds like a pretty expensive way to change out the fluid...not to say wasteful.
I agree, but there are few good options if you want to get the benefits of the Dexron VI fluid.

The flushing machines will completely change the fluid, but it is hard to find an independent shop that uses Dexron VI and not the universal fluids in their flushing machines. I was not able to to find anyone but the GM dealers who used Dexron VI in their machines, and they are also in the "not inexpensive" category.

I think if I wanted to do a 4L80e like we have in our vans, and make sure I got Dexron VI and completely changed, the dealer may well be best source, especially if you watch for a sale on trans service, which happens fairly regularly around here. The 4L80e uses an in the pan filter, rather than the more modern screen at the valve body, so it does also need to be changed fairly regularly, and would be with a full flush service at the dealer most places.
booster is offline   Reply With Quote
Old 09-18-2017, 04:16 PM   #6
Platinum Member
 
Bruceper's Avatar
 
Join Date: Jul 2014
Location: Manitoba
Posts: 635
Default

Don't do a flush from an oil change type of shop. If you want a flush go to a transmission shop.

An oil change shop will likely not cover you if they mess up. A transmission shop will cover you.
Bruceper is offline   Reply With Quote
Old 09-18-2017, 04:33 PM   #7
Platinum Member
 
Join Date: Aug 2010
Location: Minnesota
Posts: 7,582
Default

Quote:
Originally Posted by Bruceper View Post
Don't do a flush from an oil change type of shop. If you want a flush go to a transmission shop.

An oil change shop will likely not cover you if they mess up. A transmission shop will cover you.
Have you been able to find any in your area that use the Dexron VI in their machines? Unless things have changed in the last few years, rare around here.

As always, the disclaimer on a full machine flush is that if the trans is old and hasn't been maintained, a flush can kill it by breaking loose debris and plugging passages. For those times, best to do nothing or change just the pan fluid until it cleans up.
booster is offline   Reply With Quote
Old 09-18-2017, 04:49 PM   #8
New Member
 
Join Date: Nov 2016
Location: ca
Posts: 11
Default

That is my understanding also. Maybe a drain transmission oil change every 7k miles which will completely change fluid by the 30K miles. The thought is that a transmission flush at a shop is just not that good for transmission. Maybe it really depends on age of transmission.
pearll is offline   Reply With Quote
Old 09-18-2017, 05:14 PM   #9
Platinum Member
 
Join Date: Mar 2014
Location: Herndon, Virginia
Posts: 246
Default

Why is an trans flush not good for the transmission? Exactly how is it done? What downside is there to removing the pan and doing it that way?

Thanks
JohnnyFry is offline   Reply With Quote
Old 09-18-2017, 05:14 PM   #10
Platinum Member
 
Join Date: Aug 2010
Location: Minnesota
Posts: 7,582
Default

To figure how long it takes to change it all (almost, as you will never get to 100%) take the % that gets changed off of how much old is still left.

So if you get 40% of the fluid out, you have 60% old left. Next change will remove 40% of the 60 percent or 24% so 36% left. Next removes 40% of the 36% or 14.4% so 21.6% left. etc, etc, etc.

Some trans will slowly drain some of the torque convert fluid that is trapped in it, once the pan is drained or removed, but it does take a while. I have seen .5-1 quart more come out overnight on some transmissions, so if you are doing a changeover and have the time to let it sit in a clean spot, it can be worth the wait.
__________________

booster is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 04:33 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.