Best transmission fluid - S-10 Forum
 
LinkBack Thread Tools
post #1 of 8 Old 01-17-2019, 11:47 PM Thread Starter
Registered User
 
Yowakawaka's Avatar
 
Join Date: Jan 2019
Posts: 48

User is: Yowakawaka is offline
Garage
Best transmission fluid

Hi everyone. I have a 83 s10 2.8 v6 Rear TWD. I’ve been calling around different places for transmission fluid and have been hearing different things from all of them. I’ve heard dexron 2, 3, 4, and 6. Someone told me dexron 6 is for the newer GM vehicles. Is this correct and what should I be using? I’m looking for a good quality fluid that will take care of my transmission!!!


Zip Em Up and Zip Em Out....
Yowakawaka is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 01-18-2019, 01:23 AM
Boozebag
 
Mad Max's Avatar
 
Join Date: Jun 2009
Location: Baton Rouge, LA
Posts: 8,835

User is: Mad Max is offline
Re: Best transmission fluid

For the most part, the early tucks (like yours) used Dexron III.
You can switch to a synthetic counterpart also ($$).
Remember, the pan only holds between 3 and 4 quarts... the rest is in the converter.
Unless you have a flush done, you will still have old juice in the tranny.
A flush consists of hooking a machine to the transmission coolant lines at the radiator and power flushing the old juice out.

S10 addiction:
1)'82 S10, 383, 700R4, Shorty
2) '85 S10, 3.4, 700R4 4x4 stretch cab (Redneck)
3) '90 S10 2.5, 5 speed shorty
4) '91 S10, Built 3.4, 5 speed shorty (Voodoo)
5) '92 S10, 2.5, 5 speed shorty, (Barbie)
6) '92 S10, 2.5 5 speed, Shorty
7) 1979 LUV, Buick 3.8 V6, TH 350 Shorty.
Mad Max is offline  
post #3 of 8 Old 01-18-2019, 07:20 AM
Registered Offender
 
Join Date: May 2017
Posts: 621

User is: Watthour is online now
Garage
Re: Best transmission fluid

It is generally safe to switch to Dex VI in any 1980+ Hydramatic, including the "T" series transaxles. As Max pointed out, it's going to cost a little more.

If you are changing because of a shifting or performance problem, I would suggest only performing a pan drop to fit in a new filter/pickup and clean/inspect what is exposed. It would also be advantageous to install a drain plug to make future changes a lot cleaner and faster, something like this:




And when the pan and gasket are installed, be absolutely, positively, overnight certain that this hole does NOT get covered:

Watthour is online now  
 
post #4 of 8 Old 01-18-2019, 10:37 AM Thread Starter
Registered User
 
Yowakawaka's Avatar
 
Join Date: Jan 2019
Posts: 48

User is: Yowakawaka is offline
Garage
Watthour

The photos you posted are blocked for me to see. I know the drain plug your talking about. I don’t know the hole you mentioned when everything is back on. Can you elaborate a bit more please?

I just bought the truck so this is the first fluid swap I’ll be doing. Does it matter if the fluid I put in is different from what’s already in there. For example, dexron 3 already in it and I put in dexron 6; or, if valvoline brand is in it and I put in Mobil 1 brand?

If I don’t know what’s in there should I just get it flushed all together? It seems to shift a little rough but overall pretty good.

Zip Em Up and Zip Em Out....
Yowakawaka is offline  
post #5 of 8 Old 01-18-2019, 10:52 AM
Registered User
 
Racer-X's Avatar
 
Join Date: Aug 2017
Location: North Georgia, USA
Age: 55
Posts: 773

User is: Racer-X is offline
Re: Best transmission fluid

Dexron III is what is specified for that year. Nearly any good, new conventional Dex/Merc fluid will do. A "high mileage" formulation might be a good idea, provided it's not a full synthetic fluid.

I'm a believer in regular (30,000 miles) drain and fill with a fresh filter.

The down side to switching to synthetic is that you can discover a bunch of leaky seals (external and internal). The external leaks (tail shaft, input shaft) will drop fluid on the ground and be obvious. The internal leaks will make for poor shifting and poor operation. Worst case, you can lose gears (1st and reverse completely gone is the most common as that's the most used parts that move the most cycles).

If you still want to switch out to a Synthetic fluid, a "flush" will get it all. Drain and fill with a new filter won't change the fluid in the torque converter.

If you can't light up the tires in the first three gears, you need more power.
If you can light up the tires in the first three gears, you need better tires.
Racer-X is offline  
post #6 of 8 Old 01-19-2019, 06:44 PM Thread Starter
Registered User
 
Yowakawaka's Avatar
 
Join Date: Jan 2019
Posts: 48

User is: Yowakawaka is offline
Garage
Re: Best transmission fluid

Cool thanks everyone. I purchased a ATP filter kit and Valvoline Dex III. Ill be changing it out today and I'll be sure to let you know how it goes.
Yowakawaka is offline  
post #7 of 8 Old 01-19-2019, 07:07 PM
B4U Task Force
 
Rhotpursuit's Avatar
 
Join Date: Sep 2003
Location: Spanaway, Wa
Posts: 19,219

User is: Rhotpursuit is offline
Re: Best transmission fluid

.....messy.

U.S.C.G. "Making sure the Navy doesn't get lost since 1790"

Apple Red 96 SS
Rhotpursuit is offline  
post #8 of 8 Old 01-20-2019, 12:37 AM
Registered User
 
Join Date: Dec 2007
Location: Houston, TX
Posts: 15

User is: Hellcat1 is offline
Garage
Re: Best transmission fluid

Quote:
Originally Posted by Yowakawaka View Post
Hi everyone. I have a 83 s10 2.8 v6 Rear TWD. Ive been calling around different places for transmission fluid and have been hearing different things from all of them. Ive heard dexron 2, 3, 4, and 6. Someone told me dexron 6 is for the newer GM vehicles. Is this correct and what should I be using? Im looking for a good quality fluid that will take care of my transmission!!!
Dexron III is what your truck should call for. That being said TSB #04-07-30-037E: superseads all previous Dexron fluids with Dexron VI and is fully synthetic.

Sent from my SM-G892U using Tapatalk

Kenneth R Zink II
2001 Chevy S10 SL 4.3L Turbo SFI - Black Beauty
2000 GMC Jimmy SLT 4.3L SFI - J10
1994 Olds Bravada - Rocket (4.3L CPI...for now)
Hellcat1 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the S-10 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome