 
     |
| GM Synchromesh transmission fluid question (Page 1/4) |
|
Rsvl-Rider
|
DEC 23, 04:18 PM
|
|
I have just replaced a snapped passenger side CV axle on an 86 GT with a 3.4 swap and a Getrag 5 speed. I drained the tranny fluid so that I can add all new GM Synchromesh fluid, as is highly recommended by so many on the forum.
I couldn't find the GM product locally so I ordered it from Amazon.
The picure of the label on the Amazon page simply states "Synchromesh Transmission Fluid". Upon receipt of the product I see that this label specifies it as "SAE 75w-80 Synchromesh Transmission Fluid". Different labels, but both labels have the same part number "10-4006"
I believe the original spec for the tranny was 5w-30 transmission fluid.
Did I get the right stuff???
Thanks for any help, and Happy Holidays!
|
|
|
|
olejoedad
|
DEC 23, 07:33 PM
|
|
|
I always ran Mobil One 5w-30, shifted great for 100K+ miles.....
|
|
|
|
fieroguru
|
DEC 23, 09:28 PM
|
|
|
Engine oil and gear oil have different viscosity scales.
|
|
|
|
cvxjet
|
DEC 23, 09:37 PM
|
|
I swapped a Getrag into my 1985 SE V6 in 1999...used motor oil in the trans for 10 years. Then a friend told me about GM synchromesh fluid....starting using that and transmission shifted much better.
I would never use anything but the Synchromesh fluid- all of the "Tonda" guys now use it because it works so good.
I believe Pennzoil and a couple of other companies make the stuff at a cheaper price....
|
|
|
|
Rsvl-Rider
|
DEC 23, 10:24 PM
|
|
| quote | Originally posted by cvxjet:
I swapped a Getrag into my 1985 SE V6 in 1999...used motor oil in the trans for 10 years. Then a friend told me about GM synchromesh fluid....starting using that and transmission shifted much better.
I would never use anything but the Synchromesh fluid- all of the "Tonda" guys now use it because it works so good.
I believe Pennzoil and a couple of other companies make the stuff at a cheaper price.... |
|
So, am I hearing that synchromesh is all the same and I am good to go with the 75w-80?
|
|
|
|
cvxjet
|
DEC 24, 12:58 AM
|
|
Originally, the spec was for motor oil.....so approx' 5W-30 which is typical of motor oils....The GM/Delco Synchromesh oil is a whole different animal- and was specifically designed to help manual transmission SYNCHROS work properly....
Can you post a picture of your bottle of fluid?
|
|
|
|
Rsvl-Rider
|
DEC 24, 04:24 AM
|
|
| quote | Originally posted by cvxjet:
Originally, the spec was for motor oil.....so approx' 5W-30 which is typical of motor oils....The GM/Delco Synchromesh oil is a whole different animal- and was specifically designed to help manual transmission SYNCHROS work properly....
Can you post a picture of your bottle of fluid? |
|
I just texted you a photo from my phone. I'll try to upload the picture here tomorrow if needed.
|
|
|
|
fieroguru
|
DEC 24, 08:21 AM
|
|
|
|
theogre
|
DEC 24, 09:43 AM
|
|
Pennzoil/QS has it & < $ then GM dealers.
⚠️ Warning: Most car's Manual Trans oil Is Not "Gear Oil" & using GO can ruin them because have Braze/Bronze parts. Not just GM but many other brands.
Because Most GO's have a lot of Sulfur & other additives that "eat" Braze/Bronze, plastic & other parts.
Also see https://web.archive.org/web...cast.net/~fierocave/ Manual Trans Fluid------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
|
|
|
|
Raydar
|
DEC 24, 10:14 AM
|
|
| quote | Originally posted by Rsvl-Rider:
...
The picure of the label on the Amazon page simply states "Synchromesh Transmission Fluid". Upon receipt of the product I see that this label specifies it as "SAE 75w-80 Synchromesh Transmission Fluid". Different labels, but both labels have the same part number "10-4006"
I believe the original spec for the tranny was 5w-30 transmission fluid.
Did I get the right stuff???
|
|
The original spec did indeed call for engine oil.
Synchromesh has become a popular replacement. For good reason, it would seem.
I've got some of the Pennzoil stuff down in the garage. I'll check it later. It doesn't seem to be 75W-80, from what I can tell.
Here's an article...
https://bobistheoilguy.com/...s-gm-version.104875/
And another...
https://bobistheoilguy.com/...sembly%20engagement.
Reader's Digest version...
Based upon the second article, I'd probably go ahead and run it. The worst that will happen is that it will suck, and you'll have to use something else.[This message has been edited by Raydar (edited 12-24-2023).]
|
|
|
