Jump to content
Remove Ads
Welcome Guest! Please read more information about our club!

transmission fluid weight?

chaseincats
chaseincats
in Help Me !!

Featured Replies

Posted
comment_602271

Hi guys,

Going to change my transmission fluid today but can't find a definitive answer on what spec GL-4 fluid to use (75w-90 for example).

Does anyone have a definitive answer?

 

-chase

Link to comment
https://www.classiczcars.com/forums/topic/64232-transmission-fluid-weight/
Share on other sites


Remove Ads
comment_602294
5 hours ago, chaseincats said:

ok, I'll grab that.  2 quarts should fill a '78, right?

Yes,  if it is a 4 speed.   A 5 speed takes slightly more.

The Redline gear oil is very good,  I have used it,  however many of us have switched to AC Delco Friction Modified with great success.  Something to consider ...

comment_602296
15 minutes ago, S30Driver said:

Yes,  if it is a 4 speed.   A 5 speed takes slightly more.

Funny, I never really realized this.  The 1978 FSM has both, for reference.  I wonder where the extra capacity is.  Bigger rear case?  Or did they just move the fill hole up to keep the new gears covered.

image.png

Edited by Zed Head

  • Author
comment_602297
59 minutes ago, Zed Head said:

Funny, I never really realized this.  The 1978 FSM has both, for reference.  I wonder where the extra capacity is.  Bigger rear case?  Or did they just move the fill hole up to keep the new gears covered.

image.png

wow ya that is interesting

weird

Create an account or sign in to comment

Go to topic listing
Remove Ads

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.