LS Differential lube in a '68 diff?
Thread Starter
Racer
Joined: Jun 2005
Posts: 409
Likes: 13
From: Lavonia Georgia
LS Differential lube in a '68 diff?
I just changed the pinion seal in my '68 and was shopping in my lube rack to see if I had anything suitable to do the fill. Turns out I've got quite a selection including some GM 90W LS diff lube (additive is already added), and some Chrysler 75W-145 with separate additive vials. Also have some basic Pennzoil 90W and some Red Line 90W. Yes, I know....I'm been maintaining my vehicles for years so I've got stuff.
Anyway, I could go out and buy some GM additive and put in the Red Line or Pennzoil. But, I'm thinking the LS 90W already has an additive package and may work just fine in an old diff.
Has anyone tried new style GM LS diff lube in our older stuff, or have thoughts on why it either might or might-not work well?
Perhaps even the Chrysler lube. It goes in my limited slip '12 Grand Cherokee. I forgot I'd already gotten enough to do a change and bought more. I'm not due another change for quite a while. I know Gary (GTR1999) used 75W-145 in all his builds. I could use their mix or use their base and get some GM additive.
I'm thinking worst case I do a fill with it, drive it a few miles, do some figure 8's and see what happens. They're both correct weight full synthetic so it isn't going to burn up. If it chatters or binds , I could flush it and put in old school lube. Thoughts?
Anyway, I could go out and buy some GM additive and put in the Red Line or Pennzoil. But, I'm thinking the LS 90W already has an additive package and may work just fine in an old diff.
Has anyone tried new style GM LS diff lube in our older stuff, or have thoughts on why it either might or might-not work well?
Perhaps even the Chrysler lube. It goes in my limited slip '12 Grand Cherokee. I forgot I'd already gotten enough to do a change and bought more. I'm not due another change for quite a while. I know Gary (GTR1999) used 75W-145 in all his builds. I could use their mix or use their base and get some GM additive.
I'm thinking worst case I do a fill with it, drive it a few miles, do some figure 8's and see what happens. They're both correct weight full synthetic so it isn't going to burn up. If it chatters or binds , I could flush it and put in old school lube. Thoughts?
