Gear oil for '73 Dodge D200 manual

[Lubener]

I am seeking a gear lubricant (GL-4) for my NP435 manual transmission which is in my 1973 Dodge D200 pickup. It holds 4.5 quarts and I am looking for something suitable that won't break the bank.

 

[GSCJR]

Pennzoil 75w-90

 

[Lubener]

Pennzoil 75w-90

Isn't that a GL-5 lubricant?

 

[4WD]

Some are dual compatible

https://www.walmart.com/ip/Valvolin...6?classType=VARIANT&athbdg=L1600&from=/search

 

[GSCJR]

Not as far as I can tell @Lubener:

https://www.pennzoil.com/en_us/prod...on-fluids-axle-oils/platinum-gear-75w-90.html

 

[nwjones18]

Some are dual compatible

https://www.walmart.com/ip/Valvolin...6?classType=VARIANT&athbdg=L1600&from=/search

What gets me is the ones that are "dual compatible" always say "non-synchronized manual transmissions" which to me means it isn't safe for yellow metals in synchronized transmissions which is what everyone actually has.. This led me to seek out Redline for the transmission in my Mazda. I will say that when I changed a CV axle I lost a quart of trans oil I wasn't expecting and I topped it off with Supertech Synthetic 75w-90 I had on hand expecting to do a full change later. The thing shifts the best it ever has with he 50/50 mix of supertech/redline and I've just left it alone..

https://www.walmart.com/ip/Super-Te...1_T6JvJE06d-od&athancid=775470594&athena=true

Super-tech conventional 80w-90 says its GL-5 but specifically states its safe for copper/bronze.. Its all sort of confusing to me.

 

[dnewton3]

https://www.pennzoil.com/en_us/prod...ls/synchromesh-manual-transmission-fluid.html
This is the PZ product for manual Synchromesh applications.

Other brands have similar products.

These are not often carried on the shelf, mainly because manual trans cars/trucks are a dying breed. But you could have any parts store order for you.