SuperRatBastid
Member
The 1970 Charger/Coronet factory service manual says to use ATF, and my 2008 manual 5 speed F150 uses ATF. Should I really be using gear oil?
No ATF in the 70, ATF in the 2008. They don’t use the same style of syncro.
The 1970 Charger/Coronet factory service manual says to use ATF, and my 2008 manual 5 speed F150 uses ATF. Should I really be using gear oil?
The 1970 Charger/Coronet factory service manual says to use ATF, and my 2008 manual 5 speed F150 uses ATF. Should I really be using gear oil?
I can guarantee that your 18 spline 4 speed didn’t come with Mobil 1 from the factory not in the owners manual suggesting it be used.
Good luck with that Mix.Lots of guys on here have posted they use two quarts of ATF fluid and then two of your choice of tranny lube and they shift great. Thats what I am planning to use.....
Nice you have learned.I struggled with this question for years with the A833 18 spline transmissions I own. When I first rebuilt mine back in 1980, it had ATF in it. That didn't seem right but agreed with the FSM. I filled it with 80W90 gear oil at the time and it never shifted properly to my satisfaction. Tried 85W140, same issue. Strait SAE 140 was impossible to find at my location so I crossed referenced an ISO equivalent lube oil from work. That work best for years. When I freshened the trans in 2000, I procured needed pieces from Liberty's Gears in Detroit. At that time they indicated that the Mopar (Direct Connection) synchro rings that I had used back in 1980 were not made correctly and was part of the problem I had originally experienced. I used their (Liberty's) supplied synchro rings and they worked great, but I still was using the ISO 140 oil. Moving forward another 20 years, I have just changed all of the fluids in this car. I used the Penzoil GL-4 Synchromesh Fluid (didn't have a source of the ISO 140 anymore) and it seems to be doing the trick so far. GL-5 80W90 went in the Dana.
Nice you have learned.