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Sorry to post another thread, but I need to order a diff pinion seal and gasket tonight. And I want to double check it has a 8.8 rear end. It has a 10 bolt I think (not sure). And the fill plug is on the top right next to the driveshaft. It also has axle code 19. Based off this info is it a 8.8?
I’m gonna order some AMSOIL 75w90 oil for it too. Is that good? Winters where I live get to the 50s and summertime can reach 115
And do I need 2 or 3 things of fluid?
I ordered them. I can cancel it still if it’s the wrong one. So if anyone’s got info it’s still helpful. I did research a while ago it lead me to believe it’s the 8.8 3.55. But I want to make sure.
Sounds like you're on the right track. If it has a tag, you can decode it. Ford calls for 5.5 pints (2.75 quarts) of 80w90 gear oil and if it's limited slip add 4 ounces of friction modifier.
Unless someone changed the rear axle, it would be an 8.8 since that was the only one available.
Nothing wrong with using RTV instead of a gasket. I worked at a Chrysler dealer for a few years. Chrysler didn’t use gaskets on differentials or transmission pans but there was a gear oil specific RTV.
If I Jack up the rear end, if I spin one wheel and the other rotates the opposite way then it’s not limited slip? And if it rotates in the same way, it is?
If I Jack up the rear end, if I spin one wheel and the other rotates the opposite way then it’s not limited slip? And if it rotates in the same way, it is?
Yes yours is open differential. l If they both spin the same way it would be Limited Slip so yours is Open Differential.
I use Permatex ultra grey RTV for the diff cover and run 85W-140 oil in the rear axle. Seemed like I had more rear axle issues when I ran the lighter oil.
So I have determined it is not a 3.55 with some help in another thread. It’s most likely a 4.10. I don’t like the high gear ratio. I want to swap it back eventually. What would be the best ratio I know there is 2.73, 3.08, and 3.55. What are the pros and cons of a high and low gear ratio. And what would be best for a daily driver 302 AOD? I want to keep its ability to do truck things, but as of right now the most it’s gonna do is have 2 dirt bikes in the bed. So it’s not doing much. It’s got 31” tires
Based off of a calculator a 3.08 would be best for mpg. But what are the cons of a 3.08 in the world of acceleration, and towing/carrying stuff.
With the 31" tires you're running the 4:10 is just fine for doing "truck things". Going to a 3;90 or a 3:73 is not going to be worth the effort or the cost of doing it.
Rear end parts and work ain't cheap, and no real gain in performance or fuel economy makes it a money flush.
With a 3:08 and 31" tires it will be a complete dog on acceleration.
This is my junkyards price on a assembly. So it's super cheap compared to other prices. But if it still isn't worth it with that price for 3.55 then I won't worry about it.
Would the 3:55 it came with be a waste as well? Or powerless?
It all comes down to what are you looking for out of the truck. Do you want it to be your daily driver with enough juice to get on the freeway and merge in traffic comfortably? Then stay with the 4:10
Do you want it to get every last drop of gas mileage but be sluggish when trying to do the above.. then the 3:55 might suite you better.
Hauling a couple dirt bikes in the bed is not going to drastically affect mileage or acceleration. Trying to pull a heavy trailer will.
What are going to use the truck for the most. Work or fun.
The difference in mileage between the 4:10 and the 3:55 is not going to be much at all, but the 4:10 is a lot more fun to drive.
I'll stick to 4.10. Will my pinion seal fluid and diff cover for 8.8 3.55 still work on a 4.10?
Yes. The gear ratio does not affect the pinion diameter or the rear cover. Fluid is the same as well.
As my ex wife used to say.... It all fits in the same hole.
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