1/17/2024 0 Comments Flush transmission fluid![]() Also I'm going to use ZF's lifeguard fluid as I don't want to take a chance with any potential issues not using the correct fluid.Necessary cookies are absolutely essential for the website to function properly. I think we need to calibrate our terminology as for these transmissions we should say drain and fill not flush and fill because we're not flushing anything on these. The pan for the truck is available on Rock Auto for $130 from dorman but the Alfa I needed to buy it from FCA for $300. Some things I have found while prepping for the job. I'm looking to do my tranny fluid change in my Alfa soon as it has the same ZF 8HP75 in it as the truck. ![]() I just did my 18' Alfa Romeo rear diff and after 20k it was very black hence why I thought the truck may have needed it. The rear diff looked a little milky and was dirtier but not really needed as well. I used Mobil 1 75w-90 GL5 for the rear, fluid level was Ok.įor the front diff there was minimal clutch wear and wasn't really needed but since it was low I'm glad I did it. The front diff was actually low with no visible leaks and I ended up using Redline 75w-85 GL5 gear oil (the front diff is made by ZF). I just wanted to share my experience as I just changed my front and rear diff fluid with 10k on the clock. At the same time, I question the need for these measures on a 1/2-ton truck that doesn’t see much abuse. Needless to say, I’ve never had transmission problems following this approach. But you also “flush” the entire system without putting any stress on it. Using this approach, you run through some extra fluid. Repeat until the fluid going into the bucket matches the fluid going into the hole. Let the truck pump itself down a few quarts, then add the same amount to the fill hole. Remove the return line from the oil cooler, direct it into a bucket and start the truck. Then, regardless of whether you changed the filter, proceed to have the truck flush itself. Change the filter if needed, but keep in mind that this doesn’t clear out all fluid. I used what has been documented as the “Hoot” method. I changed around every 25-50K miles, mostly due to age (this fluid can go MUCH longer, even in commercial applications). While it was pricy (think “liquid rubies”), it has very impressive performance characteristics. ![]() In my previous trucks (GM 3/4-tons), I ran Castrol/Allison TranSynd. I've experienced the same thing with differentials/transfer cases over at Ford, they have several models which have no drain plug and Ford doesn't recommend AWD fluid (diff/transfer) changes but they burn up to the tune of $1600. ![]() There's a lot of discussion over fluid breakdown with heat, moisture etc and how nothing is "lifetime" in regards to fluids. It's been debated on other threads and forums but the consensus I've seen is that to a manufacturer, "lifetime" is just to get past the warranty. I'm not sure exactly but there is a specific procedure that's different from the 6 speed. ![]() I've read over the years that on the 8 speed you must lift the rear end to get all the fluid to the correct level. Someone on asked the same question last year and a reply said: "Drop the pan and change filter. Agree that for the casual driver, a diff fluid flush/change is not needed for quite awhile. There's a thread somewhere where he talks about it. ![]()
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