"Dexron VI is of a slightly lower viscosity when new compared to the prior Dexron fluids (a maximum of 6.4 cSt at 100 Â☌ for Dexron VI and 7.5 cSt for Dexron III), but the allowed viscosity loss from shearing of the ATF during use is lower for Dexron VI, resulting in the same lowest allowed final viscosity for both Dexron III and VI (5.5 cSt) in test. TES-295 is the equivalent of full synthetic Dexron III. You could use 90W140 in the rear for the constant heavy towing, that call is yours. I used Mobil 1 75W90 for my diff's, I got a few cases really cheap on Amazon. But definitely measure it a few change intervals. Some T cases evaporate transmission fluid faster than others due to use and abuse. Measure how much it takes to fill, measure how much comes out, that might change your thoughts on service intervals. Your under warranty, so TES 295 would be just fine, or maybe you better stick with Dex 6 and change it every 30k. Many of us went to motor oil in the transfer case, synthetic 10W30 myself included as suggested by a few of the top transmission builders. The transfer case pump rub was fixed long time ago, your good on that. I go to big truck parts shops directly, prices are usually a lot better for the big truck fluids. I used Allison's factory fill, Castrol Transynd, looking at your chart, I need to change it based on time! Price wise it looks cheaper for a generic Dex 6, I have only bought Dex 6 from the dealer for my wifes Cadi and I just seem to have some type of un explained prejudice against it, probably price. Plus, Walmart rarely has more than 1-2 quarts of 75w-90 available at a time. Some of the gear oil bottles at my local Walmart are questionable. Plus this place gives me great prices on everything else, I like buying from them. I could have gotten a better deal on some Supertech, but still not a terrible price and this is all boxed up and sealed, I can be sure this wasn't tampered with. Six quarts was $58.83 including tax, working out to ~$9.81/quart. I bought some Starfire full syn 75w-90 for the diffs today. Is the pump rub issue still a problem on these or has that been fixed on newer models? I'm thinking I should probably stay with Dex VI until the warranty is up. What do you all think about running TES-295 in the transfer case? As far as I can tell, it specs Dex VI. I also need to change the transfer case and front and rear differentials soon. The Starfire is the thinnest of the two Dex VI products I priced, however both are "full synthetic" and GM licensed and approved.Ģ: Havoline Full Synthetic Multi-Vehicle ATFģ: Shell Spirax S6 ATF A295 (Allison Approved) What would you choose and why? I know that the Allisons do well on most any approved ATF, I'm just looking to hear peoples thoughts. I priced three locally available fluid options today, all prices include tax. I'd say going nearly 3,000 hours on Dex VI is pushing it. I believe GM calls for a 45,000 mile transmission service if the vehicle is operated under severe conditions, but doesn't mention hours. I think I may do a double drain/fill and filter change soon and then a single drain/fill and filter change every 1,000 hours from here on out, that should be about once per year give or take. The truck is still running on the factory fill Dex VI, the spin-on was changed and magnet cleaned at 2,000 hours. The truck is still under the 5 yr/100k powertrain warranty. Lots of short trips/stop and go driving and quite a bit of other various towing.ģ9k miles, 2,6xx hours. 2016 3500 HD Farm truck, frequently tows a 20 ft cattle trailer and a 20+5 gooseneck (roughly Â☒4k lbs loaded) loaded with round hay in the summer.
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