Changing auto transmission oil on 72?
what type of oil should i use for my Th350 automatic transmission 4x4? Does Dex/merc work or just Dexron atf, any opinions, thanks
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Re: Changing auto transmission oil on 72?
Buy the cheep one
Dexron is for GM and Dex/Merc is for GM and Ford |
Re: Changing auto transmission oil on 72?
So it doesn't matter either oil works right? Thanks
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Re: Changing auto transmission oil on 72?
:hi2: and welcome to the boards slammed....I found this thread that discusses your exact question....hope it helps ya...
http://67-72chevytrucks.com/vboard/s...d.php?t=520209 |
Re: Changing auto transmission oil on 72?
Get the cheap auto parts store brand Dexron. The new Dexron is compatible with old transmissions.
Gary |
Re: Changing auto transmission oil on 72?
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Cheap Aftermarket Dexron III "type" fluids are labeled DEX/MERC, And are NOT approved by any OEM. These fluids do work, BUT they are not tested to any standard, No viscosity or oxidation stability test. You have to trust a "bargain basement" fluid maker for their word. Stay away from Dexron VI ATF, It has caused seal damage/hardening in some transmissions that were made before 2006, GM says its backward compatible, But they are not fixing any seal damage. The ONLY Dexron III fluids to have a OEM licence are TES 295Fluids approved by Allison. TES 295 Approved Automatic Transmission Fluids. Castrol/Allison........................TranSynd BP Lubricants.........................Autran Syn 295 Cognis Corporation..................Emgard 2805 International..........................Fleetrite Synthetic ATF ExxonMobil.............................Mobil Delvac Synthetic ATF John Deere & Company.............HD SynTran Volvo Trucks North America.......Bulldog Synthetic ATF |
Re: Changing auto transmission oil on 72?
Is Dexron VI the new fancy synthetic stuff? Because I was told by a local shop to use the new synthetic stuff in my freshly rebuilt 4L80E (production date circa 1994, but rebuilt in 2010) on the initial fill. I already had plenty of stock of Dexron III in my garage, so I used that instead. It didn't feel right using an untried (by me) fluid in an older style trans that I just spent $$$$ to rebuild. I knew III would work, so I used it. I've also read that the synthetic stuff is great to run in any trans. Now I'm worried about what you are saying. Luckily I wasn't a guinea pig...
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Re: Changing auto transmission oil on 72?
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It has a special additive package to deal with "clutch to clutch shifting". It is labeled a synthetic.....DEXRON-VI is not synthetic. It is made from a blend of Group II and Group III base oils plus the Dexron VI additives package. It does not contain any PAO (polyalphaolefin) found in group IV base oils. A "true synthetic" uses Group IV base oils. All TES-295 approved fluids use Group IV base oils plus a Dexron III additive package...Making them a Fully Synthetic Dexron III fluid. |
Re: Changing auto transmission oil on 72?
Good info clinebarger!
Gary |
Re: Changing auto transmission oil on 72?
:agree:
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Re: Changing auto transmission oil on 72?
Great info indeed.
But OK, I can be dense sometimes........ so bear with me. This (link below) is what my trans shop recommended for my 4L80E. I did NOT use this. Instead I used a supply of Dexron-III that I had laying around. http://www.wolfshead.com/specsheets/trans.pdf Quote:
Interestingly, the new fad is to indeed switch to using this "synthetic" Dexron-VI...everybody is praising it on other forums for how much longer it's "service life" is. Basically, it's all hype then and should not be used in older transmissions? I want to get to the bottom of this debate. I'm all for not following the fads if I'm going to damage an older transmission........... |
Re: Changing auto transmission oil on 72?
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GM would never admit to screwing up! Not that Dexron VI is a bad fluid....Its just not 100% backward compatible. The double "service life" claim is B.S......Most ATF's that claim the be full synthetics use ONLY group III base oils.....Mobil 1 ATF is a good example. If you consider group III base oils "synthetic" Dexron VI is at best a synthetic blend????? |
Re: Changing auto transmission oil on 72?
Thanks for the information fellow chevy heads
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Re: Changing auto transmission oil on 72?
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Re: Changing auto transmission oil on 72?
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http://www.allisontransmission.com/d...duct/1099B.pdf |
Re: Changing auto transmission oil on 72?
This forum is great. Thanks Cline. Great info. My instincts were right not to trust what I read but rather trust other people's experience. I'll just leave the Dexron III in there and change it every 30K miles or 5 years then. Forget the expensive VI on my older stuff. I'll just put the VI in my Caprice PPV (6L80E) when that service interval comes due.
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Re: Changing auto transmission oil on 72?
Thanks for the great info clinebarger, it's now a part of the FAQ's here : http://67-72chevytrucks.com/vboard/s...d.php?t=523334
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