A real no-brainer here. Low fluid levels might be a sign of needing new fluid. Your transmission shouldn’t lose fluid easily, but over time it can, especially if a leak occurs. If your transmission fluid is lower than it should be, it’s time to empty out the remains, and give it the ol’ redo. Show
Fluid leaksThis kind of goes hand in hand with low fluid, except you might be more likely to spot a leak than to get under the hood and check the levels. That’s normal. Now, leaks aren’t fun, under your car or anywhere else. They’re a sign of a problem. For your car, that problem could be a leaking transmission. Dark colored fluidLet’s establish a baseline here. Automatic transmission fluid is usually pink or red to begin with, which looks pretty cool. However, if it starts looking dirty, brown, or black, well Houston, we have a transmission fluid problem. Performance problemsIs your automatic transmission driving like when you tried to drive a stick shift, thinking it couldn’t be that hard? Well, that’s not a good sign. If your transmission is making weird noises, or just having a hard time changing gears, then you may have a transmission fluid issue. Actually, the first question is “Do I need to change my transmission fluid at all?” For the answer, consult your GMC Owner’s Manual. Unless there’s a leak or a problem, some newer transmissions are designed to never need a fluid change. But let’s say your car does need a transmission fluid flush as part of preventive maintenance. The top reason to change it is to keep your transmission operating at its best. Like any other fluid such as engine oil, transmission fluid becomes less effective over time. Stop-and-go driving, towing or other high-stress conditions can shorten its life even further. Unlike other fluids, however, transmission fluid doesn’t just lubricate the transmission parts, it also acts as hydraulic fluid, helping keep the transmission cooler and helping with shifts. In a practical sense, the most important reason to perform preventive maintenance on your transmission comes down to dollars and cents: getting a transmission fluid flush might cost you a few hundred dollars, but a new transmission will cost thousands. Just curious as what your guys' thoughts are on how often you change the transmission fluid. I've always heard do it often or never do it at all. How often do you folks change yours? Every 30k? 50k? 100k?
I'm not 100%, but I thought the GM maintenance schedule recommends 50k. I know it also depends how much you tow, etc. Just wondering about overall longevity.
Link to commentShare on other sitesMore sharing options...  ewbldavisPosted April 8, 2016 ewbldavis
Posted April 8, 2016 I've always followed the 60K rule.
If older/high mileage vehicle that hasn't been done, then don't do it. Otherwise, 60K seems to work.
Link to commentShare on other sitesMore sharing options... gone_fishingPosted April 8, 2016 gone_fishing
Posted April 8, 2016 I'm at about 64k right now and plan to do it soon. Was planning on pumping fluid out through the dipstick tube. Would do this a couple times. Maybe around 100k I would drop the pan and change the filter.
Link to commentShare on other sitesMore sharing options... Rkaroll953Posted April 8, 2016 Rkaroll953
Posted April 8, 2016 yea im curious too. personally i would not want it flushed because ive heard horror stories but i would def like it changed around 30-50. maybe every 30 put a new filter and the 6-7 quarts you lose? the trans run really hot i wonder how that effects the life of the oil?
Link to commentShare on other sitesMore sharing options... glcbnPosted April 8, 2016 glcbn
Posted April 8, 2016 I'm wondering if the way the truck is driven and what it is subject too would be the determining factor of when or even if the fluid should be changed. Granted these are more advanced than the older 4L60-E's, but the principles are the same.
My previous truck was a '98 5.7 Silverado. Just the fluid was changed at 70,000. Never touched it after that. For eight years of its sixteen year life, I hauled two trailer loads of hay every summer. Probably close to max weight for a sixteen foot tandem with brakes. It was used for lighter things here and there, but the hay was the heaviest. The fluid was never touched for the remaining 225,000 miles I put on it before it was traded in March of 2014. If it wasn't for what I had to add when I replaced a cooler line, I would have never had to add a drop. It was as red as the day it was put in.
Link to commentShare on other sitesMore sharing options... redwngrPosted April 8, 2016 redwngr
Posted April 8, 2016 I like the severe service GM schedule in the OM.
Transmission fluid and filter, transfer case fluid every 45,000 miles(72,000km).
Link to commentShare on other sitesMore sharing options... seamus2154Posted April 9, 2016 seamus2154
Posted April 9, 2016 Anyone have a DIY on the 8 speed trans?? Just read it doesn't have a dipstick or fill tube?? I know on my Mercedes and BMW you have to fill to overfill at a certain temp while running. A real PITA. Hope the GM 8 speed isn't that bad, pan seems very accessible. Thanks
Link to commentShare on other sitesMore sharing options... Black02SilveradoPosted April 9, 2016 Black02Silverado
Posted April 9, 2016 With today's fluids every 50k is a good rule to follow. Before synthetic ATF every 30k was a good general rule.
Link to commentShare on other sitesMore sharing options... Debra in CaliPosted April 9, 2016 Debra in Cali
Posted April 9, 2016
My hubby wants to do a transmission oil change at 15,000 to switch over to the Amsoil synthetic. We took it to our favorite trans shop that we really trust. One of the mechanics was telling me that if we switch it over to Amsoil (or anything else for that matter) that it will void the warranty. Got any input or information on that????
Link to commentShare on other sitesMore sharing options... WheeliePosted April 9, 2016 Wheelie
Posted April 9, 2016
You could ask your service manager at your dealer.Or call a couple of them to see if you get the same answer.
wee
Link to commentShare on other sitesMore sharing options... WheeliePosted April 9, 2016 Wheelie
Posted April 9, 2016
So change the factory tf at 30,000?
wee
Link to commentShare on other sitesMore sharing options... gabekalpPosted April 9, 2016 gabekalp
Posted April 9, 2016
I have a ton of Allison trans in my fleet, for warranty purposes we are required to run a spec synthetic oil or else we loose warranty. So I'd imagine that is a correct statement
Sent from my iPhone using Tapatalk
Link to commentShare on other sitesMore sharing options... elcaminoPosted April 9, 2016 elcamino
Posted April 9, 2016 (edited)
Took the GMC dealer several hrs to flush mine. Had to be done on the hoist. I was told the ATF has to reach a certain temp before it circulates. In other words, not an easy DIY. Local trans shop was unwilling to do it, a big pita was what they said.
Btw - The 8-sp requires Dexron-HP, not Dexron VI.
HP - High Performance Edited April 9, 2016 by elcamino
Link to commentShare on other sitesMore sharing options... elcaminoPosted April 9, 2016 elcamino
Posted April 9, 2016 (edited)
That's a fear tactic. OEM's and dealers want you to think you have to use OEM-Branded lubricants, which are typically more expensive, to comply with the warranty. Generally, the public is unaware that it is illegal for a vehicle manufacturer to tie the warranty of its product to the use of the manufacturers own brand of lubricant. Federal law seeks to ensure competition within the marketplace and that specifically includes guaranteeing continued warranty coverage outside of the OEM-branded lubricants. In short, you have the right to use the oil of your choice. If the lubricant did not cause the problem, the OEM warranty cannot be voided, period.
A warrantor cannot, as a matter of law, avoid liability under a warranty where a defect is unrelated to the use by a consumer of ‘unauthorized’ articles or service. Edited April 9, 2016 by elcamino
Link to commentShare on other sitesMore sharing options... elcaminoPosted April 9, 2016 elcamino
Posted April 9, 2016 (edited)
That an (extra cost) extended transmission coverage offered by Allison in which you agree to use their recommend fluid (Castrol Transynd) as a condition of the extended coverage. The coverage is not available unless you use that fluid but you are not required to use it if you do not have the optional coverage.
Terms and Conditions of Allison Extended Coverage
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2014 gmc sierra 1500 transmission fluid change
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