Posted: 11/25/2011 11:27:30 AM EDT
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Afternoon guys/girls, hope everyone had a good thanksgiving.
Anyway, I've been reading up on when to do a flush and several people have several ideas. Even mechanics differ. Does anyone here own a sierra? I have an 07 v6 auto with 85k (never flushed). Should I flush it? Should I not? Sometimes as I give it gas the pedal feels like it yanks/jumps, normal or related to the topic? Any help is appreciated. I'm not 100% truck savvy. |
easy job you can do yourself .Drop the pan,change the filter and gasket .Refill with propper trans fluid ,repeat every 30000 miles . Most shops will flush the fluid without changeing the filter ,to make the job go fast and maximise profit . On an high mileage vehicle that has never had a trans filter and fluid changed you need to change the filter . In a perfect world you would have changed the fluid and filter every 30 to 40 thousand miles . You will not get all the old fluid out of the torque converter unless you suck it out ,but if you you just keep changeing the fluid and filter every 30000 miles you'll be fine . A big external trans cooler is a real good idea in AZ on a truck . Also your DEXCOOL will not last 100000 miles ,you should flush the coolin system change the thermostat and fill it with 50/50 Dexcool and distilled water .If you want to keep the truck running you need to keep it serviced.You can get 250000 miles on the engine and trans without a rebuild if you service it .
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| With the heat and traffic both in Tucson and Phoenix, I shoot for flushing the tranny and changing the filter every 30K. While that isn't always possible try to keep if somewhere near there. While it isn't a difficult job, it can be messy and if you live in an apartment, it's near impossible to find a place to do it. The dealer want a fortune to do it, but you usually can get it done at the oil change places for a pretty good price. Look for coupons to cut the cost. I'd try to find a independent shop near you if you can't find a place to do it yourself. Youtube has videos showing what to do. Watch them and you'll see what I mean, it's just not that difficult. Best of luck. |
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Transmission flushes are completely different than the "Drain, replace filter, and refill method" many are talking about
Flushes use a machine that exchanges old fluid with new using the transmission fluid pump. Flushed entails actually exchanging all 10+ quarts (there are easily 6 quarts in the Torque converter and the only way to change it is with a flush, unless it has a drain plug which 99% do not) Drain and fills only drain the fluid in the pan (usually around 6 quarts) Will |
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A flush can cause issues down the road, that is why I prefer this method I was doing research on my Allison tranny and I found direct guidance from a retired engineer from Allison. He said for that tranny they do not recommend the flush as it risks hurting the pump. He said a drain/refill/filter - followed by a couple of hours driving - followed by another drain/refill will get you somewhere north 90-95% fluid replacement (as confirmed with actual engineering studies at Allison). Again YMMV but I suspect this is more or less true for many other trannys. |
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Thanks for the info. Not performing poorly, just wanted to know if the slight "jump" after giving it gas was normal. Ahh yes, I remember those early stages leading up to a transmission rebuild on my Silverado. $1200 later, it runs great. Change your filter, don't just flush. |
| I do a flush every 12,000 miles and a new filter every 24,000 miles. But if you have done neither for 85,000 miles I wouldnt do anything that many miles on the same fluid you run the risk of the new fluid blowing seals. id personally do nothing let the transmission run its coarse at around 100K it will probably need rebuilt then start fresh and start taking care of your transmission. |
| In my opinion, if you haven't done a flush yet at 86k, DON'T. It's not a bad idea if you do it in regular intervals from the time it's new, especially in cars that are know for transmission problems. However, once you have been driving it for several years, and especially if you think you are noticing irregular shifts, flushing it could very likely do more harm than good. At this point I would recommend dropping the pan and changing the filter and top off the fluid and call it good. |
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In my opinion, if you haven't done a flush yet at 86k, DON'T. It's not a bad idea if you do it in regular intervals from the time it's new, especially in cars that are know for transmission problems. However, once you have been driving it for several years, and especially if you think you are noticing irregular shifts, flushing it could very likely do more harm than good. At this point I would recommend dropping the pan and changing the filter and top off the fluid and call it good. Probably your best advice. You really need to change the fluid every 30k miles out here. The heat breaks down the fluid. |
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Quoted:
Quoted:
In my opinion, if you haven't done a flush yet at 86k, DON'T. It's not a bad idea if you do it in regular intervals from the time it's new, especially in cars that are know for transmission problems. However, once you have been driving it for several years, and especially if you think you are noticing irregular shifts, flushing it could very likely do more harm than good. At this point I would recommend dropping the pan and changing the filter and top off the fluid and call it good. Probably your best advice. You really need to change the fluid every 30k miles out here. The heat breaks down the fluid. Will do, thanks for the advice. |
| Yes that is true ,but how many times do they suck too hard and cause the front seal to leak ? And they almost never change the filter . If you dont change the filter and clean to crap out of the bottom of the pan it's like takeing a shower and putting on the same dirty underwear . |