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Old 03-14-2018, 09:20 PM   #1
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To flush tranny or not to flush tranny.

I have a little over 100000 miles on my 2013 Silverado. I'm debating on if I should have the transmission flushed or drop pan and replace filter and fluid or just leave it alone. Thanks in advance.
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Old 03-14-2018, 09:26 PM   #2
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Have you done any other maintenance on it? Have you overheated it? Hows the fluid look?

If the fluid looks red and doesn't smell burnt, I'd go ahead and replace it.

If it looks or smells burnt, I'd be concerned you might be pushing it to an even earlier grave by changing the fluid. Often, if you have a lot of clutch material suspended in the fluid, it helps with the clutches continuing to work. Once you flush that out, you're SOL.
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Old 03-14-2018, 09:29 PM   #3
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Most problems with transmission happen after you drop the pan and replace the filter.
Its good to do but just remember, 1gr of sand/dirt can make your valves stick in the valve body.
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Old 03-14-2018, 09:51 PM   #4
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Have you done any other maintenance on it? Have you overheated it? Hows the fluid look?

If the fluid looks red and doesn't smell burnt, I'd go ahead and replace it.

If it looks or smells burnt, I'd be concerned you might be pushing it to an even earlier grave by changing the fluid. Often, if you have a lot of clutch material suspended in the fluid, it helps with the clutches continuing to work. Once you flush that out, you're SOL.
I will check the fluid tomorrow and see what it looks like. Last year while towing I had it get to about 210 degrees and I when I got home you could smell it was hot. I am going to be replacing the OEM trns cooler with a B&M or Hayden transmission cooler.
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Old 03-14-2018, 10:00 PM   #5
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I build GM trans and did so for a dealer for years. If it dies because you serviced it, it was almost done anyway. I haven't done anything with the new 6 or 8 speeds but transmissions are transmissions. In my 07 I flushed it at 50k. At 100k, dropped the pan and changed the filter. Then I flushed it. You get all the fluid swapped with a flush. I don't use any of the cleaning or conditioning additives. I like dex VI, or valvoline max life.
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Old 03-14-2018, 10:31 PM   #6
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Heat kills. Drop the pan. Change the second gear servo to a corvette servo. The 4th gear to a Sonnex billet servo. Trans go shift kit. It's about time for a rebuild. 4l60e is good for around 130k-150k ish. Put a precision torque convertor in it too. If you tow, it's insurance. Better look at the rear axle too. Carrier bearing and axle bearings. fill it with good synthetic like BG and Turbomaxx.
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Old 03-15-2018, 06:44 AM   #7
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To flush tranny or not to flush tranny.

I just traded in my 2000 F350 7.3 with 342,000 and original transmission. I flushed my tranny by disconnecting the rear tranny line and attaching a clear hose and put other end into a 5 gallon can.


I would drain my pan and fill with fluid. Turn on truck and shift thru gears until I saw bubbles in clear line then turn-off truck, fill pan with 7 more quarts and start process over two times. Cap off with another quart or two.

I had an maganafine external filter, which I replaced every 25k, so would only drop my pan and replace tranny filter every 75k.
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Old 03-15-2018, 08:22 AM   #8
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I just traded in my 2000 F350 7.3 with 342,000 and original transmission. I flushed my tranny by disconnecting the rear tranny line and attaching a clear hose and put other end into a 5 gallon can.


I would drain my pan and fill with fluid. Turn on truck and shift thru gears until I saw bubbles in clear line then turn-off truck, fill pan with 7 more quarts and start process over two times. Cap off with another quart or two.

I had an maganafine external filter, which I replaced every 25k, so would only drop my pan and replace tranny filter every 75k.

That's rare. 342K on a 4r100. Did you tow with it? My 01 Excursion 7.3 has 253K on it and the 4r100 has been rebuilt twice. Once when it was my uncle owned it at around 55K because of the known issue with the bad sprag installed in 01 from ford, and when I bought it from him I had the trans built at 235K with new everything extra clutch pack and billet converter and trans go shift kit. I expect it to last another 200k. Had the same issue on my 01 Ford lightning at 56k lost 2nd and 3rd gear. The 4r100 can be redeemed with the right parts.
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Old 03-15-2018, 08:35 AM   #9
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This is like asking "what's the best beer" or "what's your favorite sports team".

Lots of opinions.

My opinion is DO NOT HAVE IT FLUSHED unless you first pull the pan and clean it and change the filter.
If it doesn't smell burnt just drive it.
If you stir up that stuff in the bottom of the pan you will clog something and be out of luck.
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Old 03-15-2018, 08:38 AM   #10
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Originally Posted by Locky View Post
I will check the fluid tomorrow and see what it looks like. Last year while towing I had it get to about 210 degrees and I when I got home you could smell it was hot. I am going to be replacing the OEM trns cooler with a B&M or Hayden transmission cooler.
210 is not good. My trans rarely hits 180 towing a 7500lb trailer uphill with a headwind in my excursion. Like I said in my previous post, rebuild it and put a derale trans pan on it too. My trans temp dropped 15 degrees at least with this pan. I've got a probe in my pan and the fluid is 20 or so degrees cooler than the fluid temp at the valve body the computer reads.
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Old 03-15-2018, 08:51 AM   #11
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This is like asking "what's the best beer" or "what's your favorite sports team".

Lots of opinions.

My opinion is DO NOT HAVE IT FLUSHED unless you first pull the pan and clean it and change the filter.
If it doesn't smell burnt just drive it.
If you stir up that stuff in the bottom of the pan you will clog something and be out of luck.
Dan, he already said it smelled "hot". That's burnt. Toast. Done. The 4l60e is known to fail if pushed. Spend the money and rebuild it before it leaves you stranded.
You're past the flushing stage on a 2013 with 100k.
My 04 suburban only has 155k on it and I've already had the trans rebuilt in it too.
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Old 03-15-2018, 10:24 AM   #12
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I changed the transmission fluid at 70,000 miles on my Silverado 3500 and again at 110,000 miles. Changed all the fluids in rear end too.
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Old 03-15-2018, 10:35 AM   #13
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I flush my transmission every 30K miles with this procedure.

1) Drop the pan and change filter and clean pan. Reinstall pan and fill with fluid.
2) Remove return line and run a hose to a container marked for 2 qts.
3) Run engine until you remove 2 qts. Turn off engine and refill with 2 qts.
4) Continue previous step until fluid changes color.

This is not a power flush so should not dislodge any particles.

Do not use the method where you run until you see bubbles. You don't want the pump seeing air if you can help it. No need to do that if you do 2 qts at a time.

There is a fitting you can buy that can fits in the return path of the fluid which on my truck is the top outlet of the radiator. You can attach a clear hose to this. Clear is best since it allows you to see the color change.
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
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Old 03-15-2018, 11:31 AM   #14
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I see the scare crowd is out again. How long was it at 210? 'Smelling hot' was pretty vague - did he mean the truck in general, or the oil itself? Smelling hot fluid isn't necessarily the same as smelling burnt fluid. Even our truck 'smells hot' after a good pull up the Rockies in 32C weather without any of the fluid temps on the gauges moving from normal. If the OP comes back saying the fluid looks ok, I would just drop the pan. Doesn't hurt to have it flushed if that's what he wants. I wouldn't bother flushing if it's significantly darker than normal or smelling burnt.
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Old 03-15-2018, 11:35 AM   #15
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Quote:
Originally Posted by Locky View Post
I am going to be replacing the OEM trns cooler with a B&M or Hayden transmission cooler.
I would highly recommend a different cooler. The True Cool 40k is an awesome cooler.

Read this thread for installs on chevys.

https://www.performancetrucks.net/fo...thread-470284/

https://www.dropbox.com/s/05hjqkq8om...45646.jpg?dl=0
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Old 03-15-2018, 11:49 AM   #16
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Originally Posted by bigmurph View Post
I build GM trans and did so for a dealer for years. If it dies because you serviced it, it was almost done anyway. I haven't done anything with the new 6 or 8 speeds but transmissions are transmissions. In my 07 I flushed it at 50k. At 100k, dropped the pan and changed the filter. Then I flushed it. You get all the fluid swapped with a flush. I don't use any of the cleaning or conditioning additives. I like dex VI, or valvoline max life.
I completely agree on a Master Tech myself and I would definitely flush my transmission. It definitely wouldn't hurt to do a filter change at the same time
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Old 03-15-2018, 12:28 PM   #17
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When I sold Chevy we told our customers trans fluid was good for 100k I looked at my maintenance schedule it states(ford) 150k before change. Also I know my eco boost the trans had thermostat to keep it hot something about being more efficient that way best bet take it to expert
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Old 03-15-2018, 12:44 PM   #18
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Originally Posted by Locky View Post
I have a little over 100000 miles on my 2013 Silverado. I'm debating on if I should have the transmission flushed or drop pan and replace filter and fluid or just leave it alone. Thanks in advance.
Do you have a 1500 Silverado or a 2500/3500 Silverado with the Duramax? I'm assuming just the 1500. If so then I would have it serviced and flushed. If the Duramax with the Allison transmission, DO NOT have it flushed out. Allison does not recommend it and it can fry the transmission.

210 on modern synthetic fluid is no big deal at all. On the HD trucks with the Allison the transmission hot warning doesn't even come on until 275. Mine runs 200-220 just going down the highway pulling my FW. Synthetic fluids like DexIV or Transynd is much better at handling heat than the old fluids.
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Old 03-15-2018, 02:24 PM   #19
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I see the scare crowd is out again. How long was it at 210? 'Smelling hot' was pretty vague - did he mean the truck in general, or the oil itself? Smelling hot fluid isn't necessarily the same as smelling burnt fluid. Even our truck 'smells hot' after a good pull up the Rockies in 32C weather without any of the fluid temps on the gauges moving from normal. If the OP comes back saying the fluid looks ok, I would just drop the pan. Doesn't hurt to have it flushed if that's what he wants. I wouldn't bother flushing if it's significantly darker than normal or smelling burnt.
People with common sense put on "OFF" before going outside knowing mosquitoes are out, some people don't. You must be one of those that like getting bit. I prefer to be proactive in my approach to things that bite.
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Old 03-15-2018, 02:55 PM   #20
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I agree with rmoore0852, 210 is not hot. My 2013 f150 tranny ran 195 on any given day, just back and forth to work. When we pulled our 5r, it would stay around 210-220. Never had burnt smell.
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