Results 1 to 10 of 23
04-07-2012, 03:21 PM #1
Thoughts on flushing rather than pan drop...
I've heard people do not like flushing the transmission thru the transmission lines on the radiator. Why? Any input? I have had mine done in between pan drops, which is about 20K between flushing and a pan drop. My truck has now 115,000 mi. So what are any problems anyone has had with the flushing?
04-07-2012, 04:02 PM #2
Flushing is bad for a transmission. It's much, much, much better for a transmission if you drop the pan and change the filter while you're at it. It's not so bad on a newer tranny but my rule of thumb is if it has more than 50-60k miles, you're just trying to kill the transmission by flushing it. There's too many things that can break loose when you flush it that way. I'm a little more conservative than most but I did get 250k miles out of the original transmission so I obviously did something right.93 Suburban (Southern Slayer): TBI 350, 4L60E
73 Z28 Camaro: L82, TKO 600
"...Death smiles at us all, all a man can do is smile back..."
04-07-2012, 08:12 PM #3
ive read horror stories on the internet from people flushing. all the crap/gunk/shavings get jammed in places they are not meant to be. a flush cost more than dropping the pan cleaning it out, new filter and gasket. plus you personally will know the health of your trans. when you find whats inside it. aka cluth lining, metal, mine i did for around 45 bucks with a really good quality filter. do what you want but consider yourself warned.
04-07-2012, 11:47 PM #4
Had a friend of mine get his flushed and it blew a seal...then he had to have it rebuilt a few months later. He said that it was the worst choice he's ever made. x3 on doing just a pan drop and filter swap. Never can go wrong by doing it yerself. If you're worried about the integrity or cleanliness of the fluid, just swap it again a little bit later.
2008 Ext. Cab Silverado LT1 5.3L 2WD
APC LED Tail Lights | Spec D Smoked Third LED Brake Light | aFe Magnum Force Stage 2 CAI
04-08-2012, 12:18 AM #5
I had a flush done on my work truck a couple years ago (07 F250 5.4 gas) per my boss's instruction rather than dropping the pan, a week later driving down the interstate it felt as if the truck slammed out of gear, the cruise then revved the motor up, it slammed back into gear and the transmission blew its guts out all over I20..
Drop the pan. LOL
"If you're not living life on the edge, You're taking up too much space"
"Truck Norris"- 2008 TX Edition Silverado
- McGaughy's 4/5 Drop Kit
- Apline Type R 10s & Amp
- Pioneer 6 Disc Touchscreen Deck
- Nightmare Breed Motorsports custom tune
- Custom 3" dual exhaust through x-pipe dumped at axle
- Airaid CAI
- Badges and molding removed, roll pan, Truxedo roll-up cover (compliments of GMTC!), 3pc billet grille, factory fogs upgrade
"Kristine" - 1991 Nissan 240sx
- Cut to pieces, LS build pending
04-09-2012, 12:08 AM #6
Drop the pan and get disconnect the cooler lines, go get yourself a bottle of the flush, and flush the cooler heavily IF you're even going to flush it at all.
www.youtube.com/ippielb 2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax 6.5" BDS Suspension Lift Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case EFI Live Comp Cam and Valvetrain Snow Performance Methanol Injection 35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires EFI Live & AFE Stage 2 Intake Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder 33x13.5 Hankook rt03 18" XD Rims Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light BDS Dual Steering Stabilizers Pioneer Double-DIN Touchscreen Navigation with Two 10" Subs under rear seat Electric Fan Autometer Pressure, Boost, and Pyro Gauges 4.56 Gears Airlift Air Bag Suspension
04-09-2012, 07:45 PM #7
Thanks for all the feedback! Keep it coming! Here is one for all to ponder. It would be great to hear a GM mechanic's thoughts on this one.
My mechanic at my work (diesel mechanic) has a 2009 or 2010 1500 and he is getting it ready for his trip to OBX, in a few weeks. Anyway he took it to our local GM dealer for his 50,000 mi service. He asked about servicing his transmission (pan drop with filter) and the lead tech suggested just a flush because the filter on his transmission (4L60E) is just a screen. In other words it has no type of element at all. So he had the flush done. That being said I would love to hear other GM tech's thoughts or even GM's protocal on servicing transmissions.
Another question about seals blowing. Here is my experience Saturday at a local 10 minute oil change chain. I asked one of the techs at the chain as he was flushing my transmission, his thoughts of flushing. He responded he had a bad experience with it due to a seal blowing. I asked what seal, he said he didn't know. But he took it back, the tab was $300, which they supposedly covered. But here is the kicker. The machine (T-Tech) they use uses the transmission pump to pump out the old and pump in the new. That being said how is it possible to have a spike in pressure when in park at idle while the fluid is transferring. Oh asked another tech there and he said he has done his truck a few times with no problems.
Lets hear more opinions or experiences please!!!
Last edited by dedmon27; 04-09-2012 at 07:50 PM.
04-09-2012, 08:46 PM #8
I have never gotten a satisfactory answer about what exactly they were flushing it with and how is the last transmision they flushed with the machine not somehow contaminating mine. I don't see ten different machines for ten different fluids. I think you are asking for trouble if you do.2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear
04-10-2012, 12:17 AM #9
ippielb has a good idea in that IF you're going to flush something, flush the cooler and its lines while it's disconnected from the system. Personally, though, I'd stick to pan+filter and actually had a discussion with a mechanic of 32 years about this very thing, today -- he said the same.
04-10-2012, 06:41 PM #10
I flushed both of my trucks and my wifes windstar. Never had a problem with any of them
By parts bot in forum Chevy Parts eBayReplies: 0Last: 11-22-2011, 10:20 AM
By 9191gmc in forum Chevy Silverado Forum (GMC Sierra)Replies: 15Last: 09-09-2011, 10:41 PM
By Thundare in forum General Chevy & GM Tech QuestionsReplies: 6Last: 11-24-2010, 10:19 PM
By LAF in forum General Chevy & GM Tech QuestionsReplies: 3Last: 03-08-2010, 12:56 AM
By Matt_TX in forum Chevy Silverado Forum (GMC Sierra)Replies: 10Last: 03-05-2010, 09:48 AM