New Modified Transmission Flush Method with Pictures

[TRuck]

andybrown, yes. mine did.
so to update did second drain and fill....so far so good. blinking arrow has not returned yet. shifting smoothly (knock on wood). will be doing 3rd drain and fill this weekend. i agree with jb06924...this thread in particular is incredibly helpful/effective. massive results! thanks

[dcarlson12]

Just double checking that the same crush washer which is used for the engine oil drain plug will work for the transmission? In particular 94 thru 97 Model 850?

[SimLyons]

Yes. Same washer.

[da7]

i've done this last month on my 1997 S70, removed the hose from the oil cooler, slipped on the pvc hose to the removed hose, started the car, expecting oil to be flushed from my clear pvc hose, waited for like 10 seconds.... nothing..... which is then I've noticed the transmission fluid ALL OVER THE PLACE.... F#$!#%# $H!@!! turns out for some reason my ATF comes out the oil cooler end....no idea why, but it's too late, I have no hose that will fit inside the oil cooler, so ended up putting the drain pan under the radiator, flushed the fluid 4-5 times, and do the big clean up afterwards, under the car, wind deflector, all the pipes and hoses everywhere near the radiators, and on my driveway.....

[dcarlson12]

When doing the flush with this method (draining from inlet hose to cooler), does the fluid inside the cooler get sucked into the transmission? i.e. does the oil in cooler get removed?
I see that one style of flushing machine connects the line from the transmission to the machine to pump the old/dirty oil into the machine which pushes a diaphragm which in turn pushes new oil into the transmission cooler and the new oil then passes thru/flushes the cooler on the way to going back to the transmission.
In doing the method without a machine, as described in this post, would one put the new/clean oil into the cooler inlet rather than into the dipstick pipe? I know one would maybe have to make a special fitting or use a large piece of hose to connect to the cooler inlet but that doesn't sound too difficult...

[dme123]

Is there any reason that rather than removing the drain plug to get the first load of oil out you couldn't use an oil extractor to remove it via the dipstick? I only ask because I have no access to ramps or anywhere sensible to work under the car.

[jblackburn]

Go drive around and shift through all the gears a few times first. Get it nice and hot, then just pump the fluid out through the cooler hose.

The drain plug method is supposed to be to release all the crud that settles at the bottom, but you can probably knock most of it into suspension again by doing this. In any respect, new fluid is better for it than what's probably in there.

[SimLyons]

You can (I did) drain it direct from the oil cooler (upper trans connection) outlet...NOT the hose. Just attach a clear 1" hose over the outlet fitting (Lowes or Home Depot, by the foot, also any auto parts store). You'll need several wraps of teflon tape to prevent leaks. Or a hose clamp. Worked great for me. Same method...2 qts out, 2 in, 2 out until at least 12 qts. My fluid was sludge when I first drained it. Black with a slight hint of brown. It's been 3-4 weeks now and I have to go into surgery tomorrow and won't be working on any cars for at least 8 weeks, so in late October I'll do the third and final flush/fill. Then every 2 years or 30K.

[shiloh51933]

I just drained and filled my '96 850GLT with Mobil 1 Synthetic ATF and half quart of Lucas Tranny Treatment. The fluid was pretty dark for trans fluid. I ran some semi synthetic ATF threw the system just to clean it out before putting the drain plug back to fill. I felt a little better response immediately but I never had any issues to begin with. I feel better knowing the A/T has top shelf fluid in her. Now I need to either adjust the tensioner or replace it.

[elchopperfreak]

Excellent!!