Transmission fluid change
#1
Transmission fluid change
1996 850 Turbo Wagen with 64000 miles and origional transmission fluid. Fluid is brown and smells a little burnt. Trans shifts a little hard sometimes. Should I do a drain snd fill per the Haynes manual, or a more gradual drain and fill over 3 or 4 times that some recommend? What fluid would you use?
#3
#6
google around on option b, which is to disconnect the transmission cooler lines. (this is the shop method btw) At one point FCP actually sold a kit with hoses and buckets but the idea is to use the transmission (engine running) to pump the fluid through a clear hose into a bucket while it fills from a bucket with clean fluid. when the output is translucent you are done. Similarly the S40 service manual suggests a process where you disconnect the cooler line and pump out 2 quarts, stop the engine, refill from the top, restart (rinse/repeat until good).
#7
method revision (suggestion)
The efficiency of letting the transmission pump out its own dirty fluid is obvious. The trouble with drawing in fluid through a bucket of new fluid is one of control.
I think it's better to pump out 2 quarts at a time, stopping the engine, refilling 2 quarts of new fluid and redoing the process.
I think it's better to pump out 2 quarts at a time, stopping the engine, refilling 2 quarts of new fluid and redoing the process.
#8
So I am using one of the popular methods promoted by Robert the utube 850 guy. I drained the xmission as much as would come out = 3 qts. Then added 3 quarts and drove around 100 miles. Repeated the process and will do at least 3 times total. After a few hundred miles I will probably do the complete flush. Shifts very smoothly now!
#9
I'm with MT6127. I used some left over clear (green tint) hose from a water softener that fit my trans hose nice and tight. Ran it over the drvs fender into a jug.
I have 300K and my fluid was nasty. I started the car and let it idle and pump fluid out into a graduated 5qt oil container while I shifted through each gear and watched the hose. When I started to see bubbles I'd shut off the engine, read the measure of the fluid pumped out and drain it into another container, add that amount of fluid or a bit more and than do it again. I did it four times so I knew I had the best flush I could do and the trans has held up just fine for a few years now.
Last addition I was more careful about not overfilling. I took it out for a drive each time and shifted through the gears a couple times manually to get it to the full mark. It's really hard to get it right at full.
I have 300K and my fluid was nasty. I started the car and let it idle and pump fluid out into a graduated 5qt oil container while I shifted through each gear and watched the hose. When I started to see bubbles I'd shut off the engine, read the measure of the fluid pumped out and drain it into another container, add that amount of fluid or a bit more and than do it again. I did it four times so I knew I had the best flush I could do and the trans has held up just fine for a few years now.
Last addition I was more careful about not overfilling. I took it out for a drive each time and shifted through the gears a couple times manually to get it to the full mark. It's really hard to get it right at full.
#10
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Join Date: Jun 2012
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I found that when ever I disconnected the trans cooler lines I had to replace the seals. I would not try to reuse the seals and that goes for the locking clips that hold the hoses to the cooler. I had one blow off while driving, not good for the tranny - see my post on installing a new transmission.
#12
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