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BTW, is the flush done with respect to normal fluid flow of the trans? I would not want to have fluid flowing backwards as valves etc were not engineered for that use.
Norm,
Yes, flushing at the return port scavanges the old fluid that would normally go back to the tranny. The flow direction is normal.
I much prefer this method over repeated dilutions of old fluid with new (or visa versa) over time.
As for the so-called "filter", it's just a screen that never caught anything that I could see, back when I used to drop the pan. I don't do that anymore, as I agree with this Volvo TSB:
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posted by Gregg Shadduck on Thu Feb 10 08:06 EST 2005
From the clumsy but economical "Popular Science" [who?!] CD collection of TSBs (technical service bulletins) from Volvo:
TSB 17106
Dec 1990
"ATF filter cleaning deleted"
for 200/700/900
for all those AW 70/70l/71/72L transmissions
and for ZFHP22
(Does NOT apply to BW*)
"It is NO LONGER REQUIRED [capitalized in original] to clean and inspect the Automatic Transmission Filter..." [The tiny filter screen, which you get at, of course, only with SUBSTANTIAL effort.]
Advised to still replace the ATF fluid at specified intervals, and to flush the transmission cooling system.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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