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Adding an Auxilary Auto. Trans. Filter
by cclngthr
With a non-servicable screen as a filter in the automatic transmission,
I asked about having a additional filter to keep the crud from eating up the clutch packs. The cleaner the fluid is, the better.
This DIY adds a external filter on the return line of the transmission cooler line.
THIS FILTER MUST BE REMOVED BEFORE THE TRANSMISSION IS SERVICED WITH
THE FLUSH MACHINE AND REPLACED AFTER THE FLUSH AT EACH AND EVERY 30,000 MILE SERVICE.
Since I have a aux tranny
cooler (see my other DIY on this), this may differ than those without it, but I will add instructions to those without the
additional cooler.
Materials
1 Tranny line filter (can
be found at most transmission shops for under $20.00) This filter is designed for transmissions only. No other filter
can be used.
2 Hose clamps
Nut drivers or screw drivers
Extra fluid (SP-III) (filter holds about 4 ounces)
Extra
length of hose (optional)
The Project
1. On the transmission line closest to the drivers side of the car (return line), cut the hose in a location that the
filter can be easily located in. On my car, since I have the aux cooler, I could do this without crawling under the car. Those
without the cooler may have to remove the hose entirely to cut it properly.
 2. The filter is directional and will need to go in a specific way so the fluid flows in the same direction as the
arrow on the filter. Hook up the filter to the lines in the correct direction. Tighten clamps tight. 3. Start car,
check for leaks, and run car until the fluid is at normal operating temperature. Add fluid as necessary, making sure the level
is at the top hot line. Drive several miles and recheck connections and fluid level. The filter will become hot as the fluid
flows through it, which it is normal to do this. 4. When it is time for the 30K service, the tech must remove this
filter and hook his machine to the 2 lines that are now open. After the flush, a new replacement filter is installed.
- Colin
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