Tranny service Question

[Bulldogger]

Just did my tranny, changed both filters and flushed torque converter. Question is my tranny pan isn't leaking but I find a slight film of tranny fluid on the rear part of the gasket where its sandwiched by the pan. Tranny pan came off gasket looked perfect all I did was wipe it off and replace pan. Bolts were torqued to 20ft/lbs in a star pattern. Truck been driven for two days no fluid ever drips down pan just has a hint of fluid when wiped with paper towel. Thanks Dave

[Joe.G]

Hint:Put a light film of grease on the gasket with your finger, helps it come off next time and stops the seeping.

[gene smith]

bulldogger--im getting ready to change out my fluid to transydn and want to make sure i get all the old fluid out, did you take the cooler line off, if so please give me a rundown of how you do this and which line do you take off, thanks in advance

[Bulldogger]

Gene,

On the passenger side of the tranny, near the front by the torque converter, there are two silver colored lines going into the tranny. The top line states "from cooler" (words are stamped in the metal on the tranny housing by the lines). Slide the plastic cap back. Then look closely and you will see a metal c style clip. Slide that off with a scew driver. Pull the tranny line out from the tranny, some fluid leaks out so have a 5/8" rubber hose to place over the cooler line. Next, add four extra quarts of tranny fluid to the tranny. Take the empty gallon tranny bottle, put the 5/8" rubber hose in it, and start truck. Run the truck for about 15-20 seconds. When that bottle is full, shut off the truck. Add another four quarts and repeat this again. This will flush out the tranny cooler and torque converter. You will need somebody to start and shut the truck while you do the above flush. After, push the tranny line back in all the way and replace the c clip. C clip has to be on the outside of the flared or ribbed part of the tranny line. Then run the truck, put the tranny in foward and reverse a few times, and check the fluid level. Keep in mind there are cold and hot markings on the tranny dip stick. smile.gif

[56Nomad]

Here is the "Reader Digest" summary of what hoot and others have posted
previously.

When my brother in law's and my truck were approaching 25,000 miles
we flushed both together. It really was not all that difficult, however
I will say it was a bit messy, even with two of us working together. Plan on
using lots of newspaper..... better yet, big pieces of cardboard under your
working area. Have lots of clean rags handy too. Also, we used 2.5 gallon
plastic jugs to measure out the amount of ATF removed. We stayed with
the stock pans and here is our summary. (Almost all of this information
is from Hoot's summary and previous postings) Keep in mind that both
my brother in law and myself are just basic amateur mechanics...... that
means anyone should be able to do it.

+Drained pan - about 7-8 qts came out.

+Reinstalled pan plug and removed pan - 12 bolts, very easy to loosen & remove.

+Gasket was in great shape and slid off pan upon removal.

+Removed black plastic, pressed in, screen holder - more ATF came out from
the resultant opening. Wiped it with clean rag.

+Cleaned pan - Wiping bottom of pan with clean rag and came up black with
what was assumed to be particulate metals, etc. Cleaned the pan magnet.
Very glad I did this!

+Removed filter - Magnet was firmly attached to filter and would be
difficult to note if you weren't looking for it

+Cleaned magnet - used clean rag and took some time to "pull" any material
off of it as it wants to stay and is so small, it is hard to note. Comes off
as black film on paper towel, very tiny particles.

+Installed magnet on new filter and installed filter - filled filter with new fluid,
assuming this would help "prime" and was easy to do.

+Positioned gasket and reinstalled pan - We used the original gasket
The tranny pan gasket IS REUSABLE and should survive many on/off cycles

+Tightened bolts in star pattern. Each torqued (20 ft/lb.) Tightened pan plug (25 ft lb.)

+Refilled Pan - from dipstick opening, using funnel, used 9-10 quarts....

+There are two lines on the passenger's side of the transmission up front
near the converter; the lower one is the "To Cooler" line and the upper one
is the "From Cooler" line. Disconnect the "From Cooler" Line - much easier than
expected. Slide plastic cap back, carefully remove the snap ring. Pull the line
out of the fitting.. don't remove the fitting from the tranny - just slide
the plastic cover back. More ATF came out of hole and cooler line. Draining is
from "From Cooler" line, now hooked up to a 2 ft clear tubing into a EMPTY plastic jug.
Start engine which causes fluid to drain. Plastic jug is filled in about 30 seconds
(about 6 quarts). Some of the new ATF will be sacrificed..... but you will know that
your system is flushed. This procedure required the two of us. One person to (START)
the engine (keep in NEUTRAL) and the other person under the truck to scream (STOP)
when the plastic jug was filled to 6 quarts of flushed out ATF.

+Reinstalled "From Cooler" line - used same clip, hard to believe that little clip
keeps line sealed! Don't forget to push line as far as it will go before clipping.

+Filled transmission - with another 6 quarts of ATF, drove truck in each gear,
checked Hot, may need to add more so check later...

+All said - about 1.5 hours for each truck and we each used just a tad over
4 gallons of Transynd per truck. The 5 gallon pail of Transynd is Allison
p/n 27101-CTPL) $136.50 in our area.