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Ford 9N, 2N & 8N Discussion Forum
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OT. Automatic trans. oil

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RoNofohio

07-18-2005 07:44:42




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Changing the tranny oil in my wife's Lexus (1992), I checked out the various brands. $2.99, $2.79, $1.99 and of course the store brand for $1.49. Since the lables on the reverse were similar, I bought the $1.49/qt from NAPA and changed the oil and filter. Now the tranny is malfunctioning (While in Michigan (500 mi. north sitting at a stop sign, I pressed the gas and it seemed to still be in overdrive..no power, or slipping badly. I put the shifter in 1st and it worked ok. Went up the street a mile, turned around and same thing. Put the shifter in 1st and shifted manually till I got back to where we were staying. Next morn, no problem at all and actually drove the 500 mi. home (praying all the way). I thinking about changing the oil again while it is working properly and going for the $2.99 stuff. Could there be a difference between pricy and cheap other than price? quality? could it actually make a difference. I called AAMCO last week, and they want to see the car and give me an estimate. Called a local shop and they told me to stay away from AAMCO as most of their business comes from distressed former AAMCO customers..sorry this is so long but I know there are some on the board who really understand oils...thanks....Ron

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CATFIXER

07-18-2005 17:23:05




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 Re: OT. Automatic trans. oil in reply to RoNofohio, 07-18-2005 07:44:42  
I worked at AAMCO years ago and depending on who would do the work would depend on the quality of service you would get out of the trans.Stay away from the places that claim to backflush your system espicially ones that dont remove the pan and change the filter CIRCULATING GLITTER FROM THE BOTTOM OF YOUR PAN IS NOT WHAT YOU WANT TO DO!! I would drain that el cheapo stuff out and change the filter and put in what the manufacturer recomends.And FWIW I change my trans oil and filter every 15000 miles but if your oil has gone over 30000 and its still pretty and pink DONT CHANGE IT unless your having problems if it turns black or brown and you see glitter on the stick and it smells burned change it immediately you may be in for a rebuild soon.As for rebuilds try to buy a remanufactured unit from your dealer if possible if they will honor a warranty if someone else installs it you may come out cheaper that route.A transmission rebuild area should be as clean as a operating room HTH

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don t.-9n180179

07-18-2005 11:49:54




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 Re: OT. Automatic trans. oil in reply to RoNofohio, 07-18-2005 07:44:42  
Long time ago, took my 65 chevy to AAMCO, tranny wasn't shifting properly. They dropped the pan and inspected. The mechanic says heres your problem, you've got all these shavings in the bottom of the pan. It'll cost mucho bucks that I didn't have. A neighbor who was starting out in mechanics says take it to a place he knew. I did and it was an external valve that was bad. Something like $20. Aint been to AAMCO since.
YMMV....FWIW.....don t. .....

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souNdguy

07-18-2005 11:04:53




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 Re: OT. Automatic trans. oil in reply to RoNofohio, 07-18-2005 07:44:42  
Some vehicles ( dodge ) require a special atf oil.. or you can use regular atf, and then add a special atf modifier to it. I understand onthe dodge that it can cause chattering.. weird transition from TC lockup, etc..

What's your manual spec for oil?

Soundguy



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RoNofohio

07-18-2005 12:01:53




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 Re: OT. Automatic trans. oil in reply to souNdguy, 07-18-2005 11:04:53  
Manual calles for Dexron II which of course has been replaced by DexronIII/Mercon and all manufaturers state that their oil replaces DexronII...Ron



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Rob

07-18-2005 08:30:38




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 Re: OT. Automatic trans. oil in reply to RoNofohio, 07-18-2005 07:44:42  
Seems if the oil wasn"t right it never would work. If you didn"t drain the torque converter and any control lines then you only changed some of the oil anyway. Did you fill it warm it and shift into each position, hold some, and then check the fluid level again?
I would double-check the fluid level after I warmed it up good. If you didn"t shift through all the ranges it might have just been internally refilling and causing you consternation. If it"s now low on fluid it wasn"t properly filled and topping it off should cure what ails you.

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RoNofohio

07-18-2005 08:52:17




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 Re: OT. Automatic trans. oil in reply to Rob, 07-18-2005 08:30:38  
Didn't drain the tork converter or lines. But I did go through the shifting pattern and after tranny warmed up (20 min or so), continued to add oil until it was on the crosshatch. And then drove 500 mi. with no problems. The book called for 3.3 qts, and I added nearly 4 qts. But it isn't overfull according to the dip-stick. Tranny quy told me that some of the converter oil probably drained and it was refilling. Don't know how much tranny holds (including converter), but I ordered a manual and won't drive until the manual arrives. Since there is only about $5 total difference between the low priced and the best, I think I will change it again and go with the best they have. But here again, I will be mixing the best available with the store brand. I just hope there is no permanent damage.Thanks for the respond..Ron

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Stan(PA)

07-18-2005 09:21:43




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 Re: OT. Automatic trans. oil in reply to RoNofohio, 07-18-2005 08:52:17  
Take it to one of the shops with the "total change" type machine. It uses the lines to circulate out the old and replace with new. Costs around $80, I think. It made a BIG difference in smooth shifting ect. on the vehicles I"ve had done.



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Mike S

07-18-2005 16:09:16




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 Re: OT. Automatic trans. oil in reply to Stan(PA), 07-18-2005 09:21:43  
I am very leary of those reverse flow oil changes for an automatic. I had it done twice and within 3 months both of those transmission died. I always just drain the pan and change the filter and drain the converter if it has a drain plug, otherwise not. I usually use the brand that the book specifies. Motorcraft or GM and so far, no problems on the other vehicles. Could have just been a fluke, but both vehicles had less than 90 k miles when I did it. I got one truck now that has the original oil in it and it has over 150k. And I am skeptical of even changing it since it is still pink and has no odor.

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gahorN

07-18-2005 17:31:01




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 Re: OT. Automatic trans. oil in reply to Mike S, 07-18-2005 16:09:16  
What you didn't tell us was how many miles the car had on it total...and since the last trans-fluid change.
Short answer: Either change your tranny fluid regularly...like once a year/once every 20K miles...or don't ever change it....EVER!
Why: Auto transmissions which never get fluid changes develop "coke" ( a type of sludge/carbon ) which is nothing more than burned trans-fluid which takes up the clearance between the shift-pistons and the cylinder and keeps pressures relatively where they need to be to make the tranny shift correctly even tho' the rubber O-ring piston seals have become hard and non-pliable. The tranny works just fine until some well-meaning person has the fluid changed....which introduces new fluid with detergents into the system which clean out the old coke and now the tranny has excess clearance and will not shift into/out of gear properly. A tranny which gets regular changes benefits from fresh fluids which have additives to keep the rubber o-ring piston seals pliable so they can conform to the shift cylinder walls and shift properly. Either way, (I personally change my fluids every year, and now my Jeep has 252K miles on it's original tranny), you should use the correct, specified fluid. Most autos these days use DexronIII/Mercon fluids. If your earlier car specified DexronI or Dexron II...it's OK to use the later III. (And Mercon is simply Ford Motor Company's brand name for the same item.)

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Rob

07-18-2005 17:37:34




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 Re: OT. Automatic trans. oil in reply to gahorN, 07-18-2005 17:31:01  
I got 259k on a Ford AOD on the original fluid. Manual says don"t change the fluid. So I don"t.



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