Transmission Fluid change - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-02-2007, 04:36 AM   #1
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Default Transmission Fluid change

My transmission is slipping occasionally. I am pulling the pan and replacing the filter and pan gasket and 6.5 qts of fluid. I am using 1 qt of lucas transsmission fix and 5.5 qts of Autozones house brand, Coastal, tranny fluid at the reccomendation of a BC member whos name I have forgotten. He said Coastal is Da sticky stuff! I am using an off brand filter kit, PTC, as it has a gasket where the Fram kit has none. Fram says the old one is designed to be reused. I prefer a new gasket. I was told there is no transmission additive to flush the tranny unless you pressure flush, at a pro shop. Any body know of a tranny fluid flush? One thing has always gotten me about fluid flushes: If the motor/tranny is cold the fluid is all in the pan, if its hot the fluid should drain more readily. Hmm? Also how long before I rechange it to get the rest out?
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Old 12-02-2007, 04:40 AM   #2
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I forgot my biggest question, can I do this with just the front raised on 2 jackstands? Kris
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Old 12-02-2007, 07:15 AM   #3
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front 2 wheels up works well, remove the rear (lower) trans pan bolts first and crack the gasket seal and let drain. This allows you to need a smaller catch pan. I change all oil fluids warm. If your gasket is cork it is not reusable. If you want to get more fluid change, drop it once, fill (don't put in Lucas now) , run a little, drop it again and fill. I agree with the Lucas, my original 97 tranny went 298K+ using it and it was working fine when I rebuilt.
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Old 12-02-2007, 01:24 PM   #4
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Sonma zr2, you get a big thank you from me for the great advice. I didnt think about the fact fluid is gonna come out all over. %>
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Old 12-02-2007, 01:28 PM   #5
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and i wouldnt just pet all 6.5 qts of fluid in at once. it may only lose 4-5 when u drop the pan. i would put 4 max in first, then check ur level on a flat surface.
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Old 12-02-2007, 02:03 PM   #6
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I reuse the rubber original gasket. It has metal washers around the bolts to keep from deforming the pan and to conduct heat to the pan.

REmember to refill to the bottom of the dipstick. Then warm the motor and transmission up to expand the fluid. When the fluid is hot from driving, it should come to the full mark on the dipstick. Be careful not to overfill.
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Old 12-02-2007, 02:40 PM   #7
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Quote:
Originally Posted by imidazol
I reuse the rubber original gasket. It has metal washers around the bolts to keep from deforming the pan and to conduct heat to the pan.

REmember to refill to the bottom of the dipstick. Then warm the motor and transmission up to expand the fluid. When the fluid is hot from driving, it should come to the full mark on the dipstick. Be careful not to overfill.
Not to nitpick, but that'* actually incorrect. When the transmission is cold, the dipstick level is higher, when the transmission starts, the torque converter fills itself up through the pump, and lowers the level of fluid in the pan, thus lowering the level on the dipstick. You want to fill the transmission with the car running, and put about a half quart in at a time until you're close to the top, then do it a little bit at a time, checking the dipstick level. You are correct about the gasket though, the metal-lined rubber gasket is much higher quality than a cork or paper gasket.
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Old 12-02-2007, 02:46 PM   #8
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Being that he is working on a 4T60-E, He will dump the pan and pop a new filter in it...

If the Stock Gasket is there( It will be a Metal reinforced rubber ) And in good shape reuse it..

Once you have buttoned it all together again, pour in 5 Quarts, start the car and run it through the gears.... Reverse, Neutral, OD, D,2,1 and then Park... With the car idling check the fluid, you should be on the bottom half of the cross hatched area... If not add fluid..

Usually you will use 6-7 Quarts when you change the fluid.. Once the trans is hot check the fluid again... Try not to exceed the top of the cross hatch...

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Old 12-02-2007, 03:38 PM   #9
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Thanks a lot. There seems to be some confusion though. Heres my plan correct me where I am wrong: warm the trannsmission, drain the fluid, replace the filter, use existing filter seal. Clean pan and magnet. Using best available gasket (leaning toward original metal reinforced rubber gasket) replace pan. Then add 5qts fluid. Level the car. With engine @ idle run through the gears with the car stationary. add fluid slowly until level is LOW cross hatch point. Drive car a bit and top off fluid To mid cross hatch point while at idle. Then repeat using same filter and the Lucas after what about 300 miles?
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Old 12-02-2007, 03:42 PM   #10
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Quote:
Originally Posted by SPOILEDRED94
Thanks a lot. There seems to be some confusion though. Heres my plan correct me where I am wrong: warm the trannsmission, drain the fluid, replace the filter, use existing filter seal. Clean pan and magnet. Using best available gasket (leaning toward original metal reinforced rubber gasket) replace pan. Then add 5qts fluid. Level the car. With engine @ idle run through the gears with the car stationary. add fluid slowly until level is mid cross hatch point. Drive car a bit and top off fluid. Then repeat using same filter and the Lucas after what about 300 miles?

Correct... This is what I would do....... Once you get it into the cross hatch, run it through the gears again to make sure, then drive it and check it again



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