Change tranny fluid question
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Change tranny fluid question
Can I change tranny fluid fluid by hooking up rear transmission line to tube,drain by running motor, then drop the pan to change filter?
74 econoline clubwagon, 5.0L 302, C-4 transmission (square with 11 bolts).
Thanks
74 econoline clubwagon, 5.0L 302, C-4 transmission (square with 11 bolts).
Thanks
Posting Guru
Joined: Feb 2007
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From: Pittsburgh,Pa.
No don't run the engine.Drop the pan (it will make a mess) then remove the access plate for the converter bolts and turn the engine by hand.There should be a drain plug in the converter.Remove the plug and let it drip.Hope this helps.
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Joined: Oct 2003
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From: MICHIGAN
Not a good idea.
Do you open an oil galley on your engine and start it up to drain the oil? The trans needs oil too! Add a drain plug the tranny pan and the next flush will be a lot less messy.
https://transmichigan.com/catalog/pr...roducts_id=744
Do you open an oil galley on your engine and start it up to drain the oil? The trans needs oil too! Add a drain plug the tranny pan and the next flush will be a lot less messy.
https://transmichigan.com/catalog/pr...roducts_id=744
Posting Guru
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I do it that way all the time. There's a really good article on how to do it HERE.
Comparing this procedure to an engine oil change doesn't make sense. This is not an engine. That parts of the trans that are lubricated by the cooler return oil are the parts that only turn while the truck is moving. As long as you do this procedure while you're parked, not driving, you'll be fine like all the others that have done this.
Comparing this procedure to an engine oil change doesn't make sense. This is not an engine. That parts of the trans that are lubricated by the cooler return oil are the parts that only turn while the truck is moving. As long as you do this procedure while you're parked, not driving, you'll be fine like all the others that have done this.
Post Fiend
Joined: Oct 2003
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From: MICHIGAN
Originally Posted by Casey
I do it that way all the time. There's a really good article on how to do it HERE.
Comparing this procedure to an engine oil change doesn't make sense. This is not an engine. That parts of the trans that are lubricated by the cooler return oil are the parts that only turn while the truck is moving. As long as you do this procedure while you're parked, not driving, you'll be fine like all the others that have done this.
Comparing this procedure to an engine oil change doesn't make sense. This is not an engine. That parts of the trans that are lubricated by the cooler return oil are the parts that only turn while the truck is moving. As long as you do this procedure while you're parked, not driving, you'll be fine like all the others that have done this.
Even that article advises not to let it run too long (stop when bubbles appear). Those bubbles are cavitating the pump! By the time you see the bubbles coming out of the return line the pump has been cavitating for a period of time.
Posting Guru
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I've read a very similar procedure in a Ford manual. They publish that method for transmissions that don't have torque converter drain plugs.
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Post Fiend
Joined: Oct 2003
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From: MICHIGAN
I would like to see a copy of that.
The only time the repair manual suggests removing the fluid line while the engine is running is for a Transmission Fluid Cooler Flow Test . In that test the fluid is immediaely returned to the transmission through a funnel placed into the dip stick tube.
The only time the repair manual suggests removing the fluid line while the engine is running is for a Transmission Fluid Cooler Flow Test . In that test the fluid is immediaely returned to the transmission through a funnel placed into the dip stick tube.
Remove fluid level indicator from fluid filler tube.
Place funnel in fluid filler tube.
Raise vehicle on hoist and position suitable safety stands under vehicle.
Remove cooler return line (rear fitting) from fitting on transmission case. Refer to Fluid Cooler Lines in the In-Vehicle Service portion of this section.
Connect one end of a hose to the cooler return line and route the other end of the hose up to a point where it can be inserted into the funnel at the fluid filler tube.
Remove safety stands and lower vehicle. Insert end of hose into funnel.
Start engine and run at idle with transmission in neutral range.
When fluid flowing from hose is all liquid, an adequate amount of fluid should be observed, approximately 946.24 ml (32 oz) delivered in 15 seconds. If adequate flow is observed, test is completed.
If the flow is not adequate, stop engine. Disconnect hose from cooler return line and connect it to converter-out line fitting (front fitting) on transmission case.
Repeat Steps 7 and 8. If flow is now adequate, refer to Section 07-02 for diagnosis of transmission fluid cooler. If flow is not adequate, service pump and/or converter assembly.
Place funnel in fluid filler tube.
Raise vehicle on hoist and position suitable safety stands under vehicle.
Remove cooler return line (rear fitting) from fitting on transmission case. Refer to Fluid Cooler Lines in the In-Vehicle Service portion of this section.
Connect one end of a hose to the cooler return line and route the other end of the hose up to a point where it can be inserted into the funnel at the fluid filler tube.
Remove safety stands and lower vehicle. Insert end of hose into funnel.
Start engine and run at idle with transmission in neutral range.
When fluid flowing from hose is all liquid, an adequate amount of fluid should be observed, approximately 946.24 ml (32 oz) delivered in 15 seconds. If adequate flow is observed, test is completed.
If the flow is not adequate, stop engine. Disconnect hose from cooler return line and connect it to converter-out line fitting (front fitting) on transmission case.
Repeat Steps 7 and 8. If flow is now adequate, refer to Section 07-02 for diagnosis of transmission fluid cooler. If flow is not adequate, service pump and/or converter assembly.
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