What Tranny fluid are you running?

[AJP turbo]

I'm a begin believer in just doing drain and fills.  That's what I will be doing on my Flex ecoboost as it has worked great for me with my Taurus X (227k+ miles on original trans as stated a few posts above)

You dont get all the old crap out that way...better off to take a tranny cooler line off and let the car run..all the trash will come out of the converter

[66 Galaxie]

D4 or D6?

If you mean the trans in my Galaxie it is a C6


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[66 Galaxie]

I'm a begin believer in just doing drain and fills.  That's what I will be doing on my Flex ecoboost as it has worked great for me with my Taurus X (227k+ miles on original trans as stated a few posts above)

You dont get all the old crap out that way...better off to take a tranny cooler line off and let the car run..all the trash will come out of the converter

Very true, doing drain and fills is only a partial fluid change which does leave old fluid in the torque converter but they do a good job of diluting the old fluid with clean fresh fluid which makes a big difference.  Now up to 237k+ on the original 6F50 transmission in my '08 Taurus X doing drain and fills is working well for me.

[Cruxin]

Amsoil LV ATF....Top tier and a TRUE synthetic...no problems here

Do you run the same in the PTU as well?

[AJP turbo]

Amsoil LV ATF....Top tier and a TRUE synthetic...no problems here

Do you run the same in the PTU as well?

Yea 75w-140 in the ptu and 75w-110 in the rdu i think...whatever it calls for...cant remember

[ZSHO]

The RDU requires 80w-90 fluid,and the PTU IS BELOW.  Z                                Items Capacity Ford Part Name or equivalent Ford Part Number / Ford Specification
Power Transfer
Unit (PTU)
fluid (AWD)4
18 ounces (0.53L) Motorcraft® SAE 75W-140 Synthetic Rear Axle Lubricant XY-75W140-QL / WSL-M2C192-A
Rear
differential
(AWD) fluid
2.4 pints (1.15L) Motorcraft® SAE 80W-90 Premium Rear Axle Lubricant XY-80W90-QL / WSP-M2C19