Archived ATF change

[BSMcCauley]

I am trying to switch ATF to synthetic and have so far been unable to get more than 6 qts of the old fluid out of the transmission -- even using the much-discussed method of running the engine briefly with a cooler line diverted to a bucket. The pan has been down over 24 hrs now. Any ideas on replacing the remaining 11 qts of ATF up in there with the new synthetic?? An additional note: Trans temp ~ 100 deg, only way to get anything out of the cooler line was to put it in gear (transfer case in neutral, e-brake set). My truck is a stock '96 2500 4X4.

 

[Bob Wagner]

did you loosen the valvebody bolts?

 

[BSMcCauley]

Thanks for the tip. I loosened the larger bolts (11mm socket) and dropped the valve body about 1/8", draining out another gallon. Now I am up to 9. 5 qts drained, which leaves 7. 5 still up in there. Should I also loosen up all the torx-head screws? How much is going to stay in the torque converter?

 

[Extreme1]

You're about there. Mine drops 10 qts sitting overnight (anti drain back valve removed from trans line). Changing the TC was the rest.

 

[BSMcCauley]

Thanks for the prompt help with getting back on the road!