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Old 06-21-2018, 04:39 PM   #26
Red Sleeper
 
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Name: Red Sleeper
Title: Too Much Time
Status: Not Here
Join Date: Aug 2009
Location: Lone Star State
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Posts: 4,582
Quote:
Originally Posted by thatguy69 View Post
Everything I've read says to run no smaller than -8an. Dave goerend told me the same thing. I ran -8 on mine with 1 cooler under the bed and 1 cooler in the grill, I have a hard time hitting 160 in the pan even when it's 90f

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If memory serves, isn’t the supply and return fittings on the transmission restricted by a smaller port within the fitting itself? Something has to restrict the flow of the ATF for heat dissipation when passing through the cooler.
So it would be of no benefit to run larger lines than OEM, or that port size.

Or am I thinking of a different transmission all together? Somewhere I have seen this smaller port in the fitting before.
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'14 Silverado LTZ 5.3 4wd
'05 Cummins QCSB 4wd 48re
'91 Cummins w350 5spd
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