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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,010 Posts
Welcome to Allpar. Is the P/S reservoir filter screen possibly plugged with debris? This filter isn't serviced separately. Any whine?
The reservoir should be replaced whenever an old pump sends debris into the system following a thorough system flush if the pump comes apart or the fluid gets contaminated.
At higher RPM the pump may be able to overcome the restriction.
If you had P/S assist for 5 minutes after the pump replacement then everything else sounds OK.

ATF+4 (MS-9602) is an acceptable replacement fluid, but you don't want to mix old and new. See TSB #19-005-03:

http://www.wjjeeps.com/tsb/tsb_wj_1900503.pdf
 
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