10-10-2025, 06:09 PM
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#19 |
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Senior Member
Join Date: Dec 2014
Location: Fort dodge, Iowa
Posts: 1,460
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Re: Rear Diff Swap
I have long wondered what is a "safe" RPM for an extended amount of time for the average 21 stud old Flathead V8 engine with decent oil pressure. With the 4.11 gear in my 36 pickup I rarely exceed 50 MPH. I tend to stay on "pleasure" roads where I can putt along about 40 MPH enjoying the sights and sounds.
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