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Old 03-13-2017, 03:18 PM   #1
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Join Date: Sep 2013
Location: Park City, UT
Posts: 660
Should I change my Transmission fluid? 7.3 diesel?

I have 40k miles on my ford reman transmission on my 99 Quigley SMB 7.3. Fluid has not been changed since install in 2010. FWIW I've never towed anything with it. Should I change the fluid?

1999 7.3 4x4 RB50 SMB
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Old 03-13-2017, 03:51 PM   #2
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Location: Corvallis, OR
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Best stick to every 30,000 on the 7.3. I run way longer but the v10s don't eat them like the 7.3 does. Mostly because the v10 had a much smarter lockup a strategy that the diesel didn't get unless you run a programmer or lockup controller.

2000 E450 dually V10 wagon
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Old 03-19-2017, 03:44 PM   #3
Join Date: May 2016
Location: Texas
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...also replace the inline Magnefine filter while you're at it. They are often forgotten by DIY guys. It is 3/8" in/out hose sizes.
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