Ford 9 inch
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Elder User
Joined: Jun 2015
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From: York Pa.
Ford 9 inch
Hello, I'm trying to figure out what gearing I should go with. I just found out my truck has a single drive 3.25 Ford 9 inch rear end instead of a Dana 44 3.00 single drive that was suppose to be in my truck. My truck is a 1976 long bed, manual 3 speed, 2 wheel drive with a 302. My truck is very sluggish when I romp on it and I would like to have more power down low. I know my engine could use a little help but I also want to get the best gearing for my truck. Would there be much difference if I went from 3.25 rear gears to 3.70 rear gears? Any suggestions would be appreciated.
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Elder User
Joined: Jun 2015
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From: York Pa.
I have 28 inch diameter tires and I also have a 3.03 speed transmission I just converted from a worn out column shifter to a Hurst mastershift floor shifter.
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From: Sioux Falls Area
I had 3.73s in my 5.0 explorer and really liked the way that felt. Great towing power. In 3rd gear, 65mph was 3,000 rpm with 235/75r15 tires.
if you can stand to turn the rpms, it would be a good combo . IMO of course.
if you can stand to turn the rpms, it would be a good combo . IMO of course.
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Elder User
Joined: Jun 2015
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From: York Pa.
My old thread but new question. My differential leaks fairly good so I wanted to top it off. It is an open differential, I don't know if that makes a difference in what oil I should put in it but I went ahead and bought Valvoline SAE 80W90 oil. I want to add I have no idea what is in it now but I am not wanting to pull it apart until I'm ready to change gears.
Lead Driver
Joined: Sep 2003
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From: SoCal
Straight gear oil is fine for open diffs. Clutch type limited slip diffs may need adding the friction modifier to reduce clutch chatter.
How bad is the leak? If you let it run dry, you may end up changing the gears sooner than you expect.
How bad is the leak? If you let it run dry, you may end up changing the gears sooner than you expect.
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Elder User
Joined: Jun 2015
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From: York Pa.
My differential does have a constant wet spot but hopefully no damage done as of yet. I hope to put 3.73 possi in by fall. I do have clutch chatter also but thought that was is the transmission?
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Lead Driver
Joined: Sep 2003
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From: SoCal
The clutch type LSD can chatter when going around turns, especially under load. Since your diff is open, it can't make that kind of noise. So your chatter is more likely from some place else. Could be from a worn (or oil soaked) clutch in a manual transmission.
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Elder User
Joined: Jun 2015
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From: York Pa.
Yes, I unfortunately have a rear main seal leak also. Most likely the reason but also need to replace all my rubber bushings as they are badly worn. I definitely have a project truck.😫$$$$
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