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Old 09-12-2011, 08:33 PM
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What gear oil should I use for my Ford 9"?

I have a narrowed ford 9" in my 73 Duster. It has a full spool and 3.93 gears. What type/weight of oil should I use?

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Old 09-12-2011, 08:36 PM
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also, the rear is running 30in tall mickey thompsons, the tranny is a 727 with a shift kit and manual valve body, and the engine is putting out over 500 foot pounds of torque.
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Old 09-13-2011, 12:00 AM
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I like Lucas 90 wt. The climbing lube. We use it in the funny cars and it works great there too. Just because the R&P failed big time last week, it wasn't the gear lube fault. haha
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Old 09-13-2011, 10:12 AM
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I went to the website, and there was no straight 90wt, did you mean the 80w-90 or the 75w-90 synthetic?

http://www.lucasoil.com/products/dis...?iid=6&catid=6
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Old 09-13-2011, 08:17 PM
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80-90 is what's in mine now. I have a Detroit locker diff too.
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Old 09-13-2011, 11:10 PM
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ok so you dont need friction modifier either. I'll probably go buy it tomorrow. The only other stuff I've found that has been recommended (cause I do like to punch it a lot on the street) is Redline Heavy Shockproof Gear Oil. I dont know if I will need it, I haven't been to the drag yet, but I do like to slam the pedal as much as I can.

http://www.redlineoil.com/product.aspx?pid=44&pcid=8
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Old 09-14-2011, 02:34 AM
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A lot of complaints about seal leaks when using Synthetic oil.
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Old 09-14-2011, 03:24 AM
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We use the 85-140 in both funnycars too. I haven't seen any oil problems in either car.
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Old 09-14-2011, 04:17 PM
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Quote:
Originally Posted by adam83
ok so you dont need friction modifier either. I'll probably go buy it tomorrow. The only other stuff I've found that has been recommended (cause I do like to punch it a lot on the street) is Redline Heavy Shockproof Gear Oil. I dont know if I will need it, I haven't been to the drag yet, but I do like to slam the pedal as much as I can.

http://www.redlineoil.com/product.aspx?pid=44&pcid=8
It's your car but I have to ask, how well does your Duster drive on the street with a full spool? Those are usually strictly for the drag strip.
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Old 09-14-2011, 11:29 PM
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well it's not bad actually, I just dont drive it in the rain (which I wouldn't do anyways) and I dont break the tires loose around corners. I stay cautious of uneven parts of road and just pay attention. The full spool isnt my first choice for a street car either, but this 9" came with it and I haven't been able to afford the swap I want to do. The weight savings is nice though, and not having to worry about a posi going bad is nice.
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Old 09-15-2011, 12:11 AM
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My Strange 9" came with 85W140 gear oil and Currie recommends it too.

http://www.lucasoil.com/products/dis...how&headTitle= - Lucas Heavy Duty 85W-140 Gear Oil
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Old 09-15-2011, 12:46 PM
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Quote:
Originally Posted by S10 Racer
It's your car but I have to ask, how well does your Duster drive on the street with a full spool? Those are usually strictly for the drag strip.
When driven with common sense a spooled diff don't drive all that bad. All the talk about NOT being able to turn corners is not true.
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Old 09-15-2011, 03:57 PM
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Quote:
Originally Posted by prostreet6t9
When driven with common sense a spooled diff don't drive all that bad. All the talk about NOT being able to turn corners is not true.
I know you can turn corners with them, we use one in our S10. I would be more concerned about the stresses put on the axles and related parts.
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Old 09-15-2011, 04:30 PM
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Quote:
Originally Posted by S10 Racer
I know you can turn corners with them, we use one in our S10. I would be more concerned about the stresses put on the axles and related parts.
I've had mine in a big HP and big tire car for 6 years and never any problems or axle related breaks. Most of my customers that are doing a big HP car request spools and no problems with them either.

Granted these cars are driven to cruise nights and around town on nice days.NOT what you would put 10K miles a year on. However I do like to use at least a 35 spline axle also.
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Old 09-15-2011, 04:31 PM
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I agree. The only horror stories I've head of is when you're already cruising and you gun it around a corner, get sideways and then your tires bite and the car flips. I dont know if this actually happens but I've heard it.
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