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Old 01-08-2003, 06:16 PM   #1 (permalink)
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need Ford 9inch ID help...

okay I found a Ford 9" under an 81 F-100 2wd that has 31 splines and a 5 on 4.5 bolt pattern. I didn't have time to pull the third member to check the ratio, any idea what it is? The tag on the diff only says "WDM ADD 1F17 3 25 9 S311B" which doesn't seem to include a ratio number or ring and pinion numbers anywhere.

I may just need to go back and pull the third....
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Old 01-08-2003, 07:01 PM   #2 (permalink)
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Re: need Ford 9inch ID help...

Quote:
Originally posted by BrettM
okay I found a Ford 9" under an 81 F-100 2wd that has 31 splines and a 5 on 4.5 bolt pattern. I didn't have time to pull the third member to check the ratio, any idea what it is? The tag on the diff only says "WDM ADD 1F17 3 25 9 S311B" which doesn't seem to include a ratio number or ring and pinion numbers anywhere.

I may just need to go back and pull the third....

The ratio is 3.25:1 and the ring gear size is 9"

If it said '3L25 9' then it would have been a limited slip.

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Old 01-08-2003, 07:35 PM   #3 (permalink)
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ahhh, it does make sense, but what kinda freakin ratio is 3.25? hasn't Ford ever heard of 4.10s... oh well... thanks
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Old 01-08-2003, 07:38 PM   #4 (permalink)
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wait! I just had an idea! I'll swap a third from a truck w/ 4.10s and it'll still cost the same. Any tips on what years/models have 31 spline thirds with 4.10s would be great.
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Old 01-08-2003, 07:50 PM   #5 (permalink)
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Quote:
Originally posted by BrettM
wait! I just had an idea! I'll swap a third from a truck w/ 4.10s and it'll still cost the same. Any tips on what years/models have 31 spline thirds with 4.10s would be great.
did you try a search?

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Old 01-08-2003, 08:49 PM   #6 (permalink)
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Re: need Ford 9inch ID help...

Quote:
Originally posted by BrettM
okay I found a Ford 9" under an 81 F-100 2wd that has 31 splines and a 5 on 4.5 bolt pattern.
I somehow doubt that the bolt pattern is 5 on 4.5........
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Old 01-08-2003, 08:55 PM   #7 (permalink)
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Re: Re: need Ford 9inch ID help...

Yes, I did try a search, both on google and here, I spent probably an hour doing it too. problem is, google links to mostly car sites, not trucks, and it's hard to search for 9 inch stuff on here because it won't let you search with "9".

Quote:
Originally posted by liliysdad


I somehow doubt that the bolt pattern is 5 on 4.5........
and yes, the bolt pattern is 5 on 4.5! I was suprised too, I thought they were all 5 on 5.5. I triple checked it against a Cherokee D30 that was nearby. Being a Jeep guy, I was very excited about this find.

So let it be known: there is such thing as a Ford 9inch with 31 splines and 5 on 4.5!
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Old 01-08-2003, 09:44 PM   #8 (permalink)
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There was never a F150 with a 5 on 4.5 bolt pattern, so my guess is you have found an 9in rear from a car., so it aint gonna be 31 spline

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Old 01-09-2003, 12:53 AM   #9 (permalink)
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Quote:
Originally posted by liliysdad
There was never a F150 with a 5 on 4.5 bolt pattern, so my guess is you have found an 9in rear from a car., so it aint gonna be 31 spline

I never said it's from an F-150, it's from an 81 F-100. It is not from a car, since it is bolted under a TRUCK and about 64" wide. And I pulled the shafts and COUNTED 31 splines. And measured the bolt pattern, and compared it to an XJ.

THIS IS A FORD 9 INCH WITH 31 SPLINE AXLES AND 5 on 4.5 BOLT PATTERN (yes, I know I'm yelling )

now all I need is a 4.11 third...
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Old 01-09-2003, 01:04 AM   #10 (permalink)
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F150s and F100s are the same thing. I will say it again, there was never a 5 on 4.5 full size ford truck. I dont know where the rear came from, but it damn sure aint a full size ford truck rear. Just because it was bolted under a truck dont mean it came from a truck. I am glad you found it, but I guarantee it came from a car, and was swapped to the truck. How much you wanna bet you go back and the front of the truck is 5 on 5.5? 31 spline axles came in cars as well, and the width matches closely the rear of Ford full size cars.

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Old 01-09-2003, 04:51 AM   #11 (permalink)
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Don't say it never existed just because it sounds stupid...
Ford in one of it's brighter ideas equipped the 80-82 F100's with power brakes with the car 5 on 4.5 bolt pattern and 31 spline axles, not only do they have funky axles, but, they also have specific brakes, and, up front, they have different rotors, spindles and calipers.... For the F100's last year in 1983, they got the standard 5 on 5.5 pattern and standard issue F150 brakes.
Any of you guys don't believe me, I'll bet my 82 manual brake(5 on 5.5 bolt pattern) F100 Chassis with 230 hp 300 I-6 and NP 435 on it...
Ah, hell, here's a truck with it:


For an early 80's F100, 3.25's are rather low gears, my 82 had 2.75's, and an O/D tranny from the factory, and, I have seen trucks with 2.47's and O/D.. criuse at 70 MPH at idle... LOL

This is what happens when you own your own damn fleet of trucks, you get to know useless information...

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Old 01-09-2003, 06:29 AM   #12 (permalink)
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Quote:
Originally posted by liliysdad
F150s and F100s are the same thing. I will say it again, there was never a 5 on 4.5 full size ford truck.
'

Never say never!

Try searching posts from a year ago. This subject is not new. It was settled last year when most (myself included) thought the same way.

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Old 01-09-2003, 09:31 AM   #13 (permalink)
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Well, shit, ok, the beer is on me. I was sure Ford had never pulled the ignorant Dodge thing, guess I was wrong.
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Old 01-09-2003, 11:05 AM   #14 (permalink)
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well, it sounds like you finally believe me, but I'll bring the digital camera next time anyway
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Old 01-09-2003, 11:36 AM   #15 (permalink)
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I sincerely apologize.......
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Old 01-09-2003, 06:17 PM   #16 (permalink)
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I can't give you much help on your quest for 4:10s, but I can tell you that I just pulled a set of axles out of a 1977 F150 that had 4:10s - and no, I don't want to sell
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Old 01-09-2003, 07:32 PM   #17 (permalink)
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Okay, I won't start a new post until I search some, but can anyone give me some tips on how to remove the third member? I got all the bolts off, and the axleshafts out, then I had the whole axle hanging by the yoke and I was jumping on it. Still nothing. I gave it some good sideways whacks too from a couple different directions, trying to loosen it up.
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Old 01-09-2003, 09:44 PM   #18 (permalink)
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did you remove the copper washers that were underneath the nuts?? These will hold things in real well. Next get a thin wide screw driver and gently tap it in between the case and housing to split the gasket.



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Old 01-11-2003, 10:01 PM   #19 (permalink)
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hmmm, copper washers eh? guess I couldn't see them under the grease thanks



and btw, I have pics, if you don't believe me that this axle exists, I'll email them too you.
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Old 01-14-2003, 08:28 PM   #20 (permalink)
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Actually I've seen THREE different spindles used on the '80-82 F100's.

the '80's had the stamped and welded "beams"
(like an '83 Ranger beams)and a unique spindle

There was allegedly a "middle" design used on some '81's but don't quote me on this...
The basic implication is that only did ford have a "better idea" (FEEL the dripping sarchasm...)
but they couldn't make up their damned minds...

The later ones had Forged "I-beams" and a different balljoint setup and that later design spindle that is actually the same as the Large bolt pattern F-150 2wd, only the rotor is unique

All you have to do on the '82's with the last design is swap on F-150 rotors with the larger lug pattern.

One of the neater possibilities is that the balljoint arraingement on the last setup has the same balljoint spacing as the Forged I-beam 2wd '84-88 Rangers.

Think about those 11" rotors on a 2wd Ranger
Hell I wanna do it to my little trash hauler just to se if it can be done

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Old 01-15-2003, 05:06 AM   #21 (permalink)
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Alan: My 80 F100 has forged beams with kingpins(spindles and brakes are 79 issue)... Mind you, it's a manual brake 5 on 5.5 truck... My 82 has the stamped steel beams, also, a manual brake truck...
I haven't been close enough to an 81 to crawl under and inspect the front end yet, But, I wouldn't be suprised to find something alltogether different.
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