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post #1 of (permalink) Old 02-10-2001, 02:00 AM
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Here\'s my rear axle #\'s

Alright guys, I guess I am stupid. I have been looking through old posts (up to the last 46 pages) and I have pulled axle codes and everything else. I cannot figure out what size my axle is. I know I have low gears, running about 3 grand at 65 MPH with 32"tires, and I am an engineer but too lazy to do the calculations. I am holding my rear axle tag in my hand, here is exactly the way the numbers are printed:

S318D
3 50 9 6G17

What the hell does this mean?????????

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post #2 of (permalink) Old 02-10-2001, 02:07 AM
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Re: Here\'s my rear axle #\'s

The first 4 digits of the second line are the ratio and diff type. Yours has a 3.50 gear set, and an open diff. If it was limited slip, it would say "3L50...". The other digits are build, brake, date, and option codes, but the "9" in the 6th position on the second line may mean it's a 9"; are there studs with nuts facing forward?

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post #3 of (permalink) Old 02-10-2001, 12:42 PM
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Re: Here\'s my rear axle #\'s

Thanks Steve. All along the damn numbers were right in front of my nose. Yes it is a 9", I have had it out before. I thought it had a 4.1 in it. Kinda wish it did now. I don't know a lot about rear ends but the guy I took it to when I had it checked out said it was a heavy duty 9", said it how 4 spider gears. Does that make any sense?

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post #4 of (permalink) Old 02-10-2001, 02:32 PM
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Re: Here\'s my rear axle #\'s

All diffs have 4 gears in the carrier - 1 on each axle & 2 on the cross shaft. If this guy thinks that makes it HD, look for someone else to work on it!

BTW Just because the tag says 3.50, that doesn't mean someone hasn't changed them. Either count the teeth on the R&P, turn the shaft and measure the turns PRECISELY, or pull the chunk and look at the tooth counts stamped into the edge of the ring gear - otherwise, you can't be sure.

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post #5 of (permalink) Old 02-10-2001, 10:18 PM
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Re: Here\'s my rear axle #\'s

Thanks for the info. Actualy, I would say that I am the one who doesn't know what they are talking about. The guy who told me I have a heavy duty rear end is my neibors brother-in-law. The guy is a Ford expert and builds race cars. When me and my neibor run into problems with a vehicle, we always contact him, he has yet to steer us wrong. This was over a year ago when I took out the rear end so I must have misunderstood something.

post #6 of (permalink) Old 02-10-2001, 11:39 PM
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Re: Here\'s my rear axle #\'s

That didn't sound right to me, so I looked it up. According to my chart, if you're running 3K at 65 without overdrive, you've got at least 4.10's, maybe even a little lower gearing, like 4.27 or 4.56? I would definitely double check your tooth count before assuming that tag is correct.

It's a Jeep thing? My Bronco thing will run over your little Jeep thing.

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post #7 of (permalink) Old 09-21-2001, 06:34 PM
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Re: Here\'s my rear axle #\'s

Muddy,
can you check your chart for me. I'm running about 70 tacking a RCH o 2k. My tag on dif reads
3L55 886A23
I'm assuming I have 3.55 with limited. Very cool on the limited but 3.55 sucks for 35 tires.
Keep in mind I was reading the same with my 31" tires before the lift.
Now with the 35's on, I'm sure I'm doing a lot faster then what is indicated.

BTW: is limited slip as good as a loker? I guess I have the factory Ford "Traction-Lok". Any feedback?
As always, thanks

post #8 of (permalink) Old 09-21-2001, 09:28 PM
 
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Re: Here\'s my rear axle #\'s

As for the question of LS being as good as a Locker....How well does a spork work as a spoon? The LS is just that Limited...ie..it will slip. The locker it, well locks it, which implies no slip.

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post #9 of (permalink) Old 09-24-2001, 05:00 PM
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Re: Here\'s my rear axle #\'s

96Bronc, definitely 3.55's, you're running the same size tire as me and mine is right at 2K at 70, though today it was more like 2800 because I had a head wind and the OD didn't want to kick in. I like the limited slip for driving around in the yard without tearing up the grass, but Havack's right, in the mud there's no comparison to a locker.


JEEP, it's what's for dinner.

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