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Old 10-24-2006, 16:29   #1 (permalink)
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Question What rearend do I have?

Just wondering if there was a way to tell what rear axle/ratio I have by decoding the VIN...? If not, how would I find out? I know the turn the wheel and count method, and i also know the count the gear teeth method, but I dont feel like pulling it apart to find out. Anyone help me out? Thanks.

P.S.

I have the VIN handy if anyone has a decoder, or knows the codes.

Darren
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Old 10-25-2006, 07:25   #2 (permalink)
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Re: What rearend do I have?

If you can still read your door tag, the axle ratio is stamped on there useing a alpha/numeric code under section "AX" on the door sticker.

there is also a metal tag bolted on the top right of the rear end cover.
Normally, these cars got a 2.73 or 3.08 rear end gear. some cars got a 3.27 or a 3.55 and some got a locking (limited slip) differential.
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Old 10-26-2006, 05:21   #3 (permalink)
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Re: What rearend do I have?

axle code list;

G / H / 2.26
B / C / 2.47
8 / M / 2.73
7 / - / 3.07
Y / Z / 3.08
4 / D / 3.42
F / R / 3.45
5 / E / 3.27
6 / W / 3.73
2 / K / 3.55
A / - / 3.63
J / - / 3.85
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Old 10-26-2006, 14:54   #4 (permalink)
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Re: What rearend do I have?

how would you find out if you have a limited slip rear end?
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Old 10-26-2006, 18:35   #5 (permalink)
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Re: What rearend do I have?

Quote:
Originally Posted by bonneville92
how would you find out if you have a limited slip rear end?
hold brake, slowly give er gas till you start burnin out, one tire fire=no LSD. hahaha, sorry felt like soundin like a smart ass, I'm not sure. I'd love to have LSD myself... I'm stuck wit one tire fire.

darren
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1988 Crown Vic LTD LX
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Alpine CDA-9811, 800 watt MA Audio 2 ch, 2 12" Clarion ProAudios
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Old 10-27-2006, 09:28   #6 (permalink)
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Re: What rearend do I have?

If you really want to find out what rearend you have remove the differential cover...the ratio will be stamped somewhere on the ring gear. Also if you wanna find out if you have posi....just jack the rear end of the car up so that the wheels are off the ground spin one wheel towards the front of the car and watch the other wheel if its spinning the same way by golly you got a posi...if spinning the other way you got a wonder wheel...ive got a nice 3.55 posi unit for my car to put in yet along with the cage
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Old 10-27-2006, 13:05   #7 (permalink)
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Re: What rearend do I have?

C'mon people! Read my post!

You dont need to do a burn out or pull the cover, just read the door sticker.
posted under the "AX" section. For example, if you have an 8 under the AX section then you have an open 2.73 gear. if you have an M then you have a 2.73 limited slip.

If you can not read the door sticker or the door has been replaced and the sticker doesnt match the car, there is a stamped metal tag on the rear diff cover. the gear ratio is stamped on the tag. this tag also will indicated if the diff is locking or not. an "L" will be stamped between the gear ratio. For example, if you see 3 L 08, you have a locking 3.08 gear ratio. if you see 2 73 then you have a open/nonlocking 2.73 gear ratio.
Normally the first digit of the gear ratio will be hiden under the bolt head holding the tag in place.

If you happen to remove the cover just for shytes and giggles, the gear ratio is stamped on the outside of the ring gear.
In order to indentify a locking diff, there will a "S" shaped spring between the spider gears and you will clutches on either side of the axle gears.
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Old 10-29-2006, 07:05   #8 (permalink)
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Re: What rearend do I have?

thanks for the info, very informative, i will go and look and see whats in there, just curious. thanks again.
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Old 10-29-2006, 14:16   #9 (permalink)
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Re: What rearend do I have?

ok, well i looked and there is a 5 under ax, so i guess that would indicate that i have a 3.27 unlocked rear end.
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Old 10-29-2006, 16:42   #10 (permalink)
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Re: What rearend do I have?

You are correct ..... 3.27 Non-locking diff.
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