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Author Topic: rear end identification...  (Read 1643 times)

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Offline Cookieboystoys

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rear end identification...
« on: June 09, 2013, 06:26:31 AM »
anybody know the door data plate codes for rear ends? door plate says 7

1979 Bobcat
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Offline 289Wagon

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Re: rear end identification...
« Reply #1 on: June 09, 2013, 08:13:21 AM »
 I can't say for sure on a '79 but I have this for '73-'78. NOTE!! code 7 for '71-'72 is different - 3.18 non-locking.
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Offline Cookieboystoys

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Re: rear end identification...
« Reply #2 on: June 09, 2013, 09:04:12 AM »
? 3.40 ? I didn't think they offered that except for 1973 in a pinto? maybe I can jack it up and read the tag.
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Re: rear end identification...
« Reply #3 on: June 09, 2013, 09:37:34 AM »
door plate says 7

Opps! My Bad.... code is an 8 not 7 which at 2.78 sounds right for a 4 spd  79 pinto/bobcat, autos had 3.08 and I have one of thoes too.
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Offline Wittsend

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Re: rear end identification...
« Reply #4 on: June 09, 2013, 10:35:56 PM »
While the post isn't 8" specific, the title is enticing. So I'll throw this out for anyone interested. I believe only the 3.00, 3.40 and 3.55 were available for the 8" rearend.  Some of the ratios seem to cross over between the 6-3/4" and the 8" (3.40 seemingly one of them).

  Every time I go to Pick A Part (monthly - Sun Valley, CA) I check the 8" rears.  The majority sadly have the center sections already pulled.  There is one guy who at a minimum goes through weekly and pulls them all. Virtually all are 3.00 and a few 3.55.  When I did my turbo swap I opted for the 3.00 thinking the Pinto was lighter than the Turbo Coupe and the 13" or 14" tires would work well. Ahhh..., not so much.

 Ideally I think 3.25 would be best with shorter 13"-14" tires.  But that ratio is limited to only a few older Fords. Otherwise it is the price of aftermarket gears and setup. So my quest is now for 3.40 as a compromise.  If your running 16" tires you might get away with 3.55.  Please note these ratios are referenced to daily driving.

Tom