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Old 06-11-2009, 07:28   #1 (permalink)
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Rear Differential Identification

Hello All,

I am restoring a Ford 1949 F1 Pickup. I have dropped a 302CI engine & AOD transmission from a 1985 Lincoln Continental into it. I have also installed a rear end from a Ford Granada. The rear end tag reads:

WER V 5MC
2 75 8 7 575B

I'm assuming the gear ratio is 2.75:1. Is the ring gear an 8" or a 8.7"?
Also I am uncertain of the year of build. I believe with an automatic overdrive transmission, I need to consider swapping the gears for a 3.73 or 4.11 ratio.

Any thoughts?
Thanks
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Old 06-11-2009, 15:06   #2 (permalink)
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Re: Rear Differential Identification

Hope this helps

Ford 7.5 Years Used on Granada: (1981 - 1982)
10 bolt rear cover with 7.5" ring gear. Has c/clip axles with 28 splines.

Ford 8.0 Years Used on Granada: (1975 - 1979)
Drop out style rear end with 8" ring gear. Has removable pinion support on the front. Uses 28 spline axles.

Ford 9.0 Years Used on Granada: (1975 - 1980)
Drop out style rear with 9" ring gear. Available in both 28 and 31 spline. Has removable pinion support.
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Old 06-11-2009, 15:17   #3 (permalink)
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Re: Rear Differential Identification

Thanks JWKO,

Since I'm not sure of the year of the vehicle, I was hoping to pin it down from the info on the tag. You mentioned a 10 bolt year for the 7.5". Is the 7.5" the only year to have the bolt on rear cover? I have a 10 bolt rear cover that is basically square with rounded corners.

Thanks....
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Old 06-11-2009, 15:51   #4 (permalink)
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Re: Rear Differential Identification

According to the site I used for the info, the 10 bolt was only used in 81-82.

Randy's Ring & Pinion. The Differential Experts. Auto Parts & Services.
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Old 06-12-2009, 07:02   #5 (permalink)
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Re: Rear Differential Identification

This is the standard tag layout from the '80s-up.


There are many axles with a bolt-on rear cover, including the VERY common 8.8" & several Danas.

Gear selection isn't based only on the trans; you also have to consider the tire size & the engine RPM you want at a particular speed. So it involves everything from the engine to the ground. There are several gear calculators throughout the web - do some Googling.
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Old 06-12-2009, 07:39   #6 (permalink)
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Re: Rear Differential Identification

Thanks for all your help.....

I am going to assume this rear has a 8.7" ring gear w/ a 2.75 ratio. It was maufactured in July 5, 1985. Is this rear what they call the 9" w/ a smaller rear gear?

As far as changing the gears, I will wait till I have it on the road to decide.

Thanks.....
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Old 06-12-2009, 11:28   #7 (permalink)
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Re: Rear Differential Identification

Change that year to 1975. Orielly's doesn't have a 1985 Granada on their list. They do show a 1975 Granada and they also show it to have a 8.7 rear.
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