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09-20-2011, 07:34 PM | #1 |
Senior Member
Join Date: Mar 2011
Location: Northwest Iowa
Posts: 117
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9 inch rearend swap
hello everyone,
9 inch rear end out of what??????..... would be a good bolt in for a F1? i am looking for a little better road speed with out rapping out my flathead. right now going down the highway at 40 mph the engine is running 2000 rpm. i am thinking a 9 inch with 3.50 gears. .......but what would be a good bolt up, i heard a 71 F100 is close. what do you think???? thank you. |
09-20-2011, 07:52 PM | #2 |
Senior Member
Join Date: May 2010
Location: Alexandria, NH
Posts: 117
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Re: 9 inch rearend swap
Early Bronco is your best bet.
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09-20-2011, 08:01 PM | #3 |
Senior Member
Join Date: May 2010
Location: Pittsburgh
Posts: 271
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Re: 9 inch rearend swap
I have used everything from a 55 Chevy rear with 3.8 gears to a 8.8 with 3.7. Nine inchers are becoming expensive, nice to know you have alternatives.
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09-20-2011, 08:11 PM | #4 |
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Join Date: May 2010
Location: Midland Park, NJ
Posts: 3,982
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Re: 9 inch rearend swap
Any of the 57 to 80's?? F100/F150 rears will fit. So I am told, they are the same width and have the same bolt pattern (5 X 5 1/2). I also heard that the spring mounts are in the same place.
I think in the 80's sometime the rears became wider. I don't know what year this occured. Measure it if you find one. |
09-20-2011, 08:15 PM | #5 |
Senior Member
Join Date: May 2010
Posts: 281
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Re: 9 inch rearend swap
I used a 9" out of a 1972 two wheel drive ford pickup. Width is perfect for a F1. Do a search on Ford 9" you will get all the specs you need to start your search. I have mine behind a T-5 and love how my flatty runs at freeway speeds.
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09-20-2011, 09:28 PM | #6 |
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Join Date: May 2010
Location: Julesburg, Colorado
Posts: 714
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Re: 9 inch rearend swap
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09-20-2011, 09:33 PM | #7 |
Member
Join Date: May 2010
Location: Easley, SC
Posts: 51
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Re: 9 inch rearend swap
I have a 9" with a 3.25 ratio in my 53 F-100. Mild flatty, and stock tranny. Cruises @ 60 just a lil over 2000 rpm's. Best bolt on I ever did. The axle came from a 71 F-100.
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Brad Duncan |
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