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Old 12-17-2002, 01:12 PM
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Unhappy Rear end swap required & I'm cunfussed

:I am looking for a ford 8" or 9" rear end 3 to 1 ratio, at the 52" to 54" wide
>range ?
>
>
>I live in El Cajon Ca & have a 1973 Datsun pick up that my SON & I are
>building up as a project car for him , that i have some gearing
>problems/questions on ......
>
>I put a 1979 chevy NOVA inline 250 6cyl low end motor motor (its stk rear
>end was 2.57) in my datsun pick up that has 4.875 to 1 ratio stk & I can
>only go only approx 45 mhp
>at about 3500 RPM
>
>Obviously I want to make this swap work ! , the datsun rear end is probably
>to wimpy for the bigger motor any way ! ? so going to a bigger rear end
>would be
>the smart choice in the long run any way .......now my dilima......I'm not
>looking to spend a bunch of money on a rear end so I woul desire a
>affordable route ?
>
>-which would probablly be a rear end out of a car in the junk yard or ? I
>saw a listing chart that said
>* 63-69 falcon 52" wide
>* 63-69 comet 52" wide
>* 63-65 fairlane 52" wide
>* 65-66 mustang 52" wide
>* 63-69 comet 52" wide
>* 66-69 fairlane/cyclone 54" wide
>* 67-70 mustang/cougar 54" wide
>* 60-64 ford/mercury 54" wide
>
>So I was thinking of changing the rear ends ?
>
>I was told my best bet would probably be to go with a ford 9" rear end .
>My existing rear end width is 53" wide so a 52" to 54" would be perfect ?
>
>I think for what I need in desired operating speed , desired operating RPM,
>with my tire size/dia (29"tall) a 3 to 1 ratio range is
>appropriate/desired.
>
>The old Nova rear end was 2.57 to 1 & my existing datsun rear end is 4.875
>to 1 .....so going to approx 3 to 1 is where I think I am headed for 65 MPH
>freeway & good general around town
>
>If you have any suggestions on my quest to solve this dilima I greatly
>respect your opinion & help ! (web sights or phone #'s appriciated)
>
>thanks so much for your help Dale smith El Cajon ca 619-691-2270
>
>
>
>
>

-- ______________
Leon Biesiadecki
Classic Concepts
suggested
Personally I think a 9" is overkill, they are harder to find because all
the drag racers and street rodders have grabbed most of them. The Ford
8" is a very good rear and can handle way more torque than your engine
can put out (it was used on many v8 cars) and are a lot cheaper. The
last 8" that I bought I paid $50 with the right gears and good brakes.
For highway cruising, the 2.79 rear that was common in Mustangs and
Falcons may be ideal. Some of them were also available in 3.0 to 1.

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Old 12-18-2002, 10:44 PM
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A 8" or 9" in the right width and ratio would be fine. Whatever you can get a price on is what I would go with. I don't agree that the 9" rears are getting hard to find. I can buy all I want for $100 complete. Sounds like an interesting swap, good luck.
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Old 12-19-2002, 02:50 AM
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Cool

Don't buy any rear setup if its not complete drum to drum and not to rusted, everything turns and dosn't scrape or not turn at all. No sende paying for scrap junk, you need a driveable piece.

Todd
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Old 12-19-2002, 08:35 AM
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Any of the ones you've listed will work fine. You do not need a 9" for your application. An 8" will more than handle the job.

Chances are that any rear you buy out of a junk yard will need to be checked completely by a local shop to make sure it's in reasonable condition. I picked up a GM 10 bolt at a swap meet a year or so ago that cost me big time to rebuild the posi unit. Just try to get some sort of guarantee with your purchase.

Good luck.

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Old 01-07-2006, 11:12 PM
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Rear End Swap

Go with the 6 cyl Falcon if you have four bolt datsun wheels....The datsun wheels go right on the falcon bolt circle....
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Old 01-08-2006, 05:20 PM
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Good to have you on the site.

I don't know where you got those numbers but there are NO Ford 8 or 9 inch rear ends that narrow.... The narrowest is 56= rare.... most 1957 to 1980 are 57 1/2 wide, some 2, 3, 4 inches wider than that. The 70s big car nines are very wide.

As for strength, the 1967 and newer are stronger.
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Old 01-09-2006, 11:10 AM
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I think those measurements are backing plate to backing plate, not axle end to axle end. Why not the rear end from a newer Nissan small pickup? That six isn't likely to break a four cylinder rear axle.
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Old 12-16-2008, 10:34 PM
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rearend

hi,assuming you have a later datsun truck,why not use a stock datsun rear from an auto equipped truck....plenty strong enuf for a stock small block.......if your son plans on building the motor i would get a rear from a toyota truck with an auto trans....should bolt in with no mods...............or as others have said a 9" ford is overkill....an 8" ford would work fine and spring pads are close enuf to bolt in and available ....any small body ford,merc prodcuct as you have on your list will do the trick........just as a note i personally did a toyota pickup with a 383"small block and auto trans........stock rear worked great...........mark
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Old 12-17-2008, 09:03 AM
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Quote:
Originally Posted by 56vicky
hi,

....an 8" ford would work fine and spring pads are close enuf to bolt in and available ....any small body ford,merc prodcuct as you have on your list will do the trick........mark
First THIS THREAD IS SIX (6) YEARS OLD.

Second, use the wheel to wheel distance on any rear end measurement.

Third, those listed rears vary in overall width by at least 2 inches. That is pretty significant.

Fourth, those listed rear ends, the spring perches vary by more than 4 inches from spring to spring. Hardly a bolt in situation.
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