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www.ColoradoClassicBroncos.com - View topic - Questions on moving rear axle back 1"
It is currently Mon Jun 17, 2024 12:58 pm



Reply to topic  [ 13 posts ] 
 Questions on moving rear axle back 1" 
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Post Questions on moving rear axle back 1"
What is all needed to move the rear axle back 1"? I'm about ready to install the new suspension and am wanting to complete this as well...any pointers, suggestion, ect would be nice.

Thanks guys!

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Royce
1977 Bronco...EFI, ViperBuilt C4, PS, PB, cut with 33's - Rebuild coming
1987 Porsche 951...LS1 swap - SOLD
2006 4Runner V8 Sport Edition
1998 4Runner...DD with 333k and counting


Mon Nov 07, 2011 11:01 am
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Post Re: Questions on moving rear axle back 1"
You need new top plates on your leaves. These need to be beefy! mine are made from 3/8" plate and there is still a slight bow in them once I tighten down the u-bolts. This plate needs to have the center hole re-drilled 1" in front of where it is now. You also need to drill a new hole in the lower spring perch 1" forward of the existing. Your shocks may need some attention depending on how they are mounted.

You may get some rubbing in the rear inner fender, but only when flexing out.

J.D.

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1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
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Mon Nov 07, 2011 12:37 pm
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Post Re: Questions on moving rear axle back 1"
What about something like this...
http://www.offroaddesign.com/catalog/Zero%20Rates.htm

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Royce
1977 Bronco...EFI, ViperBuilt C4, PS, PB, cut with 33's - Rebuild coming
1987 Porsche 951...LS1 swap - SOLD
2006 4Runner V8 Sport Edition
1998 4Runner...DD with 333k and counting


Mon Nov 07, 2011 12:47 pm
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Post Re: Questions on moving rear axle back 1"
No, that adds height to the suspension. The plate you need sits on top of the leaf springs and simply sandwiches the spring pack to the axle.

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1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
http://www.ucora.org


Mon Nov 07, 2011 12:52 pm
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Post Re: Questions on moving rear axle back 1"

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1977 Sport, 351w OBDII EFI motor, 4R70W auto, 4:88 gears, ARB lockers, 3.5" suspension, 33" tires.


Mon Nov 07, 2011 2:18 pm
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Post Re: Questions on moving rear axle back 1"
Thanks guys, hoping to get the suspension installed this weekend.

Shocks are in the stock location, any issues?

Will pay attention to the drive shaft, but hoping to address them next summer anyways.

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Royce
1977 Bronco...EFI, ViperBuilt C4, PS, PB, cut with 33's - Rebuild coming
1987 Porsche 951...LS1 swap - SOLD
2006 4Runner V8 Sport Edition
1998 4Runner...DD with 333k and counting


Mon Nov 07, 2011 2:20 pm
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Post Re: Questions on moving rear axle back 1"
Those are all options; however, probably the best mix of strongest vs. easiest way to do it is to take apart the spring pack and drill another hole in the main leaf, that is 1" back from the existing hole. Then reassemble the spring pack with the group of bottom leaves centered on the new hole. This will retain the same spring rate and you're not adding leverage against things. Drilling holes in spring material can be time consuming if you don't have good bits and patience.
Joe

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'70 Bronco, MAF 5.0, NP435, D44/9", 4.10s, 33" MT/Rs, PS/PB
'71 Bronco, HP D60, Hi-9, 5.38/ARBs, 101" WB, 408 Stroker, AOD, Atlas, 40" MT/Rs, PiMP EFI.
'78 F150 SWB/Stepside/4WD, 351W/4R100/NP205, 35" KM2s, under const...
'81 Coachman Caper XL MH, 4WD, EFI 460/ZF/BW1356, D44/Sterling, 4.10s/35s, under const...
'83 Bronco, D60/Sterling, 5.13/ARBs, MAF EFI 351W/ZF/BW1356, 37" MT/Rs.
'12 Buggy, HPD60, Hi-9, 4.10s, Explorer 5.0, Atlas 4-speed, my chassis, EB skins.
And the latest project is a '99 Ranger Extra-Cab, custom frame/tube work, on 40s...


Tue Nov 15, 2011 2:47 pm
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Post Re: Questions on moving rear axle back 1"

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1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
http://www.ucora.org


Tue Nov 15, 2011 2:53 pm
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Post Re: Questions on moving rear axle back 1"

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Rob

74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.

04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine

New project: 77 Bronco Ranger, body work and more body work.

Very little left of a 72 durango tan explorer sport


Tue Nov 15, 2011 3:37 pm
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Post Re: Questions on moving rear axle back 1"
Yes, it is a lot easier to plunge cut with the plasma cutter, then clean the hole up. If you use the right size washer you can clamp it down and run the plasma around the inside of it and get very close to the correct size hole, requiring minimal drill use.
Joe

_________________
'70 Bronco, MAF 5.0, NP435, D44/9", 4.10s, 33" MT/Rs, PS/PB
'71 Bronco, HP D60, Hi-9, 5.38/ARBs, 101" WB, 408 Stroker, AOD, Atlas, 40" MT/Rs, PiMP EFI.
'78 F150 SWB/Stepside/4WD, 351W/4R100/NP205, 35" KM2s, under const...
'81 Coachman Caper XL MH, 4WD, EFI 460/ZF/BW1356, D44/Sterling, 4.10s/35s, under const...
'83 Bronco, D60/Sterling, 5.13/ARBs, MAF EFI 351W/ZF/BW1356, 37" MT/Rs.
'12 Buggy, HPD60, Hi-9, 4.10s, Explorer 5.0, Atlas 4-speed, my chassis, EB skins.
And the latest project is a '99 Ranger Extra-Cab, custom frame/tube work, on 40s...


Tue Nov 15, 2011 9:46 pm
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Post Re: Questions on moving rear axle back 1"

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Rob

74 Ranger EFI351w, 4r70w, ARB 5.13 9in, ARB 5.13D44, and a bunch of other goodies. Best of all the family memories.

04 Mustang Cobra, KenneBell 2.2 feeding a lot of boost on E85. Tire shredding machine

New project: 77 Bronco Ranger, body work and more body work.

Very little left of a 72 durango tan explorer sport


Wed Nov 16, 2011 7:10 am
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Post Re: Questions on moving rear axle back 1"

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1977 Sport, 351w OBDII EFI motor, 4R70W auto, 4:88 gears, ARB lockers, 3.5" suspension, 33" tires.


Sun Nov 20, 2011 8:14 am
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Post Re: Questions on moving rear axle back 1"
Haven't got to work on it...had an unexpected death in the family last week.

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Royce
1977 Bronco...EFI, ViperBuilt C4, PS, PB, cut with 33's - Rebuild coming
1987 Porsche 951...LS1 swap - SOLD
2006 4Runner V8 Sport Edition
1998 4Runner...DD with 333k and counting


Sun Nov 20, 2011 3:04 pm
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