Will 720 ,3 inch lowering springs work on the 521

[Hybrid510]

Hello friends ..new to the group and tried to search ,but could not find the  answer ..I see a good way to lower the rear of a 521 is with 720 4x4 leaf springs..I see they have new 3 inch lowering 720 4x4 springs ..can you just add these springs with no lowering blocks ?  sorry if this has been asked before ..thanks for any input 

[datzenmike]

720, 620 and 521/510 rear leaf springs are all the same overall length.

 

720 leaves are almost flat when installed. Off the vehicle, if you string between the two eyelets and measure down the 2wd is 6.3 inches, the 4x4 is only 3.7 inches. So right away close to 3" different. The spring rate for the 720 is also much higher with the 4x4.

 

Makes no sense to want to lower a 720 4x4 with lowering springs. wtf? The whole reason for 4x4s to ride high is for ground clearance and larger tires.

[bilzbobaggins]

Is my memory correct or are the 84 4x4 springs the ones with the most drop?

[banzai510(hainz)]

I used Belltech 6202 with 2 deg angle.  cheap and EZ

[d.p]

1 hour ago, banzai510(hainz) said:

I used Belltech 6202 with 2 deg angle.  cheap and EZ

Do those require refilling the eye holes or they truly plug and play? 

[d.p]

FUCK re-drilling. 

[datzenmike]

2 hours ago, bilzbobaggins said:

Is my memory correct or are the 84 4x4 springs the ones with the most drop?

 

2 hours ago, datzenmike said:

 

 

720 leaves are almost flat when installed. Off the vehicle, if you string between the two eyelets and measure down the 2wd is 6.3 inches, the 4x4 is only 3.7 inches. So right away close to 3" different. The spring rate for the 720 is also much higher with the 4x4.

 

 

 

This is for the '84. I don't see why other years would be different. A spring shop can 'de-arch' your springs.

[Hybrid510]

Hey thanks for the info.So if you use stock 720 4x4 springs it lowers 3 inch and no need to add blocks ?

[datzenmike]

If on a 720 the difference is 3". I don't know what the 'free camber' or arch of an unladen 521 leaf spring is nor the weight on them.  

[banzai510(hainz)]

On 8/26/2022 at 11:55 AM, d.p said:

Do those require refilling the eye holes or they truly plug and play? 

NO they fit perfect on my 521

[greenthumb]

I thought I recalled someone saying the stack bolt is not in the same location and your axle ends up moving one direction or the other. It’s been a while, so ymmv

[d.p]

16 hours ago, banzai510(hainz) said:

NO they fit perfect on my 521

ima hold you to it and go buy them.  Do they come with bushings?