86+ D60 w/ Leafs.

[JohnnyU]

Apparently, and so is PowerPoint. I have them on my truck too....


Go measure them then, tell me what the Pin-Eye distances are. If I remember right, the RBV pin is 31" from one eye, and like 25" from the other eye, does that sound right?

A centered pin on a 63" spring should be right at 31-32" from pin to eye.

 

[NMB2]

Are you fawkin smokin crack Unes? Look at the spring eyes. The right eye is much further out on the GM spring compared to the RBV spring. I've got em on my truck. Pushed the front hanger 6" forward and it didn't pull my axle with it.

are YOU smoking crack Bray D lol.

the chevy spring is 63" compared to like 56 or 57" so of course its going to stick out further on one side with a centered bolt

and ya know, it looks like that front chevy eye is about oh.... 5-6" further out than on the RBV.



oh and about the front vs rear shackle... the advantage to having it in the rear is alot greater, you ever tried jamming big anchors up rocks and stuff.... not very easy... ya know?

 

[Toreadorranger]

Rear vs front shackle thread from pirate.

http://www.pirate4x4.com/forum/showthread.php?p=10403933

 

[Bray D]

Fawk me. That's what I get for ASSuming that the ranger springs had a centered pin. Keep an open mind Bray, keep an open mind lol.

oh and about the front vs rear shackle... the advantage to having it in the rear is alot greater, you ever tried jamming big anchors up rocks and stuff.... not very easy... ya know?

That's what I said, the trade off for d-shaft slip length is the approach angle.

Not questioning whether its worth it or not, just trying to dig up some tech to see if there were any other advantages of having rear shackles that I didn't know about.

Off to read the Pirate link...

 

[Bray D]

Ok read the link and heres the main points.

Rear Shackle:

1. As the suspension compresses going over an obstacle, it pushes the axle back, and the body forward, helping to increase momentum and "bump" over the obstacle.
2. Better approach angle.
3. More driveshaft slip needed through the range of motion.

Front Shackle:

1. As the suspension compresses, it pushes the axle forward - into the obstacle - increasing traction so you can climb the obstacle
2. Less approach angle
3. Potential to bend a spring if rammed into an obstacle due to the "non solid" mount.
4. Less drive shaft slip needed through range of motion

They go on to talk about the suspension reactions of both setups while going up and down hill, small changes in wheel base, etc.

 

[NMB2]

good link.... I kind of knew most of that stuff, just wasnt functioning in the brain very well after PT this morning to put it into words.

you have seen how mine are setup obviously... they tip way back... and it did cause a jacked pinion angle.. it was horrible. Shims are required but as long as they are steel shims, i dont see an issue.

i just read that pirate link, some of the info there about the axle moving back and forth and causing instability on downhills i think is no even worth thinking about, the WB moving 1-2" isnt going to cause you to Indo. I think the best points are approach angles, and ride quality.

 

[Bray D]

i just read that pirate link, some of the info there about the axle moving back and forth and causing instability on downhills i think is no even worth thinking about,

I agree. I think he was lookin a little too deep into it with that post.

 

[bradz71]

I think the risks you take with a forward shackle far outweigh the advantages. I could just see a spring pack breaking after you try to "lawn dart" into an obstacle, much like we did with my buddy's 5-ton truck. You almost have to fab up a front traction bar just so you don't bend a spring around.

Also with a front shackle I think you could be cursing yourself every time you need that extra approach angle.