52's and a zero rate add a leafs

[F-ingrob]

Im putting 52's on the front and going to use 1'' zero rates and was wondering about the offset in the zero rates zero 1" and 1.5"
how much will the 52's move the axle forward i would like to keep it where it is which is the stock location or maybe an inch forward but thats it
its a 87 K5 and i already have cross over high steer and a pan hard bar and heavy duty high clearance cross member

 

[Carcinogen]

Chevy 52s are centered, so going from 48s to 52s will move the axle 2 inches. That being said you could use the zero rate to move it back 1.5 inches and only have it moved forward 1/2 inch from stock

 

[muddermilitia]

^ what he said. You could also use B-52 mounts from DIY4X. They have several sets of mounting holes so you could move the springs back a little and not even need the zero-rate. Although moving the axle forward helps a lot with fender & firewall clearance issues

 

[cybrfire]

Im putting 52's on the front and going to use 1'' zero rates and was wondering about the offset in the zero rates zero 1" and 1.5"
how much will the 52's move the axle forward i would like to keep it where it is which is the stock location or maybe an inch forward but thats it
its a 87 K5 and i already have cross over high steer and a pan hard bar and heavy duty high clearance cross member

Need more information before this question can be answered.

As stated, the regular fronts are 48, so the 52's are 2" longer in the front and in the back of the center pin for a 4" total difference. So, if you put the 52's in the front and bolt them into the stock hangers, you'd actually be moving your axle 2" further toward the rear of the truck.

Putting 52's on, in and of itself doesn't move the axle forward at all. It moves it rear ward. So, in order to move your axle forward while using 52's in the front, your hanger point in the front must then move greater than 2" forward. If you were to move that point 2" your axle would be relatively in the stock location.

Hope that helps. Get asked this question a lot and seems to be a lot of misinformation on the topic.

 

[cybrfire]

So, the question is, where are you mounting the front eye of the 52" spring?

 

[F-ingrob]

thanks for all the responses i appreciate the help I am using B52's and I am going to use the stock location of the rear hangers which have already been upgraded to the beefier type and longer shackles
I was just trying to save time with mounting the zero rates

 

[Kay86K5]

thanks for all the responses i appreciate the help I am using B52's and I am going to use the stock location of the rear hangers which have already been upgraded to the beefier type and longer shackles
I was just trying to save time with mounting the zero rates

If you put your front spring eye in the second hole back on the B52's and keep the hanger in the rear in the stock location, it will keep your axle in the stock location (not factoring in any zero rate)

 

[Stephen]

I'd offset the axle forward on the spring 1.5" with the zero rate and adjust axle position on the truck by moving the main eye around. This will help your approach angle. Factory springs are actually 47" and the factory main eye to center pin is 23.5". We often run a 22.5" main eye to center pin to help approach angle. With a 52" spring the main eye to center is 26" and moving the axle forward 1.5" gets you to 24.5" so you're still giving up some approach angle but it's better. You shouldn't base any of this off the shackle mounting point and shackle angle, that is set after the main eye position is set which is determined by where you want the axle.

 

[F-ingrob]

I'd offset the axle forward on the spring 1.5" with the zero rate and adjust axle position on the truck by moving the main eye around. This will help your approach angle. Factory springs are actually 47" and the factory main eye to center pin is 23.5". We often run a 22.5" main eye to center pin to help approach angle. With a 52" spring the main eye to center is 26" and moving the axle forward 1.5" gets you to 24.5" so you're still giving up some approach angle but it's better. You shouldn't base any of this off the shackle mounting point and shackle angle, that is set after the main eye position is set which is determined by where you want the axle.

thanks for the input the main thing is im trying not to mess with the steering geometry i have cross over but i am worried that i will have steering problems by moving the axle forward too much
i also have a pan hard bar and high clearance crossmember
will i lose any steering and develop bump steer by moving the axle forward