It depends on which shackles you use. The MP offset shackles are .8" offset. Others are .5 (1/2"). That's why I always stuck with the MP.
Rusty's right. I moved my perches 3/4" with the MP set.
question
I understand the offset rear shackels and moving the spring perch,, but with that set up do you just leave the front spring mount in its stock location?
thanks
What's your opine on shimming the front hangars,as per the Mopar chassis book(per drag strip specs,not road racing) Just curious,on your thoughts,72 (002/003 springs...)It actually doesn't depend on what kit you use. While the MP kit claims to move the springs 3/4", if you actually measure the front hanger the difference is only 1/2" from stock.
I have a MP set on my Duster, and I measured it and compared it to the stock hanger when I read Dr. Diff's comment that the MP kit only had a 1/2" offset, just like his. There's only a 1/2" to the frame to move the front hanger. And because of the recessed bolts Dr. Diff uses, you don't have to cut a hole in the frame like you do to clear the front eye bolt like you do for the MP kit. I wish I'd known THAT before I installed the MP kit in my car.
You can put the perches in 3/4", and it will get you a little extra space, but it also puts a side load on the springs. I installed my MP kit with the perches at 42" C-C, so the springs are in line with no side loading.
No, the front hanger is offset as well, 1/2" inboard so the hanger is against the frame.
What's your opine on shimming the front hangars,as per the Mopar chassis book(per drag strip specs,not road racing) Just curious,on your thoughts,72 (002/003 springs...)
Description:
Hotchkis Sport Suspension has developed a Thrust Alignment kit for use with our leaf spring kits, or factory springs and hangers. The process is very simple and involves inserting the necessary shims between the leaf hanger and the body. (See Image Below). The kit consists of six (1/32") shims and allows for proper thrust alignment of the rear end.
You mean shimming between the frame and the hanger to correct the thrust angle right? Those are used in all kinds of applications, not just drag racing. Hotchkis sells shims with its springs to correct thrust angle,
But I'm not a drag racer, and I know that the SS springs have different arches and spring rates. The only thing about that is the thrust angle might tend to change a bit when you're under load, like launching the car, so the static thrust angle and the dynamic thrust angle might not be the same thing. In that particular case, I don't know that you'd always want to correct the static thrust angle, since you might care more about what it's doing at launch. Maybe someone that knows their SS springs or drag racing better than I do can comment. But typically, yes, you'd want to use the shims to correct the thrust angle of the rear.
No, the front hanger is offset as well, 1/2" inboard so the hanger is against the frame.
It actually doesn't depend on what kit you use. While the MP kit claims to move the springs 3/4", if you actually measure the front hanger the difference is only 1/2" from stock.
rrr nailed it. 3/4" offset front, center, and rear. can be done w/o cutting the original spring perches off . I did it------bobLook at these links. Anyone who can read a tape measure can see clearly that there is more than 1/2" offset in those shackles.
http://www.summitracing.com/parts/DCC-4120075/
Look at how the brackets are made. Yes, the studs ARE 1/2" offset compared to stock, however, the brackets are made so that they offset the rest. Look at how the bracket walls are offset as well. You cannot measure just the offset of the studs that hold the bracket on. You have to measure the entire amount, including the offset of the bracket itself. They move the spring inboard exactly what MP says they do. I have measured it enough that I can do it in my sleep.
http://www.summitracing.com/parts/dcc-4120077/applications/
It actually doesn't depend on what kit you use. While the MP kit claims to move the springs 3/4", if you actually measure the front hanger the difference is only 1/2" from stock.
I have a MP set on my Duster, and I measured it and compared it to the stock hanger when I read Dr. Diff's comment that the MP kit only had a 1/2" offset, just like his. There's only a 1/2" to the frame to move the front hanger. And because of the recessed bolts Dr. Diff uses, you don't have to cut a hole in the frame like you do to clear the front eye bolt like you do for the MP kit. I wish I'd known THAT before I installed the MP kit in my car.
You can put the perches in 3/4", and it will get you a little extra space, but it also puts a side load on the springs. I installed my MP kit with the perches at 42" C-C, so the springs are in line with no side loading.
No, the front hanger is offset as well, 1/2" inboard so the hanger is against the frame.
AMERICAN RACING HOT ROD
VN515 TORQ THRUST II 1 PC
COLOR
Polished
SIZE OFFSET
14" x 6 -2mm
14" x 7 0mm
15" x 4 -25mm
15" x 6 -6mm
15" x 7 -6mm
15" x 8 -18mm
15" x 8 0mm
15" x 10 -44mm
rrr nailed it. 3/4" offset front, center, and rear. can be done w/o cutting the original spring perches off . I did it------bob
I agree on all points.
note to RRR..... re-measure....try it awake this time.
something else to be aware of... i was told that 275/60R15's fit with the offset shackle kit.
Here's the proof. The others that only move them in 1/2 do not require a hole in the frame rail for the nut on the back side of the front hanger, the MP hangers do.
There is approx 9/16 space from factory front spring hanger to frame. No way to get the 3/4 MP claims.
There is approx 9/16 space from factory front spring hanger to frame. No way to get the 3/4 MP claims.
The measurement is not taken at the bracket. You must measure the inside of the spring in relation to the frame rail. You can clearly see in your own photo there is MORE than 3/4" between the inside of the spring edge and the frame rail. Yall keep on arguing all you want. I know what has worked for me in the past and I will continue to do it.