Page 1 of 1
drop box theroy lesson. skool me.
Posted: Wed Oct 14, 2009 7:40 am
by mhgill
Ok, I've decided castor plates are ****, coz you have to drill your diff. But how can dropping the rear of the radius arms 1-2" via a drop box fix the castor problems caused by a 5" lift? Wouldn't they both need to be dropped 5"?
Posted: Wed Oct 14, 2009 9:29 am
by Auto-Craft
You need a new tape measure ;-)
Drop boxes fix the whole geometry compared to plates [yuk] or new arm [expensive castor plates]
Re: drop box theroy lesson. skool me.
Posted: Wed Oct 14, 2009 10:14 am
by coxy321
mhgill wrote:Wouldn't they both need to be dropped 5"?
Yes. Technically if you drop your diff by 5 inches (ie lift kit), you will need to drop the other end of the radius arm by the same distance.
Posted: Wed Oct 14, 2009 4:46 pm
by Tiny
you can get away with some castor variation hence a 2" lift not needed castor correction. If you drop the back of the radius arms say 3" with 4" or 5" springs you still have a variation in the OE castor, but it is within acceptable tollerence just as with a 2" lift
make sence
Posted: Wed Oct 14, 2009 5:12 pm
by chunderlicious
another advantage of drop boxes is that the arm drops back to horizontal. meaning bumps are less harsh on the hit as the arm travels up and back instead of up and forward in the arc as done with plates or arms.
Posted: Wed Oct 14, 2009 11:48 pm
by turps
chunderlicious wrote:another advantage of drop boxes is that the arm drops back to horizontal. meaning bumps are less harsh on the hit as the arm travels up and back instead of up and forward in the arc as done with plates or arms.
Have seen some nasty chassi damage from drop boxes. I am guessing they came loose on the chassi mount or there was already some wear and tear.
Posted: Thu Oct 15, 2009 1:52 pm
by Auto-Craft
turps wrote:chunderlicious wrote:another advantage of drop boxes is that the arm drops back to horizontal. meaning bumps are less harsh on the hit as the arm travels up and back instead of up and forward in the arc as done with plates or arms.
Have seen some nasty chassi damage from drop boxes. I am guessing they came loose on the chassi mount or there was already some wear and tear.
Must of been a design or fitting issue.
COuldnt be as bad as tall lifted trucks with castor plates etc punching the mount out of the chassis, because of the big arm angle though.
Posted: Thu Oct 15, 2009 2:58 pm
by turps
To true Darren. Thats why I like the idea of caster arms. But as far as how the suspension works. Drop boxs do make the axle travel in a slightly better arc.
As the bend in the radius arm does move the axle forwards slightly on up travel.