Kam talked about this in MURDER DOG ('01) as did Solo (a big dude who's a homie of Kam's) in THE SOURCE (late 2000, I think).
Cube evidently wasn't up on business as he should have been--Pat Charbonnet, who managed his Street Knowledge company, allegedly focused most of her attention on Cube and ignored Kam, Yo Yo, etc., causing their financial ends to suffer. While Da Lench Mob's GUERILLAS IN THE MIST went gold, everyone elses' CDs (Kam's included) weren't promoted like they should have been. Solo told THE SOURCE that after LETHAL INJECTION, Cube started getting "scandalous" and was "having other people make him tough," not wanting to make himself accessible to hear Kam's (and the others') problems...The "chain" thing Big Breaded referred to goes like this (and bear with me on the length):
In 1996, Cube was doing the Westside Connection thing, which involved throwing up the 'W'. Kam and Solo objected to this for two reasons: First, the "W" that the WSC was throwing up was supposed to actually be a sign used by a Watts gang (Kam is from Watts). Second (as reported on Davey D's webpage), even though WSC claimed to be defending West Coast street rap, Kam and Solo felt that there was a hidden meaning behind it all. They interpreted the whole "Westside" thing as Cube, Mack and Dub promoting THE WEST SIDE OF SOUTH CENTRAL L.A. (i.e., Compton, Inglewood, etc.) as being "superior" to the rest of South Central L.A. (Watts, where Kam is from, is located in the Eastern section of South Central L.A.).
Now, during this time, Cube was feuding with Cypress Hill (who claimed Cube stole their "Throw Your Set in The Air" hook and applied it to his "Friday" song). The two sides had gone back and forth dissing each other. In THE SOURCE, Solo claimed that while cruising in early '97, he ran into Cube on a street, and that Cube signaled for Solo to pull over. Solo and Cube got out of their cars. Cube allegedly threw up the 'W" and started acting like he wanted to fight, which they did. Solo said he hit Cube, and that Cube acted like he was knocked out, but when Solo turned his back, Cube jumped on him. They struggled back and forth for a minute or two, the end result of which involved Solo grabbing Cube's broken "W" chain and running off with it, before Cube had a chance to do anything else (some stories claim that Cube really WAS knocked out, but this is the way Solo told the story in THE SOURCE article I read). Solo then presented the chain to B-Real (from Cypress) and B-Real flashed it on stage at several Cypress concerts, teasing Cube to "come get it."
Kam and Cube settled their differences at a Nation Of Islam/Hip-Hop summit in Chicago sometime during '97. Kam told MURDER DOG, "in life, you have to keep business business, and personal things personal." Kam also said that while "Whoop Whoop" was a great song, he regrets that his more conscious and much better material didn't get the attention that "Whoop Whoop" did.
PEACE!