They increased in reliability and strength in the early to mid-eighties and essentially hit their stride in the late-eighties.
The 231 has continued in the trend of chain-driven cases and is one of the most successful and popular of them all.
Katerra Lewis, he said, had gone to a nightclub with a friend who was the person she was staying with.
"It is believed that while the mother and friend were at the club, the 8-year-old viciously attacked the 1-year-old because the 1-year-old would not stop crying,'' Edwards said.
Despite the different nomenclature, they are essentially the same transfer case, with the bulk of their parts interchanging.
Chain driven transfer cases were first used in the 1970's with partial success - Jeep's Borg Warner Quadra Trac being a notable instance.
The bottom line is an innocent young baby lost her life and that should be a wake-up call for our community." Kelci Devine Lewis, who turned 1 in May, was found unresponsive in her crib at a.m. Authorities have said there were visible injuries to the girl.
The girl's mother is charged with manslaughter after police say she left her young daughter in the care of a group of children while she partied at a nightclub. "There are just too many deep rooted issues in this horrific crime.
The 231 has a driver's side front output and centerline rear output.
The NP231 features two ranges; a low range gear that is a respectable 2.72-to-1 (the lowest of all the Jeep transfer cases with the exception of the NP241OR) and a direct-drive in high range.
Grandmother Waynetta Callens said in an earlier interview that they were staying there temporarily with friends while Katerra Lewis waited for Section 8 housing of her own.
Edwards said Kelci was left alone that night in the home with five other children, ages 2, 4, 6, 7 and 8.