Truck-leasing company Ryder System Inc. said Tuesday that its third-quarter net income jumped 33 percent, boosted by cost cuts and fleet size adjustments.

Ryder also boosted its full-year profit prediction, and its shares rose nearly 6 percent in premarket trading.

The Miami-based company earned $75.1 million, or $1.47 per share, up from $56.5 million, or $1.10 per share, in the same quarter last year.

Excluding discontinued operations, the company posted a profit of $64.3 million, or $1.26 per share, for the recent quarter.

Revenue was flat at $1.57 billion. Lease and rental revenue rose 2.8 percent to $693.9 million, but was offset by drops in services and fuel services revenue.

Analysts, on average, expected a profit of $1.18 per share on $1.62 billion in revenue, according to a FactSet poll.

Ryder attributed its better-than-expected profit to improving contractual revenue growth and strong used vehicle sales, along with cost and rental fleet size adjustments that began earlier in the year.

Pre-tax earnings at the company's fleet management business jumped 21 percent to $94.3 million, helped by lower compensation-related expenses and growth in its lease fleet. Revenue at the business increased 1 percent to $1.12 billion.

Ryder said that despite the current economic weakness and uncertainty, it expects its profit to continue to grow this year and boosted its full-year earnings prediction to a range of $3.93 to $3.98 per share. The company previously predicted a range of $3.75 to $3.90 per share.

Analysts expect a 2012 profit of $3.82 per share.

The company also issued a fourth-quarter profit guidance of $1.06 to $1.11 per share, while analysts expect earnings of $1.06 per share.