It is powered by a 6.1-litre HEMI V-8 producing 420bhp and uses a four-wheel drive system to help it accelerate from 0-62 mph in 5.0 seconds, achieving a top speed of 152mph.
"When Jeep set out to create its quickest-ever model, it was with the race track rather than mud track in mind," said Peter Lambert, managing director of Chrysler Group UK.
"The SRT-8 is not intended to be off-road capable. Instead, with this injection of SRT DNA, the new Grand Cherokee SRT-8 establishes a fresh benchmark for high-performance SUVs. It has the raw power to out-perform a Porsche Cayenne Turbo at a fraction of the price," said Lambert.
The aim of the four-wheel drive system is to maximise the on-road traction available to the driver, while being robust enough to handle the upgraded HEMI engine’s power and torque.
The new model features side sill extensions, a new front and rear fascias, air intake ducts and five-spoke 20-inch aluminium wheels.
The Grand Cherokee SRT is priced at £40,585 on-the-road and is on sale in the UK now.