Jeep Grand Cherokee Drivers Seat Frame' title='2004 Jeep Grand Cherokee Drivers Seat Frame' />How Jeep Made The Grand Cherokee Trackhawk Strong Enough To Survive 7. Horsepower. Its tempting to dismiss the 2. Jeep Grand Cherokee Trackhawk as simply a Grand Cherokee with a big Hellcat engine under the hood because that is, in essence, what it is. But shoving 7. 07 horsepower into a Grand Cherokee takes a lot more engineering effort than you might think. As Uncle Ben from Spiderman once said With great power come great axial, torsional and flexural loads. Or at least I think thats what he said. And if he hadnt died in that film, Uncle Ben almost certainly would have continued And if that power comes from a Hellcat engine, youd better start beefing up your drivetrain components. Jeep understands Uncle Bens wisdom, because unlike that small block Chevy swapped Wrangler you thought was a good idea in high school, the Trackhawk is a production vehicle. It cant immediately overheat, grenade its transmission, snap its transfer cases chain, shear its axle shafts, and leave you calling your parents for help from the schoolyardits got to actually be designed to take a beating from that brawny motor day in and day out. Jeep Grand Cherokee Drivers Seat Frame' title='2004 Jeep Grand Cherokee Drivers Seat Frame' />To accomplish this goal, Jeep strengthened the crap out of its flagship SUVs drivetrain. The transmission is now an 8. Unknown Soldier there. HP9. 5 instead of the 8. HP7. 0 thats in the standard 4. SRT, meaning it can handle 9. Since the second generation Torque. Flite transmissionwhich gets a new torque converter with brazed bladesis longer than the wimpy 4. The Heated Seat Kit is designed specifically for each applicable vehicle and they are approved for installation on both cloth and leather seats. Each kit contains. SRTs, the Quadra Trac transfer case had to be shortened by 3. But despite its smaller size, the T case has actually gotten stronger, with its innards now including a pair of forged sprockets wrapped with a wider chain. Heres a closer look at that wider chain That single speed transfer casewith a front clutch that has a 1,4. SRTs. That driveshaft bolts up to the rear differential, which gets a new housing with four mounting points to spread out the load, whereas the standard Grand Cherokee SRTs rear drive module has only three. Heres another angle of that rear diff Inside that differential housing sits a 2. The pinion gear also gets a double pass shot peening treatment, which is a cold working process meant to increase the gear teeths resistance to bending fatigue. That ring gear bolts to a carrier with four spider gears instead of just the two found in the lesser SRTs diff, whichin theorymeans the loads resulting from that Hellcat trying to move 5,4. Jeep_Cherokee_7878.jpg' alt='2004 Jeep Grand Cherokee Drivers Seat Frame' title='2004 Jeep Grand Cherokee Drivers Seat Frame' />Once that limited slip rear differential which is capable of handling almost 2,0. SRT8, ultimately transferring power to those rear wheels to propel the Jeep forward to 6. Despite the significant revisions to the transmission and to the rear part of the drivetrain, the portion of the drivetrain twisting the front wheelsin other words, the front driveshaft, differential, and axle shaftsis the same as that of the current Grand Cherokee SRT. Thats because, as Jeep engineers told me, peak drivetrain stresses occur during track driving, which is normally done in the transfer cases track mode. Nvidia Geforce4 Ti 4200. Since the track mode setting splits the engines power 7. Motor Trend reviews the 2005 Jeep Grand Cherokee where consumers can find detailed information on specs, fuel economy, transmission and safety. Find local 2005 Jeep. Jeep says it has determined via analysis and testing that the front drivetrain out of the standard SRT can handle without issue the high stresses imposed by that mighty Hellcat. But, of course, Hellcat ing a Grand Cherokee SRT took more than just toughening up some drivetrain goodies. The cooling system also had to be modified. Youll notice that fog lights are absent on the Trackhawks lower fascia. In their stead sits an engine oil cooler, tasked with keeping engine temperatures down during track driving. And on the other side theres an air scoop feeding 1,0. CFM of air at full engine power to the supercharger. Theres also a new full face low temperature radiator at the front of the cooling module. Its job it is to keep the air charge temperature entering the engine below 1. Fahrenheit at all times to maximize engine power. As hot post supercharger air flows through the engine mounted charge air cooler seen below, heat gets transferred to the coolant in the tubes. An electric pump then sends that hot coolant to the low temperature radiator at the front of the Jeep, where that liquid is cooled off by ambient air. That now cooled antifreeze then flows back into the engines charge air cooler at a rate of about six gallons per minute, where it takes heat away from the post supercharger air charge, and the cycle begins again. The end result is denser air flowing into the engine at a pressure of up to 1. Jeep through the quarter mile in 1. On top of the bolstered drivetrain and the new cooling system, the engine also gets a new oil pan, a new catalytic converter setup, and new exhaust manifolds in order to fit into the underhood packaging space the latter two explain the Trackhawks 5 lb ft deficit versus the Charger and Challenger. Plus, FCA had to re tune the engine mounts for the heavier engine, recalibrate the active damping system to handle the higher loads, and tweak the springs and shocks. On top of that, to bring all that power and weight this thing weighs 5,4. Jeep Grand Cherokee Drivers Seat Frame' title='2004 Jeep Grand Cherokee Drivers Seat Frame' />Trackhawk sports huge 1. All this is enough to get the the Jeep from 6. So with the 2. 01. Grand Cherokee Trackhawk, Jeep has bolstered the drivetrain, made some engine alterations to account for packaging constraints, changed up the cooling system, and retuned the brakes and suspension. Those are just the hardware changes. Add to that all the validation testingwhich FCA engineers told me included a 2. RPMhigh load track test wherein the Jeep had to undergo five 2. Fahrenheitand that motor swap begins to sound a lot more arduous than all those small block Chevy projects youve watched on You. Tube. So while it may look like Fiat Chrysler just slapped the big Hellcat engine into its standard Grand Cherokee and called the result The Trackhawk, theres a whole lot more going on under the sheetmetal of this SUV than just a straight engine swap. It turns out, slapping an engine into something meant for volume production that has a warranty isnt nearly as simple as it sounds.