The 2008 Grand Cherokee SRT8 with the 6.1L Hemi is a high-performance SUV that's hard on transmissions, cooling systems, and engine internals when driven aggressively or neglected. Most catastrophic failures trace back to heat management and maintenance lapses.
NAG1 Transmission Overheating and Cooler Failure
Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: transmission slipping or harsh shifts, limp mode activation, burnt transmission fluid smell, coolant in transmission pan or vice versa
Fix: The factory transmission oil cooler fails internally, mixing coolant and ATF which destroys the NAG1 transmission. Immediate flush if caught early (~3 hrs labor), but usually requires transmission rebuild or replacement plus external cooler upgrade (12-16 hrs total labor). External cooler install is mandatory to prevent repeat failure.
Estimated cost: $4,500-7,500
Dropped Valve Seats and Catastrophic Engine Failure
Occasional · high severity
Typical onset: 80,000-130,000 mi
Symptoms: sudden loss of compression on one or more cylinders, severe misfires, metallic rattling from engine, coolant consumption with no external leaks
Fix: The 6.1L Hemi has a known issue with valve seats coming loose from the cylinder heads, especially on engines run hard or overheated. Once a seat drops, it destroys pistons, cylinder walls, and often the crankshaft. Requires complete engine rebuild or replacement (25-35 hrs labor). Short block replacement is common fix.
Estimated cost: $8,000-15,000
Rear Transmission Mount Failure
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: severe clunk on acceleration or deceleration, vibration through drivetrain, visible sagging of transmission tailshaft, difficulty shifting into park
Fix: The rubber mount tears or separates due to the torque from the Hemi. Requires lifting transmission slightly to replace mount (2-3 hrs labor). Upgraded polyurethane mounts available but increase NVH.
Estimated cost: $300-600
Fuel System Starvation Under Load
Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: hesitation or stumble during hard acceleration, limp mode at wide-open throttle, fuel pressure drop under load, intermittent rough idle
Fix: Fuel filter (in-tank sock) clogs or fuel pump weakens. The high-performance nature of this engine stresses the fuel system. Requires fuel tank drop and pump/filter assembly replacement (4-5 hrs labor). Some techs recommend upgrading to higher-flow pump if tracking the vehicle.
Estimated cost: $800-1,400
Piston Ring Land Failure from Detonation
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: excessive oil consumption (1 qt per 500-1000 mi), blue smoke on startup or acceleration, loss of power, low compression on one or more cylinders
Fix: Poor fuel quality, carbon buildup, or aggressive tuning causes detonation that cracks ring lands on pistons. Often affects multiple cylinders. Requires engine teardown, inspection, and replacement of damaged pistons and rings at minimum (20-30 hrs labor). Full rebuild recommended if one cylinder fails.
Estimated cost: $6,000-12,000
Cylinder Head Gasket Failure
Occasional · high severity
Typical onset: 90,000-140,000 mi
Symptoms: coolant loss with no visible leaks, white smoke from exhaust, rough idle when cold, oil residue in coolant reservoir, overheating
Fix: Head gaskets fail due to age, overheating, or cylinder pressure from modifications. Requires cylinder head removal, resurfacing, and MLS gasket upgrade (14-18 hrs labor both heads). Often discover warped heads requiring machining or replacement. ARP studs recommended for boosted applications.
Estimated cost: $3,500-6,000
Owner tips
Install an aftermarket transmission cooler immediately—the factory cooler WILL fail and destroy your $5K transmission
Use premium fuel only and run periodic fuel system cleaners to prevent carbon buildup and detonation
Monitor oil consumption closely; anything over 1 qt per 3,000 mi indicates ring issues developing
Change transmission fluid every 30,000 mi with Mopar ATF+4—these NAG1 units are sensitive to fluid condition
Keep detailed service records; engines that survive are those with religious maintenance and no overheating events
Buy one only if you have a $5K repair fund and maintenance records proving regular fluid changes—these are brutally expensive when they break, but exhilarating when maintained properly.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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Fitment notes: High performance application requires battery with minimum 750 CCA for 6.1L Hemi engine
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Every control module on the 2006-2009 Jeep Grand Cherokee SRT8 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ VIN and mileage programming required. Mileage must be transferred from old cluster or documented per federal law.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Chrysler Group LLC (Chrysler) is recalling certain model year 2008 Chrysler 300 vehicles manufactured May 31, 2007, to May 12, 2008, Dodge Magnum vehicles manufactured May 23, 2007, to May 12, 2008, Dodge Charger vehicles manufactured May 24, 2007, to May 12, 2008, Jeep Commander vehicles manufactured April 3, 2007, to May 12, 2008, and Jeep Grand Cherokee vehicles manufactured March 21, 2007, to May 12, 2008. In the affected vehicles, the ignition key (FOBIK) may not return to the "ON" position after being rotated to the "START" position, instead sticking between the two positions. Potentially, while the vehicle is being driven, the ignition may inadvertently move through the "RUN" position to the "ACCESSORY" or "OFF" ignition position, turning off the engine.
Consequence: If the ignition stays between "START" and "ON" positions it could cause loss of certain electrical functions. If the ignition key inadvertently moves into the "OFF" or "ACCESSORY" position, the engine will turn off, which will then depower various key safety systems including but not limited to air bags, power steering, and power braking. Loss of functionality of these systems may increase the risk of crash and/or increase the risk of injury in the event of a crash.
Remedy: Chrysler will notify owners, and dealers will replace the ignition switch and key FOBs, free of charge. The recall began August 19, 2015. Owners may contact Chrysler customer service at 1-800-853-1403. Chrysler's number for this recall is P57.
POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE) · 13V175000
2013-05-07
Chrysler Group LLC (Chrysler) is recalling certain model year 2005-2010 Jeep Grand Cherokee vehicles manufactured February 11, 2004, through March 9, 2010; and 2006-2010 Jeep Commander vehicles manufactured January 31, 2005, through March 10, 2010. A transfer case electrical failure may result in an unintentional shifting of the transfer case into the neutral position.
Consequence: If the vehicle shifts into neutral, it may roll away increasing the risk of a crash or personal injury.
Remedy: Chrysler will notify owners, and dealers will reflash the final drive controller which governs the transfer case, with new software, free of charge. The recall began on August 15, 2013. Owners may contact Chrysler at 1-800-247-9753. Chrysler's recall campaign number is N23.
SUSPENSION · 09E039000
2009-06-19 · PE09005
ROCK KRAWLER IS RECALLING 44 PERFORMANCE SUSPENSION SYSTEMS SOLD AS AFTERMARKET EQUIPMENT FOR USE ON THE VEHICLE LISTED ABOVE. THESE SUSPENSION SYSTEMS WERE PRODUCED WITH GRADE 2 CARRIAGE BOLTS INSTEAD OF THE PROPER GRADE 5 CARRIAGE BOLTS. THE IMPROPER GRADE 2 CARRIAGE BOLTS COULD EXPERIENCE A LOSS OF CLAMPING FORCE FOR THE BOTTOM STRUT FORK.
Consequence: THIS CONDITION COULD CAUSE A LOSS OF EFFECTIVE LIFT AND LOWERING OF THE AFFECTED VEHICLE, POSSIBLY CREATING THE DRIVER TO PANIC WHICH COULD POSSIBLY LEAD TO A VEHICLE CRASH.
Remedy: ROCK KRAWLER WILL NOTIFY OWNERS AND PROVIDE A FREE REMEDY. THE SAFETY RECALL BEGAN ON OCTOBER 15. 2008. ALL THE AFFECTED UNTITS HAVE BEEN REMEDIED. OWNERS MAY CONTACT ROCK KRAWLER AT 1-518-270-9822.
ELECTRICAL SYSTEM · 08V059000
2008-02-06
CHRYSLER IS RECALLING 1,338 MY 2008 JEEP GRAND CHEROKEE AND COMMANDER VEHICLES. THE FRONT CONTROL MODULE MAY HAVE BEEN INCORRECTLY MANUFACTURED.
Consequence: THIS COULD CAUSE THE ENGINE TO STALL WHILE DRIVING OR NOT TO START AND/OR CAUSE THE WINDSHIELD WIPERS TO BECOME INOPERATIVE. ENGINE STALLING OR INOPERATIVE WIPERS COULD CAUSE A CRASH WITHOUT WARNING.
Remedy: DEALERS WILL INSPECT THE MODULE AND REPLACE IT IF NECESSARY. THE RECALL BEGAN ON FEBRUARY 18, 2008. OWNERS MAY CONTACT CHRYSLER AT 1-800-853-1403.
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER · 07V415000
2007-09-12
ON CERTAIN SPORT UTILITY VEHICLES, FRONT BRAKE CALIPERS IN A CERTAIN LOT MAY HAVE BEEN MANUFACTURED FROM GRAY IRON INSTEAD OF DUCTILE IRON AS DESIGNED AND COULD FRACTURE WITHOUT WARNING.
Consequence: THIS WOULD INCREASE THE VEHICLE'S STOPPING DISTANCE AND COULD CAUSE A CRASH.
Remedy: DEALERS WILL INSPECT THE FRONT BRAKE CALIPERS TO SEE IF THEY FALL INTO THIS LOT AND, IF SO, WILL REPLACE THEM FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 22, 2007. OWNERS MAY CONTACT DAIMLERCHRYSLER AT 1-800-853-1403.
Performance
Horsepower
420hp
Torque
420lb-ft
0–60 mph
4.6sec
Quarter mile
13.1sec
Top speed
155mph
Capability & size
Towing capacity
3,500lb
Payload
1,000lb
Curb weight
5,050lb
Wiper blades
WK generation Grand Cherokee SRT8. Symmetrical front wiper configuration.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2008 Jeep Grand Cherokee SRT8 6.1L V8 Hemi and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.