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Discussion Starter #1
so since the commander is based off the GC. anybody know if the exhaust headers and such will fit on the commander? what exactly is the difference between the 2 as far as mechanical and layout? thanks
 

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The engines are the same. Chassis is the same - spring rates might be different because the Commander weighs more. Wheelbase is identicle - Commander is about 2" longer, and this length is added behind the rear wheels. So, the exhaust would be longer, from the rear axle back. Some of the dash board, console, parking brake are shared, but the bodies are completely different. :eek:rangehat:
 

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Discussion Starter #3
so theoretically the exhaust manifolds should be the same then right? would the GC srt8 maniflods fit the commander?
 

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I'm not sure what the difference is between the std Hemi and the SRT8 hemi is. If the heads are different, the manifolds/headers might not bolt up. :eek:rangehat:
 

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The engines are the same. Chassis is the same - spring rates might be different because the Commander weighs more. Wheelbase is identicle - Commander is about 2" longer, and this length is added behind the rear wheels. So, the exhaust would be longer, from the rear axle back. Some of the dash board, console, parking brake are shared, but the bodies are completely different. :eek:rangehat:
So ...... where does the chassis end and the body begin???????
 

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Discussion Starter #6
is a unibody. the front frame ends about the front of the cab i believe
 

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so theoretically the exhaust manifolds should be the same then right? would the GC srt8 maniflods fit the commander?
I am sure that you know this but the SRT8 has the 6.1 Hemi and it is different from the 5.7 Hemi. I think the heads on one has a "D" shaped exhaust port for the heads and one is oval, if I recall correctly. I am just thinking out loud here.
 

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I'm not sure what the difference is between the std Hemi and the SRT8 hemi is. If the heads are different, the manifolds/headers might not bolt up. :eek:rangehat:
http://www.allpar.com/mopar/new-mopar-hemi.html


The SRT engine includes numerous modifications from the standard Hemi, such as:
  • Reinforced bulkheads.
  • Larger cylinder bores, by 3.5 millimeters, honed with torque plates to ensure a truer bore.
  • Oil squirters, aimed at the underside of each piston, aided by a special oil pump pressure relief valve.
  • Modified oil pan and windage tray.
  • Larger-diameter, flat-top pistons with high-load capability.
  • Revised connecting rods using higher-strength powder metal material. New floating piston pins.
  • Crankshaft forged from micro-alloy steel, in tri-metal main bearings, with retuned damper.
  • Head ports designed with larger cross-sectional area. This allows 11 percent higher flow in the intake ports, and 13 percent higher flow in the exhaust ports.
  • A billet steel, high-strength camshaft features more overlap and lift for better performance.
  • Intake valves feature hollow stems and 2 mm larger heads. The hollow exhaust valve stems are filled with sodium to dissipate heat. Premium valve springs with external dampers enable higher engine speed operation to 6,400 rpm and allow the peak output engine speed to increase to 6,000 rpm from 5,000 rpm.
  • Specially designed intake and exhaust manifolds.
  • Cast aluminum intake manifold with shorter, larger-diameter and tapered runners for high-speed tuning. Internal runners are core-dipped to smooth the runner finish and improve air flow.
  • 14% higher fuel injector flow capacity; higher-flow air cleaner box with a tuned resonator delivering a deep performance sound character (and good for an extra eight horsepower).
  • Exhaust headers are individual tubes encased in a stainless steel shell. Exhaust runners allow increased gas flow while maintaining fast catalyst light-off, while adding 12 horsepower over the 5.7-liter engine’s cast manifolds.
  • Dual knock sensors with premium fuel.
 

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Thank you, jeep5253. I knew there were differences for the HP gains, which includes bigger ports for breathing. The listing was for the 5.7 SRT8 Hemi, so if one wanted to use the headers, one would have to also swap the heads. :eek:rangehat:
 

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Discussion Starter #10
I saw that several times in my search but didn't seem clear.
 
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