Questions

[podirtfarmer]

Hey new to the forum and have a question I have a 2002 Sierra with the 4.3 I want to put int the 4.8 I have access to a complete drive line and was wondering if this would be a straight drop in any help would be great thanks. And the forum looks like its full of info

 

[Molson02536]

Your going to have to make sure you have all the electrical wire harness and ECM for the drive train. With the coast of the conversion, your better off selling your Sierra and buying one with the 4.8 in it already. If it's more HP your looking for, remove the screen on the MAF sensor and the air restriction plate on the throttle body blade.

Remove the MAF fron the intake duck and place it on a bench. Turn the MAF screen side down and with a screw driver, work it though the MAF making sure you don't touch the filament. tap the screw driver with a hammer working your way around till the screen falls out. Reinstall the MAF and you done.

Remove the two torque screws from the throttle body blade. Clean the throttle body with throttle body cleaner to remove all the carbon build, and with the throttle body at WOT. Pull up on the blade till it's out of the throttle body, with the blade out. Cut off the half moon restriction plate and grind down the edges to a flat smooth surface. Reinstall in to the throttle body and add lock tight to the two torque screws and reinstall all other intake ducts removed.

Transmission, when servicing the transmission have them replace the servo's with the Corvette Servo's "$45.00" and that's done on the out side of the transmission, passenger side. Replace the boost valve with 0.490" or 0.500" Boost valve for a firmer shift, "45.00" also and can be done without dropping the valve body.

With this simple tuning, your cost will be around the $200.00 mark being the cost is from the transmission service and up grade.

Try this for now and see if that's enough Hp for now till you really want to get dirty up to your elbow in doing a full drive line swap. Good luck

 

[podirtfarmer]

I am looking at doing the swap because the truck was in a front end accident and I have to pull the motor and trans to check it out any ways so I thought why not look into the swap now

 

[Molson02536]

If that is the case, wait and see if you can find a 5.3 liter which is more common for the trucks since it was made for trucks. The 4.8 L and the 5.3 L are smaller truck versions of the LS1 and were designed to replace the 305 and the 350 in trucks. Both the 4.8 L and the 5.3 L share the same engine block and heads. Although the block of the 4.8 L/5.3L looks similar to the LS1, they are not of the same blocks.

The Vortec 4.8L produces 270 horsepower to 295 horsepower and 285 lb·ft to 305 lb·ft, depending on the model year and application.

The Vortec 5.3L Power output is 285-295 hp and torque is 325 lb·ft to 335 lb·ft.

The 6.0 L is a larger truck version of the LS1 and was designed to bridge the gap between the new small blocks and big blocks in truck applications. There were two version of this engine the LQ4 and the LQ9 being more performance oriented. Although the block of the 6.0L looks similar to the LS1, they are not of the same blocks also which gets most people confused.

The Vortec 6.0L is an iron/aluminum (2000 model year engines had cast iron heads) design and produces 300 horsepower to 345 horsepower and 360 lb·ft to 380 lb·ft.

just make sure you make the up grades to the 4L60E transmission you have to be able to take the extra torque from the engine and that's a simple as mentioned earlier to you on my other post. Good luck friend and keep me posted, be glad to hepl you on your project.