[Daytrepper]

Heres the list of items you will need to change on a 02-04 3.5HO, to make it work in a 98-01. This applies to 2.7 conversions, as well as 3.2-3.5 swaps. To do this properly, you will need either a good core 3.2 or 3.5 98-01 engine as a parts source, or buy everything used indiviually.

If you are doing a 2.7 - 3.5 conversion, and using a 2002-2004 3.5 in a 1998-2001, you have to follow the instructions completely on the conversion itself, as well as these instructions.


You will need to change the following parts on the 02-04 engine with the same parts from a 98-01 engine:

1. Engine wiring harness
2. EGR valve & tubes
3. Intake plenum-- If you like, the 2004 3.5HO plenum could be used, but you would have to swap in the following parts from your 3.2 plenum and do the following modifications to the 2004 3.5 plenum:
a. IAT sensor
b. Throttle body
c. MT valve
d. SRV valve actuator-- '04 has an electric one, 01 and older has vacuum, it will bolt right up in place of the electric no problem.
e. You would have to drill out the egr tube holes. They are there on the 04 plenum, just blocked off.
f. You would also have to drill out the vacuum port for the vacuum reservoir and cruise control servo, again the ports are there, just blocked off.
4. Engine flywheel
5. SRV Valve Vacuum reservoir and hoses
6. Left camshaft sprocket. To change this, you will need to:
a. Buy the camshaft holding tool, OTC # 7999. 50$ cost roughly. It installs into the back of the camshaft and holds it in place so the camshaft sprocket can be installed in the proper position. Yes a timing belt can be changed without the tools, but it is critical that you use this tool when changing either of the sprockets. Not only is it next to impossible to keep the cam in the proper position, but you have to replace the bolts with new ones, and they have to be torqued to 75ft lbs, which the tools hold the cams in place again to make this possible. If you dont use these tools, you will seriously damage the valvetrain.
7. Alternator
8. Coolant Temperature Sensor

All that done, install it, plug it in, and start it up. Good luck.

[How-To]

Discussion Here:

Convert a 2002-2004 3.5HO Engine to Work in a 1998-2001 (Discussion)