Aleromod.com - View Single Post - what is all needed for the lx9 upper/lower

Starglow · 09-23-2013, 07:41 AM

Given the amount of work involved, doing a 3500 UIM swap only isn't going to benefit anything without doing the 3500 heads and LIM swap as well.

You would need an adapter harness for the 3500 MAP sensor and the 3500 fuel injectors are not compatible as the fuel rail system is completely different from a 3400 and does not have a FPR. You have to use the 3400 MAF as well as the TB since the 3500 TB is electronically controlled unlike the 3400.

Regarding reusing the gaskets, I know opinions may vary on this, but I wouldn't do it because once the seals have been compressed under torque there's no guarantee they'll seal properly the second time around. Do you really want to risk having to do another tear down because you didn't replace the LIM gaskets and they leak?

09-23-2013, 07:41 AM	#2
Starglow GX Member Join Date: Mar 2012 Location: North Carolina Posts: 179	Given the amount of work involved, doing a 3500 UIM swap only isn't going to benefit anything without doing the 3500 heads and LIM swap as well. You would need an adapter harness for the 3500 MAP sensor and the 3500 fuel injectors are not compatible as the fuel rail system is completely different from a 3400 and does not have a FPR. You have to use the 3400 MAF as well as the TB since the 3500 TB is electronically controlled unlike the 3400. Regarding reusing the gaskets, I know opinions may vary on this, but I wouldn't do it because once the seals have been compressed under torque there's no guarantee they'll seal properly the second time around. Do you really want to risk having to do another tear down because you didn't replace the LIM gaskets and they leak? __________________ 1999 Pontiac Grand AM SE - 3500 Swap Last edited by Starglow : 09-23-2013 at 09:23 AM.