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I tested the battery at 12.2 when off and 14.4 when on same with the alternator.

well folks my 3500 Lx9 swap into a 2000 buick century is done n runs great n very fast

has anybody done the 3500 swap into their 3100 wbody (1st gen). I was looking at the mms website and they have a kit for everything you need to swap a 3500 in, has anybody used this and how difficult was it?

I've used a 97 lumina pcm in my 96 GP before. 2nd gear start wont work. Later it ran my LG8. Swapping a 3500 requires some custom work. Things that come to mind: * Throttle body: Downgrade to a 3400 56mm is easiest * External 7x trigger * EGR adapter/block plate * Install 3x00 timing cover for 24x * Install 3100 lower mount on oil pan * Install 3100 driver side dogbone mount * Forgo or customize passenger side mount * Use 3100 exhaust for correct downpipe or custom * Use 3100 alternator/bracket * Install 3100 power steering pump * Use 3100 harness and cut/wire the injectors and coolant temp sensor * Remove oil filter neck and screw oil filter to block * I don't recall if a 3x00 fuel rail fits under a 3500 UIM, if not use 2000+ 3x00 fuel rail with 3400 upper intake, or modify fuel system to be returnless * Install 3100 knock sensors (there's a spot for them) * Don't think the AC is interchangeable so ensure window motors are good

3400 is the easiest swap. You can run it on your 3100PCM. ?

crank trigger makes only the 7X signal that the ICM needs to make the 3X signal sent to the PCM in almost every 87ish-05ish 60V6 application. the 24X reluctors would normally be on the damper, which IIRC, is where the 7X crank trigger goes. the most foolproof option that i can think of would be to disassemble the engine, pull the crank and have the internal reluctor wheel of the 3500 removed, have a 2.8/3.1/3.4/3100/3400 one pressed on, and then run a 3100/3400 damper with the 24X reluctor in it, to give the PCM both signals it wants to see.

So, if someone were wanting to swap an LX9 into a first gen, OBDI w-body, what all is needed to do the swap? Does it matter if it was pulled from say, an '06 G6? What would I do about motor mounts, dog bones and the lower mount? Is there an ECM/chip combination that this would run best on, without going through the trouble of swapping the whole car to OBDII?

I know it seems daunting... but the 3500 swap was just a little more difficult than when I swapped in a LP 3100.

I was hoping to find something that drops in without a ton of work, and is similar in power output to the LQ1, that's why I'm considering the LA1 and the LX9.

The 3500 had better flow from the heads up. Also a crank scraper and some oil jets on the pistons. A 3400/3500 hybrid is a popular swap too. Using a 3400 bottom and a 3500 top is will keep you from buying an external trigger and installing the 3400 crank pulley with it's 50something x sensor. Or you could do a megasquirt:thumbsup: