Gen IV in a Gen III hole ???
Thread Starter
Staging Lane
Joined: May 2025
Posts: 68
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Gen IV in a Gen III hole ??? How hard is a gen IV swap in a 2005 Suburban 4x4 ? Has a L59 (5.3L) in it (blown engine) and would like to put a 6.2L L9H / L92 or a L94... Looking for a donor. But questions about swap. If I get a donor w/ trans and transfer case should I swap all ??? Can I just do engine ? Not sure if mine is 24 reluctor. Do I need to swap all wires and computer ? Will it plug into my tranny ? To add to this I'd be adding headers, cam too... So if you've done something similar please let me know what I'd need as I've heard 05's are a mix... can be part gen III and IV or full IVs (at least as far as wires and computers are concerned.
Thread Starter
Staging Lane
Joined: May 2025
Posts: 68
Likes: 17
will the new computer and wires hook up and everything else work or need to cut n spice or adapters to get things like 4x4, trac contol, abs breaks etc. working???
TECH Regular
Joined: Dec 2022
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If you are trying to keep all the factory things working together happily the easiest thing you can do is put the crank trigger from the older engine onto the crank in the newer one and swap the cam gear to a 1x.
11 Second Club
Joined: Mar 2012
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From: fbg, tx
I built an ls3 for my 98 camaro, had the 24x reluctor wheel installed, did the wire extensions for the cam sensor, did the knock sensors extended and added to side of block. Its not that bad of a deal if youre knowledgeable.
You can use a Lingenfelter 58x-24x conversion box to handle the different crank reluctor wheel. Then you need a couple extension harnesses for like the cam sensor and the knock sensors and possibly have to get an adapter to run your stock throttle body on the 6.2 intake or there are a couple different ways to make the newer drive by wire tb work with your older harness and ECU.. Then you just tune the stock ECU just like it was a gen 3 engine.
As for the transmission, the 6.2 will come with a 6L80 which your stock ECU can't control. You will need a separate control module to run it or you can put whatever trans you have in the truck now behind the 6.2 with a little mechanical work and then use the stock computer for it.
It takes careful planning and some conversion bits and bobs but it can be done.
As for the transmission, the 6.2 will come with a 6L80 which your stock ECU can't control. You will need a separate control module to run it or you can put whatever trans you have in the truck now behind the 6.2 with a little mechanical work and then use the stock computer for it.
It takes careful planning and some conversion bits and bobs but it can be done.
