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I just got my hands on a dream car and it's slowly becoming a nightmare. The mission is to strip it down to the frame and build back up. This will be my first build and I have a million questions???? My biggest question right now is what engine/transmission can I drop in it to achieve 2 things fuel economy and enough horse power to enjoy it as a daily driver??? Any suggestions and advice will be extremely helpful. Thank you and have a good day
 

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2014 ELR
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Truck 4.8/4L60E, driveshaft from a 91-96 D body, 8.5 rear end from a 91-96 D or B. 2.73s or 3.08s (if MPG is the concern). It will be more than double the stock HP, and still get almost 30mpg. Throw a cam in it, and it will be close to triple stock HP.
 

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Truck 4.8/4L60E, driveshaft from a 91-96 D body, 8.5 rear end from a 91-96 D or B. 2.73s or 3.08s (if MPG is the concern). It will be more than double the stock HP, and still get almost 30mpg. Throw a cam in it, and it will be close to triple stock HP.
I never expected such a detailed lay out of a build. Thank you so much. When it comes to this type of stuff there is so many combinations that it gets over whelming and confusing.
 

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lol, there's lots more detail we can go into. Engine mounts, wiring, fuel delivery. LS swaps are very common now, and many have been done in the B/D body platform. You can save a lot of money by using the truck wiring harness/PCM and doing the harness yourself. There are VERY good long videos on this on youtube. You'll need the PCM re-flashed to remove features you're not going to need, and you'll be removing lots of wires from the harness, and re-pinning many circuits.

Of course, a 5.3, 5.7, 6.0 are all the same work. More power, less mileage. The easiest way to get everything you need is to buy a complete vehicle. Truck, suburban, or a van. Vans seem to be the cheapest.
 

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From what years are good models to pull from? Does a 4.8 come with a 4l60 or is that a separate model and year? Have you done this build before and speak from experience or you just know your stuff?
 

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I've pulled a few, worked on a bunch. Haven't done a swap myself, but I know my stuff, lol. Some will have the 4L80E, earlier/light duty will have 4L60E. Besides vans being cheaper: they're RWD. A 4x4 trans is no good to you. You'll be able to find a list of years online, it's on Wikipedia (and lots of other places).

THIS thread on the Impala SS forum will help you a lot with B/D specific items.

And, THIS section over on the truck forum will have lots of good reading.
 

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A 79 Impala:


And, an LS7 (!) into a Caprice wagon. I know this guy, he takes care of vintage race cars in his spare time...


And, our very own Stingroo's LS/T56 wagon:

 
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