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Re: new engines for the GMCs [message #316593 is a reply to message #316589] Tue, 25 April 2017 11:45 Go to previous messageGo to previous message
A Hamilto is currently offline  A Hamilto   United States
Messages: 4508
Registered: April 2011
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Senior Member
TR 1 wrote on Tue, 25 April 2017 09:33
Mike, I'm sorry if I came off as saying you were not capable of doing the swap. That was not my intention. My point in listing all that stuff out was to illustrate the point that engine swaps are a lot of work... And that the 455 and Cad 500 really are good motors for our application. You are 100% right, at some point we will NEED a new engine option... I also agree with you that the LS motor is the best gas engine out there right now for the job. But good god, it's a lot of work to get it in there and working, then add all the ancillaries as well...

But you are also correct in saying that the more options we have, the better off we will all be. I'll tell you, if I were going to do an LS swap on the GMC, and I needed to modify the interior anyway, I would probably look the possibility of using a 4L80 to get the extra gear and lockup converter.... I believe Hal's diesel setup uses a 4L80 or similar, and some sort of transfer case to get power back to the front...

Hal, could you maybe describe how your setup works?
IIRC, Hal used the engine/transmission/transfer case because that is what he had on hand (4-speed).

A similar setup with 5 or 6 gear tranny would be better. More gears in the tranny is always better. Continuously variable is ideal, but not many sizes have ever been made, and nothing big enough to drag a GMC class A.

If anyone ever decides to make a drop-in front-wheel-drive engine/tranny combo (with other than the THM-425) 6 speeds should be the goal.
 
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