2008 hummer h3 3.7 swap engine to 5.7
Super Moderator
Joined: Jul 2007
Posts: 13,093
From: Boat Town USA MI
Here no need for this all explanation thell mount ur engine and trans then theyll hook the harness and leave the original one also will hook it for all electic stuff and it works plus the 5.7 vortec with all the wire and mounting for 400$ kinda cheap plus the meqanique will take 300$ just for swapping not electeicity he will give u the H3 woeks without electeicity cheap ahhh
Two words: Oil Pan.
Senior Member
Joined: Aug 2010
Posts: 138
It would take a ridiculous sum of money to get an LT based engine into a space designed for an LS engine. Most likely your front end would be overloaded by the time you were done. A 5.7L is a heavy engine, go for a 5.3, or 6.2L both much lighter.
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Junior Member
Joined: Feb 2020
Posts: 5
Ok 5.3 or 6.2 got it thxx if before i start found it will cost more than i expected ill go for rear diff lock and infront ill put ARB lock and some hp tuning with 35 wheels
by the way how can i lift my h3 i couldnt find any lift kit except the shakles and torsion bar the h3 is not like the wrangler where u can load alot od mods in it
by the way how can i lift my h3 i couldnt find any lift kit except the shakles and torsion bar the h3 is not like the wrangler where u can load alot od mods in it
Super Moderator
Joined: Jul 2007
Posts: 13,093
From: Boat Town USA MI
H3s are not Wranglers. All an H3 needs is tires, UPC, Rock Rails and a T Bar adjustment to bring the front up to 23.5" fender lip to hub center. You do NOT need to buy any "leveling kit", the stock T bars can get you all the 3 can handle. With the above, and a bit of H3 driver experience, the H3 can wheel the bajezzus out of damn near everything.
Like the Rabbit says: lift kits are for kids.
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