1. Look at what your options are, finding a low milage 3.7 might be hard.1. Am I better off buying a used 2007 3.7 or should I find a reman long block?
2. 3.5 mani bolt up as is or do I need to port it to fit? Would the 3.7 manifold be a better choice?
3. I've read the fuel rail from the 3.5 needs to be used...which injectors (3.5 or 3.7)?
4. Does it matter if the used 3.7 comes from a 4x4 (my truck is four wheel drive)?
5. If I bought a long block, wouldn't I need to reuse the coils from the 3.5?
Thanks for the help.
1. Reman is safer, but the head problems are less common on the 3.7L so I wouldn't rule out a used as long as the price is right.My 2006 3.5 with only 80,000 has a bad head. It's 8 months out of warranty and GM is not willing to help me out with it. It seems a 3.7 swap is going to be the cheapest fix. I've read through the threads and still have a couple questions for the forum.
1. Am I better off buying a used 2007 3.7 or should I find a reman long block?
2. 3.5 mani bolt up as is or do I need to port it to fit? Would the 3.7 manifold be a better choice?
3. I've read the fuel rail from the 3.5 needs to be used...which injectors (3.5 or 3.7)?
4. Does it matter if the used 3.7 comes from a 4x4 (my truck is four wheel drive)?
5. If I bought a long block, wouldn't I need to reuse the coils from the 3.5?
Thanks for the help.
Wait a tic...are you saying I don't need to swap the fuel rail? The 06 is the same? I hope so...this just got a bunch easier. So basically the egr block off plate needs swapped and I'm home free?1. Reman is safer, but the head problems are less common on the 3.7L so I wouldn't rule out a used as long as the price is right.
2. 3.5L mani will bolt up but port matching is recommended
3. Since you have a 2006 with a returnless system you don't have to worry about getting the fuel rail.
4. the 4x4 and 2wd are the same only the transmission pans are different, so no issues there.
5.You cant use the 3.5L coils on the 3.7L head so you will need 3.7L coils
let us know if you have anymore questions
2
... That round thing to the left is the fuel pressure regulator
Either way...just looked and mine doesn't have it, I am good to go with the rail on a 2007 3.7. Can't thank you guys enough for the help.Not sure (mine is an '05 with the return-style system) but..
I believe that thing is a fuel pressure sensor.
As I understand the later return-less systems, the control circuit located in the rear under the chassis is the regulator.
The sensor mounted up front measures the pressure and returns a measurement signal to the control-unit.
The control-unit then varies the speed of the pump motor to increase the pressure (by running the motor faster) or decrease the (by running slower) to maintain fuel at the correct pressure.
I could be mistaken, but that's my understanding.
The 4x4 pans are deeper, I had to change mine. My motor came out of a Z71 and couldn't use the pan or pick up tube for the oil pump.1. Reman is safer, but the head problems are less common on the 3.7L so I wouldn't rule out a used as long as the price is right.
2. 3.5L mani will bolt up but port matching is recommended
3. Since you have a 2006 with a returnless system you don't have to worry about getting the fuel rail.
4. the 4x4 and 2wd are the same only the transmission pans are different, so no issues there.
5.You cant use the 3.5L coils on the 3.7L head so you will need 3.7L coils
let us know if you have anymore questions
My bad I thought there wasnt a difference. Still no biggie since he will have his old motor to pull the parts off.The 4x4 pans are deeper, I had to change mine. My motor came out of a Z71 and couldn't use the pan or pick up tube for the oil pump.
I saw that motor in the classifieds. Sounds interesting, but I'm really looking for something I can get in hand and have it in ASAP. Swapping the motor is within my realm but dual overhead cams and timing sets are not. Appreciate the offer sir.I have a rebuilt 3.7 with a 2wd pan for sale in the classifieds. Been bored .02 over. The head has around 40k on it. It will be shipped complete besides the timing set.
I'd imagine nothing aside from swapping your 4x4 pan onto the 3.7 if it is not out of a 4x4 originally. But I could be wrong.Another question for you folks. What will I need to do differently since mine is a 4x4? Can't seem to find a 3.7 swap write-up on a 4wd truck around here....
