Suburbans

[Nmbr1GMfan]

Late model cylinder head design just gives better mileage and performance.

[Paul Whalen]

6.0 ls, maybe twins Look for a 4le80.

[squirrel]

I won a GV overdrive, so I'm not really interested in a 4L80E. I'll look around for a 6.0

[Paul Whalen]

I forgot about that! Also look for a 5.3 out of the Trailblazer/Bravada/Saab suv. some have the aluminum 5.3 save some wt lol.

[MR P-BODY]

I won a GV overdrive, so I'm not really interested in a 4L80E. I'll look around for a 6.0

The LS with a turbo and your trans and the GV OD.. with EFI
and you can get the ET and the MPG on the road.. thats a simple
build.... most likely will need the 4.10 gear or so to get that tank
rolling... your talking what like 4000#+ with you in it... the LS with
turbo might be a touch less weight than your BB in there... just a
guess on the weight

[squirrel]

The suburban has an iron 350 in it now. 3880 without me in it, a tad over 4k with.

[MR P-BODY]

The suburban has an iron 350 in it now. 3880 without me in it, a tad over 4k with.

Thats what I figured... your gonna need some gear to get that
weight rolling.. thats no big deal with OD.. I run a Mopar and
I with with the 518 mopar trans with OD.. its .68 OD... this trans
is 40# less than if I went with a 727 and a GV... plus the trans
was $200 and another $200 for the rebuild kit and I changed over
the front pump and input shaft so I could run a high stall conv..it
doesnt have lock up anymore but thats what I had to do if I wanted
a high stall conv... with my set up and 295/55 tires and a 4.10 gear
in a 9", 5000 stall conv.. I can cruise at 75 MPH and am running 2900
rpm in OD... I'm changing over to the Holley multi port EFI right now
(should be done in a few days) so I dont know what my mileage will
be yet but I should know soon

[tsanchez]

Duramax

[BlueCuda340]

Can you use the GV as an underdrive to get it moving then switch it back down track?

[tsanchez]

If not diesel (cool for the tow rig) then I would do a 6.0 truck ls engine and turbo

[Russell]

Can you use the GV as an underdrive to get it moving then switch it back down track?

No you can not b/c as cool as GV is and as much as I want one it is NOT and underdrive. It is a two speed 1:1 and an OVERDRIVE. I am guessing thats the marketing department not the engineering department that calls it an underdrive.

[tsanchez]

On another note though, the 6.0 overdrive in my 3/4 ton 2001 hd gets about 13mpg empty so that 18-20 mark you want may be difficult

[Beagle]

On another note though, the 6.0 overdrive in my 3/4 ton 2001 hd gets about 13mpg empty so that 18-20 mark you want may be difficult

That's where the 290 whatever it is in CID 4.8 shines, hairdryer takes up the slack in the power department. 15 PSI should get you enough HP to be in the 11's. A 6.0 or 6.2 is overkill with a turbo for the target HP.

the 300" F150 six cylinders at about the same weight, just shy of two tons, do pretty well. 20mpg isn't unheard of from them... 500-600 hp is pretty rare, but not 20 mpg. lol.

[tsanchez]

We have a suburban 5.3 also and its gets about the same

[squirrel]

The 5.3 pickup we had got 19-20 regularly.