would a 4.3 get better MPH? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

iluvmy72 · 09-25-2005, 01:19 PM

I'm nto going to be doing any hauling with my truck. Should I put in the 4.3/700r4 combo if I want better milage? Right now I have a Olds rocket 350 with a TH350....I'm gett'n 8 MPG. The 4.3 has a new throttle body kit installed with new injectors.

Longhorn Man · 09-25-2005, 01:22 PM

Asuming you have a 3.73 gear, if you tried, I would guess that you'd get MAYBE 16 MPG at best.
In all reality, i would figure your MPG would go up to 12 or so on normal daily driving.
It would be TOTALLY gutless compaired to what you are used to, and it would be a bit of work to do the instalation too.

09-25-2005, 01:19 PM	#1
iluvmy72 Registered User Join Date: Jan 2002 Location: Springville, UT, USA Posts: 1,010	would a 4.3 get better MPH? I'm nto going to be doing any hauling with my truck. Should I put in the 4.3/700r4 combo if I want better milage? Right now I have a Olds rocket 350 with a TH350....I'm gett'n 8 MPG. The 4.3 has a new throttle body kit installed with new injectors.

09-25-2005, 01:22 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Asuming you have a 3.73 gear, if you tried, I would guess that you'd get MAYBE 16 MPG at best. In all reality, i would figure your MPG would go up to 12 or so on normal daily driving. It would be TOTALLY gutless compaired to what you are used to, and it would be a bit of work to do the instalation too.



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