Actual overdrive gain - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10stepside · 11-21-2013, 12:23 AM

Hey guys, any of you do an od swap? What was the actual before and after mpg gains? Put this one here to get a more accurate number,being we all have 67-72. Really asking because my turbo400 is starting to slip bad going into second. And would like t56 or 2004r,but would REALLY like to put a m20 Muncie back in it like it once had when dad had it. I understand the m20 is the wide ratio and blah blah. What was your true number gains? How long will it take for that extra cash to pay off? Lol I do have a 4.11 right now with a very happy 355. With the turbo 400 I CAN get 13-15 mpg driving back roads. With my motor, I think its impressvive. Anyone able to answer this?

11-21-2013, 12:23 AM	#1
70c10stepside Registered User Join Date: Jun 2011 Location: Taylorsville, Georgia Posts: 482	Actual overdrive gain Hey guys, any of you do an od swap? What was the actual before and after mpg gains? Put this one here to get a more accurate number,being we all have 67-72. Really asking because my turbo400 is starting to slip bad going into second. And would like t56 or 2004r,but would REALLY like to put a m20 Muncie back in it like it once had when dad had it. I understand the m20 is the wide ratio and blah blah. What was your true number gains? How long will it take for that extra cash to pay off? Lol I do have a 4.11 right now with a very happy 355. With the turbo 400 I CAN get 13-15 mpg driving back roads. With my motor, I think its impressvive. Anyone able to answer this?



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