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I have a 2.73 rear behind my small block and 700R4, and I can tell I need more. I do get about 24 mpg cruising on the highway, but I have been planning to upgrade to a mid-3 series gear as well. 3.31 is a 20% increase for me and was likely what I was thinking of as this get very close to the "optimal" factor I have seen where they say divide 10 by first gear ratio and you have a good rear ratio (10/3.06=3.27). But with the large step between first (3.06) and second (1.63) on the 700R4, it might be better to go to the high end of the scale: 3.06*2.73= 8.35 3.06*3.31=10.13 3.06*3.55=10.86 3.06*3.73=11.41 3.06*4.11=12.58 Also, I assume I need a new carrier. I thought that the 12 bolt mid range carrier took 3.07 to 3.90 gears, but I have also seen it listed as 3.73 and below, and 3.73 and up, so there seems to be confusion out there... Brad Waller '66 Convertible | 327/dead | 4-speed | Wilwood Brakes | 245/45/16 BFGs '67 Chevelle | ex-SS396 | 355/700R4 | '79 F-Body Brakes > -----Original Message----- > From: Clint Hooper > Subject: Re: [Chevelle-List] Rear End Ratios > > Yes,you will need a new carrier,Rick. That's probably the > main reason I > never switched to 3.55's. > Clint Hooper > LT5 Registry > Wichita Falls,Tx > (940) 855-6636 anytime > '90 ZR-1 Red/Red #952 > TX TAGS: USA ZR1 > http://www.LT5Registry.com/ > ----- Original Message ----- > From: richard a schaefer <[EMAIL PROTECTED]> > > > > I agree with Clint. Behind the torque of a big block 3.31 > or 3.55 will > > work nicely, especially with an OD. I have a s/b with > 700r4 and 3.31, > > my seat of the pants feeling is for my combo 3.55 would be better. > > Question though, if you drop lower than the 3.73, will you > need a new > > carrier? > > > > rick schaefer > > http://members.home.net/jimmy4/rick1972elky.html > > http://chevelles.com/showroom/ricks%20motor%20-L > > > > ----------------------------------------------------- > To Unsubscribe please visit www.chevelles.net/list.html > To start a new topic, send mail to: [EMAIL PROTECTED] > ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
