Thread: Gears

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I would also go the 3:25s. Back in the day, 3:70s were an okay all-around street gear... but 4:11s or 4:56 would give so much more "dig". :-)

It would also depend if you want to trade away performance, for mileage. Either way I would not run a real tall tire, or it won't be much like a "hot rod".

Roger and Hotrod I`m running a 406, smblk, mild cam, turbo 350.....only because I didnot want to cutup the frame to bad installing a 700 4r, right now its got an eight inch ( second third member in it, heavy foot does that ) with 325 gears with a 29 tall tire.

OK - with 29" tires and a 3.25 (dang few of them as OEM's) will give you an effective ratio of about a 3.00 set of gears. A set of 3.00 gears with those 29" tires will give you about a 2.75 prairie (dog) ratio. I have 9''/3.25's in my roadster and hope to change back to the original 3.70's with my (also) 29" tires come spring as that 5.0L needs a little help. If it was me, probably not be in a hurry to swap out an 8" for that 9" - find a 250 cid Granada with 3.40s or 3.55s and you will be right in the right rpm range (also some Pinto wagons had an 8" diff with the same ratios). I never killed a decent ratio 8", tho I tried - often

I was told to look for a `67 third member carrier, supposedly stronger, having more ouside ribbing and a little thicker area around the pinion support, but I have never seen one as of yet, but I have been looking...