StrayDog

My 66 BB turns 13.3 in the 1/4 mile with 308 rear gears, finally decided to put in 373s (please dont suggest 411) my Vette is for cruising ......the 308 rear = 80 MPH(my cruising speed) @ 3,000 rpm, with 26 " tires, Question what rpm is 70 mph ( new cruising speed) 373 ??. figure thet driving my old vette is fun & the 373 will be xtra fun.......... :seeya anybody out ther want to swap 308 for 373 carriers ??? :auto: :seeya :auto: :confused:

396 RAT

So you finally caved in!
:beatdeadhorse:

You will never look back.
Instant 12's or?
Almost forgot. http://www.quiknet.com/~ke6vut/rpmcalc.html
:party:





[Modified by 396 RAT, 7:46 AM 5/11/2004]

StrayDog

Who to get complete 373 carrier from, in exchange for my 308 ??????????????????? :seeya

67beast

Straydog,
You will be at about 3000 rpms at 70. 75 will be up around 3500 rpms. I have 3.73s and a cruise for an hour or two at those speeds is certainly tolerable. But the low end is great! Good luck.



[Modified by 67beast, 9:30 AM 5/11/2004]

66427-450

Good for you !

26" tires, 3.70's..... 3000 revs = 62MPH. the very short tires make a significant difference (almost as good as 4.11's with std heigth tires :)





[Modified by 66427-450, 9:58 AM 5/11/2004]

66427-450

I hear "427hotrod" has one for sale. it may be hard to find someone that would want your old 3.08 rear.

Have you considered just changing out your 3.08 gears for 3.70's??? that's what i'd do (but i'd install 3.90's :lol: ), and freshen up your posi unit while it's out, ............add bearings and seals and your 100% fresh.

6T5RUSH

StayDog,

Boy, are you going to increase the fun factor running around town (and at the strip). I took nearly a 1/2 second off my quarter miles times swapping out a 3.36:1 OPEN rear (still have her) to a 3.70:1 Posi. :jester Down the road I may want to convert that OPEN 3.36:1 to a Posi and freshen her up in the process.

Keep us posted on your swap and results.

Jim

StrayDog

WOW!!!! if thats the case I can look at 12.8 ET (13.3 best prior) switching from 308 to 3.73 :party: why have I stuck with station wagon 308s so long ( old age) :beatdeadhorse: :auto: :auto: :hurray: :auto: :hurray: :auto: :steering: :thumbs: :flag

66427-450

now all we need to do is talk you into installing a serious/performace camshaft :yesnod:

427Hotrod

You know what happens when you cross over to the "dark side"!!!!


He he he....Love it!!!


I have a 3.70 diff for sale if you're interested. It's for a '66 427 car. No axles though. Let me know...


JIM

StrayDog

427Hotrod...hummmm >>>>>>>>> tel me more.........is it already to bolt in ????? :confused: lets talk.............the Dog :seeya :flag

Stinger66

I may be wrong here, but when I replaced my 3:36:1 ring and pinion for a set of 3:73:1 I did'nt need a different carrier. I was told if I had jumped up to 4:11:1 then I would need the different carrier...I'm sure someone will chime in to straighten it out.
That gear ratio is fine around town, but isnt much for highway cruizing with a 4 speed. Needs that 5th gear or overdrive.
But the camshaft profile dictated that I stop lugging it and use at least the 3:73:1...Mid to low 12's is the norm now. Good Luck Drive it like ya stole it.
:steering:

66427-450

with a 3 series posi unit you can install up to 3.90's, 4.11's and up, take the 4 series posi units. that being said, I wouldn't be suprised if someone is making a 4.11 gear set nowdays that will fit the 3 series case.

johnoblizlo

How do you identify what gear ratio and carrier series you have? I am almost certain I have 411's in my 67' but would like to take it down to 3:73 or 3:7. It would be nice to keep up with the semis on the freeway.