what rear end?

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what rear end?

Post by coreys73chevelle on Wed Sep 17, 2008 7:47 pm

my 10 bolt says CFD on the bottom of the housing and AC B335 on the passanger axle part, what gearing is it?

i turn tire forward a full rotation and the driveshat turns a little over 2 and a half times, guess 2.73???
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Re: what rear end?

Post by BlackChevelleSS on Wed Sep 17, 2008 9:52 pm

AC is 2.73 without posi

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Re: what rear end?

Post by coreys73chevelle on Wed Sep 17, 2008 10:28 pm

ok thanks i thought so
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Re: what rear end?

Post by Hydro King on Wed Sep 17, 2008 10:37 pm

What would a 2.73 gear be usefull for? I have 3.08's and that would be enough why did gm put 2.73's in there?
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Re: what rear end?

Post by jonny o on Thu Sep 18, 2008 7:47 am

4k lb ugly boat of a grandpappy ride, gas crunch, tiny wheezing underpowered engines and primitive 1 to 1 transmissions with overdrive rolling in shortly. 2.73's were the answer to economy and highway cruising without tapping into expensive modifications from the factory.

Great to have a set bagged in the corner of the shop if you decide to take a long road trip!

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Re: what rear end?

Post by Hydro King on Thu Sep 18, 2008 10:13 am

You think they are that ugly tell the guys at ct that.. here is a link
I love my car and it's style, I think old rat rods look like junk along with most chevelle's prior to 73! My car will look awesome.
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Re: what rear end?

Post by jonny o on Thu Sep 18, 2008 10:37 am

I started over there brother.

If you haven't picked up on my attitude yet bro, I'll stop trying to help out.
I meant no offense to you or your ride, and have applauded you for your amazing efforts in the past.

Re read it and reconsider. One word was about the style of our cars. The other 3 lines described what a highway gear was good for and why it's in some of our big cars.

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Re: what rear end?

Post by ant7377 on Thu Sep 18, 2008 5:47 pm

I got them in my 73 454 Monte .That car gets really good mileage gets up and goes resonably well and flies down the highway, it isnt that bad.
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Re: what rear end?

Post by JB2wheeler on Thu Sep 18, 2008 10:31 pm

My engine has around 600 feet of torque. I put 3.43 gears in the place of my 2.73s and kind of regret it. It did not help because I have so much torque but not that many RPMs for my redline. If you have the torque to turn those 2.73s they are fine unless you are strictly a drag racer with a high RPM redline. JB
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Re: what rear end?

Post by Oidar on Fri Sep 26, 2008 7:56 pm

OK, I may have my head up my butt here...

I followed the procedure I found on this Olds site:
http://www.classicoldsmobile.com/tech/69.shtml

It's the same as noted above, but the tire turns 10 times, and you count how many times the driveshaft goes around.

Problem is, for 10 tire revolutions on my car, the driveshaft goes around a little more than 13 & a half. Which is about half of 2.73:1

I know I'm gonna feel dumb, but as we say in the radio biz, WTF, over.
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Re: what rear end?

Post by Hydro King on Fri Sep 26, 2008 10:33 pm

I have 3.08 posi, in my rear end of the chevelle.
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Re: what rear end?

Post by BlackChevelleSS on Sat Sep 27, 2008 3:02 am

If you think its still got the original gears in it then theres a code on the passengers side axle tube. itll tell what gears are in it.

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Re: what rear end?

Post by coreys73chevelle on Thu Dec 04, 2008 1:13 am

pass side tube says AC B335 2
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Re: what rear end?

Post by coreys73chevelle on Thu Dec 04, 2008 1:14 am

i also found this do you think itll mount up ok?
http://seattle.craigslist.org/see/pts/941895475.html
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Re: what rear end?

Post by BlackChevelleSS on Thu Dec 04, 2008 2:46 am

too much trouble. youll have to cut all the brackets off and weld on your own. The 8.5" in your car is great. All you need is a posi and some gears and youll be good. They come with factory bolt in axles so thats something you won't need to worry about. Add an aluminum cover with girdle like the one on hydros and its as stong if not stronger than a 12 bolt.

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Re: what rear end?

Post by JB2wheeler on Thu Dec 04, 2008 11:00 am

Some 10 bolt 8.5s came with even higher (lower numbers) rear gears than the 2.73. there were two center section housings and the 2.73 and lower (higher numbers) will take the bigger gears, but the other way will not take the bigger gears. JB
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Re: what rear end?

Post by BlackChevelleSS on Mon Dec 08, 2008 1:40 am

you said B335 right, ours is K326.... hmm I figured K was november and then it was the 326th day of the year. But then yours wouldnt make sence. B 335. 335th day of the year is December 1st.


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Re: what rear end?

Post by BlackChevelleSS on Mon Dec 08, 2008 11:15 am

Ok I found out what it means,
Corey your B-335
B- Chevrolet G & A - Buffalo, NY
335- 335th day of the year, December 1st

Then our K-326
K- GM of Canada -St Cathrines
326- 326th day of the year, November 21st

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