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Old 07-03-2002, 05:39 AM
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Question Basic 10 bolt question

I have a 10 bolt from a mid 70's Cutlass. It is not posi. I would like to put a posi chuck in it. From reading another post, I have some basic questions.
a) How do you know what splines you have? Is the only way to take the cover off and count them?
b) Considering you have the same amount of splines, do you need to change axles? Is it better to do so?
c) How do you determine what gear ratio the new chuck is? (3:90's, 4:11's, etc)
d) For basic cruisin and highway use, what is a good gear ratio with a 455 Olds? I am not a drag racer
Folks, I have never done anything in this area. Any help wold be appreciated. Oops, almost forgot. In buying used, is there anything I should be aware of or look for to determine good from crap? <img src="confused.gif" border="0">

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Old 07-03-2002, 05:27 PM
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a) gm made 28 spline till 89 or so ( my # may be off, i'm drinkin beer!) post or e mail, with year and i'll find out on the spline count.
b) no, you don't have to change axle shafts.
c) pull the cover and on the ring gear there should be #'s, like 11- 41. divede, that will give you a ratio.
or, count the # of teeth on each gear, then divide.
see the post " rearends"
if your 455 is puttin out, a10 bolt will hold up for a while, but..........
you can't count on used parts to hold up, a new posi unit isn't that expensive, auburn makes a goog one.

[ July 03, 2002: Message edited by: axle bastard ]</p>
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Old 07-03-2002, 10:29 PM
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if your not drag racing a 373 gear is a good all around gear for street and hwy use
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Old 07-04-2002, 07:57 AM
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Great! Thanx guys. Axle B, I thought I might see your voice. I'm going to the shop in a couple of minutes and will find out the info and send you an e-mail.
Mojo69 You confirmed my guess. I knew 4-11 would be to tall, but I have never played around with rearends. (God, is that an open Line )
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Old 07-04-2002, 10:16 AM
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Madd Syntst,

I just went through this in the last week. After searching for months for answers I called "Reider Racing" at 734-946-1330. I spoke with a technician and he walked me through determining exactly what parts I needed. Also, They sell Eaton Posi units for $335.00 when places like Summit are asking $450+. The parts arrived the next day at my house.
I had the gears installed in my GM 10 bolt yesterday. The best recommendations I received for street use were 3:55 or 3:73. A shop installed my posi & 3:73 gears yesterday for $250 and it really makes a difference !! According to the Tech at Reider Racing the nearly universal Rear end used 73 - 77 A - Body GMs were 8.5 inch 10 Bolts. Hope this helps

Bigjoedo
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Old 07-04-2002, 03:01 PM
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Cool

Please stop those calls, we have a winner. Is this not the best thing on the web. Big Jodo, you get a gold star. Thank you for your timely intell. I believe you get what you pay for and I was leary of a junker rear end chuck. I have someone who will do a job swap for the gears installation. This doesn't seem like a lot of money to go for brandy new!
Thanx, today, U.D.MAN, man
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Old 07-08-2002, 06:46 PM
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just in case. gm made 28 spline till some where along in 89, then went to 30 spline.
i am sure this is not the rule, just very common.

[ July 08, 2002: Message edited by: axle bastard ]</p>
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