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Post by john442 on Feb 10, 2017 22:40:29 GMT -5
I have a concern about whether or not the stock non posi is strong enough with my 455 and 4 speed. I don't
plan on doing hole shots but would like to run it through the gears from a roll. I'm pretty sure the gears are
high two or very close to three. The driveshaft turned almost three times by turning one wheel twice.
The car has really great response when I do step into it without going full bore!
Thanks in advance for any input and opinions.
john
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Post by BR[] on Feb 12, 2017 9:23:24 GMT -5
The easiest thing to do is pull the pan off of the rearend and find out exactly what you have in there. It should be a 3:23 posi, but not always. So once you've figured that out, if they are 3:23's or 3"08's you'll need to get a set of 3:55's (good down the highway) or 3:73's (a little deeper) The 3:55's in a 3 series rearend are what Olds installed as stock unless you ordered 3:90's (4 series rearend) That rearend allowed for 4:10's, 4:33's or 4:56's (great for fun, not so good for cruising) In the 60's I ran nothing, but 4:33', but that was for street racing. So with all of that said, the 10 bolt should be fine for everything that you want to do. I have pounded mine out of the hole with no problems, but you have to keep in mind these parts are over 50 years old, so I wouldn't go too crazy. With the rolling start you mentioned, I wouldn't worry about it. If it turns out to be a non-posi, I'de have to dump it for a posi, otherwise you'll smoke the one tire to death.
Determining Gear Ratio
You will have to put the rear up on jackstands, put the transmission in neutral. Make sure that the car is quite stable, get under the car, and TURN THE DRIVESHAFT. Count the number of turns of the driveshaft it takes to turn one wheel one time. If you turn a wheel, instead of turning the driveshaft, you will only turn the other wheel (not the driveshaft).
It also works better (more accurate) if you turn the driveshaft enough times to turn one wheel ten times, and count the number of times you turn the driveshaft. This is because it may be difficult to tell if the driveshaft goes around, say, 2.56 or 2.78 times for one turn of a tire. But if you turn the driveshaft enough times to turn a wheel ten times, you will have 25.6, or 27.8, or 41.1 (or whatever) turns of the driveshaft. Then just divide by ten to get the ratio of the rear.
Note also that there are two different ring gear carriers, one for 3-series ratio gears and one for 4-series gears. The difference is the dimension from the ring gear mounting flange to the pinion centerline, due to the larger diameter pinion required for the lower numerical gear ratios. A set of 4-series gears can be installed in the 3-series carrier with a spacer and longer bolts (not desireable due to reduced strength), but the reverse is not true.
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