59 Pontiac 9.3 Rearend Will It hold up - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-24-2006, 01:43 PM
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59 Pontiac 9.3 Rearend Will It hold up

I'm New to this site and in the building phase of a drag only Monza. I have a Pontiac 9.3 rearend that has been completely rebuilt with street 4.1 Richmond gears, a spool and MW 35 spline axles. It is the right width and has perfect 4 link brackets. The car will weigh about 2500 lbs, 4500 stall, powerglide, 11.5" X 30 Goodyears and a 406 World Products sbc 550 hp 495 to 507 tq from 4500 to almost 6000. My concern is the street gears. Opinions Please
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Old 03-24-2006, 02:15 PM
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I don't think the Poncho rear will break a sweat behind a 406/glide. I had a 8-3/4" Mopar in a bracket dragster with a 454/glide and it worked fine for years.
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Old 03-24-2006, 03:03 PM
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59 Pontiac Rearend

Thank you

There is one positive vote for the old school rearend.

B
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Old 03-24-2006, 03:59 PM
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With the good axles and spool and having the good three rib pumpkin, I would be more worried about the 4.10 ratio being a little light..
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Old 03-24-2006, 04:12 PM
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In the old days.........

Being the early 60's ........the Pontiac was the rear end of choice for most drag racers.....that were not required to run the stock rear end type.

I know a fellow with a 409 409 HP 62 Bel-Air equipped with a 4 speed and slicks .....he had a Pontiac under it and left the line at 4 and 5 thousand RPMS.....without a problem...for years....

You should not have any problems in a light car with no more engine than that..
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Old 03-24-2006, 04:22 PM
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4.1 ratio being a little lite?

I'm not sure what you mean about lite. I am concerned that the street gears will be the week point. If you think I will need 3.90s I don't know where I can get them. I will have room for a 32" tire though. I really don't know how fast this car will go. I guess about 135 +- at about ten flat. Peak engine hp is at 6300 so I can push it to 6500 with out loosing et. Of course all of this is armchair.

B
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Old 03-24-2006, 04:30 PM
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Quote:
Originally Posted by Quarter Flash
I'm not sure what you mean about lite.. .
. . . If you think I will need 3.90s I don't know where I can get them. . . .

B
You might want to look into a higher ratio like 4.33, 4.56, 4.88.
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Old 03-24-2006, 04:38 PM
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Quote:
Originally Posted by Quarter Flash
My concern is the street gears.

Back then.......everything WAS street gears.....no special hardness / softness drag gears ......

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Old 03-24-2006, 04:42 PM
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Hi, I think your question is not so much the pontiac rear as the richmond street gear, right. I have the street gears in a 3450 camaro, powerglide, ford 9 " transbrake, slicks, runs high 10's. My opinion is in your setup the richmond street gears will hold up ok. If I am on the wrong track, disregard all after Hi.
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Old 03-24-2006, 05:27 PM
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Pontiac rearend

Thank you all for the good information. I think the gest is the gears will most likely hold up. Since it is what I have its a good start. I do have a second third member with 4.88 gears in it if 4.1 are to tall. Watch now 4.56s will be the key.
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