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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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.

Thank you

There is one positive vote for the old school rearend.

B

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..

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..

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

You might want to look into a higher ratio like 4.33, 4.56, 4.88.

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

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.

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.