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08-14-2011, 10:27 AM | #21 |
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Re: 1957 150
I would think the rear could live " beefed" for an automatic...Of course the 12-bolt would be stronger...and has a better list of parts available. But if you're "gung-ho" on "flogging" that 10-bolt...you'd have to work around some disadvantages...One is I don't think anybody made "Pro" Gears for this application EVER...so I would suggest "prepping" the available gear sets as best you can...de-burring, heat-treating, or whatever "current" metal process is suggested for stress-relieving today. Another problem with the "old" gears is ratio selection is a bit weak as they jump from 5.57 to 6.17 while the 12-bolt has 5.57/5.86/6.00, and 6.14 ratios...a better selection to "fine-tune" your combo with. Yes, the pinion is small on the 10-bolt 6.17 ring & pinion as mentioned before...a definate liability! BUT your combo might not require such a "stout" ratio depending on what you will run for tire size, trans ratio, etc....Another problem with the early rear end is I don't think anybody made a SPOOL for it although it could be "custom-made"...check out "Aubrey's " site the guy in Canada with the 409 car. I think he's running the 10-bolt in that car still....although a LOT of work to make it live. The GM "Arma-Steel" posi unit is pretty strong BUT needs help with NEW heat-treated FINE-SPLINED spider gears (for the custom axles), and other mods. Unless you have one of these NOW, they could be a bit pricey at swap meets today...I would also consider steel differential carrier "caps" (or reinforcing straps for the stock caps), larger grade-8 bolts, etc. All of these mods were pretty much "standard-issue" for racers running this rear-end back in the day...although today's horsepower levels, better tires, and better track prep should be factored in the decision...I would try and contact Aubrey...or maybe Tom's Differentials for more input on your situation....Good Luck!
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08-14-2011, 11:00 AM | #22 |
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Re: 1957 150
Use 12 blt. only GM you can get pro gear for,sure you could probaly modify old 10 bolt stump to work,but would cost more than 12 bolt by time you custom made what you would need.
Allan was 3,08,2.10 to 1.1 what you meant to put on ratios? Can a 2.10 to 1.1 gear change be made without killing engine? Did you say Granny shift jokes? If your Granny is offended by the term"Granny Shift",You might be a stick racer. Please don't tell me you Granny shifted,even us KY. hillbilly's don't do that.it's a disgrace to stick racers everywhere,if I had witnessed such a unethical thing I would have ripped your shifter out with my bare hands.LOL just joking around but seriously don't ley it happen againLOL Mike Taylor3601 |
08-14-2011, 01:45 PM | #23 | |
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Re: 1957 150
Quote:
Mike,I think you are right the transmission 2-3 drop from 2.10 to 1.1 would probably be too steep. Way back I had 2.86/1.71/1 and it was bad enough. Some guys used to underdrive third gear but I had no choice. Unfortunately the granny shifting was no joke. I heard it myself on video. I was not letting my foot off the gas either but it was very noticeable in the 1-2 shift. So after the good natured jokes and advice the pro-shifted toploader w/ super shifter is gone and the Jerico w/ Long shifter is in.Can't wait to try it. But if that type of shifting behavior persists I may have to let someone else drive. Allan Last edited by 55 Chevy; 08-14-2011 at 01:46 PM. Reason: spelling |
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08-14-2011, 03:05 PM | #24 |
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Re: 1957 150
Softer "modern" clutch set-up may help extend rear-end life in 10-bolt over what your brother experienced...but if he builds stick car...ONLY a 12-bolt should be used in the '57.
Your brother should have used a Dana in the conditions you mentioned! IMHO...the '57 150 being not that heavy, and the smaller carb(s) limiting rpm a bit (depending on which combo he ends up with ), the gear ratio wouldn't have to be that "steep", and tire diameter/gear would be sorted out in testing. If considering to keep the car original and running AUTO TRANS, I still think the early 10-bolt has a chance but to be practical...you'd have to be able to do most of the work yourself . Mike T. makes some good points too..... |
08-14-2011, 04:18 PM | #25 | |
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Re: 1957 150
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08-14-2011, 05:59 PM | #26 | |
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Re: 1957 150
Quote:
The gear ratio in my combination which is the 265 single four barrel needs to be no less than 6.20 with some apparently running as low as 7.17. Allan |
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08-14-2011, 11:54 PM | #27 | |
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Re: 1957 150
Quote:
Buick had a very similar transmission called "Triple Turbine Dynaflow," during the same period of time.
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Bill Last edited by bill dedman; 08-15-2011 at 12:50 PM. |
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07-14-2013, 02:44 PM | #28 |
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Re: 1957 150
M68
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07-17-2013, 11:39 PM | #29 |
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Re: 1957 150
I raced my '57 J/S car for a few seasons. one time I pulled the rockets out of the hood, and made a full sheet of aluuuuminuuuum to go from fender to fender and rad. to firewall, with only a hole over the carb. got by for a while till someone, at the big end noticed how the hood 'puffed' up. must have really packed the air in. funny at the time.
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07-18-2013, 09:30 AM | #30 |
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Re: 1957 150
My first race car was a '57 150 business coupe with a 283 two barrel. Raced it one year before they outlawed the 4-speeds. The trick of the day for the rear end was to use MoPar side gears in the positraction case and modified MoPar 30 spline axles from 8 3/4 rears. That stopped the axle twisting for me. SS&DI had an article about it.
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