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#1
12-07-2019, 01:14 PM
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Quick Change rears
I have seen that these quick change rears are starting to be used under traditional muscle cars not just old Ford hot rods. Just the other week I saw a 70-73 Challenger with one on the motor trend channel.
There seems to be some aftermarket support for these rears, so.... My question is what are the pros and cons to using these types of rears besides the noise from the straight cut gears. Sent from my SM-N975U using Tapatalk
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87 GP le 455 200r4 3.42 rear |
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#2
12-07-2019, 01:25 PM
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My machinist has had one in his street racer 68 Camaro with a BBC for 30 years and has hammered on it. Mainly circle track guys using them as well as street rods.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#3
12-07-2019, 01:38 PM
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They used to be a little iffy when you got over 650-700 HP with slicks on asphalt, because on dirt the tires spin and relieve some of the stress. The latest offerings have been made stronger as the HP has gotten over 900HP on sprint cars and late model stock cars, even with the tire slippage the older stuff was about at the edge of it's engineering strength.
Most every used unit is going to have a spool in it, probably not really suitable for street duty. Posi units are available, but not cheap. I've seen used axles as cheap as $2-300, but buyer beware as the cars they came out of are run as a contact sport, and can be tweaked from an accident. There are helical cut QC gears that are claimed to be somewhat quieter than the straight cut ones, of course they cost more too. Halibrand and Winters make the helical cut gears.
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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#4
12-09-2019, 06:55 PM
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I run quick changes in my early Fords.
 All Pontiac powered, of course.  As for the pros, you can change your rear gearset in a matter of a few minutes to practically anything you want. The cons are cost and the possibility of pinion support failure with huge power and lots of traction. There is lots to know if you are going to put one under your car, but there is plenty of information out there. Good luck, -Abone.
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Daily Driver Model A Ford. 389 Pontiac w/6-71. 10.80 @129.5 1933, 1934, 1936 and 1940 Fords, also Pontiac powered. |
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#5
12-09-2019, 07:01 PM
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Here is what they look like apart.
 They are super simple to set up.   Pontiac powered, of course.  -Abone.
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Daily Driver Model A Ford. 389 Pontiac w/6-71. 10.80 @129.5 1933, 1934, 1936 and 1940 Fords, also Pontiac powered. |
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#6
12-09-2019, 07:03 PM
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Not sure why the first post has normal pictures and the second group are HUGE. Sorry about that.
-Abone.
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Daily Driver Model A Ford. 389 Pontiac w/6-71. 10.80 @129.5 1933, 1934, 1936 and 1940 Fords, also Pontiac powered. |
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#7
12-09-2019, 08:28 PM
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Cool rod!
I have a crunched(previous owner backed it into the wall) Late Model that has one in it that has some kind of posi probably like the ones with helical gears.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#8
12-10-2019, 02:52 AM
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abone- Do all brands of QC's have straddle-mounted pinions (like 9" Fords do)?
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
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