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#1
07-01-2008, 11:35 PM
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'77 Super T-10 Help
Anyone know what these numbers mean? I've searched but not much luck. I'm hoping this is the original 4-speed to my '77 Formula W72. Mine has 5 rings on the input shaft. When I bought the car 3-4 years ago. The guy said the tranny is a fresh rebuild. It has been sitting in the shed so it rusted a little. I have never messed with a 4-speed so I need to do alot of info searching. Thanks for any help!! There's bigger pics on the first link. The ones below are a little photochopped.
http://www.pontiaczone.com/forum/showthread.php?t=22084   
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10C 1972 Formula 461 non A/C 08B 1969 GP J/428 non A/C |
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#2
07-02-2008, 02:09 AM
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NOW,FIRST THINGS FIRST!
Get our your wire brush or wire wheel & clean off that rust on your input shaft RIGHT NOW! Get some oil on it,ASAP! Shame on you! Seriously,I don't believe that transmission is the original for your 77 W72. As I recall,the "correct one" should have only TWO cuts in the input shaft spline. (2:64 low gear) FIVE cuts in the input spline will net you a 3:?? low gear. (need to check my charts on that one) Those ones were generally put behind the smaller cube/lower HP motors to make them seem faster. The 1/2" x 3" pad on the top of trans. in your first picture should have a partial vin stamped on it & I'm betting it AIN'T yours. Does your 77 still have it's original 3:23 rear axle? |
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#3
07-02-2008, 03:27 AM
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Sorry...I'll get to the rust tommorow!! those are the only numbers I can find. I don't see no VIN stampings. From my searching, the five rings meant a corvette ST-10. I'm not sure what rear gears are in it. It has the right code & posi. The car is buried in a storage unit as of last Saturday.
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10C 1972 Formula 461 non A/C 08B 1969 GP J/428 non A/C |
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#4
07-03-2008, 02:43 AM
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Probably a 2.88 first gear ratio, not really a good ratio for use behind any high torque Pontiac engine...........probably is out of a Vette. Might last OK if you dont run it too hard........just normal street driving.
Here is a link for you to check out................... http://fiedlerh.home.att.net/BW.htm
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"It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived."- General George Patton "Perpetual peace is a futile dream."-General George Patton "I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them."-Thomas Jefferson "Any society that would give up a little liberty to gain a little security deserves neither and will loose both."-Benjamin Franklin |
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#5
07-03-2008, 04:46 AM
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Quote:
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#6
07-03-2008, 06:53 AM
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The original Super T10 would have had a 2.43 first gear ratio
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John Witzke POCI Tech Advisor 1977-79 W72 Performance Package Historian |
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#7
07-04-2008, 10:32 PM
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Is this tranny any good? Can I change the guts to run on a Pontiac? Was the original 2-groove the better ones? I was going to run an extra motor ('78 W72/.030 mild 400 (comp XE262H) that I have and keep the WA code 400 on the engine stand. Maby I should open up the 69K WA motor and see if it's been rebuilt. I have a new balanced assembly with .030 trw's & '69 crank/rods.
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10C 1972 Formula 461 non A/C 08B 1969 GP J/428 non A/C Last edited by greyno3; 07-04-2008 at 10:40 PM. |
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#8
07-04-2008, 11:30 PM
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The original 2 groove trans would ultimately be stronger,because the gears have LESS teeth which make them bigger,but you shouldn't have any problems with it behind a "mild" 400 if you change gears using the clutch & don't sidestep the pedal for that "extra FAST" start!
With the TALL low gear,you will LOVE how fast it leaves the line,but the revs DO climb fast & be ready for second. |
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