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post #1 of 22 (permalink) Old 08-12-2008, 08:01 PM Thread Starter
 
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66 gto ?

hello, just found this forum and hoping someone can help with a few ?. im working on a 66 gto 389 tripower, does anyone know the curb weight, its a 389 tripower/ 4 spd, no air
also the vibration dampener is kind of odd, its more or less just a hub that the pulley bolts to, no rubber core and outer ring like a chevy? is this right?its also cracked near the keyway , are any replacements available? last ?, someone put a 58 chevy rearend in it and were trying to find a 66 rear to go in it, does anyone know what will directly interchange(chevy, buick olds ect) and will gears from a chevy work in the pontiac rear. any info is really appreciated
thanks
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post #2 of 22 (permalink) Old 08-12-2008, 08:28 PM
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Curb weight is around 3600 pounds for a hardtop. The balancer should have rubber visible between the two pieces. It may be painted. It doesn't matter, though, 'cuz it's cracked. Unusable. New ones are available through the vendors (Year One, Ames, ETC.). Get a new one. Any 10 or 12 bolt rear from any GM A-Body from 1964 thru 1972 will work. By A body, I mean Tempest, GTO, Lemans, Chevelle, Skylark, Cutlass, etc. The 1966 and later units are one inch wider than the '64 and '65 units. You can run a slightly wider rim with the earlier units. Chevy gears? What for? Use the gears the rear came with, or spend the big bucks and get a posi with new gears. Hope this helps.
Jeff
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post #3 of 22 (permalink) Old 08-13-2008, 08:42 AM
 
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No Luck, Welcome. You should have no problem finding the proper fitting 10 bolt rear for your GTO. Consider going with a 3.55 rear gear, as this is a good all around set up for your car. EA



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post #4 of 22 (permalink) Old 08-13-2008, 10:27 AM
 
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No luck, I just took my 355's out of my 10 bolt "66" two weeks ago and put in 323's, PM me if interested in buying.
Good luck.....Rick

1966 GTO tri-power 4 speed competition-plus, Tubuler Automotive competition headers. 58 thousand miles. Owned since 1969
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post #5 of 22 (permalink) Old 08-13-2008, 11:04 AM
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How do you like the 3.23s?
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post #6 of 22 (permalink) Old 08-13-2008, 06:15 PM Thread Starter
 
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thanks a lot for the replys, you all helped a lot
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post #7 of 22 (permalink) Old 08-14-2008, 05:24 AM
 
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Quote:
Originally Posted by Rukee View Post
How do you like the 3.23s?
Hi Rukee,
Not a huge change, I still need to change the speedo gear, but I do have peace of mind having all new seals and bearings.
Thanks for asking....Rick

1966 GTO tri-power 4 speed competition-plus, Tubuler Automotive competition headers. 58 thousand miles. Owned since 1969
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post #8 of 22 (permalink) Old 08-15-2008, 09:21 AM
 
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Mine has a T400 with 2.98"s...dead off the line, but from 50 mph up, really flies...



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post #9 of 22 (permalink) Old 08-15-2008, 09:58 AM
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Eric, are you sure you don't have 2.93'S? That's what my buddie's '67 had (it was an A/C car) and it would kick down into passing gear at 85mph!! We'd listen to Deep Purple's "Highway Star" and go out looking for prey........
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post #10 of 22 (permalink) Old 08-15-2008, 03:51 PM
 
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Yep that's what i meant...2.93's....a friend of mine had a 66, maroon, named "highway star".........I am thinking of a set of 3.55's . I need a little more gear so I can bake some of the excess meat off the rear tires Eric



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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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