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Discussion Starter #1
Been driving several different classics over the years, and finally Thursday brought home the one I've truly always wanted. Didn't go financially too far out there with a goat, 1966 Lemans, bodywork and frame all done, 455, original 2 speed powerglide, one leg 10 bolt. Time to start having fun...
 

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Sharp looking car! I would suggest removing the GTO-clone emblems off the fenders, leaving the GTO hood, and installing a 3 speed TH 350 transmission as funds permit. The real first gear of a TH350 will give the car a ton of performance....night and day. Straight bolt in. Your car isn't a Powerglide....it's a SuperTurbine 300, which is a heavier duty unit and not used by Chevrolet. Your car looks to have nice original interior, too. My first car at age 18 was a '66 GTO 40 years ago....but I always liked the tail lights of the LeMans better. Have fun with it!
 

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Thank you! I was planning on a 350 or 400, posi in the rear, remove air shocks, taller springs back there and just enjoy it!
 

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Great plan. Car looks like they used to circa 1980, when they were 13-15 year old used cars. Looks pretty original and unmolested which is a good thing. You should hunt down the missing rocker trim, wheel well trim. and window drip rail trim...it would dress it right up. Looks like it's painted 1967 Regimental Red, which I like better than the '66 Montero Red. Hard to beat the lines of a '66-'67 Pontiac A-Body!!
 

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Great plan. Car looks like they used to circa 1980, when they were 13-15 year old used cars. Looks pretty original and unmolested which is a good thing. You should hunt down the missing rocker trim, wheel well trim. and window drip rail trim...it would dress it right up. Looks like it's painted 1967 Regimental Red, which I like better than the '66 Montero Red. Hard to beat the lines of a '66-'67 Pontiac A-Body!!
The PO said the body was amazingly clean after blasting, saw the photos, one fender patch, one quarter patch. Dont know yet the paint info, but recent and good quality. I'm going to go for the rockers, wheel well trim, but more a gto look minus emblems.
 

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Sharp looking car! I would suggest removing the GTO-clone emblems off the fenders, leaving the GTO hood, and installing a 3 speed TH 350 transmission as funds permit. The real first gear of a TH350 will give the car a ton of performance....night and day. Straight bolt in. Your car isn't a Powerglide....it's a SuperTurbine 300, which is a heavier duty unit and not used by Chevrolet. Your car looks to have nice original interior, too. My first car at age 18 was a '66 GTO 40 years ago....but I always liked the tail lights of the LeMans better. Have fun with it!
Btw, appreciate the info, superturbine. Been in a Ford for a minute, forgot some details. Will a superturbine hold up to a 455? Street car with some spirited driving. Not a drag car. Was told a '73 455, need to look st the numbers.
 

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Super Lemans! Mine is a 1966 As well and I have a 461 Stroker motor. Listen to geeteeohh guy on that trans. I did what he recommended to me a few years ago, I took out the super turbine 300...And put in a 350 TH with a shift kit and a dual gate shifter. Really great,bolts right in no drive shaft change needed.

The 350 is a strong trans, but I also added a “Ratchet Diode” put in by Performance Torque Converter PTC,... they build the race converters and transmissions too. They said they put it in drag cars and it would take a thousand foot pounds of torque, and they have not broken one yet.

Butler said my engine would have about 500 to 550 ft lbs of torque, so the 350 can easily take it and may have been ok anyway.

I then put in a gearvendors overdrive, had to put in a new driveshaft and crossmember, but that is awesome as well.

Your car is super, enjoy it, and congratulations!
 

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Super Lemans! Mine is a 1966 As well and I have a 461 Stroker motor. Listen to geeteeohh guy on that trans. I did what he recommended to me a few years ago, I took out the super turbine 300...And put in a 350 TH with a shift kit and a dual gate shifter. Really great,bolts right in no drive shaft change needed.

The 350 is a strong trans, but I also added a “Ratchet Diode” put in by Performance Torque Converter PTC,... they build the race converters and transmissions too. They said they put it in drag cars and it would take a thousand foot pounds of torque, and they have not broken one yet.

Butler said my engine would have about 500 to 550 ft lbs of torque, so the 350 can easily take it and may have been ok anyway.

I then put in a gearvendors overdrive, had to put in a new driveshaft and crossmember, but that is awesome as well.

Your car is super, enjoy it, and congratulations!
Thanks for your story, I was thinking a th400, my guy says driveshaft modification is needed, but if a good 350 can hold up with a straight swap I'll do that. So I had the mechanic over today who built this car with the PO. The 455 was bored and built, he had opened it up when purchased, all good new parts! What a relief, not a motor that "may or may not" be fresh. Starter gear was destroyed so hes replacing that. I have no time and just want to drive for a few months.
 

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Yes the 350 is strong and you can buy it built with a stronger Sprague or even a ratchet diode like I did, bolts right in no crossmember moving or driveshaft cutting..

Check out Coan Transmissions....they can do it many others as well
 

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With a strong 455, would a 10 bolt built up be wise or at what they can do move to a 12. I'm going to do both the trans and rear, but will do each over time. Not sure which is the better starting point though.
 

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First order of business is new rear springs. Car was bought all new stock suspension, 235 tires up front, 275 out back, yet the heights at hubs are 27.5" to lip in front and 25.5" to quarter lip, both at highest points. Rocker too, at front 11 5/8" in front, 11 1/4" in front of quarter. Strange.......

Bought s pair of Eaton springs and Moog 5235 wagon springs, same height, seam to be similar coil and distance between.
 

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Ride height

First order of business is new rear springs. Car was bought all new stock suspension, 235 tires up front, 275 out back, yet the heights at hubs are 27.5" to lip in front and 25.5" to quarter lip, both at highest points. Rocker too, at front 11 5/8" in front, 11 1/4" in front of quarter. Strange.......

Bought s pair of Eaton springs and Moog 5235 wagon springs, same height, seam to be similar coil and distance between.
Here's some comments on ride height: https://www.gtoforum.com/f50/66-gto-ride-height-27913/

I have a '66 with air shocks (I think factory optioned if I remember correctly), anyways... I'm so used to the rear being slightly higher on my cars that I was shocked to see that the rear measurement at the rocker at factory spec is actually slightly lower than the front. If you're interested I'll check my files for the information that I found.
 

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With a strong 455, would a 10 bolt built up be wise or at what they can do move to a 12. I'm going to do both the trans and rear, but will do each over time. Not sure which is the better starting point though.
i have a TH350 built for 600 hp and still beating up my peg leg 2:56 after 9 years. 462 motor is putting out around 500TQ and no issues yet. if you have sticky tires it might be a different story. Have a 3:55 12 bolt waiting to go in when the 10 gives out.I agree with GEETee on the taillights. so much i had to find the center piece that was only on the LeMans. Also on the badges, you can get repo ones for the lemans and tempest now, i would take gto's off and leave hood maybe get the GTO front grille. Like This.

I used combination of Moog wagon springs and airbags, with a little lower profile front tire to get a 1" rake to the car without effecting geometry or handling.
 

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Discussion Starter #17
With a strong 455, would a 10 bolt built up be wise or at what they can do move to a 12. I'm going to do both the trans and rear, but will do each over time. Not sure which is the better starting point though.
i have a TH350 built for 600 hp and still beating up my peg leg 2:56 after 9 years. 462 motor is putting out around 500TQ and no issues yet. if you have sticky tires it might be a different story. Have a 3:55 12 bolt waiting to go in when the 10 gives out.I agree with GEETee on the taillights. so much i had to find the center piece that was only on the LeMans. Also on the badges, you can get repo ones for the lemans and tempest now, i would take gto's off and leave hood maybe get the GTO front grille. Like This.

I used combination of Moog wagon springs and airbags, with a little lower profile front tire to get a 1" rake to the car without effecting geometry or handling.
Great thanks for the response on springs. What's your tire setup? Looks clean and balanced, not a lot of rake with wagon springs. I'm thinking trans first, then spin both 10 bolt wheels down the road after reading many opinions/articles.
 

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15" 235/60 fronts and 245/60 rear with 2 1/2" or more offset (important because the rears WILL rub under compression and fronts may rub when cutting sharp backwards in reverse with 245's and you dont want to have to trim or roll the 2" fender lip.) with the new springs it will sit a little high until they break in then it will settle. Wagon springs have a stiffer compression rate for more load and will eliminate some of the roll and make it more responsive in the corners. Another upgrade is a new steering box with a closer ratio 3 turn stop to stop. I also upgraded to power brakes with slotted disks in front. these can both be done on a budget with circa 70's GM parts from yard or store and make a huge difference in the ride, safety and handling of the big cars.
 

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Nice Starter Dave!
Always liked the Trim details of the '66 Lemans.
Bought one of my first in '83 while living in Long Branch NJ.

Best of luck with it.
 

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Ok, so came across something interesting and need help... battery seemed to be lagging so I swapped out to a 800 Cranking Amp, not Cold Crank Amp. Once I installed, it is 97% starting but wont fully fire, kept trying and resting an hour in between. Took off the air filter, tried 3 times, on the third saw gas spray up. 30 over 455, stock starter, gas in fuel filter, mechanical fuel pump, clean gas, Weber carb. Distributor bolt is tight. Could the Weber carb be off?
 
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