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#1
09-05-2013, 12:01 PM
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66 3 speed and 4 speed questions
Hello all...I have a 66 Lemans with a Pont 350 and TH350 with 3.36 rear. I want to put a 4 speed in mine.
I bought another 66 with a factory 3 speed, 326 so all of the parts are there to convert mine to a manual. The questions I have are: will the flywheel transfer to mine? same bellhousing for a 3 speed and 4 speed? will I have to change my rear end ratio? Thanks! Jeff
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kcmusclecars.com |
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#2
09-05-2013, 02:06 PM
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I would think you would be good to go.
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#3
09-05-2013, 02:37 PM
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The Bellhousing should have holes for both the 3 and 4 speed. The flywheel register hole for the crank may not work, there are two different sizes.
Which 3 speed trans is it? The HD dearborn, (ford), or the standard light duty 3 speed? If its the Dearborn, the output splines are different than a muncie 4 speed. Would have to change the slip yoke if thats the case.
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 66 GTO, 495, M22, Strange S-60 w/4.10 Sold new at Royal Pontiac (Dealer# 07-679) 70 Formula 400/auto |
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#4
09-05-2013, 03:08 PM
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With the 4 speed you will continue to use your driveshaft and and yoke that you have on the TH350, and it will NOT require any modification. The crossmember wont move, and you won't have to fool with the parking brake cables etc.
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#5
09-05-2013, 03:41 PM
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Very easy conversion. Your rear end ratio is perfect for a stickshift car. 3 speeds, 4 speeds, and the TH350 all have the same 1:1 final drive ratio, so the only change you'll notice is slight lower rpm's on the highway due to no torque converter slippage.
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Jeff 
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#6
09-05-2013, 04:58 PM
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Flywheel register will not be an issue, it will swap.
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#7
09-05-2013, 06:33 PM
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Thanks so much for all of the replies! Sounds like I'm good to go.
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kcmusclecars.com |
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#8
09-05-2013, 06:56 PM
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Just make sure the 350 crankshaft is drilled for a pilot bearing, some auto trans crankshafts won't accomodate one.
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#9
09-07-2013, 07:07 PM
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I should be able to tell that by the block code correct? "W" is manual? "Y" is auto?
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kcmusclecars.com |
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#10
09-07-2013, 07:14 PM
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Quote:
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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/[email protected], .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears |
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#11
09-07-2013, 08:26 PM
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Ah ok. I guess I'll have to just pull her apart and take a look. Thanks.
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kcmusclecars.com |
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