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I have a 396 SS/RS convertible (born with a 327) and I am trying to bring the rest of the equipment up to status. The radiator needs to be enlarged (21" to 23"). The tic, toc, tac should redline at 5500 (currently 5000) and the rearend need to be changed out to a 12 bolt (currently 10 bolt). I have a 350 turbo automatic but should be a turbo 400 automatic to be 396 corrrect. I've considered changing out to a four speed manual (? 6 speed). Your thoughts?
 

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68fan,

I went through a similar situation 15 years ago on my first 1969, If you run 3:73 gears or less in your 12 bolt a THM400 will be fine. The THM 400 is a strong trans and it's better suited for higher horsepower & torque applications than a Turbo 200, 200-4R, THM350, 700R4, 4L60, 4L60E, 4L65E and in my opinion a 4 speed. All but a 4L80E.

If you run a 4:10 gear or even a 3:90 I would recommend an overdrive trans. Alot depends on how you plan to drive it and when the specifications of your 396 are or will be.

Good Luck!! :thumbsup:
 

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When putting my 69 together I went with a 396 with a T-400 and a 12 bolt 3.73 posi rear end. I drove it that way for about 9 months before I swapped out the T-400 for a TKO 600 5 speed overdrive manual trans. I do a lot of driving out on the highways with mine, and that overdrive trans. makes the car much more enjoyable to drive with the rear end ratio the car has. It cuts down the engine rpm and additional exhaust noise and engine heat. Not only that the manual makes it so much more fun to drive--being able to have much more input into actually driving the car! By the way--in town driving is not really all that bad with the manual--I can drive 25-35 in 4th or 5th and the 396 still has torque to take right off without the necessity of always downshifting!
 
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