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need answer to putting a auto 4 speed into 70 cutlass 350 engin


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What tranny would be best to put into a 1970 olds cutlass s .

Right now it has the turbo 350 and i would love to put a overdrive tranny in it.

Is this a big job or is it straight forward? Thanks for any imfo in advance... <img src="/ubbthreads/images/icons/smile.gif" alt="" />

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The 200-4R overdrive is your best bet here. It will bolt up to your 350 block. You'll need a TV cable and carb bracket which are dealer or junkyard items. Possible you'll have to modify the driveshaft and crossmember, but a 200 and 400 are almost identical size, and THM 400 was a Cutlass option, so, minor problem.

These conversions are done daily and have proven reliable.

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  • 3 months later...

I installed a 700R4 into my 71 Cutlass Conv. actually it was a fairly straighforward deal.

you will probably need an adapter plate, and if you wish an adustable switch to enable or disable

the converter lockup, also an adjustable bracket for the throttle cable and tv cable. I really

like mine not only for better mileage/lower revs but also for the deeper first gear.

You can buy all of this mail order but I had mine locally built and installed in case of problems.

Good luck.

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