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Old 11-10-2005, 05:04 PM
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65' GTO... Swap to TH400

The tranny on my goat bit the dust at 150k miles. I was wondering what size Turbo 400 would fit my 65' GTO. It has the original 2 speed Super Turbine 300 behind the original 389.

I would really like to get my car back on the road.

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Old 11-10-2005, 06:27 PM
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A 400 turbo will fit using all factory parts. You will need a turbo 400 short tail trans, BOP bolt pattern. A 400 crossmember for 66-72 Chevelle/BOP clones.. An electric kickdown switch/wiring for downshifts and a shorter driveshaft with a larger diameter front yoke.
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Old 11-10-2005, 06:35 PM
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Thanks Bob. I was hoping I wouldn't have to change out my driveshaft. What driveshaft will bolt up to this setup? Also, I am not familiar with the wiring for downshifts. Any input would be great.
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Old 11-10-2005, 08:12 PM
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A driveshaft from a later year (66-67) 400/GTO/442/GS should fit. You may have to use an oddball rear u-joint. They are available at any real parts store.

The 400 turbo does not use a mechanical (cable/rod) throttle opening sensor. On the OEM setup a switch was mounted on the throttle linkage to signal the trans (when the pedal was pushed down to pass/accelerate) to downshift.
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