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I have a guy (non car guy) looking to sell his 66 convertible and he says he has a 200 with a five speed in it. What five speed would fit behind a 200?
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I know a guy with a T5 behind a six in a 67. Don't know any particulars, but can check with him on Thursday if you'd like.
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rpm wrote:
I know a guy with a T5 behind a six in a 67. Don't know any particulars, but can check with him on Thursday if you'd like.
Thanks, but I was just looking to see if it actually had been done. I sent him to an appraiser so he can get a better idea of the car's worth and thus an asking price. Just wondering if it would enhance the value over a typical three speed behind a 6.
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I can't see a modern transmission not increasing the value. With the narrower operating range of a 6 I'd think it even more beneficial, especially if the rear has been geared to something in the 3.50-3.70 range. That combo would probably wake that car up far more than typical engine bolt ons.
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Having a 5-speed can make driving more fun., and increase the car’s value. As TKO mentioned, if the rear gears aren’t adjusted appropriately, or other actions taken, that six cylinder may not have the power to properly drive the car in 5th gear.
Just saying.
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Modern Driveline has a kit. It has been done many times.
T-5s are the transmission used.
Last edited by Muzz 66 (12/11/2025 4:31 PM)
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BobE wrote:
Having a 5-speed can make driving more fun., and increase the car’s value. As TKO mentioned, if the rear gears aren’t adjusted appropriately, or other actions taken, that six cylinder may not have the power to properly drive the car in 5th gear.
Just saying.
Most of the 200 sixes had 3.20 gears in the back. It will do fine.
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Muzz 66 wrote:
BobE wrote:
Having a 5-speed can make driving more fun., and increase the car’s value. As TKO mentioned, if the rear gears aren’t adjusted appropriately, or other actions taken, that six cylinder may not have the power to properly drive the car in 5th gear.
Just saying.Most of the 200 sixes had 3.20 gears in the back. It will do fine.
I’m not sure I would agree, using a 0.68 5th gear as an example, would bring a 3.20 rear end down to 2.17 final drive ratio. Seems like that would be a strain on the torque available from a 6 cylinder engine w/o a power upgrade.
But that’s just my opinion.
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I did a conversion on Deb’s 66 coupe 200 about twenty years ago. I used a CPC adapter plate for the original six cylinder bellhousing converted for my design cable clutch. I also did some customer bellhousing mods on a few others. I used a Ranger 9” diaphragm style clutch and T5 release arm and bearing. T5 rear crossmember from a v8. Drilled, tapped and installed a T5 pivot stud in the bell.
These worked quite well with clutch effort being very light. She got over 30 mpg on the highway with a 3.40 rear gear and no mods to the engine other than headers with dual exhaust. It was a blast to drive.
Note this does not work so easy on s 1965 model due to the stepped flywheel and the different bell bolt pattern.
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Thanks for the input. I'll let him know the 5 speed is a plus
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