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Old 12-01-2003, 07:22 PM
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gto turbo 400

Hi all!
Great site,very informative!!
I am buying a '66 gto, it has a 389 with 4bbl, and a powerglide. I would like to put either a turbo 350 or 400 in it. Does anyone know what's involved with making the change? Do I have to change the yokes? If so do any sock yokes fit?
Thanks all for all the info!!!

Hog

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Old 12-01-2003, 11:52 PM
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Have you consitered a 200-r4 instead?
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Old 12-02-2003, 12:28 AM
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The 350 you won't have any problems with, but if you go to a 400 you have to do one of several things. The tranny needs to be a short shaft 400 for starters, the trans cross member needs to be moved back and a second set of holes drilled into the frame for it. The shifter will need to be swapped with a new shifter cable set up that will read correctly. If you go to a 400 you will either need to cut down your drive shaft, or find a 67' GTO 400 driveline. You will need to have the yoke off of a 400 as well. The 350 is an easier swap, but both can be done. It really depends on how much hp you plan on running and/or if you are doing any drag racing.
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Old 12-02-2003, 04:07 AM
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Thanks for the quick reply.

Robin
I have access to a turbo 350 and 400, both need freshening up, but I have both. So I never really considered the 200. Plus isn't the 200 computer controlled? If it is, isn't it a more difficult upgrade? And what changes to the drive line need to be done?

Joe
I am going to have the motor freshened up, but keep it fairly close to stock, maybe 30 over, so I should be below 400 hp. So it sounds like the t350 is the easy swap. If going to the 350,it's just a straight swap,the driveshaft and crossmember line up, the only change would be the shifter? That sound easy and cheap.

Again thanks for the replies.
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Old 12-02-2003, 05:33 AM
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Hog, if you want some further help on the swap check out www.performanceyears.com It's a nice Pontiac site with alot of helpfull peeps on it. See you there!
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Old 12-02-2003, 02:41 PM
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Hey Joe
Great site thanks for the link. I must have missed that one while browsing. Thanks again Ed
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Old 12-02-2003, 05:18 PM
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Nope the 200r4 isn't computer controled it just requires either a toggle switched or a controler (that lots of places sell) to engage the lock-up converter. I just suggested it as they are real nice if you plan to be doing some highway driving an are pretty strong and a very easy swap too.
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