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Old Aug 24, 2013 | 09:13 PM
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75hiboybeast
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Auto transmission

Looking to replace 4 speed out of my 75 with an automatic, has 390 in it, what transmission should I look for and what years. Friend has a c6 with 205 transfer, not sure what year and believes it was mounted to a 351.
 
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Old Aug 24, 2013 | 09:18 PM
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351 trans won't hook up to a 390. You need a trans from an FE motor.
 
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Old Aug 24, 2013 | 09:20 PM
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73 through 76 would be your best bet. Any particular reasons you are switching? Pm if you're interested in selling it.
 
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Old Aug 24, 2013 | 09:29 PM
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Looking to switch for easier driving around town. Will sell once I find trans to switch out with
 
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Old Aug 24, 2013 | 09:48 PM
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With divorced tc you have a little leway with what you can do. however you will have to find a c6 with the FE bellhousing, the c6 is cast so there isn't any way to just swap them. you can use a c6 out a 2wd and just shorten the drive shaft but it would just be better to use the 4x4 version out of a highboy so that you can still hook up the tcase shifter.

c6 came out with the fe in 65 but not sure on the 65-72 4x4 set up, I'm sure some others will chime in.
 
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Old Aug 24, 2013 | 09:53 PM
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Thanks, at least I have a starting point, think I would rather stay with one out of 4x4, than to have to do a lot of swapping to make work.
 
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Old Aug 24, 2013 | 09:57 PM
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Believe me, you will appreciate in the long run. Threw my t-18 in mine cause I just needed the truck to be working, now just looking for the original setup as it will be way easier.
 
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