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Old 01-06-2011, 11:11 PM
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!966 powerglide trans vs turbo 350

Have a 66 Impala 327 with the powerglide tranny in it currently. I also have a rebuilt turbo 350 sitting at home that I have thought about putting on in the summer. Was just wondering what improvements I would notice if any with the turbo 350 tranny in terms of speed gas mpg ect.

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Old 01-07-2011, 01:50 AM
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MPG should stay the same, both transmissions are 1:1 in high gear. The TH-350 will leave the starting line faster, due to the lower first gear ratio, TH350 is 2.52 in low, P-glide is 1.76(V8)or 1.82(6 cyl). The TH 350 will get the car moving easier and faster, especially a big car like yours.

You'll need a Th350/TH400 torque converter, but it should be an easy bolt in, the 350 will use the same mount, crossmember, and driveshaft as the Glide. You'll need to work with the shifter linkage.
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Old 01-07-2011, 02:47 AM
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Quote:
Originally Posted by ericnova72
MPG should stay the same, both transmissions are 1:1 in high gear. The TH-350 will leave the starting line faster, due to the lower first gear ratio, TH350 is 2.52 in low, P-glide is 1.76(V8)or 1.82(6 cyl). The TH 350 will get the car moving easier and faster, especially a big car like yours.

You'll need a Th350/TH400 torque converter, but it should be an easy bolt in, the 350 will use the same mount, crossmember, and driveshaft as the Glide. You'll need to work with the shifter linkage.
The Th350 is actually in a Camaro I have and its got a converter in it already so I would be all set there. Now as for shifter linkage are you talking about the cables that run from the shifter to the tranny? Also by work with do you mean mod the existing linkage or will I have to buy new cables and linkage?
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Old 01-07-2011, 05:14 AM
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If it is the factory floor shifter for the 2 speed you will need to look for what is needed to make it match the TH350, sources will be the restoration parts suppliers for the Caprice/Impala/Biscayne. It will either be parts for the shifter internal gates to enable it to have enough positions for the additional speed, or a different trans lever/cable mount/link.

If you use the Camaro floor shifter and cable it won't need any modifications, other than mounting it in the Impala
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Old 01-07-2011, 06:59 AM
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My Impala has a column shifter currently and as for the Camaro don't I don't know if I have a cable for it or not. It has been awhile since I have messed with it. Car was set up for b&m shifter and had a cable for it somewhere but think I also had the stock cable.
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