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Old 11-07-2010, 09:18 AM
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63pontiacgp 63pontiacgp is offline
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Default New Tranny in my GP

Hi all, been absent for quite a while. My Slim Jim finally finally went out about a month ago on the way back from the Golden Super Cruize. Got the car back on friday with a 200-4R installed and I must say that it is sweet. Highway speeds at 2000 to 2100 versus the 3200 before. On the Roto my distributor vacuum was ported. According to my manual the Super Hydramatic cars like the Bonneville's used manifold vacuum versus ported. Any thoughts on how I should go with the 200-4R installed?

Mike

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Old 11-07-2010, 03:20 PM
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stevep stevep is offline
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Try it both ways and see what you like better.

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Old 11-07-2010, 07:03 PM
mike nixon mike nixon is offline
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Ported will gain you mileage and some performance. You'll probably have to play with the base timing if it was manifold.

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