Re: 401/200R4 shift points??
For what it is worth my Skylark is getting around 16mpg hand calculated driving normal. Just bought the car last fall and only driven it a few hundred miles and know little about the driveline. The previous owner told me it was a 1964 401ci with approx. 78k miles. He claim to have freshened the heads, he put a Mallory ignition system in it and a new 600cfm Edelbrock carb. He said it has a TH400 tranny but it may be the SP400, dont know enough to tell yet myself and the rear was out of a mid/late 60's Pontiac Temptest with what he though were 2.73 gears or somewhere in that range. I have not pulled the rear cover yet to verify the ratio. What rpm it runs at i do not know as the only tach that was in it was a huge aftermarket gaudy race tach that i told him he could keep. But the engine by ear seems to be running around 2200-2500rpm my guess. When cruising it has plenty of punch when nailing the gas and pulls strong up to 85-90mph which is the fastest i have had it so far. Personally my plan down the road is a shift kit, lower gears "probably 4.10's" and a gear vendors overdrive.
1965 Buick Skylark, 401/TH400, 10bolt posi with 2.73's, project car already started for me.
Daily driver is 2006 ECSB D-Max "Isuzu"/Alli/American rear, 120hp tune, PPE airbox mod, Flowmaster turboback Fisher plow
2002 GMC1500 5.3/junk slush box/ 10 bolt rear, Fisher plow
Sold and missed, 2006 RCLB D-Max "Isuzu"/Alli/American rear, bone stock, Fisher plow