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Old 01-17-2013, 08:39 PM
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1st drive with new 400sbc and powerglide trans

okay so for my 1st drive of the 400 things seem a little weird. I have a powerglide and tci 24-2600 stall converter. the car didn't seem like it wanted 2 shift out of 1st for a very long time. I only averaged about 30mph the whole trip home. but being used 2 the 307 I could tell when it needed to shift. the car did shift out of 1st when I let off and got back in a few times. could the motor b looking for a certain rpm before it shifts into 2nd? I have a big 488/510 cam with 114 lsa. should I b worried about burning up the trans or something? the torque converter is fairly new.

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Old 01-17-2013, 09:54 PM
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post the stats on that cam
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Old 01-17-2013, 10:41 PM
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do you have the throttle linkage for the powerglide hooked up?

That linkage affects shift timing.

The modulator on the powerglide affects line pressure
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Old 01-17-2013, 11:12 PM
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hyd flat tapp rpm range 3000-6500(rated350)
intake dur. 050 234/244
adv 292/302

I do believe its something with the throttle linkage. from what I see my dad left a spring hooked up to one of the valve cover bolts. I see a part where there loiks like the spring was supposed to go, but the spring is 2 big. think autozone will have wat I'm lookin 4?
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Old 01-17-2013, 11:22 PM
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ima post a pic in my album and tell me if I think I'm on the right track.
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Old 01-19-2013, 11:41 PM
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having driven it a little more to understand the motor.
I can see it goes to about 40 in 1st. then I can let off and hear it go into second. in second when I press the brakes it can drop down to about 20 or so before it shifts back into first.

I LOVE THE 400'S TORQUE. I can let completely off the gas in 2nd and the car drops to idle it sounds like and just chugs along. I chugged along one road for about close to 2 miles @ 36-38 mph.
I have seen a 17 mile highway trip from work without the gas guage barely movig so I'm happy about those potentials.
I'm very grateful 2 be the driver of this car and will do my best 2 respect it and its power.

NEXT BIG FOCUS is gonna b TRACTION and beefing up the powerglide.
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Old 01-19-2013, 11:52 PM
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best way to beef up the glide is to install a t400. no kick down linkage,move the x member back 2 inches,shorten and balance drive shaft,change yoke.
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