acceleration q/problem

[Boone83K10]

drops back down to 1-2 in first then revs back up and shifts normally


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that sounds more like a trans problem than engine. A TH350 should have a line from manifold vacuum on the engine going to the modulator on the passenger side of the trans. If it is not hooked up, that causes shift points to be very high RPM.

here is the modulator location..

[75_chevy]

it does have that hooked up, where it connects to the manifold it was a very loose connection so we corrected that, and if anything while I'm driving the tranny shifts too soon. also I hooked up a vacuum gauge and it looked pretty solid. also I was racing my buddy a few times last night in his ranger and I didn't have the acceleration problem I spoke of before. but I still don't think the trucks running at it's full potential. on a mile long downhill I had the truck floored and about half a mile in we were at 90mph where I would have thought I shoulda buried the needle by then. I think my tranny kickdown is getting snagged since it's on the original bracket it's on and i put on the edelbrock carb and never changed the bracket. gonna order the bracket and see what happens


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[Boone83K10]

I bet it is shifting properly now and you were just used to the wrong way. I bet you have the GM 350 basic crate rated at 195 hp, so 90 by a 1/2 mile isn't too bad.

also, why don't you take off that smog pump below the alternator. it doesn't look hooked up and creates parasitic drag.

[75_chevy]

that's the plan Boone. just disconnected it when I got the headers and haven't got a new belt yet so I can't fully take it out.


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[75_chevy]

this is the motor I have Boone, rated @ 260hp http://www.jegs.com/i/Proform/809/10067353/10002/-1


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[Boone83K10]

Cool, nice motor.