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Old 08-18-2010, 10:46 AM
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car wont move after sbc to bbc swap....

My car sat for one year after pulling my sbc motor and building my big block motor for my 71 Chevelle. After putting in the new big block, I have to rev my motor to 2,000 - 2,500 rpm to make it even start to move. Not like it use to be with the small block. It has a TH350 trans and is full of fluid. I took it down the street the other day and while cruising in first gear at around 2,500 rpm but only maybe 25 mph, it suddenly engaged or something and took off like it should. After pulling back in my driveway, I again had top rev it to move even slightly. What could this be? Everything bolted back together fine. Maybe stuck valves...?

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Old 08-18-2010, 11:08 AM
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Have you checked the shifter linkage/cable adjustment?? Could be that simple.
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Old 08-18-2010, 11:57 AM
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the trans, shifter, etc. stayed in the car during the swap.
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Old 08-18-2010, 12:01 PM
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Quote:
Originally Posted by rbomar
the trans, shifter, etc. stayed in the car during the swap.
Did you leave the torque convertor on the transmission or have it bolted to the flexplate ? If you had it bolted to the flexplate when you installed the engine , you most likely broke the lugs on the transmission pump .
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Old 08-18-2010, 12:16 PM
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I left the converter on the trans while the engine was out of the car. Would this have damaged the trans?
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Old 08-18-2010, 12:30 PM
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Quote:
Originally Posted by rbomar
I left the converter on the trans while the engine was out of the car. Would this have damaged the trans?
No , that would have been the correct way to do it . Did you make sure that the converter was still seated all the way back in the trans before installing the trans ? If you want to check to see if the trans pump is still okay , unbolt the convertor from the flexplate and slide it back into the trans and spin the convertor by hand in the normal rotation . There should be a smooth resistance as the transmission pump makes pressure , If it just spins free with no resistance , time to look deeper . Also you can loosten the transmission cooler lines to see if there is pressure and / or check P1 pressure . But I am trying to make it simple and then go from there .
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Old 08-18-2010, 12:33 PM
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Quote:
Originally Posted by rbomar
the trans, shifter, etc. stayed in the car during the swap.
Just because it stayed in the car doesn't mean the wiggling, jiggling and just hanging there didn't move things a tiny bit, I've seen it more than once. I always check it whenever you change a major component attached to it.
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Old 08-18-2010, 01:05 PM
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I will check for fluid coming out of the cooler lines with the engine running first, then unbolt the converter and see if it spins freely. Should the tranny fluid be circulating with it in Park or does it need to be in a gear?
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Old 08-18-2010, 01:20 PM
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Quote:
Originally Posted by rbomar
I will check for fluid coming out of the cooler lines with the engine running first, then unbolt the converter and see if it spins freely. Should the tranny fluid be circulating with it in Park or does it need to be in a gear?
Transmission fluid should be circulating through the cooler lines in park as well as in any gear .
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