I think I am having a problem with my transmission shifting. The car is 1973 ply scamp with a SL6 and an A904 transmission. I noticed on the highway it seemed to be dragging and I noticed when I take my foot off the accelerator it slows downs as if I’m in the wrong gear. I checked the service manual for shift speeds and it states 1st to -2nd @ 9-13mph and then 2nd to 3rd @ 14-17 mph. I took it out and it feels like it shifts at about these speeds but still drags on the highway at 60 -70 mph. I then hooked up my tachometer and it reads 1st - 2nd at 1500 rpm and then drops after the shift to about 1300 rpm. 2nd – 3rd 1800 rpm then drops after the shift to 1500 rpm. At this time I am going about 35 mph and as I accelerate to 60 -65 mph the rpm’s creep up to 2200 -2550. This does not seem right. Shouldn’t the rpm’s be about 1000 -1500 after all the shifts? Any thoughts on what’s wrong or how to adjust?

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Thanks

Bruce
'73 Ply Scamp 225 1bbl

Sounds perfectly normal to me. Once the transmission is in high gear you have to increase engine speed to increase vehicle speed.

How's the acceleration and fuel economy?

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Joshua

Thanks I guess I thought the RPM's would drop to about 1500 or so on the last shift and stay there but I suppose your right once in the last gear at 20 MPH then the RPM's can only go up as speed increases. I still don't like the big drag I feel when I let off the gas at 65 MPH. The acceleration is not great a little sluggish. And for fuel economy the MPG is about 14 -16.

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Thanks

Bruce
'73 Ply Scamp 225 1bbl