I have a 2004-r in my '69 Firebird, and overall it does all the things I expect of it considering the 4.56 gears in the back. It shifts are reasonable spots considering the rear gears, and the shift quality was good, it shifts firmly, even chirping the tires going into second which I expected it to do given the shift kit, but I've injured the trans, so I'm pulling it apart in the next couple weeks and would like to address an issue it's always had while I have it apart fixing another issue.
What my problem is, when shifting manually there is a decent time delay between when I move the shifter and the transmission actually changes gears, but only really noticeable on the upshifts. It seems to respond to the manual downshifts just fine, but the manual upshifts hesitate and then of course over rev's the engine from the point I was intending the shift. If I had left the shifter in Overdrive or Drive, it would have shifted a 1,000+ rpm earlier, so I wouldn't think it'd be the TV cable adjustment.
What effects the response time of the manual upshifts? Is it pump pressure? A hole in the valvebody plate? Any thoughts on additional modifications to the valvebody or pump? I don't want a full manual valvebody, but I want the hesitation gone out of the manual shifting.
What my problem is, when shifting manually there is a decent time delay between when I move the shifter and the transmission actually changes gears, but only really noticeable on the upshifts. It seems to respond to the manual downshifts just fine, but the manual upshifts hesitate and then of course over rev's the engine from the point I was intending the shift. If I had left the shifter in Overdrive or Drive, it would have shifted a 1,000+ rpm earlier, so I wouldn't think it'd be the TV cable adjustment.
What effects the response time of the manual upshifts? Is it pump pressure? A hole in the valvebody plate? Any thoughts on additional modifications to the valvebody or pump? I don't want a full manual valvebody, but I want the hesitation gone out of the manual shifting.
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