th350 doesn't like to shift especially into 3rd.

[280zwitha383]

This corvette is going to be the end of any financial prosperity I would ever hope for. Anyway, I'm pretty sure the engine is not making power up to par however once the transmission shifts it has enough power to accelerate moderately in 3rd. I haven't hooked a tach up to it but it has a 3.08 rearend from what I can tell from spinning the wheel/watching the driveshaft and it has 255/70?/15 wheels on it. I don't know if those are stock but they look huge on the car. ANYWAY, the transmission will take off in second unless you get on it right off of the line which seems strange to me. So you're going in second for forever with the engine making the old WHHHIRRRRR sound. Then it will shift after seemingly an eternity but probably only say 5 seconds. It will also shift if you let off of the gas a good bit. 1st to second is not as bad but like I say to get it into 1st you have to get on it or manually put it in 1st. Now what gets me about this thing is that if you're cruising around 55 (can't tell for sure because the speedo doesn't work despite having the cable hooked up...) it will quickly kick into 1st and off you go hardly any slipping or anything. Now, I THINK I have the proper level of fluid in it. The dipstick that came with it is a different length than the other ones I have but I tried to go off of the split where it stabilizes itself in the tube (does that make any sense to anyone, I looked for a picture on google but nada. Maybe I'll have to take one myself) and line that up with the split on the longer dipstick I have. I know for sure that I've ran it with too little fluid and it did the same thing. Last time I think I added 3? additional quarts to it because it was leaking out of where the speedo cable is (somebody doesn't know what it feels like when you're cross-threading things). This thing did sit for a while with too little fluid in it so I don't know if that would have ill effects on the cluthes or whatnot. Also, the kickdown cable has proper movement at the throttle and the transmission as well. I have tried blocking off the brake booster and the pcv with the same results. For some reason this holley carb doesn't have the usual large port up front for the pcv so the booster, pcv and tranny vacuum all are run into the same thing. I have tried it without the vacuum hooked up at all and with the vacuum hooked up to the non-ported port where some people would hook the vacuum advance of the distributor. It really didn't want to shift with the vacuum not hooked up at all which was expected but it didn't have the usual action I'm used to them having, like when an appropriate time to shift comes along you can move the shifter from whatever gear you're in to the next gear and the transmission will shift. Now as you may have already realized I know next to nothing about transmissions so any insight would be great. Thanks.

[280zwitha383]

Nobody's got any ideas? I haven't messed with the car in maybe a month but I'm curious if maybe it's just that the engine isn't making enough power or vacuum???