[racerfoo]

ok i've got a stock automatic tranny on my 350 and i put in a 2500 stall and well it seems like it shifts WAY too soon. i floor it and it will start to go then right where it seems to begin to hit the powerband it shifts and i lose RPM and power big time. i can manually do it, but is there anything that i can do or anything that needs to be fixed so that it will rev up to closer to redline when i get on it? thanks

[racerfoo]

anyone?

[ZZ430DropTop67RS]

You could try an adjustable vacuum modulator.

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Don~ ZZ430DropTop
~~~~and~~~~
70 RS/Z28
67 RS/SS Convertible, 70 RS/Z28

[68rs406]

it may already be an adjustable mod. i think they usually have an orange stripe around them. pull off your vac. line and see if there's a flat blade screw in there(w/a little screwdriver), if there is, its adjustable, and you should be able to get shift point dead nuts. if not, get one, the're pretty cheap.

[travis]

Usually those adjustable vacuum modulators can only adjust the shift point by a few mph...doesn't sound to me like that is what you are looking for. Is your tranny kickdown linkage hooked up and adjusted properly? If so, I think the next step is something like a B&M shift point adjustment kit. I believe you can add this without dropping the tranny or spilling a drop of fluid. It consists of different weights and springs for the governor that controls the shift points. If I remember correctly, they are under $50.

[70Coupe]

One thing to remember about stall converters - torque determines the stall speed. If you don't have much torque, the stall will be lower, almost stock. If you have a lot of torque, the stall will be higher. Maybe you don't have as much torque as you thought.

[68rs406]

i dont want by any means to start anything, but i have a TH350 w/ a part. manual valve body(no kickdown,but it will shift automatically) and a 3300 stall and adj. mod., and i can adjust it from shifting almost immediatly to wondering if its gonna shift at all, nothing personal though, travis!

[boodlefoof]

My first thought would be the kickdown linkeage.

[travis]

<BLOCKQUOTE>quote:</font><HR>Originally posted by 68rs406:
i dont want by any means to start anything, but i have a TH350 w/ a part. manual valve body(no kickdown,but it will shift automatically) and a 3300 stall and adj. mod., and i can adjust it from shifting almost immediatly to wondering if its gonna shift at all, nothing personal though, travis! <HR></BLOCKQUOTE>

Thats interesting...I have an adjustable unit on mine (2000 stall) and it makes very little difference in the shift point. Do you remember what brand yours is?

[racerfoo]

oh and also, now that the put the new tranny in, it wobbles big time. like it feels like a wheel in front is about to fall off or something, but thats not the case i dont know what is making it wobble. could it be something with the driveshaft when they hooked it up or what? any ideas? i have 355 tires on back and air shocks raised up so it doesnt rub too.

[68rs406]

travis, strange, i dont know what type of mod. mine is, the guy who built the tranny put it on. i think it has an orange stripe on it, but i havn't been under there lately(luckily! ) the guy who built it is a local guy, does a lot of trannys for my buddies and local drag cars. out of his house! it's a pretty bad-ass tranny. racerfoo, what part moves around like your'e describing? something does'nt sound right.

[BreathWeapon]

About the "wobble", is it an intense vibration? Failure to synchronize the yokes of the U-joints would make for a horrific shaking of the vehicle (not to mention very short U-joint life). I doubt a qualified shop would do this, but back yard mechanics sometime do it, lol.

If it honestly feels like a wheel is about to come off, it may be wise to have a buddy lean out the window as you drive down the road to see if there is a wheel that does indeed wobble.

I really need to know just what this "wobble" feels like in order to even begin guessing accurately, can you be a bit more specific?

[HwyStarJoe]

Maybe the transmission mount is either loose or broken. Check it at the crossmember.

[Eric68]

<BLOCKQUOTE>quote:</font><HR>Originally posted by travis:
Thats interesting...I have an adjustable unit on mine (2000 stall) and it makes very little difference in the shift point. Do you remember what brand yours is?

<HR></BLOCKQUOTE>

Ditto . . . please tell me what brand too - I have one with an orange stripe and is has about a 10 mph range total. Mine shifts too soon in drive for my liking.

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68 Camaro, 383 small block with TH350 trans. 11.98's at 111mph and never trailered.

[68rs406]

ill climb under my car this weekend and see what i can find out.its been several months since i put my converter in so i havnt messed w/ the tranny since then. im sure i was able to get more than 10 mph variance, but i could be wrong. i know i played w/ the shift points after i put the converter in, and could for sure make a big "seat of pants" diffrence.