Is something broke?
I have a 700R4 tranny in my 82 Z28 When my car shifts from first to second under any type of acceleration it spins the tires, hard acceleration it spins them hard, light just chirps them. When this happens especially under hard acceleration the tire spinning is accompanied by a loud banging noise which sounds like it's coming from the rear axle .(not inside the axle, but more like the axle is trying to move) In addition to the noise and tire spinning the car feels like it's trying to jump to the driver side and kind of like the passenger side rear tire is trying to push itself backwards. The total effect is that under hard acceleration from first to second the tires spin, you hear a loud bang your head is whipped just about into the window and it feels like the passenger side rear tire is trying to push backwards. This is my second rear end, I blew the first one up.


Thanks Silkworm

 

Maybe that banging you're hearing is a broken transmission mount? I'm not sure about the rear end swinging like that during shifts, but it sounds like the ladder bar or something may be loose. I'd get under there and check everything over... Let us know if you figure that out, sounds interesting...

 

I have already replaced the tranny mount, i'm going to be putting in new Lower Controll Arms and Relocation mounts, hopefully that will help

 

How about your panhard bar? Is that in there ok, are the bushings ok?

 

someone i know had an adjustable shift kit in their tranny and when it was on the most agressive setting it did the same thing...she couldnt accelorate at all without spinning the tires in like all gears. do you have a shift kit in your trans?

 

Yes i do have a shift kit, or rather the shop who built my tranny said that there is a shift kit for first and second, and a seperate one for third and fourth also race clutches, new B&W band?, corvette servo 10 vane pump all new bushings and new sprag gears amongst other things

 

you may have to take off ur trans pan and see if there is an adjustment for the shift kit

 

I would check your TV cable adjustment. Too far in and the pressure raises causing firmer shifts, however it has to be certain way in order to allow proper line pressure.