2-3 flare up

[300kGN]

WE-4?
My trans has about 10k on a modified stock rebuild. Has a 10 vane pump, stalls around 2500. Everything was fine til I put in Art Carr shift improver(not upset w/AC-I should have left well enough alone. Shifted TOO hard with light throttle and very slow and soft WOT. AC rep said put a stock front pump relief spring in...did it...slight improvement but still backwards on the shift firmness. Took the kit out. Shifts ok but now it flares on the WOT2-3. The fluid is clean, doesn't smell burnt. Just wondering if I can do something to the 2-3 servo or band to fix this problem? Or did I screw up the order of something in the valve body?
Made 4 passes Saturday, 12:55-12.43. The problem didn't get any worse.

 

[chris718]

if this doesnt fix it there is an internal problemSHIFT RECALIBRATION KIT #24RSRK/A $129.00

The main focus of this kit is to reduce clutch and band slippage common with the factory hydraulic calibration.This easy to install kit includes all the necessary parts to recalibrate the hydraulic circuitry of the GM2004R transmission for high performance street and dragstrip usage.This is accomplished in many ways.New .500" TV boost valve,and .296" intermediate boost valves and a heavy duty pressure regulator spring significantly raise transmission mainline pressure to increase clutch and band apply pressures. A new AC/DELCO seperator plate is properly orificed to increase the flow of oil to the friction elements. Re-engineered springs for the accumulator valve,line bias,1/2 accumulator ,and 3/4 accumulator,and an updated 3/4 accumulator piston introduce a throttle sensitive accumulator and pressure rise system that meets the demands of high output engines.This reduces friction element failure and excessive heat build up during and after ratio changes.This kit allows the shifts to get shorter and firmer as the throttle is opened,resulting in clean ,positive gear changes at small throttle angles without the "bangs and clunks",and short firm shifts with larger throttle angles. Most kits do not have this feature engineered into them resulting in brutal part throttle shifts that beat and break internal components as well as generate many new drivability complaints.Hundreds of these kits are in use and this kit is recognized as the best of its kind.includes all the necessary gaskets and instructions.Please note that high performance applications will benefit from the use of a larger intermediate servo to multiply the clamping force applied to the intermediate band.If your transmission is not from an 86 / 87 Buick Grand National or 89 Turbo Trans Am which was factory equipt with a high performance intermediate servo assembly,the use of a high performance servo assembly should be considered.The following 2 kits include intermediate servo assemblies.