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GM has a service bulletin regarding harsh upshifts from 1st to 2nd gear on Astro Vans (and similar GM vehicles). They say the problem typically occurs for vehicles with greater than 32 thousand miles on them. They recommend installing a control valve body with the revised TCC regulator and isolator valves. I just had this done to my 1999 Astro and it solved the problem.
Alternatively, Sonnax manufactures kits which correct the problems on the TCC Reg. & Isolator valves. If a transmission shop finds the control valve body to be the fault of your problems, discuss this option with them as it will be significantly less expensive than a total replacement of the control valve body.
However, before assuming a worst case scenario with your transmission, always be sure to check the Transmission Fluid levels. If possible, drop the pan, drain the fluid, replace the filter and fluid. If this doesn't alleviate the problem, then it would be prudent to take the vehicle to a reputable transmission shop to have it professionally diagnosed.
*Note: The service bulletin was only regarding '97 and later models, as they seem to be plagued by this issue. It is possible, however, that this defect is also present in earlier models.
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