Uncertainty about lines of succession at Bankers Trust New York Corp.  has sent its stock into a two-day slide. 
The price of Bankers Trust shares dropped $1.25 Wednesday after chairman  Charles S. Sanford's unexpected retirement announcement. The share price   continued to fall Thursday, closing at $57.50, off 50 cents as investors   pondered the implications of his departure.     
  
Although Bankers Trust said its chairman's retirement by midyear 1996  had been expected, many observers were jarred because the bank failed to   name president Eugene Shanks as his successor.   
"If Shanks was appointed, it would have been business as usual," said  analyst George Salem of Gerard Klauer Mattison in New York. 
  
The failure to name him, Mr. Salem said, "implies bringing somebody  different in, somebody with a fresh, clean perspective and probably a new   plan to reenergize Bankers Trust. To me, that means a potential for turmoil   in the organization."     
One analyst, Francis X. Suozzo of S.G. Warburg & Co., concluded that  under new management Bankers Trust's $4 dividend might be cut in half. His   report prompted some of the selling Wednesday.   
Mr. Sanford's resignation came at the end of a difficult year for the  bank company, which the chairman has positioned as a derivatives trading   powerhouse. Bankers Trust has been sued by clients whose derivatives   contracts with the bank soured when rates rose last year, and the bank was   fined for alleged deceptions in marketing the products.       
  
These troubles were capped by a $157 million first-quarter loss.
The latest selloff of Bankers Trust stock, which traded for as much as  $84.25 a share before last year's collapse, came despite predictions that   the trading environment is about to bounce back.   
Ronald Mandle, banking analyst at Sanford C. Bernstein & Co., rates  Bankers Trust a "buy," saying its stock is "reasonably valued" for the   intermediate term and positioned to benefit from a rebound in trading.   
Although he acknowledged that the retirement announcement created some  uncertainly, Mr. Mandle said Bankers Trust will likely stay on the same   strategic course.   
  
"I think there'll be some shift, to focus more on overall  relationships," he said. "I don't think you're going to see radical near-   term changes."   
Raphael Soifer of Brown Brothers, Harriman & Co. agreed that the board  appears committed to the general strategy Mr. Sanford has laid out. He   added that Mr. Shanks could still eventually be named chairman.   
But he said he is not about to change the "neutral" rating he gave the  stock after the first-quarter results. "It would be very difficult to   recommend a stock for the long term when you don't know who the CEO is   going to be," he said.