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what is your O.S (solaris or aix or ?_)
with Gnu Sed
# val=9899
echo $INPUT|sed 's/\(._.\{8\}\).\{4\}\(_.*_\).*/\1'$val'\2/'
1_120606259899_3_4.5_
so it is
# echo $INPUT|sed...

what is the desired output ?
# echo $INPUT|sed -r 's/(._.{8}).{4}(_.*_).*/\19899\2/'
1_120606259899_3_4.5_

u can try this
# echo $INPUT|sed 's/\(._.\{8\}\).\{4\}\(_.*_\).*/\19899\2/'

use this


NEW_FILE=$(echo "$FILE" | nawk -F_ -v n="120606259899" -v OFS=_ '{$2=n;$NF="_";print}' | sed 's/__$//')

NEW_FILE=$(echo "$FILE" | nawk -F_ -v n="120606259899" -v OFS=_ '$2=n;$NF="_"' | sed 's/__$//')

FILE="1_120606259532_3_4.5_888"
NEW_FILE=$(echo "$FILE" | nawk -F_ -v n="120606259899" -v OFS=_ '$2=n')
echo $NEW_FILE