It is not clear whate version of software - for 8.43 see my opinion below.
Not sure what you mean by 3825 and 3750. I will assume users attempting to access a server behind the ASA (coming in on port 3825, and you need port translated to 3750 for server ingress-use.).
1 ACL - optional
a. create object for server (if need an acl to limit users)
b. identify service objects (if need an acl to limit users)
c. create acl rules on outside interface (if neeed acls to limit external users access to server)
2. NAT
d. create nat for external users to access server via object rule.
nat (inside,outside) static interface service tcp 3750 3825
access-group outside_access_in in interface outside