I would check the address you had coins in first on a block explorer to make sure its still in that wallet.
besides that it should be as simple as starting a new client with the old wallet.dat and it will update with the new chain after download.
do you have the address that your coins are held on?
I have new wallet, synced, but balance shows 0.00LTC
I dont have address that is used for receiving funds.
I have tried all addresses from test1.txt on
http://explorer.litecoin.net/ and every time I got message - Address not seen on the network.
I have lost over 20 hours doing something I dont know, I would rather give 1LTC for 1 hour work to someone who knows.
thanks