Internet access for remote site over dedicated T1 line w/ Cisco 1720s

Please Please Please help!!!!!

Site A has a Dedicated T1 Point-to-Point with Site B using cisco 1720
routers. Site A also has a cisco 2501 router for internet access.
Site A can get to the internet. I want site be to be able to use Site
A's connection to the internet through the dedicated T1. Check the
specs and tell me what I'm doing wrong:

Site A:
cisco 1720- WAN Serial0= 192.168.1.254
LAN Ethernet= 10.10.40.254

cisco 2501- LAN ethernet= 10.10.40.1

Site B:
cisco 1720- WAN Serial0= 192.168.1.253
LAN ethernet= 10.10.50.254

Now here's the real treachery. My SIte B router can only see (ping)the
Site A cisco 1720. My Site B clients, though can ping and see any
clients in site A but not the 2501 router in Site A. I've already
changed the default route to all possible options...Nothing. All my
traceroutes from Site B router stop at 192.168.1.254. My firewall has
given free roaming privileges to Site B (the 10... and 192...)...Still
nothing. What am I doing wrong? Am I missing a protocol? something
not enabled? If more info is needed please let me know. I'm drowning
here. I have decent working knowledge of networks but my cisco router
configuring is still young. Please, explain like I'm slow.
Thanks in advance

.

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