aod shift problems

aight guys i have a 93 lx aod with a b&m hammer shifter 4.10 gears .

well the probles is that when i drive it first gear changes fine to 2nd gear also seems to shift fine but when i get to 3 rd gear it just wont shift rpms go up and doesnt shift to 3rd (well it might later but dotn want to force/put pressure on the trans)
and throwsback on the exhaust when i let go
my questions are the following

1.can i check/fix the tv cable? from a search it seems like that can be the problem.
2.what else can i check do?
3. im going to change tranny fluid and filter aswell.

some other info when i put it on 1 it runs good and also when i put it on 2nd but when i put it on D thats where the problem occors.

also the car seems to overheat when that happends.
 
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