When I put the truck in drive or reverse the engine begins to bog down and when I take it out of gear to neutral the engine rpm's spike, I suspect that the torque converter is locked up again. This is the third one in three years. Can some one please tell me why my truck is eating my toque converters? transmission is 48RE with oem converter

no VIN 8th digit told.(engine)
well; if a tune up fails (spark plugs) and Spark COP boots.
then check fuel pressure by the book.
bogs under load,
stalls means engine stop spinning as in zero RPM./
loss of power or bogging , and not violent loss, means mostly fuel supply is weak. or low injector rail pressure found
a shop has the tool to do that, why not put them in the loop>?

10 Most Common Transmission Problems

www.transmissionrepaircostguide.com/10-common-transmission-proble...

Ever notice that while driving that the car hesitates or refuses to go into gear? ... For automatic transmissions, you might notice that when shifting into drive or park ....Neutral and park gears no problem, but drive, 1st, 2nd and reverse engages ...

Trans Goes Into Neutral While Driving - Transmission ...

www.transmissionrepaircostguide.com/topic/trans-goes-into-neutral/

Jun 5, 2015 - When I put it in drive, and begin to drive away the transmission will put itself in neutral. When I slow back down, it will go back into gear.

Check the fuel pump output. Some will work but not have enough output for the instances you describe. Find a place that can test the fuel pump pressure.

what counts is ENGINE RPM.
see?
i put shifter in REV.
i do the stall test in the FSM, or at alldata.com
the stall test is brake hard sat and advance throttle with right foot for 5sec max, what is RPM????
if its very very low RPM that is a weak engine, but will not that, because car drives perfect in forward gears.
if the RPM shoots why to high (read the page) 2500 is like max,IIRC.
that means REVERSE slips.

ever try a new tranny filter. or better a full flush and new filter?
ever 50k?
amazing things happen , it last 2 times longer.

hell do the stall test in all gears, takes what 1min?
and see the book , on spec.
alldata.com
or the real FSM
get one, and win.
see it here, in 1st.
this video use the A/T tranny to test a good MAF.
http://www.fixkick.com/videos/FLV-all/showtime.html#MAF

this test is classic test on all trannys, in all FSM of ever car (non CV)
note the rpm in top right corner, and it ends at 2000 rpm
this proves 3 things
1: engine has full power
2: tranny dont slip in 1st.
3: the MAF is at full output and good, (ignore this for now)

then brakes are had set. and chocks on tires.
the engine and tranny be come like a dyno test.
the FSM cover this is vivid details on 1st and reverse.
and the solutions.

Your car is probably in the limp mode meaning it won't allow you to rev the engine with it in gear. I suspect something majorly is wrong with your tranny. Limp modes are put into effect when you car senses trouble so it may still be fixable without too any $$$. When was the last time you serviced the transmission ( oil and filter change?)

that should not effect the driving of the car,it's do to the loss of connection in the gear shifter.

You can spin the duallys in reverse because reverse is a MUCH lower gear. NO, there is no kickdown cable for your transmission. Your transmission is controlled electronically.
If the engine is bogging down or if the transmission is trying to start up in the wrong gear, either the check engine light should be on or the O/D OFF light should be flashing. The best course of action in diagnosing a problem with a computer controlled engine and transmission is to scan the computers that control them to check for fault codes.

ask a local mecahnic to have a look ,i suspect a internal fault in the gearbox like the reverse idler catching another gear which is caused by worn selectors but without a drive i couldnt tell you but a local mechanic can

with driving with the check engine light flashing u may have done damage too the catiltic converter check that when u reve the engine there is alot of exhaust flow it should push your hand from the tail pipe (be carefull exhaust will be hot)
It would be helpful if u could list the codes you can buy a code reader from any automotive parts store relitvly cheap