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could be internal piston housing failure for the bands
pull the pan and see what metal is in the pan
there is an aluminium housing that breaks away from the transmission body proper and is replaceable
check the drain plug magnet for metal bits . If any the box has to come out 4.th gear is straight shaft connection and 5 gear connects from the cluster shaft up to the out put shaft . On either side is a rear main bearing and from your description if that bearing is failed then the 4th gear syncro will not align properly and the gear for 5th will be out of alignment so the syncro to work will not work
This sounds on the base of it to be pre ignition, if so the moment you take the foot off the gas it goes? The cure is to retard the ignition timing slightly, have you recently changed your octane of fuel? this will also cause this? The noise is caused by the expansion of the compressed gases expanding before the piston reaches top dead centre causing the piston to \'rattle\' left unchecked will cause permanent damage and engine failure
no 4-3 or 3-2 downshift uncontrolled downshifts outside range of kickdown switch poor acceleration from stopped position parking pawl will not engage selector lever does not engage in r or p engine will not start in p or n position smoke in exhaust (fluid loss) fluid loss between torque converter & primary pump howling noise when changing gears (under full load) howling noise which increases as engine rpm increases 1st gear & reverse too loud 3rd gear too loud rattling noise at 1500 rpm in all positions except r light grinding noise in p & n positions rolling noises when driving in reverse vacuum control circuit Vacuum Control Valve (E300D & S350D) Vacuum Amplifier (E300D & S350D)
I believe, you don't expect to get an answer from that question
It obviously has some damage, but we are like you,
just people spending time on the internet.
This is not a tech hot line, how could anyone guess.
You need the vehicle to examine it,I think you know that
It's weird but it's the problem!!! There is a switch on the transmission near the selector, usually only affects 3rd gear!!! The switch is being distorted after repetitive battering with gear selection!!! I have experienced it and also read about it in australia on a Navara!!!
That Thud is the Trasnfer Case for the 4X4. When Gears Break off inside this Transfer Case the Gears are So tightly Fit inside that the Pieces have nowhere to go but into the Other Gears Causing the Thud that you here. This is Causing Further Damage everytime you Here it. I would get the Transfer Case ReBuilt if you need the 4X4 at any time. Please Rate my Response, I need all the Help That I can Get! Thanks!
What do you mean by loud... Loud where??? If noise is from engine, make sure that the mechanical fan clutch is not "locked" (it's supposed to freewheel when cold... if it does not, it will "roar" when driving.
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