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BT 50 gearbox problems

Posted: December 18th, 2012, 1:09 pm
by ranger
here I am again...so bt50 4x2, mileage 124xxxkm...3rd gear not staying in, drives for a couple metres and the "jumping out" . anyone had this problem before? what can be the possible cause/s of this. thanks

Re: BT 50 gearbox problems

Posted: December 19th, 2012, 2:23 am
by sliderz1
how's the fluid?

could it be the fork?

Re: BT 50 gearbox problems

Posted: December 20th, 2012, 3:00 pm
by Cooper
^^ actually a manual transmission has multiple forks that hold & move a synchronizer collar between gears. In the Ranger/BT-50 there is one synchro for 1st & 2nd another for 3rd & 4th and another for 5th. In some transmissions, Reverse is engaged via an idler gear or may be on the opposite side of the synchro to 5th.

The syncro collar usually locks into place on a selected gear via three to four springs built into the collar or on a 'detent mechanism' that moves the forks. It could be that the springs are worn or broken.

ranger, when you move around the shifter (with the engine off) you would usually feel/hear a low click (sounds like a two solid bricks knocking together) when you engage the gears. That noise is the springs locking the collar in place on a gear. You would obviously have to apply a little extra force to move it out of the gear into neutral, because you have to overcome the force of the spring.

If you're not feeling this click for the 3rd gear, something may be wrong with the springs in the synchro collar/detent mechanism between the 3rd & 4th gear.

The springs don't generally break so there could be debris in the system from wear and tear on the gearbox

First replace the transmission fluid. The drain plug on the transmission usually has a magnet to catch filings but some synchros use brass dog teeth so it wouldn't catch all the metal.

IF that doesn't help, either find a transmission specialist to take the tranny apart and repair/replace the collar or detent spring or just replace the transmission altogether.


I know I may have gotten a little technical in that explanation but you can do a search on youtube on how manual transmissions work to understand exactly what I'm talking about.

Re: BT 50 gearbox problems

Posted: December 20th, 2012, 3:18 pm
by Cooper
This might help explain the problem


Re: BT 50 gearbox problems

Posted: December 21st, 2012, 7:55 am
by ranger
thanks Cooper...and yes there is some force to get third gear out....it sticking a bit...will get it checked out soon, I will report as soon as I find out whats wrong with it.

Re: BT 50 gearbox problems

Posted: December 23rd, 2012, 9:31 pm
by Mech Mines
hello the problem that your are currently having is that your 3/4 syn hub is broken. Its a common problem with these gearbox. This problem comes about when u dont replace your gearbox oil every 40000k. You can contact this person 3614048 in Penal on specializes in mazda/ranger gearbox and has all the parts for this gearbox new lower than the firm, he also gives 1 month warrenty.

Re: BT 50 gearbox problems

Posted: December 24th, 2012, 1:55 am
by black start
so both the automatic and manual transmissions have manufacturer's defects? real cool vid there cooler.

BTW, some gears are made of brass so that they would wear preferentially to the other harder gears.