Thread: LT95a + 4BD1T towing 3300kg stuck in 3rd gear temporarily

Were you on the flat when trying to pop it out of third?

Originally Posted by justinc

Were you on the flat when trying to pop it out of third?

Not at first. I coasted about 1km while I'm working the shifter, using the throttle to induce backlash- not heavily. I figured that the jolt might encourage it to give me neutral.

Similar thing happened to me ehen i spent a day idling around in 2nd and 3rd low. Had some big problems getting gears until the next morning when the box had cooled off. A few notchy shifts during the day especially into 3rd and 4th but then all ok. I changed the oil when i got back from the trip and it was fine afterwards.

Jc

Whilst I haven't experienced this myself about the only thing I can think of that would cause this is input shaft endfloat. When you are going downhill using enginebraking the load on the gears and synchro hub is reversed (that is the load is driving the engine through the t/case and gearbox instead of the reverse happening under power). If the input shaft bearing is loose in the housing it can make it move enough to put some pressure on the 3/4 synchro hub inner and possibly move it a little tighter against 3rd gear. Bent input bearing lock tabs or wear on the cover plate are usually what causes the endfloat. One way to check if you have it is alternate between on and off the throttle while holding your hand on the gearlever. If it moves it indicates some endfloat. If it still feels ok and doesn't give any more problems I would keep using it. See what the oil and the magnet look like next time you change it.

Good point Brian. A year later when i did the TRB conversion i removed and stripped the transmission and yes the input bearing retainers were bent... possibly the reason it didn't reappear was due to it being used for light duties after the initial trip...

JC

Originally Posted by Bearman

Whilst I haven't experienced this myself about the only thing I can think of that would cause this is input shaft endfloat. When you are going downhill using enginebraking the load on the gears and synchro hub is reversed (that is the load is driving the engine through the t/case and gearbox instead of the reverse happening under power). If the input shaft bearing is loose in the housing it can make it move enough to put some pressure on the 3/4 synchro hub inner and possibly move it a little tighter against 3rd gear. Bent input bearing lock tabs or wear on the cover plate are usually what causes the endfloat. One way to check if you have it is alternate between on and off the throttle while holding your hand on the gearlever. If it moves it indicates some endfloat. If it still feels ok and doesn't give any more problems I would keep using it. See what the oil and the magnet look like next time you change it.

Thanks Brian & Justin. The oil change I will do...It is an AFM box. I've done the gearbox oil twice already just to check what was living in the gauze filter and on the magnet- turned out to be a waste of oil (still good with no metallic elements being present).

Thing is- those input bearing lock tabs are more than likely bent.

I think I did this on 1st insertion of the engine where the clutch was not perfectly aligned and I attempted to mate up engine to bellhousing with extended bolts.

So it will have to come out possibly sooner than later- but I still have one more heavy load to tow- this time from the back of no-where to home.


In regards to movement of the shifter rocking under power (on and off the accelerator)- there is no movement on the 3 / 4 plane, but there is mild perceptible movement at 2nd if I hold the shift- very mild but still present.


mmm...Should I risk doing the next load...

The only thing i noticed was the the baulkring 3rd to 4th was badly unevenly worn due to the end float and misalignment. Other than that i just replaced input brg and baulk rings throughout and bunged it back together.


Jc

Originally Posted by Svengali0

mmm...Should I risk doing the next load...

I'm sure another load or 10 won't make it any worse!