Expected Lifespan / Troubleshoot Question

[rangerpilot]

What is the expected lifespan of a rebuilt/remanufactured manual transmission?

Additionally, is there anything I should do to prolong the issue with my truck slipping out of reverse on a regular basis (unless I hold a slight amount of pressure on the shifter)?

1999 Ford Ranger 4.0 V6
278000 miles on truck
~ 100000 miles on rebuilt tranny
~ 35-40000 miles on the clutch/slave


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[wildbill23c]

Other than making sure the transmission is properly filled with oil there isn't much in the way of service on them. Don't drive in overdrive when towing heavy loads, don't be shifting gears without the clutch...its cool but your transmission's syncros will wear out faster.

As for the popping out of reverse issue, never really knew what caused that, I had an 89 Mazda b2600i 4x4 that did the same thing, I just kept my hand on the shift lever as a result, and at 389k on it, I couldn't complain LOL.

 

[RonD]

If kept filled with ATF it will last the life of the truck, yes manual trans, uses ATF
That's a new M5OD-R1

Rebuilt will depend on the shop that did the work, if trans failed because of low fluid then as long as you keep it filled it will last the life of the truck.

If it failed for another reason, bad casting or part, and that wasn't repaired then it will last as long as it did the first time

M5OD-R1 has 3 rubber plugs at the top rear, these leaked, and caused low fluid levels, overheating, and failure of trans.
Most shops will replace these with metal plugs, that needs to be done.

Popping out of a gear usually means there is end play on a shaft or gear.
Angle cut gears are used because they are quieter than straight cut gears.
But angle cut gears push the gears themselves and shafts forward or backward when engaged, so they are shimmed to reduce this movement.
If there is too much movement it "pops out of gear"
Holding the shifter keeps the Dog Gear pressed against reverse gear, in this case, so it can't be push out.

It could also be the shift fork is not fully engaging Reverse, slightly bent, not pushing Dog gear fulling into place, so the torque pushes it out.

 

[AllanD]

Actually this could be simple to fix...

Reverse/5th is actuated by a fork on a rail inside the trans

That fork is pushed by a lever that is on an adjustable pivot...

IF whoever worked on the trans last loosened up that big torx nut on the side of the trans
that pivoting lever may be out of adjustment...