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MF 135 swap out 6 speed for 8 speed transmission?

J

Johnsdsl

New User
I have a nice 1966 Massey 135 Deluxe diesel with a 3x2 transmission. I'm enjoying it, but, you know, if I just had one more gear for bush hogging I'd have an even bigger smile. I know of a gas MF135 with a 4x2 transmission for cheap. Aside from splitting the tractors, is the 8-speed an easy, bolt-on swap? I'll assume my tractor has a rope seal and the newer gas tractor does not. Neither tractor has multipower.
 
Hi John,
It's an interesting prospect to change to an 8-speed box from the 6. I always felt that 6 speeds was not enough particularly when baling for example.
As always there are some 'buts'.

My info shows two different 8-speed boxes.
One is the 8-speed constant mesh (10 spline PTO plate and the other is the 8-speed constant mesh (25 spline PTO plate). In general in the UK 8-speed boxes were fitted to tractors with the 10/12" clutch. Before committing yourself you will need to ensure that a change of clutch plate/s will be available. The gearbox input shaft can have either 18 or 24 teeth on its gear depending on what tractor it has come from. The epicyclic unit at the rear of the box is the same as far as I can see.
If you can sort out any issues on the front side of the gearbox you should be well on your way.

DavidP, South Wales
 
If they both have live pto i believe it will bolt up, but here is the thing, a diesel 6 speed and a gas 6 speed have different gears, you pto gear ratios are different from a gas to a diesel. If you put a gas tranny on a diesel you diesel will be out of proper torque range with a gas tranny , you may not be happy with it... I am pretty sure it will affect you speed, even though you are gaining two more gears you may not be happy with the top end or the bottom end as far as mph
 
look up both on agco parts book online and compare them ,is there enough of a difference in the engine governor speed setting to have a difference between the gas and diesel gearing? as mentioned the clutches could have different amount of splines,but if i make no mistake the clutch disc will the interchange
 
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