Multi-Power.

In most models, low MP has one set of gears driven through a sprag clutch (over-running) and another set of gears with a faster ratio that are engaged by means of a hydraulic clutch pack. That is why the tractors free wheel downhill in low and engine brake in high. That is also the reason high doesn't work if there is a hydraulic problem.
 
The low side of the TA does use a Sprague clutch, while the MF models use a jaw style clutch that I've never seen fail. The two systems are similar in operation, but high hour TA can suffer low side failures..
 
In the 15 years i've been a farm mechanic I've seen many more TA's out than the multi powers- major reason I see for this is that the TA
is a dry clutch and the Multi power is cooled by the hydraulic oil. That being said- the early multi powers used a fiber style disc that
was known for "delaminating"- later versions and replacement discs are semi-metallic. I've seen multi powers hold up to about 450hp on an
1150 and not slip, they're tough.
 
if you have young folks driving the MP transmission, they will free wheel down a hill.
in low range mp I think,

if the kids do not know this, it can be dangerous.

I have driven one with high range out, only low range, brakes in poor working order.
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not to run them down, as I enjoyed using a MF with MP and brakes working properly.
 
We had several MF tractors over the years, most of which had Multipower. The only IH we ever had fitted with a TA was nothing but trouble.
 
I's sell my tractor in a instant if I could find one with multi power. The old standard 6 speed to me never seems the right ground speed for whatever I'm doing.
 

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