Spicer 5 Speed in an A3

simp5782

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MD3060 size is 33.2 inches front to rear and 12.8 inches deep on the PTO drive gear @ 575lbs.

without the pto attachment is it 29.2 inches long and 12.8inches deep @ 535lbs.

The MT643 is 30.4 inches long, 19.3 inches wide and 22.4 inches tall and weighs 510lbs without the retarder.

It is pretty hard to kill the MT643, they will even run when they are coming apart internally. Yes the direct drive is a burden in 4th but they are cheap and easily found. You can buy 3 or 4 of them @ the price of one MD3060. There is a guy in MN and another in OH that can do some tricks to the 643 to get a little better 4th gear ratio. The 643 also has a GVW limit of 72k compared to the MD is in the 50k range I believe.

You can also go with a spicer 4054 transmission in an A3 with the SAE 2 bellhousing, flywheel in pics and a 14" disc. It is a direct drive 5th gear as well. I think I know where a clark is with a .88 OD but not sure ill have to check

The MD3060 uses all the same parts to bolt to the engine that the 1545/545/643 would use. It is just electronic though.

I have a worked used MD3060 in my garage with less than 60k on it with the computer and harness for $2500 shipped to a terminal.
 

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simp5782

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electronic trans = shifter control & ecu + programing = $$$$$$$$ plus the md3060 has no pto, then you may need md3060p = huge.

Why would you need a PTO on an A3? The winch is hydraulic. Also you can add a PTO. Ive got 6 of them for 2000/3000/4000 series world transmissions that are brand new. $150 shipped ea.
 

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jaymcb

New member
MD3060 size is 33.2 inches front to rear and 12.8 inches deep on the PTO drive gear @ 575lbs.

without the pto attachment is it 29.2 inches long and 12.8inches deep @ 535lbs.

The MT643 is 30.4 inches long, 19.3 inches wide and 22.4 inches tall and weighs 510lbs without the retarder.

It is pretty hard to kill the MT643, they will even run when they are coming apart internally. Yes the direct drive is a burden in 4th but they are cheap and easily found. You can buy 3 or 4 of them @ the price of one MD3060. There is a guy in MN and another in OH that can do some tricks to the 643 to get a little better 4th gear ratio. The 643 also has a GVW limit of 72k compared to the MD is in the 50k range I believe.

You can also go with a spicer 4054 transmission in an A3 with the SAE 2 bellhousing, flywheel in pics and a 14" disc. It is a direct drive 5th gear as well. I think I know where a clark is with a .88 OD but not sure ill have to check

The MD3060 uses all the same parts to bolt to the engine that the 1545/545/643 would use. It is just electronic though.

I have a worked used MD3060 in my garage with less than 60k on it with the computer and harness for $2500 shipped to a terminal.
I'm sure I am missing something, but is the 4th gear in the MT643 a 1:1 AND the 5th gear in the MD6030 also a 1:1? If so, how does that improve the 1:1 in the transmission that come stock and has a final gear of 1:1?
 

simp5782

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MD3060:
1st 3.49
2nd 1.86
3rd 1.44
4th 1.00
5th .75
6th .65
Rev 5.03

MT643 :
1st 3.58
2nd 2.09
3rd 1.39
4th 1.00
Rev 5.67
 

simp5782

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On a spicer 3053A you are looking at a .85 5th gear ratio compared to a .75 in the B model.

Spicer 3053A
1st 6.00
2nd 3.31
3rd 1.89
4th 1.00
5th .85

3053B
1st 4.50
2nd 2.50
3rd 1.50
4th 1.00
5th .75

Some of the gears like on the 5 ton transmissions just leaves a big lagging gap.

The spicer 4054 is direct drive 5th
1st 7.22
2nd 3.88
3rd 2.31
4th 1.42
5th 1.00
 

quickfarms

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How much better can they make the final ratio on the mt643?

My truck does 55 mph at 2400 rpm I would like to get a little more out of it without running on the governor at 2800 rpm
 

m-35tom

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1: you cannot just add a pto on a md3060, there is no place for it. you must actually change the transmission to a md3060p.

2: a md3060 is a 6 speed and 6th is .66 od or .5:1

3: as everyone now should know there is NO .85 od 3053. that was a misprint a long time ago and comes up often, but is not true.

4: .86 od in a mt series would just be a waste of time it is so little you would miss it.

5: the 3053 is a sae3 size, what is the 3116 in the a3? if it is also sae3, all you need is a flywheel and that should be fairly easy even if you had to make one. G. what material is the multifuel, cast iron or steel? if it was steel it could be moded to fit the cat?
 

trukhead

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I was thinking that a eaton fuller 9 speed might work looks to be about the right size and some I have talked to say it would bolt to the cat 3116.2cents
Their fun to drive as well, don't need the clutch all the time, and the little cat would sound nice gruntin at lower rpm's in overdrive of the tranny. I thnk fullers have some overdrive ratios in them somewhere.
:D
 

gringeltaube

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.....what material is the multifuel (flywheel), cast iron or steel? if it was steel it could be moded to fit the cat?
It is cast iron and 17-1/2" O.D.; you would have to remove a ton of material and adapt a smaller ring gear to make it fit into a SAE#3 housing. (for that size I have used/ modified M35 gasser's flywheel & clutch...)

G.
 

m-35tom

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actually i remember now that i think the cat is sae 2 same as multifuel (even though the multi is not true sae 2) and uses similar adaptor ring.
 
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