I was surprised the tractor is back. Nothing wrong with it; just in for routine service and it runs very well. Turns out the owner's neighbor wanted to purchase the tractor but didn't decide quick enough he wanted it. The current owner purchased it and traded in an older Ford tractor at this distant implement dealer so it is back in this area.

  

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DrAllis wrote: The Cummins 5.9/12Valve that we put in my brothers 7020 had the "VE" pump on it. With the high idle at 2500 RPM, pulled down to 2300 rated speed for the 7020 chassis, we had 135 HP. Perfect. When I pulled it on down to 2000 RPM, I got 180 HP  !!!  Tremendous torque build up  !! A really nice 450 bushel corn hauler in 6th gear PST any hill we have and no need to ever downshift.

Thanks DrAllis for sharing about your brother's 7020 recent 5.9 upgrade features/figures. Also enjoyed watching your progress thru it's engine swap. Yes, the 5.9 cummins is a remarkable workhorse. Not to bash the AC 301 or 426, but IMO the 5.9 cummins in the AC 7010-8070 units should have comparable torque at improved fuel efficency.  I realize the AC 4.9 301 is not an exact comparison to the 5.9 cummins. And the AC engines are 28-40 years older.  You mention your brothers 5.9 7020" improved torque, but what have you noticed of it's fuel economy versus the AC 4.9 301? 

Here is a conglomeration of specs that I found online per some independent websites. A few sites listed Dodge Ram's hp/torque specs versus years, pumps, turbos, etc...  Other site's listing is more generic (cylinder bore/piston skirt diameter, bolt torques, etc..).

Length    40.0"
Width    24.9"
Height    37.9"

Weight   1000-1100 lbs

Compression Ratio    17.0:1 - 17.5:1

Bore/stroke   4.02" X 4.72"

Main bearings  7

Firing order    1-5-3-6-2-4

Cylinder bore inner diameter:     102.116 mm (4.0203 in)
Piston skirt diameter     101.880-101.823 mm (4.011-4.0088 in)
Piston ring end gap:     First     0.400-0.700 mm (0.0157-0.0276 in)
                              Second     0.250-0.550 mm (0.0098-0.0217 in)
                                     Oil     0.250-0.550 mm (0.0098-0.0217 in)
Piston pin outer diameter     39.990 mm (1.5744 in)
Connecting rod small end diameter (standard):     40.042 mm (1.5765 in)
Crankshaft main journal diameter:     82.962 mm (3.2662 in)
Crankpin diameter:     68.962 mm (2.715 in)

1989-1993    160 hp @ 2,500 RPM  400 lb-ft @ 1,600 RPM

                    Bosch VPE44 Rotary, Holset H1C, non intercooled(89'-91')

                    (91.5'-93) waste gated version Holset H1C, air-to-air intercooled.

                    A727 3 speed heavier-duty version automatic transmission.

                    Manual 5 speed was offered, but hp settings remain @ 160hp.

1994-1995    160 hp @ 2,500 RPM (auto) 401 lb-ft @ 1,600 RPM (auto)(Bosch VP7100)

                    175 hp @ 2,600 RPM (manual) 420 lb-ft @ 1,500 RPM (manual)

                                                   Holset WH1C, air-to-air intercooled

                    47RH auto & NV4500 5-Speed manual

                    Piston fuel-bowl new design provided better swirl and 

                    improve overall combustion quality and

                    made of highly temperature-resistant aluminum alloy.

1996-1998    180 hp @ 2 ,700 RPM (auto) 420 lb-ft @ 1,500 RPM (auto) (Bosch VP7100)

                    215 hp @ 2,700 RPM (manual)440 lb-ft @ 1,500 RPM (manual)

                                 Holset HX35W or HX35, air-to-air intercooled(holds 40psi boost).

Main bearing cap tightening procedure and torque specs:
        Step 1: 60 Nm; 6.0 kg·m; 45 ft·lb
        Step 2: 119 Nm; 12.0 kg·m; 88 ft·lb
        Step 3: 176 Nm; 18.0 kg·m; 129 ft·lb

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
Connecting rod bearing bolts
        Step 1: 35 Nm; 3.5 kg·m; 26 ft·lb
        Step 2: 70 Nm; 7.0 kg·m; 51 ft·lb
        Step 3: 100 Nm; 10.0 kg·m; 73 ft·lb

Flywheel fixing bolts
        137 Nm; 14.0 kg·m; 101 ft·lb

    

Head tightening procedure and torque specs:
        Step 1: 90 Nm; 9.0 kg·m; 66 ft·lb
        Step 2: 120 Nm; 12.0 kg·m; 89 ft·lb
        Step 3: Turn all bolts 90°

Valve clearance (Cold)
Intake valve     0.25 mm (0.010 in)
Exhaust valve     0.51 mm (0.020 in)

Really don't know much more than that but going to tear it apart fully, price parts and labor, then compare to used replacement, or reman exchange.

Hope to know more in the upcoming week. So far, it looks bad however. Never been into a tractor transmission myself but have rebuilt several light and heavy duty manuals over the years. They have the books and were ascertaining how it comes apart when I left. 

One of the guys bumped a set of snap ring pliers setting on the case and they disappeared between the countershaft and gear case. My arms are small enough to get inside there and man is there a lot metal pieces where they shouldn't be..... 

That Cummins engine was originally a low power variant from an FL-60 Freightliner truck. The tag has 152hp stamped into it, but it's been "turned up" in power I'm told. I still see the original owner every now and then and will ask where it's calibrated at now.