Looking at various 617 into Land Cruiser projects, I wonder if a 603 would be happy hauling a 2WD Suburban. This would be a people mover, not a work or tow vehicle. Is a 722.3 up to the task?

Sixto
87 300D

It might be a little short on torque unless you messed with the gearing. Horsepower is on par with the 6.2 GM diesel the military used to get in Blazers and pickups. It won't win any races but should be livable.

OTOH, you could squeeze in a 4BT Cummins, or a GM 6.5, or even a Duramax or 6BT Cummins. These would be more fun. Dare to be different-find a used C7 Cat and use that.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

How much would the Suburban weigh? 87 300D weighs in roughly 3300 lbs (Sd or SDL probably in the 4000 range), 2.65 gears, 1:1 gearing in 4th, and the 603 certainly had no trouble getting that car moving PDQ.

603 is supposed to give max torque around 2400 rpm. I'd say you'd need to sit down and crunch some numbers as far as tranny gear ratios, rear diff ratios, tire sizes, etc, to get an idea of engine rpm versus speed and where you'd be in the power curve.

My used-to-be tranny guru up in NC told me IHHO the 722 was the toughest auto tranny ever built. I'd have more faith in it that some of these latter-day electronically controlled wonders that need unobtanium fluid to work properly.

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Just say "NO" to Ethanol - Drive Diesel

Mitchell Oates
Mooresville, NC
'87 300D 212K miles
'87 300D 151K miles - R.I.P. 12/08
'05 Jeep Liberty CRD 67K miles
Grumpy Old Diesel Owners Club

A NA 603 powered G wagon is a dog, probably weighs about as much as a suburban.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I was just thinking out loud. The Suburban already has a 6.5 td.

Sixto
87 300D

many years ago a buddy and his friends put a turbo diesel Isuzu 4 cylinder shrimp boat motor into a 70's era Suburban. Made the cover of some magazine. Ran and pulled as well as the 350 it replaced- at twice the MPG.

Mercedes Sprinter vans used a 602 diesel that cranks out 129 HP and they seem to get around OK.