First off: Thank you one and all, very sincerely, for such great advice and your experiences in towing a tractor with a half-ton pickup. I am the boyfriend about whom cgadbois is genuinely concerned - bless her heart. I thought that I should post a few more details, so that all of us have the right facts. About the only thing which I have not come up with is the GVWR of the 1991 Chev C-1500 pickup. Have not found exact figures on-line for this year - but judging from other build years, somewhere around 6200 lbs.
Here is the detail on the towing rig and the trailer. I called the manufacturer, Alum-Line to get the unloaded trailer weight, and know pretty much already the weight of the 1955 Massey Harris 44 Special row crop which I am picking up.
- Trailer: unloaded weight 1760 lbs. (It's aluminum)
- Trailer axles: 5200 lb. rating per axle, total rating 10,400 lbs.
- Trailer brakes: electric, all four wheels
- Trailer tires: New, trailer rated (sidewall reinforced) each tire load capacity is 2450 lbs.
- Trailer coupler: Hammerblow, 2 5/16 " ball, breakaway kit
- Tow vehicle: 91 Chev C-1500 pickup, 350 f.i. engine, 700-R4 automatic, rear-end ratio unknown, 74K miles, well-maintained.
- Tow vehicle approximate GVWR: 6200 lbs.
- Tow modifications added: TCI aluminum finned, extra 2 quart trans pan with temp gauge sender; Aluminum plate style cooler added in front of radiator, TCI trans. temp gauge installed in cab; Transmission flushed, (including torque converter) with new Kendall Dexron Type III fluid, Hayes Lemeurz "Genesis" Electronic trailer brake controller w/ abilitiy to adjust both minimum and maximum braking current. Hellwig LP-35 overload "helper" spring addition, (3500 lb. extra capacity), evidently overkill for a 1/2 ton.
- Towing Receiver: Class III Draw Tite, weight dist. capacity = 8000 lbs. trailer weight, tongue weight w/ WD hitch = 800 lbs. ; w/ NO WD hitch = 5000 lbs. trailer weigth with 500 lb. tongue weight max.
- Towing Hitch: Reese Stait Line 'combo-style' trunnion WD hitch with dual-arm Sway Control unit, model # 66021, (800 lb. tongue weight max.), 2 5/16" towing ball.
- Trailer Load: weight of Massey-Harris 44 Special tractor = 4685 lbs.
- Total trailer weight (as best I can estimate): 6445 lbs.
- Tractor to be chained to the six, integrated trailer deck loops, with chain binders installed.
- My experience towing: Mostly pulling an older 4 horse Linville stock trailer with a 1972 3/4 ton Chevy pickup. No WD hitch installed, but also not going from Holland, Michigan to Portland, Oregon. Older Kelsey-Hayes style hydraulic to electric current trailer brake controller.
- I hope this gives a better overall picture, and again, thank you all very much for the great input - especially about not using the 700-R4 in OD mode when towing.
Regards, Grayrider from western Oregon.