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11-11-2002, 09:54 PM
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#1 |
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Young Gun wth Fast Inline
Join Date: Jan 2002
Location: Idaho
Posts: 1,475
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SM420 and NP205
Did they make this combo? The sm420 is one of the strongest trannies that i have known and many people agree, what about you? I have a 2wd version that I want to convert to a 4wd married to the t/c. Is this hard? I know finding one is nearly impossible. Has anyone did this swap and do you think that it would put up with 650-750 ft-lbs torque? What would be the strongest drivetrain to put up with that kinda power. Thanks
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1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!! |
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11-11-2002, 10:08 PM
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#2 |
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Registered User
Join Date: Aug 2002
Location: mass
Posts: 1,277
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what do you have that will put out 650-750 ft/lbs of torque?
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11-11-2002, 10:56 PM
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Young Gun wth Fast Inline
Join Date: Jan 2002
Location: Idaho
Posts: 1,475
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A tuned up cummins 6bt. Im thinking about using a GM tranny/tc. It would be smaller and cheaper to use by several 1K. Thanks
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1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!! |
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11-12-2002, 12:11 AM
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#4 |
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Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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Seen the sm240 / np205 married combo in a couple 69's. That would be the year of truck I would check for that combo....
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Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife. |
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11-12-2002, 12:12 AM
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#5 |
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Young Gun wth Fast Inline
Join Date: Jan 2002
Location: Idaho
Posts: 1,475
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The Sm420 was only produced from 1948-1967 i believe. They were put in the bigger 2.5 ton trucks all the way to 1/2 tons. Was it a stock combo you think or modified? I need all the info I can get.
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1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!! |
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11-12-2002, 08:43 AM
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#6 |
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Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,507
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If there ever was a 420/205 married combo, it was very rare. I have never seen or heard of it. SM465/NP205 on the other hand, is just as strong and there are tons of them out there. That is what I would use.
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Tim |
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11-12-2002, 11:30 PM
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#7 |
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Young Gun wth Fast Inline
Join Date: Jan 2002
Location: Idaho
Posts: 1,475
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Anybody else have any advice for me? The reason I want to go with the sm420 is that it is just as strong, but it is 2 inches shorter and 50 pounds lighter. You may not think its much, but if I can it would help my driveline angles and the engine is going to weigh 400 pounds more than the stock one, so I would like to sheer some pounds were I can. In the pre67 how is the 4 wheel drive setup?? Anyone know?? Thanks
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1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!! |
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