01-23-2014, 09:43 PM | #1 |
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Location: Blyth, Ontario, Canada
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cross-member question
hey guys , i have 2 frames , one had a hanger bearing and the other did not. just wondering about the frame that did not have the hanger bearing. did it ever have a cross-member between the 2 rear cab mounts like the hanger bearing counterpart does ? or was this cross-member un-needed due to the fact that its a single drive-shaft? thanks guys !
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1986 LWB c10 w/327 & vortec heads |
01-24-2014, 12:15 AM | #2 |
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Re: cross-member question
Cummon guys somebodys gotta know...
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1986 LWB c10 w/327 & vortec heads |
01-24-2014, 12:24 AM | #3 |
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Re: cross-member question
Just guessing, but I think the two piece drive shaft was only for the C20s and C30s, so there would be no need for the carrier bearing mount on the C10 frames. The 1/2 ton and 3/4 ton frames are different, as I am sure you already know. Do you have one 1/2 ton and one 3/4 ton frame?
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01-24-2014, 12:27 AM | #4 |
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Re: cross-member question
Both frames are half tons , one had a 700r4 amd 2 pc driveshaft the other had a th350 and a single driveshaft . Just want to know if the single driveshaft 1500 ever had a crossmember or if it just had the cab mount brackets.
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1986 LWB c10 w/327 & vortec heads |
01-24-2014, 09:55 AM | #5 |
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Re: cross-member question
The 1/2 ton single drivelines just had the cab brackets. There should be a small crossmember between the 2 for the fuel lines to run along.
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01-24-2014, 11:47 AM | #6 |
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Re: cross-member question
Thats all i needed ! Thanks !
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1986 LWB c10 w/327 & vortec heads |
01-24-2014, 11:50 AM | #7 | |
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Re: cross-member question
Quote:
My 87 R10 has a 2 piece drive-shaft with a center bearing... |
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01-25-2014, 01:28 AM | #8 |
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Location: Oklahoma City, Oklahoma
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Re: cross-member question
The reason for the difference in driveshaft style is due to rear gear ratio, the lower gears (numerically higher) got two piece shafts with a center carrier bearing, the higher gears (numerically lower) got one piece shafts with no carrier bearing. I forget where the split happens, I think it's at 3:42 anything lower got the 2 piece shaft it might be 3:08 though, anyway Keith would know that.
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Rally 'round the family....with a pocket full of shells. |
01-26-2014, 10:01 AM | #9 |
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Re: cross-member question
Actually it has to do with harmonic frequencies and driveshaft whip. Keith did a little blurb on it a while back. In general either system will work for a DD, at the worst your joints will need replacing a little more often.
My 250 3OTT are all 2 piece, both 1/2 and 3/4 with 2.73 and 3.43 repsectively. My 250 TH350 3.08 is 1 piece, and my 6.2 700R4 3.08 is 2 piece.
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1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors |
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