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  1. #1

    Default 84 c10 silverado 700r4 to th350 swap driveshaft help

    Ok guys i need some help here badly.I have a 84 c10 chevy silverado truck it had a 700r4 transmission that stopped shifting i checked the obvious quick fixes to no avail.So i had a thm 350 that i rebuilt some time back i figured i would just put it in place of the 700r4.Now here is my problem the tailshaft on the th350 is a 6 inch tail and the 700 r4 has a 9 inch tailshaft .So my drive shaft is 3 inches to short.I took it to a machine shop in town and they said they couldn`t add 3 inches to it without replacing the whole main tubing .They said i needed a longer drive shaft and they could then cut a 3 inch section out no problem and shorten it.I measured the drive shaft i have it is 5` 11 and half inches.So if i added 3 inches that would mean i need a drive shaft that is 6` 2 and half inches.
    I have no ideal where to get either a drive shaft that would work but is longer to have it cut down or a drive shaft that is the size i need.So i am hoping you guys can help me and point me in the right direction on this becuase i`m lost .

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    Ok i think i know why i am having so much trouble with this.The drive shaft i have now is a one piece drive shaft .I beleave that someone has removed the 2 piece drive shaft and replaced it with this one piece .the drive shaft i have now is 71 1/2 inches and i need one 74 1/2 inches.

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    Ok so i called to have a one piece drive shaft made but they want 489$ for one and i just don`t have that kind of funds .So i`m thinking of going to a junk yard and finding the 2 piece drive shaft and replacing it.
    I see 2 places under the truck that could have been for the carrier bearing this is one place here.Click image for larger version. 

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    You can see in the first pic the frame is rounded somewhat.like maybe for a carrier bearing?This is about a foot and half or 2 foot from the rearend.

    These next pics are about halfway between the transmission and the rearend and looks like a bracket has been cut from the frame.So does anyone know whitch of these 2 spots is where the carrier bearing mounts?
    Click image for larger version. 

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  2. #2

    Default

    Hi,
    do You have already installed the new 2pieces driveshaft?
    In a old Truck iīve got a 2pieces driveshaft, too.
    I marked the install-position, i hope you, too?!?
    If you donīt mark the position of your driveshaft at your diff and transfer-case it will be a long tortoure, till the driveshaft turns 100% right without "vibrations".
    Greetings from Bavaria

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