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700r4 blown. Nv3500/4500 swap

Discussion in 'Manual Transmission & Clutch' started by guitarfreak235, Oct 7, 2018.

  1. roundhouse

    roundhouse Full Access Member

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    atlanta ga
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    justin
    Truck Year:
    77,78,79,80 ?
    Truck Model:
    K10
    Engine Size:
    350
    The 3500 in the S-10 won’t fit

    Think it has a differentbellhoising bolt pattern

    Also the pattern for the transfer case is different



    The 3500 is a 32 spline
    Needs a NP208 from behind a late 80s TH400 with the round bolt pattern

    The 208s came in figure eight bolt patterns with two or three different splines , and in circle bolt patterns with 27 or 32 splines

    When you’re shopping for one , do NOT trust the seller
    They will lie to sell it
    Count them yourself
    Or ask them to send you a good quality pic of the splines

    And get the crossmember support if you can

    And ask for a pic of the t case
    I’ve driven an hour to buy a 32 spline 208 and found the diphead seller had a NP205

    I would try to drive a 465 in someone’s truck before you swap one in

    They shift really slow and the ratios are way far apart

    I like the 3500
    It’s the closest you can get to a car transmission in a pickup

    I’ve had a stock 3 speed and T-18 in my bronco before the 3550 in my bronco

    And a 465 in the K10 before the 3500

    And there is a huge difference in drive-ability on the street for a daily driver
     
    Last edited: Oct 10, 2018
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  2. bucket

    bucket Super Moderator Staff Member

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    The 208 used in GM trucks only came as a round pattern. It was introduced in '81. It's often overlooked that the round pattern 27/32 stuff came out that early because everyone's focus is always the K30 which didn't get anything round pattern until '85. Through '84, they retained the figure eight 205 with 10/32 splines.
     
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  3. guitarfreak235

    guitarfreak235 Full Access Member

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    Lots of good info. I found a rebuilt 700r4 with a new torque converter for $300 and just snagged it. 20k on the rebuild so sounded like a good deal cuz tranny shops are all asking for 900 plus per rebuild.

    Im putting that in for now, and might just assemble the required parts for the manual swap when im not in a hurry

    Sent from my SM-G920V using Tapatalk
     
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  4. HotRodPC

    HotRodPC Administrator Staff Member

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    6.2 to Gas???
    SCORE !!! So long as it's really a good one, I'd certainly use it for now. Now that you have some ideas and know what to keep your eyes open for, then maybe beforre that one goes tits up you'll have acquired your parts for the conversion.
     
  5. mcarlo86

    mcarlo86 Junior Member

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    We are considering a NV4500 swap into our 90 V1500. I have a line on a good 4500 out of a 94 4X4 Chevy pickup. I also have a parts pickup '77 K20 with a 465 transmission in it. I'm wondering if the clutch pedals would work out of that pickup for the swap? I have seen that AA sells a NV4500 bellhousing for mechanical clutches so I wouldn't need the slave cylinder, master cylinder, etc. Has anyone had experience with one of those? I'm not positive on what t-case I have, but I think it is a 241? Would this t-case work with a NV4500? How about making it work with the factory cruise control?
     

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