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    GM 8.5 10 bolt swap from a 96 impala ss

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    HeavyChevy77
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    Re: GM 8.5 10 bolt swap from a 96 impala ss

    Post  HeavyChevy77 on Fri Jan 16, 2015 7:52 pm

    https://i.servimg.com/u/f38/18/98/28/33/image10.jpg

    Old master 

    https://i.servimg.com/u/f38/18/98/28/33/image13.jpg

    New master
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    Re: GM 8.5 10 bolt swap from a 96 impala ss

    Post  HeavyChevy77 on Sat Jan 17, 2015 10:23 pm

    After looking at the new master I see the rear part of the reservoir is larger , that makes it the primary, and the thread pitch is smaller 9/16 18 but the old primary line is 1/2 20.
    O'Reilly has "standard to dual master cylinder" sae type adapter fitting (1/2 20-> 9/16 18 and vise Vera) but I will still need to cross the tubing so the run to the appropriate port on the combination valve
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    Re: GM 8.5 10 bolt swap from a 96 impala ss

    Post  GM B-Body Forum on Sun Jan 18, 2015 9:49 am

    I didnt know they switched the ports around, your best bet maybe to get some of those adapters, and perhaps a few pre flared lines from oreilly also, i would runs those lines just to the combi valve if you need to change the size of the lines, but if you can get away with just using adapters then that would be even better. When i do my brake swap im just going to use an ss and 9c1 master cylinder and convert all my lines to metric, im also going to get a combi valve from wilwood, and mount it just below the master cyl and off the frame.


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    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
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    Re: GM 8.5 10 bolt swap from a 96 impala ss

    Post  HeavyChevy77 on Sun Jan 18, 2015 2:43 pm

    Well the difference between the master of the 90 Caprice and ss is 1 1/8 bore vs 1 1/4 bore but the look like the same reservoir
    I did check and they do have fitting adapters so I'm gonna do that
    Also got a chrome combination valve with the original thread pitch for the lines we have already , its for disk/disk application and only $50!
    Bought one for disk/drum when my combi valve started leaking and worked badass
    I can lock up the brakes and stop quicker also helps with the burnouts now I can make clouds taller than trees with the tires
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    Re: GM 8.5 10 bolt swap from a 96 impala ss

    Post  HeavyChevy77 on Tue Jan 20, 2015 1:32 am

    Had a question about driveshaft length

    I grabbed a rear end from a 95' impala among with the driveshaft

    the impala has a lt1/4l60e

    My 77 caprice has a 350sbc/th350(I think, could be a hydrmatic 250)

    Anyone who's done this 8.5" 10 bolt swap can list the driveshaft length they ended up with also with their engine/transmission combo

    Thanks guys.. I'm really hoping I don't have to cut the 95' driveshaft since its balanced to 140 mph stock
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    Re: GM 8.5 10 bolt swap from a 96 impala ss

    Post  HeavyChevy77 on Tue Jan 20, 2015 1:58 am

    I measured the driveshaft from the u joint ear to u joint ear it was 56"
    The trans yoke(?) On the trans side of the drive shaft measured ear to the shaft tip 6 1/4" and yoke shaft (tube with the splines that connect to transmission) 3 3/4"
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    Re: GM 8.5 10 bolt swap from a 96 impala ss

    Post  HeavyChevy77 on Tue Jan 20, 2015 1:27 pm

    Th-350 dimensions
    6"tail shaft 27 11/16" length
    9" tail shaft 30 11/16" length

    4l60e dimensions
    30 3/4" length

    Can u guys list what length driveshaft u ended up with

      Current date/time is Tue Sep 19, 2017 6:34 pm