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  1. #21
    okay, so here's the scoop. I got the replacement mount from them today. and its the same as the 'wrong' one they sent me before. however, this one is labeled.
    the 'wrong' ones they sent (on the right in the picture above) are part # 25994881, whereas the one on the left in the pic is 25791031
    from what I can find, the 25994881 is the superceeded part number for 25791031 from GM. after reading some of this monster post:
    http://www.dieselplace.com/forum/sho...272124&page=47

    I see that people who are swapping these in are using both part numbers. I've seen a couple who mentioned that using 25791031 had a 'clink' noise every once in a while, which might be why GM changed to 25994881 which has a much smaller center hole as you can see in the pictures. either way, it looks like either upper mount will work, so since I already have 2 #25994881 I'll be using those along with the 25791032 lower cushions and 15854745 washers.

    that thread above is monsterous, but when I do mine, I'll take pics and do a write up on it as well.

    Jeff, do you still want me to get dimentions of these so you can check if they'll work on yours? let me know and I can get out the calipers
    '96 C1500 ECSB, 5.7L the "LS31", T56, 411 PCM, EFILive self-tuned, LC-1, Distributorless 24x CNP, LS2 coils,
    ZZ4 cam, Custom MPFI, RHS heads, Hydroboost, LT's/dual 3", Mark VIII Fan,
    Truetrac, 4.88, sound deadened, DEH-P600UB, Polk comps/10", kicker amps.

  2. #22
    Supporting Member Lextech's Avatar
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    Oak Forest, Illinois U.S.A.
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    Yes Please.
    I've heard they won't work on a Standard Cab. I want to see for myself, but I don't want to buy mounts until I'm sure.

    Jeff
    98 GMC RCSB 2wd "LS30" Homemade twin T3 junkyard turbos, 3 Saab intercoolers made into 1, 4l80e trans, Moser M60 rear end with 4:10 gears, Boxed frame, Ramjet intake, twin fuel pumps, Slide-A-Links, 24x Coil Near Plug conversion, Homemade 4/6 drop.

  3. #23
    yeah no problem
    '96 C1500 ECSB, 5.7L the "LS31", T56, 411 PCM, EFILive self-tuned, LC-1, Distributorless 24x CNP, LS2 coils,
    ZZ4 cam, Custom MPFI, RHS heads, Hydroboost, LT's/dual 3", Mark VIII Fan,
    Truetrac, 4.88, sound deadened, DEH-P600UB, Polk comps/10", kicker amps.

  4. #24
    Okay, if we're looking at this picture, the one I'm measuring is PN 25994881 which is the one on the right


    this is a crude side view drawing with measurements:


    and this is the top and bottom views, the one on the left is what you can see on the top in the picture above. ID = inner diameter (hole) measurement, OD = outer diameter measurement. the one on the right is what would be on the bottom in the picture above.


    sorry these drawings are really rudimentary, if they don't make sense, let me know and I can try to get something better.
    '96 C1500 ECSB, 5.7L the "LS31", T56, 411 PCM, EFILive self-tuned, LC-1, Distributorless 24x CNP, LS2 coils,
    ZZ4 cam, Custom MPFI, RHS heads, Hydroboost, LT's/dual 3", Mark VIII Fan,
    Truetrac, 4.88, sound deadened, DEH-P600UB, Polk comps/10", kicker amps.

  5. #25
    Supporting Member Lextech's Avatar
    Join Date
    Jan 2011
    Location
    Oak Forest, Illinois U.S.A.
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    223
    Thank You , Those renderings are perfect.
    98 GMC RCSB 2wd "LS30" Homemade twin T3 junkyard turbos, 3 Saab intercoolers made into 1, 4l80e trans, Moser M60 rear end with 4:10 gears, Boxed frame, Ramjet intake, twin fuel pumps, Slide-A-Links, 24x Coil Near Plug conversion, Homemade 4/6 drop.

  6. #26
    let me know if they'll work or not. now that I have everything, once it gets warmer I'll install 'em
    '96 C1500 ECSB, 5.7L the "LS31", T56, 411 PCM, EFILive self-tuned, LC-1, Distributorless 24x CNP, LS2 coils,
    ZZ4 cam, Custom MPFI, RHS heads, Hydroboost, LT's/dual 3", Mark VIII Fan,
    Truetrac, 4.88, sound deadened, DEH-P600UB, Polk comps/10", kicker amps.

  7. #27
    Supporting Member Lextech's Avatar
    Join Date
    Jan 2011
    Location
    Oak Forest, Illinois U.S.A.
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    I probably won't be able to check under my truck until Saturday. But, I will let you know.

    Jeff
    98 GMC RCSB 2wd "LS30" Homemade twin T3 junkyard turbos, 3 Saab intercoolers made into 1, 4l80e trans, Moser M60 rear end with 4:10 gears, Boxed frame, Ramjet intake, twin fuel pumps, Slide-A-Links, 24x Coil Near Plug conversion, Homemade 4/6 drop.

  8. #28
    the weather is getting warmer, I'll probably be doing this and a write up on it soon.
    '96 C1500 ECSB, 5.7L the "LS31", T56, 411 PCM, EFILive self-tuned, LC-1, Distributorless 24x CNP, LS2 coils,
    ZZ4 cam, Custom MPFI, RHS heads, Hydroboost, LT's/dual 3", Mark VIII Fan,
    Truetrac, 4.88, sound deadened, DEH-P600UB, Polk comps/10", kicker amps.

  9. #29
    Monday and tuesday are supposed to be warm and somewhat dry, once I get the garage straightened up I'll put these 2011 mounts on a do a write up. hopefully they'll do well.
    '96 C1500 ECSB, 5.7L the "LS31", T56, 411 PCM, EFILive self-tuned, LC-1, Distributorless 24x CNP, LS2 coils,
    ZZ4 cam, Custom MPFI, RHS heads, Hydroboost, LT's/dual 3", Mark VIII Fan,
    Truetrac, 4.88, sound deadened, DEH-P600UB, Polk comps/10", kicker amps.

  10. #30
    Super Moderator HellKnightHicks's Avatar
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    Jan 2011
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    Irvine, Ky
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    yea youll have to let us know if its worth the effort... cause my truck rides a little on the rough side.... wouldnt hurt to softin it up...... lol it dont bother me though.
    2012 Camaro SS2 (544HP/500TQ) MagnaCharger Cam Headers...
    1996 C1500 3 door, bed cover, front drop 20"s.
    1997 K1500 X Cab, {War Machine}, a lot of custom work.

    www.prosilversystems.com

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