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  1. Bextreme04

    wiring msd ignition

    I would get a cheap waterproof relay box from Amazon or similar and use a different ignition signal(like the original wire to the HEI) to trigger the relay on. That way you get a clean, full battery power, signal to the MSD that isn't affected by all the power loss and voltage spikes it can get...
  2. Bextreme04

    Oil dripping around starter

    It depends on the oil pan installed. Standard is a 5 quart pan plus whatever is in the oil filter. Usually ~5.5-6 quarts total. You can check the dipstick level by looking at where the marks are on the dipstick when it is installed in the tube and the oil pan is removed. You can absolutely...
  3. Bextreme04

    Rearend gear ratios 1980-1987 most common

    My 74 C20 had 4.56 behind a 350/TH350. My 80 K25 has 4.10 behind a 350/TH400
  4. Bextreme04

    Whole A/C system Oil Capacity from R12 to R134A

    I would also recommend updating the stock orifice tube to a blue one when changing out to R134. It gives it almost stock R12 performance. I have an A6 compressor and blue orifice tube with the O.E. condenser and evaporator and it works awesome. ~50-55 degree upper vent temps with 100 degree...
  5. Bextreme04

    Whole A/C system Oil Capacity from R12 to R134A

    It depends entirely on what compressor you have. If you have the big A6 compressor it take significantly more oil because the compressor has a large reservoir at the bottom that you fill separately. Generally speaking, you should add some to every new component and then make up the difference to...
  6. Bextreme04

    Sad Discovery: GM 10 Bolt Fails

    My 2011 Suburban has a G80 10 bolt in it with 230k miles of towing and daily driving on it with no problems. If it was me, I'd buy a yukon duragrip, new ring&pinion in whatever gear ratio you want, and a rebuild kit. You be in it for ~$700 and it will last the rest of the time you own it.
  7. Bextreme04

    C10 LIMITED SLIP VS LOCKER VS SPOOL

    If you are doing limited daily driving and are mostly just straight line burnouts and donuts then a locker or spool is the way to go. If you daily drive it or want turning traction, then a posi/limited slip is the way to go. I've got a Yukon Grizzly locker in my 14BFF in the K25 because it was...
  8. Bextreme04

    Newbie Vortec Cam Question

    You will want a dual plane intake. The single plane is only going to be good for a throttle body style fuel injection. For a truck engine you will want something like this...
  9. Bextreme04

    81 k30 no fuel.

    yep, check for air leaks and cracked rubber lines. You can also check all this by pulling the hose at the mechanical pump, with a 3/8" barb to 3/8" barb to another small section of hose that has a small hole punched in it and stick your air compressor wand in the end. If fuel comes out, then...
  10. Bextreme04

    Anyone ever make/crimp their own high pressure hoses?

    I was just going to order a kit like this...
  11. Bextreme04

    Craziest antitheft idea yet.

    There's a big difference between trying to drag a Chevy cruise with the parking brake on and a 5400lb truck on 12.5" wide all terrain tires. That being said, it wouldn't stop someone with a rollback from pulling up and dragging it up and on, but it would make it much more of a PITA. Of course...
  12. Bextreme04

    thoughts on low vacuum?

    Is this an automatic or manual trans? It must be a pretty aggressive cam to have vacuum that low, which means it isn't going to like having a low stall converter or to be in lower RPM ranges. If you have an automatic and still using the stock converter, I would expect it to pull against the...
  13. Bextreme04

    LS swap transfer case options?

    either get a 4l80 and then use any 32 spline passenger drop TC, or you will need to use whatever TC comes with your 6L80. If you get a 6l80/90, you will need to get a billet front covered torque converter. 83 was a year or two too early for you to be able to just reuse your stock NP208 I...
  14. Bextreme04

    Have i decoded this VIN correctly????

    The only difference between 2wd and 4wd frame is the engine cradle and front spring mounts, so make sure you take really good pics of that whole area. You'll be able to tell real quick if it is an original 2wd frame converted to 4wd or if it is an original 4wd frame just from how the spring...
  15. Bextreme04

    Have i decoded this VIN correctly????

    On my 1980 K25, the frame stamping is visible by looking straight down between the cab and bed on the passenger side.
  16. Bextreme04

    Rear Shackle Bushing - Replaceable?

    ORD will sell you a complete greasable rear spring bushing set for ~$100. https://www.offroaddesign.com/greasable-rear-spring-and-shackle-bushing-kits-for-gm-trucks.html
  17. Bextreme04

    For you LS swap guys.

    DOD and AFM are the same thing. DOD is what GM called it before the 2000's. It is now AFM(trademarked by GM), but everyone just calls it AFM/DOD. Late Gen III started to get DOD/AFM and then Gen IV got AFM and VVT in various mixes...
  18. Bextreme04

    Further VIN questions. all chassis VINs just partials?

    Are you reconstructing it from parts? Is the actual titled VIN not a 4wd? Usually the partial is only there to show that it matches the full VIN on the dashboard or the inside of the door jam.
  19. Bextreme04

    1982 GMC - What do I have? What can I tow?

    https://www.gmsquarebody.com/threads/revisiting-k10-vs-k20-vs-k30-frame-specs.11279/
  20. Bextreme04

    1982 GMC - What do I have? What can I tow?

    I knew that there was a 1" difference between the frames, but It appears I had my numbers wrong. 1/2 ton and 3/4 ton have the same frame height. If yours is an HD(C6P) option, the frame thickness(how thick the actual metal is) will be more than the standard 3/4 ton and all 1/2 ton frames. The...
  21. Bextreme04

    1976 GMC C35 SM465 to GM ZF6

    I'm confused... what is made of plastic? The ZF6 was standard on most of the towing application with high torque like 8.1 and Duramax trucks, they are super beefy. If they bolt right up to an 8.1, they will bolt right up to any SBC or BBC
  22. Bextreme04

    Are locking hubs factory or personal add on?

    There are permanently locked, manually locking, and then auto locking hubs. A standard 4x4 would have manually locking hubs as standard with an NP205, NP208, or NP241 depending on year and GVWR. Auto locking was an optional RPO for those transfer cases. Permanently locked hubs only came on 4x4...
  23. Bextreme04

    No spark

    That wire was supposed to only be temporary to make sure you didn't have an ignition power problem. As soon as it didn't fix your problem you should have removed it and gone back to the regular system. Now that you have it able to run with you out of the drivers seat, you need to do the proper...
  24. Bextreme04

    1982 GMC - What do I have? What can I tow?

    The VIN being for a K25 means you are only tow rated for 6k lbs or maybe even less. That being said... my 1980 K25 has the exact same drivetrain and brakes that could have come on a 1999 and earlier 1-ton truck that is rated for 10k lbs of towing or more. The only squarebody trucks I've seen...
  25. Bextreme04

    1982 GMC - What do I have? What can I tow?

    The cab is from a 8600GVW K25. Single cab, single rear wheel. Looks like someone swapped the cab onto a C30 cab and chassis frame/running gear. You can see if it is a one ton by measuring the height of the frame C-channel. I think the 3/4 ton is 5-ish inches and the 1-ton is 6-ish inches tall...

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