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  1. highperf4x4

    High perf Vortec 350

    Vortec truck motor from a low mileage 2000 model 3/4 ton truck. Completely rebuilt with upgraded internals and 10:1 compression. Block Align honed for crank Cylinder bores honed Decked New cam bearings and brass freeze plugs Crankshaft polished std/std Felpro high performance front and rear...
  2. highperf4x4

    '79 Ford Dana 44 3/4 ton front axle. 4.56, locked

    Dana 44 front axle from a 1979 Ford 3/4 ton snow plow truck for solid axle swap. Completely disassembled and built from scratch by Gary Johnsons differential in OKC. Housing blasted and painted. All new bearings seals, master install kit. Upgraded U-joints. Dual piston brake calipers...
  3. highperf4x4

    Salvage yard leaf springs for my SAS

    I found some 52" rear leaf springs on a square body Chevy truck at a local salvage yard. The truck was 73-81. It didn't have a bed on it or wheels so it was hard to tell if it was lifted much. It did have 1" blocks under these springs that were crumbling. The springs aren't old enough to be...
  4. highperf4x4

    Up. Grade.

    670 Street Avenger to 780 Pro Systems HP racing carb for the 383 stroker.
  5. highperf4x4

    Paden Mud Bog 4/11/2015

    Ended up 3rd in the SUPER MODIFIED class. Mostly by attrition though. I was supposed to be in the Stock Modified class. LOL https://youtu.be/VRzTocR57vI
  6. highperf4x4

    Rednecks with Paychecks!

    Who else is going to be there?
  7. highperf4x4

    Have I posted a pic lately?

  8. highperf4x4

    Actuator questions

    I'm having an issue with my front actuator. It seems that when I submerge it in the river it knocks out the actuator? It doesn't blow the fuse but it won't work again until I change the actuator. I've put several in it this year. I'm not sure why this is happening now? The original actuator...
  9. highperf4x4

    15" wheels for '90 K1500?

    Can anyone tell me if there is a caliper clearance issue putting a 15" wheel on a 1990 4x4? I've found an excellent deal on some 15" boggers I'd like to buy. I'll have to use 15x10 wheels though minimum. Maybe 15x12.
  10. highperf4x4

    Front differential won't engage

    My truck is a 1990 GMC k1500 with the floor shift 208c transfer case. Everything worked fine before I started my most recent upgrades. I pulled the front differential to install a 6" lift kit. While I had it out I took it to the shop and had new gears, bearings, seals installed. I also pulled...
  11. highperf4x4

    RCX lift kit for The Duke

    I guess I should be doing a thread on this install huh? Can I just start in the middle with a pic of the brake lines? Blame it on my ADD. I just took them in and had 6" longer hoses installed on my lines. Sent from my SCH-I545 using Tapatalk
  12. highperf4x4

    I need some quick helP!!

    I can't find the right crossmember/mount for my adapter plate!! While searching online I found this. It says it's a th400 to NP208 adapter which is what I should need for the NP241 right? Mine looks like this. It bolts up to the transfer case perfectly but...
  13. highperf4x4

    93-97 NV3500 short throw shifter

    I have a barely used at all short throw shifter for the 93-97 NV3500 (I'm not even sure it's ever been installed). Includes the base in like new condition with the adjustable bump stops and the long Hurst shift arm with a few nicks on it from laying around in my storage building. Does not...
  14. highperf4x4

    4low strong enough for racing?

    I need some advice. I'm trying to figure out if I can race my truck in 4low without damaging the transfer case. I'm not sure how the case accomplishes the gear reduction but I could really use it right now. The current engine is only about 425hp. Will 4low take the abuse of mud bogging? The...
  15. highperf4x4

    5lm60 to THt400 swap questions

    I have a 1990 GMC K1500,5lm60 5speed and an NP241 transfer case. I'm going to do a swap to a TH400. From what I've searched out on here so far, the 32 spline count for my t-case should be correct for the TH400? I need one with a 2 3/8" output shaft? Now for my stupid questions. Since...
  16. highperf4x4

    Short throw shifter dilema

    I have a short throw shifter I was planning to install in my truck but after pulling my old one out it appears that the ball is not in the same location on the new shifter. The ball on my old shifter is recessed inside the housing and the ball on the new one sticks out. I've seen some photos on...
  17. highperf4x4

    Transmission, T/case advice

    New face here but I figured I would dive in the question pool. This looks like a good place to start. Truck is a 90 GMC K1500, NV3500 and NP241 case. My transmission has about 400,000 miles on it and I need to change it soon. The last 200,000 miles have been hard ones behind 3 different...
  18. highperf4x4

    Hello from Oklahoma

    Looks like some pretty sharp trucks around here. Trying to get involved with more people in the 88-98 arena. I have a non-stock 1990 GMC K1500 that I've owned since 2002. It will be nice to get some info and technical advice from people with experience. I can't seem to upload pics from my...

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