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  1. 7

    Need a bit more oomph...

    I have a 1985 K20. It appears the previous owner put in a crate 350 - likely the lowest horsepower/torque engine - it doesn't have a ton of guts. A few months ago I swap out the SM 465 for an NV4500. It has an edelbrock cab (unknown which carb). I'm about to swap out the front clip (rusty...
  2. 7

    Speedometer cable extension???

    I have a 1975 GMC Jimmy - and recently swapped in an NV4500/NP208 - previously had the SM465/NP203 - consequently my speedometer cable is about 3" short. What are my options? Can I order somewhere a longer cable or can I add an extension - if so where can I source what I need? Thoughts?
  3. 7

    Reverse light plug - SM465 to NV4500???

    Is there a way to convert the old style plug (for the SM 465) to a newer NV4500 plug - on top of the tranny?
  4. 7

    Nv4500 ‘rattle’ between acceleration and deceleration…

    I swapped in an NV4500/np208 into my 1975 Jimmy - 3rd vehicle I’ve swapped in the NV4500. I had both rebuilt before the swap by Standard Transmission in Fort Worth TX. Here is the problem: in 3rd or 4th or 5th gear, when there is no ‘pressure’ on the tranny (so not accelerating or...
  5. 7

    NV4500 + 12” clutch and pressure plate???

    I just installed my NV4500 and used the AA kit (bell housing + hydraulic slave mounting bracket) 2 questions: 1. I could only get a 12” clutch setup … no 11” was available.. and my stock clutch was also 12”… Everything seems to bolt up… Am I in for a rude awakening when I crank it? 2. Anyone...
  6. 7

    How much slack to too much slack?

    Check out my video here: https://www.instagram.com/reel/ClcaSsXrOPx/?igshid=YmMyMTA2M2Y= How much slack to too much?
  7. 7

    Source for Power Window door panels?

    I can't seem to find a supplier for power window door panels for a 1975 Blazer. - Manual windows all day long... but no power window door panels. Would a 1977 door panel fit by chance? Other options? Any help is much appreicated!
  8. 7

    Fuel tank sending unit - 3 port or 4 port?

    I some of you know, I had vapor lock issues on my trip to the mountains last summer. I'm add a return line (so new fuel pump and sending unit) and have 2 questions: 1. Can I use rubber fuel line for the return - or must it be steel? 2. One option on a sending unit is from Oreilly's; but it is a...
  9. 7

    Vacuum line into the firewall?

    My guess is this will be an easy question for you all. On my 85’ K20, there is a very small diameter line the connects on one end into the larger vacuum line that runs into the vacuum reservoir, the other end runs into the firewall and under the dash somewhere. What is this line for? And for...
  10. 7

    Speedometer question

    What would cause the speedometer to only start working at say 30 or so.. and jump around and at 60 mph, it only shows 45 or 50? Is it most likely: 1. the greased up super dirty speedometer cable 2. something in the transfer case 3. the gauge? Thoughts?
  11. 7

    Oil pressure question… or two questions

    As mentioned previously. I bought an 85’ K20 for my daughter to be her daily driver. Engine looks like to be a GM crate motor. The guy I bought it from said he just changed the oil… used 10W 40. However the intake, sides of the motor, bottom…everything was so covered in grime, oil and Oklahoma...
  12. 7

    Question on tire size for an '85 K20...

    Purchased an '85 K20... my daughter wants it to be her daily... all original.. needs some work of course. Two questions: 1. Do these trucks benefit from a leaf-spring upgrade in the front to level the stance? The 'natural' stance of these trucks seems to be 'high' in the rear - I'm assuming...
  13. 7

    Engine cleanup???

    As I mentioned in an earlier post.. I picked up a 1985 K20 as a daily driver for my daughter. The intake and below the manifolds are really really gunked up with oil and dirt and more oil and dirt. Any thoughts of the best way to clean out all the intake crevasses and the 1/2” thick farm dirt...
  14. 7

    1975 Blazer - Sourcing the long tie rod?

    Anyone else having a hard time finding a replacement ‘long’ tie rod with the steering dampener connection point close to the actual tie rod end vs the connection point being in the middle?
  15. 7

    1985 K20 Temp sending unit location?

    I just picked up this beauty for my daughter yesterday (see pic). All original except for what looks like a GM crate motor. No working temp gauge (had to buy a hand-held temp gun to check running temp)… Looking at the motor, it looks like the sending unit is maybe on the top of the thermostat...
  16. 7

    Any upgrade 'hacks' to the stock heater blower fan?

    Its cold today in Texas.. 22 degrees at noon. My old 75' Blazer does not yet have any door soundproofing (insulation) or floor soundproofing/carpet... lots of windows and its a fairly large space to heat... Anyone know of any update 'hacks' to the stock blower fan - to push more air? Heated...
  17. 7

    Salvage yard doors - electric

    The basket-case Blazer I picked up last year came with two fairly straight replacement doors. The issue is the previous owner planned to convert the Blazer to electric windows so those are the doors he sourced. I need to know, to which wire in the door harness do I run 12 volts, which wire I...
  18. 7

    Time for a Radiator Upgrade...?

    Thoughts on specifically what radiator you all would suggest for my 1975 Blazer... 350 engine? Back story: In my 'Stranded' thread from late July early August, my Blazer was vapor-locking in the Colorado mountains, partially due (I think) to it running too hot. So now back in Texas - it was...
  19. 7

    Turn signal power?

    Back story: I put in a new steering wheel (OEM from a salvage yard) and with it a new turn signal canceling cam with wiring... Turn signals, horn worked great. One day, the turn signals just no longer worked .... it isn't the flasher.... Horn still works great - so the steering column has...
  20. 7

    Stranded… could use some ideas.

    Drove from Dallas to Raton NM (615 miles) with no issues. Turned towards Raton and the engine ‘stumbled’… then ran fine. Then it started stumbling with every hill… ran fine on flat ground… then outside of Pueblo CO it died. It only seems to stumble ‘under load’… Temp never over 205 or so...
  21. 7

    Vibration sitting at a traffic light

    So wanted to run this by you all.... Engine runs smooth at all RPM's under load (driving...)... Sitting at a traffic light though, it seem to have an idle vibration; - can see my steering wheel shake and feel it... up to about 1500 RPM... really any higher RPM and its smooths out.... Again...
  22. 7

    Anybody ever have a sticky throttle?

    As the subject says, anyone have a sticky throttle, that is not the throttle cable? When I disconnect the cable from the carb, the throttle cable moves the gas pedal smooth as silk… but when driving, the throttle feels a bit sticky…? Any thoughts much appreciated!
  23. 7

    Temp gauge posts? Which is which?

    I need to direct wire this temp gauge, but need to know which post is ground, which is 12 volts, which is temp sensor…? this issue standard’73 - ‘80 something temp gauge. any direction much appreciated!
  24. 7

    'Diesel rattle' in my 350...?

    Not sure how to describe the 'rattle' I'm hearing coming from, I believe, the front of the engine at idle - not a consistent rattle. The rattle does not 'come and go'... but also is not consistent - so not something like rubbing as the engine turns.... Again, a bit of backstory... bought the...
  25. 7

    Options for a ‘75 GMC Jimmy grill?

    As the subject note: I am in need of a 1975 GNC Jimmy grill, but appears nobody makes them any longer. I’ve found ‘73-‘74’s… an later models but no ‘75 grills. it seems the mounting holes are unique for the ‘75 and ‘76??? Anyone here with a solution by chance or options to mount a Chevy grill?

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