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  1. Mechanic421

    Used parts

    I am in Statesville North Carolina. I have a couple things for sale, but sorry I can not ship. So if you are in the state and interested in what I have then message me. Most everything is from a 05 Denali XL. Fuel pump is 01 8.1 Silverado Delphi. Also a 4l65e awd/4wd. All gearing is 3.73.
  2. Mechanic421

    Anti-theft

    does a 06 Denali have pulse width modulation for the fuel pump? Or is it regulated in the tank? I am trying to interrupt the fuel pump circuit for an anti-theft device.
  3. Mechanic421

    Circle D

    So I have to give a shut out to Circle D. I am running a lot of bolt ons except my transmission and 300mm 2200-2400 Circle D converter (4l65e) almost 12,000 lbs with trailer.Now I know a lot of you guys don’t like the 4l60 style transmission! But I now have about 50,000 of a lot of towing,drag...
  4. Mechanic421

    Lq4 rering

    So slow right know so I thought time to rering my spare lq4. My engine in my truck now runs great just has 205000 and starting to leak pretty good. This engine has 175000 it ran well also when pulled but also leaked. So I disassembled it today and was very pleased! Mains look like new rods have...
  5. Mechanic421

    I want a Silverado SS

    I am about to mod a customers SS and am a little jealous!
  6. Mechanic421

    New to Statesville North Carolina

    So October I moved from Port St Lucie Florida to Statesville North Carolina. Well the Denali kicked ass no issues with my 7by16 enclosed trailer over loaded twice 750 miles! I get about 10.5 mpg loaded or empty trailer. Wind Resistance is a *****. So my truck has BBK one and three-quarter inch...
  7. Mechanic421

    Is this a good or bad time slip?

    06 Denali XL stock engine,cat back, mit,8.5 mm blue streak wires,Black Bear tune,2200-2400 circle d converter, too much to list inside transmission . My first transmission build, wish I would have done a wide band and plan on a 4l70e 2nd gear Servo soon not as firm as corvette servo. Every...
  8. Mechanic421

    06 Denali rear axle

    06 Denali rear axle 3.73 two speed sensors ,control arms,airlift airbags make me a offer. I am in south east Florida.
  9. Mechanic421

    06 Denali rear axle

    For sale 06 Denali rear axle assembly complete less brakes. No noise at all! It comes with air lift bags in springs,hoses,air valves and control arms with good bushings. I am in Saint Lucie country Florida that’s south-east Florida. I am looking to get $500.00 for it. It has two speed sensors...
  10. Mechanic421

    Sonnax heavy duty and circle d 4l65e

    About to install my 4l65e with sonnax heavy duty upgrades and circle d 2200-2400 stall converter in my 06 Denali xl
  11. Mechanic421

    need a tune

    I have an 06 denali xl and looking for a good tuner for a custom tune. Please don’t reply with black bear they are to hard to get on the phone and like to communicate primary by emails! Has any one used Nelson’s with any luck?
  12. Mechanic421

    H D sonnax truck 4L65E

    Has anybody here built or had built the heavy duty truck 4l65e transmission on sonnax website. If so your thoughts. I have ordered all my parts for the build . It will be my first transmission but I will have help from a experienced builder!
  13. Mechanic421

    New bee from river park fl.

    Hi i am mechanic421 l am a mechanic for most of my life. For many years i have used forums to help me diagnose a many car or truck,time is money. So with that said i have a 05 denali xl so far all is well no issues i couldn't handle. But you're forum has helped my with mods. And some my own. So...

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