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  1. ⚙️ Transmission - Transfer Case - Driveline
    Hi Everyone, I've been looking to install a transmission cooler on my truck. I've eyed my sights on the Hayden 699 Cooler. Based on what I've seen online, it seems that it has an internal bypass that cools the transmission fluid when it hits operating temperature. It seems optimal for me...
  2. 4-Speed Automatic Transmission
    I’m working on a 2007 Silverado 1500 (NBS) 4.3l 4l60e. Replaced the transmission but now the truck won’t start. PRNDL is saying that the truck is in 1st gear and when I hook my scanner up the tcm is saying that the transmission is in 3rd gear. I have checked all grounds and searched the harness...
  3. 4-Speed Automatic Transmission
    Hey gentleman! So I purchased a used 4l60e tranny for my 97 gmc c1500 along with a brand new torque converter. Installed everything only to find that there is no 2nd gear! UGGHH!! All other gears work beautifully! Any ideas fellas? Thank y’all! 😘
  4. ⚙️ Transmission - Transfer Case - Driveline
    So, I opened up my tcase, cleaned out the pickup and magnet, added a case saver, and did a general look-over. While the rear half was off I replaced the output seal. But I got myself confused, and I installed the output seal upside down...the drain hole is now pointing UP, not DOWN. Grr. How...
  5. 4-Speed Automatic Transmission
    I just pulled my transfer case (246) and the transmission; they're sitting on the ground, and the tranny is waiting for me to load it up and take it to a guy who is going to rebuild it. Question: What else should I look at under the truck while I have those out? (Besides a general looking over...
  6. 4-Speed Automatic Transmission
    I have a 2004 gmc Sierra slt 4x4 5.3. When I drive it, I have to rev it out til about 40km/hr or 4000 rpm and have to let off the gas. Then it’ll find second. But when it does I got to be gentle on the gas or she slips back to first. Any suggestions? Has reverse.
  7. 6-Speed Automatic Transmission
    I've found a 6l80e in Texas that I'm interested in swapping in my truck, I'm curious on what all i need to get it driving, here's a Couple of things I'm about to purchase please let me know what I'm missing! Thanks 2013 6l80e 07 – ’08 LM5/LMG (5.3L) STANDALONE WIRING HARNESS W/6L80E from Zero...
  8. 4-Speed Automatic Transmission
    Will a 4l60e hooked to a 5.3L interchange to my truck that has a 4/60e hooked to a 4.8L.
  9. Gasser Tuning
    not sure if anyone else with a Bully dog GT on a 5.3 sierra has ever ran into this issue, but it’s seemingly been working fine for months and now when i select Install Download it’s claims it’s in recovery mode, then after continuing, it then asks for my trans (4-speed) but does nothing won’t...
  10. 4-Speed Automatic Transmission
    94 gmc Sierra k1500 4l60e 1-2 shifts hard when barely on the gas but when you have it wide open throttle it shifts smooth but it also slams into gear even from park to drive or reverse if anyone knows what could cause this please let me know I installed a 1-2 accumulator and also I’ve put a...
  11. 4-Speed Automatic Transmission
    The 4l60e tranmission I have had a stock deep pan with a plug. The plug was stripped well before I started this journey. So I ordered the pan below... However, when I go to install the pan, it does not sit flush at all. Lo and behold, I find the issue.... This indent is hitting the...
  12. 4-Speed Automatic Transmission
    Hey guys, I'm a mechanic over at a resort in sandestin and we have tons of chevy work trucks bit this 09 Silverado has me stumped. it has the 4l60e and its stuck in 3rd gear which I know is the only forward gear so I started off and replaced both solenoids that didn't work so moved on to the...
  13. Vortec 4800 4.8L V8
    Have a 2003 gmc 1500. 4.8. It has 130000 miles on it. It was all stock ran perfect. Everthing worked. Newly rebuilt 4l60 with about 2000 miles on it. Anyway, I put a btr stage 3 cam kit, cold air kit, trailblazer stall, longtube headers wuth cat delete and it has been tuned. Now all my lights...
  14. 4-Speed Automatic Transmission
    I had my 4l60e on my 07 new body style rebuilt last November 2021. Now I have very hard shift from 1st to 2nd. Everything I've researched is pointing to the 1-2 accumulator. Going to drop the pan and replace the old plastic one with a pinless Sonnax. Looking that the fluid the transmission man...
  15. Vortec 4800 4.8L V8
    When I start my truck and idle it has a knocking sound in park and I put it in gear it speeds up the noise beats the faster I go almost sounds like a sewing machine from the cab but it was doing that before and quit now it’s back again and I thought it was the torque converter but I’m not sure...
  16. Vortec 5300 5.3L V8
    Hello im new to this forum, i have a 2001 silverado v6 to v8 swap. Has a 5.3vortec,4l60e stage 2 w/shift kit and 2800stall, and 3.42 gears. When im driving on the highway my rpms are at 3200rpms at 60mph which i think its pretty high. Is this normal??
  17. 4-Speed Automatic Transmission
    2011 Chevrolet Silverado 1500 4.3 l V6 lu3 motor 4L60E transmission two-wheel drive extended cab rust free! 80,000 MI. Has had regular service intervals. The truck is slamming in to second gear. A few months ago it went into limp mode and it went haywire I did some research and changed the TPS...
  18. 4-Speed Automatic Transmission
    I have a 01 Silverado 5.3 2wd & I recently rebuilt the transmission (4L60) & before the rebuild I was missing 2nd & 3rd gear & it still has that same problem we swapped the solenoids twice thinking that was the problem but it wasn't anyone have any idea what it could be?
  19. 4-Speed Automatic Transmission
    Hey guys just got a 02 sierra and have flushed all the fluids and gotten all the lights turned off, new mas,, air filter, cleaned injectors, oil pan gasket, rear diff seals, and throttle position sensor. Engine runs like a champ but has a hard shift between 1-2 only when cold. Once it's ran for...
  20. 4-Speed Automatic Transmission
    I have a '93 Silverado C3500HD 7.4 engine and NV4500 transmission. I have never had a vehicle I enjoyed more. I had an accident in 2019 that Left me without the use of my "clutch foot". Here is my question, I have a donor truck that has an automatic, but it is diesel, and a C2500, can I by a...
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