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  1. NickTransmissions

    Newly rebuilt 4l80e (700 miles) now won’t shift into 3rd gear

    There is no "kick down" linkage or cable for the electronically controlled transmissions as all shifting is comp-controlled. Have you contacted the builder to report the symptoms? If so, what did he say? Any problems in reverse?
  2. NickTransmissions

    Is this a TH350 & which flex plate???

    Are you asking about transmission internals or suspension parts? Link arms and bushings would be suspension (control arms, their bushings, sway bar and links, etc). If you're asking about transmission internals, at least those relevant to shift kits, you have the valve body, with valves...
  3. NickTransmissions

    1988 R20 2WD TH 400 to 4WD

    To whom it may concern - just swap the output shaft..Takes literally 10 minutes to evacuate the case, swap the shaft then another 10-15 minutes for reassembly. not rocket science and certainly not worth hacking the output shaft, potentially ruining it...Yes, I know there are people on Youtube...
  4. NickTransmissions

    Keeping heat out of Th400

    The 475s have the same ratios as the 400s, as @legopnuematic stated; only diff is the straight cut gear set. Sounds like the TH400 was on its last legs. 5k is nothing for those units. 700R4s and 4L60Es are rated for 5k towing/hauling. If you plan to take the output shaft out, you are rebuilding...
  5. NickTransmissions

    700r4 only shifts into 4th once or twice...then never again

    Call Central Valve Bodies in Oklahoma or Valve Body Exchange. I am not sure Sonnax is making those but you can try them as well. I stock pile VBs for my builds and have the customer swap them in and out until one works. I let customers know this up front so they're aware a bit of work on their...
  6. NickTransmissions

    700r4 shake?

    Check trans rear mount...If worn, can cause vibrations, even in neutral (but not common). If the vibration is very high frequency, I'd suspect rear end, specifically worn pinion bearings or pinion depth just slightly off. I know you said the rear end was new but the couple instances where high...
  7. NickTransmissions

    700r4 only shifts into 4th once or twice...then never again

    I have had this issue with various 700R4 valve bodies over the years (no 3-4 upshift) and while it's likely the 3-4 shift valve, 3-4 sequencing valve and/or 4-3 relay valve, you would need to have the Sonnax reamers to ream the bore for the 3-4 relay/4-3 sequence valve train to install their...
  8. NickTransmissions

    700r4 Overdrive

    Outside of towing moderate to heavy loads, there is zero harm or exposure risk to the transmission by simply keeping it in the primary drive range position. I have never heard of anyone's transmission failing just because they keep it in drive. None of the thousands that I have built over the...
  9. NickTransmissions

    4L60E Information Thread (Includes 4L65/70/75)

    I believe there was adaptive logic used in the shift strategies prior to the ISS but I am not 100% sure. Clinebarger is a very knowledgeable builder who's btdt; I have leveraged numerous posts/threads of his as I was coming up the learning curve, particularly on TH400s and 4L80Es which I...
  10. NickTransmissions

    Th350 behind 4.8ls

    No. Also, please quote my post if you would like me to respond. I dont get notifications which is intentional. Let us know what your modulator vacuum signal is. If it's at least 13Hg and modulator itself is functional, mod valve not stuck then the problem is inside the trans
  11. NickTransmissions

    Th350 behind 4.8ls

    Are you still having problems w/your TH350? If so, are the symptoms more or less the same as reflected in your first post (takes ~3000 RPM to get it moving when in Drive)? If so, have you checked vacuum at the modulator? What was the reading?
  12. NickTransmissions

    700r4 only shifts into 4th once or twice...then never again

    I replied to your question on Youtube a little while ago...Bottom line - you need to confirm the circuit is mechanically healthy by air checking the 4th apply cirucit via the case which involves removing the valve body, spacer plate, etc...The little hole on the pan rail is an exhaust port - you...
  13. NickTransmissions

    Struggling with my 700R4

    Your pressures at idle are a little on the higher side but that's to be expected as Gearstar likely installed larger ratio boost/reverse boost valves as well as a stiffer/longer TV boost spring in the valve body. That said, what are your pressures at full TV? If you didn't do a test to see how...
  14. NickTransmissions

    Fresh rebuilt 700r4

    Five months??? Did he install a flux capacitor? If so, you should baby it until it's ready for time travel then punch it to 88mph and enjoy the trip! Make sure you adjsut the TV cable correctly and verify your adjustments w/a pressure gauge, assuming you haven't done this already...Other than...
  15. NickTransmissions

    700R4 shifts erratically

    Yes, you can look through the kits that are on eBay - most of them are being sold by Transpartswarehouse.com...TPWH is one of the largest transmission parts retailers in the country; Transstar is another such large retailer with. some brick and mortar distribution hubs...Based in Redding, CA...
  16. NickTransmissions

    700R4 shifts erratically

    Let me help you with some terminology: 1. "1-2" shift governor - not sure what you're referring to but the likely relevant parts are the 1-2 accumulator housing, governor or 1-2 shift valve/throttle valve train in the valve body 2. "Rods and pistons" - lol, the valve body isnt an engine...
  17. NickTransmissions

    1984 Chevrolet k10 700r4 id help

    The particular year isn't as important as vintage (version) of 700R4 that you may have. There are five different vintages of 700r4 - they and their differentiating characteristics are as follows: > 1982-E1984: Non-aux valve body; 27 spline input shaft w/narrow bore pump stator; VB provisioned...
  18. NickTransmissions

    K10 1983 700r4 installation help needed

    Obtain a transmission jack - harbor freight sells them for a couple hundred bucks or so. They make re-marrying the transmission to the engine quick, very easy and dramatically reduces the risk of breaking something. Fill the converter with a quart or two of fluid prior to installing it onto the...
  19. NickTransmissions

    700R4 Transmission Questions/Issues

    Do you mean to say, "2-4 band"? There's no 3-4 band in these units...There's a band that applies in 2nd and 4th gear as well as a 3-4 clutch pack that comes on in 3rd and stays on in 4th....
  20. NickTransmissions

    700R4 Information Thread

    No RTV; it wont work - as soon as you put some, trans fluid will contaminate it, rendering it useless. The o-ring im talking about goes around the entire pump housing. But sounds like the leak is coming from the bolt holes so new washer-seals should fix it.
  21. NickTransmissions

    700R4 Information Thread

    No RTV; just install new sealing washers. Also verify it's leaking from the bolts and not the pump o-ring (the o-ring seals the outer perimeter of the pump assy to the case). I'm assuming you will be pulling the trans to reseal the pump? Or is there enough room between the bolts and front of...
  22. NickTransmissions

    "Monster" brand TH350?

    Friends Dont Let Friends by Monster transmissions. Or any "big box" reman company's units for that matter. There are very, very few large, well known companies that build good, reliable units. The best transmissions come from knowledgeable local builders or niche performance shops. $3,000...
  23. NickTransmissions

    1971 Dart Swinger

    Nice job, @legopnuematic! Glad you found the causes of the unit's failure at the direct clutch...Very common in those transmissions to see compromised lip seals in the front (direct) clutch.
  24. NickTransmissions

    4L60E interchange compatability question

    That applies to the 4L80Es, not the 4L60Es. The 4L60Es meant for Gen3 small blocks use a 300mm input shaft (no pilot journal), 7-1/4 inch stator tube, different bell housing (deeper than Gen 1 SBCs), torque converter and flex plate while the 4L60Es meant for Gen1/2 small blocks use a 298mm...
  25. NickTransmissions

    4L60E interchange compatability question

    Those two transmissions are not physically interchangeable without adaptors for each respective engine application. Why not rebuild your 1997 K1500's 4L60E?

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