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  1. BrickRunner

    1989 4Runner R150F Rebuild

    It idles super smooth now and is noticeably quieter. It feels smoother revving up and letting off. I even had to turn the idle screw almost all of the way in. I'm guessing it needs less fuel at idle due to the better atomization from the fancy injectors. Buuuuuuut... None of this translates...
  2. BrickRunner

    1989 4Runner R150F Rebuild

    Survived another road trip, this time to Yellowstone and the Grand Tetons! I hit 275,000 miles on the way back in the town of Smoot Wyoming, just as it was starting to snow. Snow?! In October?! Sorcery! (yes, I am from California...) Highway 89 from Jackson to Brigham City is a gorgeous drive...
  3. BrickRunner

    1989 4Runner R150F Rebuild

    I'm still running MT-90 and have been happy with it. Downshifting to 1st will always be notchy, I think. That's been my experience with all of the manuals that I have driven. 2nd is fine in mine, but 3rd is notchy depending whether I'm romping on it or just cruising. How do you like your short...
  4. BrickRunner

    1989 4Runner R150F Rebuild

    I've put another 4000 miles on it, including an 1100 mile road trip to Tahoe and Owens Valley and back. So far so good! Fourth gear has had noise since I put it back together. The noise doesn't seem to have changed over the 4000 miles. I think its the countershaft idling with no load.
  5. BrickRunner

    1989 4Runner R150F Rebuild

    Back on the road with all gears accounted for!
  6. BrickRunner

    1989 4Runner R150F Rebuild

    Before I tore the transmission apart I had replaced the shifter housing to see if that helped. It didn't prevent the popout, but it did make shifting smoother and tighter! The pins on the old one were quite wiggly.
  7. BrickRunner

    1989 4Runner R150F Rebuild

    Nuke it from orbit, the only way to be sure. The Marlin bearing retainer is stout and a nice tight fit. When I was just about done and installing the shift selector lever, I felt and heard a little tink, ugh!
  8. BrickRunner

    1989 4Runner R150F Rebuild

    Output shaft play in the bearing retainer was one of my thoughts as well, as that would allow the input and output shafts slightly separate. If you are going to use a used input shaft, you want to check for wear on the tip where in goes into the pilot bearing, as well as wear on the teeth where...
  9. BrickRunner

    1989 4Runner R150F Rebuild

    I got the transmission apart as far as I need to to fix 4th. The synchro for 4th is trashed, the edges of the teeth are smushed and burred, and the thin sections where the hub keys fit are broken or in the process of breaking. Thankfully I found both of the missing bits: The 3rd gear synchro...
  10. BrickRunner

    1989 4Runner R150F Rebuild

    I don't know year breaks specifically, but different years had slight differences. In my R150F, 5th gear was held on to the countershaft with a stake nut, whereas on the new AX15 countershaft I put in, 5th gear is held on by a snap ring.
  11. BrickRunner

    1989 4Runner R150F Rebuild

    I think initially it was the shockproof oil being too slippery, causing the synchro to not line up properly with the input shaft, preventing it from getting fully into gear. If I did manage to get it into gear by rev matching or dumb luck, it would stay in gear and not pop out. It started right...
  12. BrickRunner

    1989 4Runner R150F Rebuild

    Whelp... It's out again... The damage was done, and repeatedly trying to hold it into gear only made things worse (Duh!). Leave it to me to destroy a Marlin Shift Fork. At least it's a good excuse to put in the Marlin's Heavy Duty Bearing Retainer while I'm in there this time!
  13. BrickRunner

    1989 4Runner R150F Rebuild

    And just for fun:
  14. BrickRunner

    1989 4Runner R150F Rebuild

    I've switched back to Redline MT-90. 4th gear started popping out occasionally while shifting lazily. Upon further reading on Redline Heavy Shockproof: Not recommended for most synchro applications due to the product's extreme slipperiness I've only done one test drive since switching back...
  15. BrickRunner

    1989 4Runner R150F Rebuild

    This time around I am running Redline Heavy Shockproof (looks like Pepto-bismal) switched back to Redline MT-90 after ~7000 miles in the transmission and Valvoline 80W-90 in the transfercase, so far so good. I used to run Redline MT-90 in the 4Runner (I still do in my MR2) and it worked great...
  16. BrickRunner

    1989 4Runner R150F Rebuild

    The trick is to take LOTS of pictures, and also bag and label everything! I don't remember exactly where I first read about it (probably Pirate4x4), but the R150 and the AX15 were both made by Aisin-Warner and share most of the same guts. I have 5.29's on 33's so I was looking to bring the...
  17. BrickRunner

    1989 4Runner R150F Rebuild

    This was definitely the most challenging vehicle project I have done, but it was totally worth it. The gearbox is no longer a mystery and it shifts like new! I was getting 16 to 17 mpg, but recently got 18 mpg cruising up to Modesto from Ojai. New bearings, new oil, or higher 5th or some combo...
  18. BrickRunner

    1989 4Runner R150F Rebuild

  19. BrickRunner

    1989 4Runner R150F Rebuild

  20. BrickRunner

    1989 4Runner R150F Rebuild

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