transmission

  1. LukeDM

    700R4 won’t stay in overdrive

    Howdy all. I have a 91 suburban with a 700R4 transmission that i have a few problems with. Also it may be designated as a 4L60, not positive about that. My main problem is that it won’t stay in overdrive once it warms up. After about 20 miles of highway driving, i can ease off the throttle and...
  2. R

    NP205 shift rail help!!

    NP205. Replacing the shift rail seals. Got the one shift rail closest to the transmission out, replaced seal, installed back in, put the roll pin back in and good to go. Now as far as the other rail, I can’t get it out!! I’ve removed the roll pin and have been pulling the crap out of it. Also...
  3. gill finn

    Slow Climb To The Top

    Hello all, I have an '84 C20 350 automatic, I believe it's a TH400, it seems to shift well from a stop, but when I get to a slight grade it will not drop into a lower gear. It used to, but no longer and as a result of course the engine will rev but that's it. Of course I can manually shift into...
  4. T

    "New Type Braided" Transmission Dipsticks

    I have been looking for a quality transmission dip stick for a 1989 700r4 that will go in my Chevy suburban. I want quality and something that wont leak. Everything I see online feels cheap and hokey. Can anyone here recommend a decent transmission dip stick setup? Id like this to mount on the...
  5. WhosCacti

    New GMC Owner with shifting troubles

    Hello squarebody community! I'm new to the world of 80s tech/ vehicles, but I'm eager to learn the workings! I've been working on my 1981 GMC G3500 5.7L V8 for about 8 or 9 months. Over the winter I had it stationary and parked so it hasn't been engaged with or running for a while. The past...
    • WhosCacti
    • Thread
    • automatic transmission shifting problem transmission
    • Replies: 38
    • Forum: Introduction
  6. C

    700R4 downshifting at any speed

    I have a 87 Chevy suburban v10, and it has a newer 700R4 tranny. I am wondering if it is normal for anybody else to be driving at any speed even highway and when you take your foot off the throttle, it automatically downshifts. And I know the TV cable is adjusted correctly. Any ideas would be...
  7. L

    Heatercore to transmission problems.

    Hey, I just finally had to replace my heater core in my 85 c10, had to special order the core off of summit so it took a few days to get here, the truck had to sit for about 3 days, and was operating just fine until I parked it, I drove it home, now, after taking that heater box off, replacing...
  8. K

    What is the best th350 rebuild kit?

    I have a 74 K20 with a th350 that ate my first/reverse clutch. I was wondering what you all have done in the past as far as tips and tricks, kits used, and what not to do. As of now I will be rebuilding the transmission myself unless I can find a reasonable replacement. Any way mostly curious...
    • Kalem
    • Thread
    • automatic transmission np203 th350 transmission
    • Replies: 1
    • Forum: Tech Discussion
  9. Big red square

    Transmission paint

    Has anyone painted the th350 and np203 transfer case. Want just regular silver like a factory semi shiny look.
  10. Kentucky Cobra

    Will a TH475 Transmission fit my 1989 Chevrolet suburban V1500 4x4?

    Hey y’all how y’all doing I’m new here but I burnt my 700R4 on my 89’ Suburban 4x4 and need to find a replacement and I had my friend who has bunch of suburbans say he has a TH475 with 8k miles on in and replaced filters and the works but I don’t know if it will fit. I wanna know if it will be a...
  11. DBinWW

    Transmission Swap Mishaps

    I bought an '89 4WD Suburban for its 700R4 transmission and swapped it into my '79 Sierra Classic, pictured here. There have been a number of challenges but that side of the transaction seems to have gone okay and the PU is like a new rig. On the other hand, the 350 going into the Suburban is a...
  12. TFerguson

    Transmission Vendor Recommendations

    Greetings to all. I'm on the hunt for a new/reman 700R4 to replace the ailing unit in my '90 Blazer. It's running a reman stock-spec TBI 350 4-bolt, so not looking for anything too fancy-shmancy. I really just want something that will bolt in, be reliable for at least 100k miles, and capable of...
  13. Zayshley

    Fair price for a 4x4 TH350?

    I have a TH350 (no torque converter + unknown km) from a ‘80 Blazer that came with a NP205, was told it was working perfect before it was pulled out. Just wondering what’s a fair price to ask for it. ($CAD)
  14. R

    SM465 output shaft bearing

    I have my transfer case and adapter out of my truck, cleaning and resealing. I noticed the bearing locknut is locked with a tab on it but the nut moves easily by hand- it is not going anywhere but I was wondering if it should be tighter? The truck is an all original 76 K10 that was not abused...
  15. M

    L480 np241 swap transmission support or cross member help K20

    Ok I have swapped in a L480 with np241 and can not figure out a cross member to support the transmission and transferase in a 1979 K20. Does anyone know what I can use, buy, build, for this?
  16. A

    Muncie Swap Botch Job Manual Clutch

    Hello fellow square body owners, I recently bought my first squarebody (1987 gmc) and it was swapped from an sm465 to a Muncie m20 but it was done extremely poorly. First of all I pulled the transmission shortly after purchasing because it wouldn't shift right (couldn't even find the right...
  17. R

    Transmission crack help

    Afternoon folks. I have a question, I’ve got a 1978 Chevy Scottsdale with an automatic transmission that the drive gear had stopped working so I took the pan off and found a hole in the metal that had broken (see pictures) I couldn’t find any metal in the fluid. I have no experience with...
  18. Mojave_Muse

    some warmth from below, normal?

    specs: 82 c10 burb 2wd 6.2 700r4 now that i've got my big brown box legal i'm able to tool around town, get all the juices circulated, listen for odd behavior etc. so they can be addressed before I take it camping. after hearing my debt card cry putting fuel in it I note that the trans humb...
  19. Darstrom

    Speedometer cable showing less than half

    I recently replaced my speedometer cable since the speedo was bouncing a lot. Now the problem is that it's showing less than half speed. Took out the speedometer and checked it, seems to be working fine. And from what I can tell the gearing for the cable is inside the gearbox? Truck is a GMC...
    • Darstrom
    • Thread
    • cable guages instrument panel speed speedo transmission wire
    • Replies: 2
    • Forum: Tech Discussion
  20. C

    Transmission identification help

    I have a 3 speed manual on my 1984 C10. The bell housing is aluminum. But, the transmission and the extension housing are iron. Using a transmission identification guide https://documents.holley.com/techlibrary_manual.pdf I believe my transmission is a Saginaw 343, but my extension housing is a...
  21. Preston Tucker

    HELP! Nv4500 Swap, so many transfer cases so little time.

    Ive been looking on here for hours and could not find a thread with the information I need, maybe you all can help! Anything is appreciated. I am converting my 1974 k25 from a burnt th350 to a Nv4500. I have all the hydro stuff for the cab out of an 87 parts rig and tonight I bought a whole...
  22. Giant Rock

    Should I service in anyway the transmission on my 1990 Suburban with over 200k miles?

    I bought this Suburban a few months ago, the truck shifts gears perfectly, but general wisdom says to change all the fluids because who knows what the PO did. However, I've been researching about the Transmission and I've come across multiple threads in other forums that say things like: "At...
  23. T

    4L80 Question

    Hi Everyone, I have an 85 350/TH400. Swapping to a 4L80 for the OD. Not a 4L80E, its a hydramatic 4L80. Does this use a TV cable like the 700R4 or cable like the TH350/TH400? Thanks in advance.
  24. 78ScottsGirl

    TH350 help plz

    Okay y'all this Tennessee gal needs some reliable info. How in the world do I get my transmission spring (the one the the kickdown cable hooks to in the tranny) back into the tranny after fixing the leak? I've chased every forum and searched till my eyes are crossed and my head is hurting. I'm...
  25. M

    Transmission and TCase identification (Muncie + NP)

    Based on reading online it sounds like this 4-speed with Low gear is a Muncie SM465 and the 4x4 Transfer case is NP205 - any recommendations for bolt pattern identification or otherwise? Where the truck currently sits boxed in can’t easily crawl under, but will move soon. Thanks - barn...

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