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Chevy S10 - GMC S15 and Sonoma Transmission Problems



  • flip69flip69 Posts: 1
    i have a 00 Z-R2 with the same problem, i was wandering what you found out about your clunk.
  • I have a similar problem...I own a 99 s-10 manual trans..
    when taking off from a stop light, pushing the clutch in and shifting into first then releasing the clutch and pressing the accelerator about the moment the clutch is released I hear a loud "CLUNK" and things work fine though now after a few weeks of hearing this, I noticed this occurring similarly after second gear. still drives and operates fine just that disturbing noise. Any thoughts?
  • I have an 02 S10 2.2L 5 speed manual trans. My truck has 130,000 miles on it. I am having some issues when down shifting. I'm changing the clutch, but haven't had any problems with the clutch. When I gear down, the transmission makes a, what sounds like a grinding sound, not only can you here it, but you can feel it in the stick. I've had two different dealership service departments drive the truck, and they feel there is definatly something wrong. ( Duhhh) But I'm just curious, does this sound like a sincro problem or something else?
  • Just bought a '93 sonoma 2.8 v6 and get grinding noise after shifting in gear 1 through 5. Is this a common problem? And if so, what could be the cause? I would appreciate any information anyone can give me. Thanks
  • arienarien Posts: 4
    My truck has begun "surging" between 40-50 mph. Feels like it's going in and out of overdrive. Mechanic does not know why. Trans fluid is fine. Any suggestions? Does not affect speedometer, and no engine codes.
  • How does the rear of the front driveshaft unhook----95 sonoma 4x4??
  • Sounds like a guy I know.
    1] There is no dipstick on any Manual Tranny in the last Century.
    2] I'll bet it's new tranny time.
    You can always cripple it over to a tranny shop to confirm.

    But that's why they have fill plugs on trannys, and change out the fluid every 30,000 at the max.

    All trannys produce shrapnel and all it's doing is mixing into all the bearings till they fall apart like rotten teeth.
  • Have you ever changed the oil in the tranny?

    If it's whining at all going through the gears, it's definitely low.

    Clunking can come from several points, but at the point you mentioned, I would guess the pilot bearing that is press fit at the crank shaft supporting the input shaft of tranny.

    This brass bushing or maybe a real bearing keeps the shaft centered and also is the main support for the clutch disc. The clutch disc if not perfectly centered will Chatter badly at first as it tries to center itself just as it's being clamped solid between the pressure plate and flywheel.

    You can test this yourself with someone holding in on the clutch pedal and with inspection cover off see if you can move disc up or sideways. It should not.

    Only cure is remove tranny.
    Good Luck
  • arienarien Posts: 4
    No reply to last message so I will try again. My truck has been "surging", feels like in and out of overdrive. Mostly b/w 40-50 mph, but now at other speeds. Had a diagnostic, trans is supposedly shifting fine. Told it was the TPS. It is sucking gas like crazy and is hesitating when I accel. HELP!! Any ideas?
  • 1996 Chevy S10 Regular Cab with 4.3 L V6 and 5 speed manual transmission. The truck has 78,000 miles and I just had the clutch, flywheel, clutch bearings and slave cylinder replaced. My question has to do with the manual gear shifter. Before it used to stay centered on 3rd and 4th gear when in neutral but after the clutch repair it just slops back and forth. I can’t seem to find a detailed schematic to see if a return spring was left off or what the problem might be. The mechanic said this was “normal” and didn’t see a problem. Any ideas on what could be causing this? Thanks for the assistance.
  • :shades: :shades: I just a 96 S10 2.2 liter 4l60E Overdrive Automatic. It had 82,000 miles in good condition. the shift seleonoids are bad only had 2nd and 3rd gear. I took the truck to the transmission shop, I had the transmission flushed, new fluid filter and seleonoids, the problem was fixed. Axp 1,000 miles later while I was driving in town it instantly downshifted into 1st like someone was putting the brakes, but only for 5-10 seconds. Then it seemed fine. The next morning I was driving to work, about 5 miles, and about the time I got to work it did it again. I seem to have all my gears, but it is doing it all the time now. I can not get up to speed, up to 20 mph. I was told that the automatic transmission behind the 4 cyclinders are prone to failure is there any truth to that, if it is bad and have to have it replaced, I don't want to have to worry about it failing early again.
  • gonogogonogo Posts: 871
    Take it to a good independent transmission shop and have them scan it with a transmission capable scanner. That will give you a better idea of what is going on.
    From what I have read the 4 fails about the same as the 6cyl.
    My 4 auto has only 53K, so I don't know how long mine will last.
  • I dont know! But my dad just gave me a 1998 S10 LS three weeks ago and the reverse gear slipped three or four times and went out yesterday, but still works fine otherwise. Any ideas let me know please? My friend said it could be the linkage and I could fix it, I have no idea about this.
  • Ok, my problem with my transmission is this.. i have a 2000 gmc sonoma, 2.2. 2x4.. automatic... i will be cruising down the road in top gear(4th) .. and it will downshift into 3rd gear.. it will not shift back up. even if you floor it.. the only way i can get it to go back into 4th.. is to pull over and turn the ing, completely off, and turn it back on.. that will fix it momentarily. only for it to happen again about 15 mins later.. ive noticed it only happens on long trips. its ver irritatiing. after about an hour of freeway driving.. you cant just pull over and pull back out, u have to acutally turn the car off for it to be fixed.. also.. the service engine soon light is on, and its gives a code for the transmission.. does anyone have a clue as to whats causing this.. anyhelp will be greatly appreciated..
  • gonogogonogo Posts: 871
    I bet it will be PO 1870 slipping. The latest information I got on this malfunction are worn pump bushings. Earlier the fix was repaired or remanufactured valve body.
    The thing is to replace the worn pump bushings the transmission has to come out, the valve body can be done in place.
    You need to go to a good independent transmission shop, stay away from the chain shops, they just want to replace the complete unit.
  • yea thats the code it was throwing.. so i dont need to pay for a complete rebuild? or about what would that run me $
  • gonogogonogo Posts: 871
    Can’t help on pricing, you could ask for an estimate from a good independent transmission shop. A repair can be done, but if high mileage they will recommend a rebuild.
  • hoodlatchhoodlatch Mid-westPosts: 255
    Help! I’m at my wits end. Did you ever see a tranny that throws all its codes at one time? It’s an automatic on a 97 S10, 4.3 with 90k on it. In our case it is intermittent. Sometimes it will allow you to clear all the codes and it runs beautiful. Then out of the blue is goes snafu and has all the codes you can mention on a tranny. I'm confident it’s an electrical thing. I pulled the pan, replaced the two solenoids to the tcc, and replaced the filter, fluid. All of which looked A OK. The bottom of the pan was clean; the fluid was bright red from where I changed it last year. When I put it back together and backed it out of the shop the light came on and still had all the codes it had before. Basically I wasted half a day not to mention the parts cost. What ever happened to good ole power-glides? If you have any suggestions on what magic does the trick please let us know? John :cry:
  • gonogogonogo Posts: 871
    Remove the large 20 pin plug into the transmission and see if it has transmission fluid in it. This has been an issue at times.
  • hoodlatchhoodlatch Mid-westPosts: 255
    Thanks for the reply. Actually the 20 pin plug you mentioned got changed out with the wiring harness that goes to one of the solenoids that I changed last week end. We pulled and inspected all the plugs to the PCM, fuses, associated wiring, all checked out. I think there's an open circuit somewhere. But it doesn't do it all the time. That's the frustrating part. :confuse:
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