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Thread: dumb trans questioin...
          
   
   

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  1. #1
    muteboy49's Avatar
    muteboy49 is offline CHR Member Visit my Photo Gallery
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    dumb trans questioin...

     



    ok if i buy a trans rebuild kit for my trans it makes it like new right?
    how hard is it to rebuild a trans?

  2. #2
    76GMC1500 is offline CHR Member Visit my Photo Gallery
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    First, buy this book: http://www.amazon.com/gp/product/089...Fencoding=UTF8

    It depends on how extensive of a kit and what is wrong with your transmission. Most kits don't come with bearings and such and none com with front pumps. I recently rebuilt my TH350. I used the Hughes kit that does come with bushings. I used a chisel to remove the old bushings and made some bushing drivers out of some cheap sockets I had laying around. The pistons that operate the clutches can, with the exception of one, be removed with c-clamps. The one on the rear of the case required a special tool. I made one using parts of a harmonic damper pulley, some bolts, a piece of a turnbuckle, and a big washer. You will have to assemble the transmission sever times because you have to select the correct thickness of thrust bearings to put in the transmission. All of this will make your transmission like new. It was very high up on the difficulty scale, especially cutting out bushings with a chisel. I didn't need to change any bearings except for the bearing between the front pump housing and torque converter. You may not need to change any at all. In that case, to freshen up a transmission with new clutches and no hard parts isn't particularly difficult. I also had to replace my front planetary set.

  3. #3
    muteboy49's Avatar
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    to be totally honest i dont know what it needs. i know i have no 2nd 3rd or OD

  4. #4
    76GMC1500 is offline CHR Member Visit my Photo Gallery
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    I had a thrust bearing failure on my front planetary set that caused of of the gears to wear through the carrier. No big deal, the other 3 gears in the planetary set took up the load. But, as the gear wore through it filled the tranny fluid with metal shavings that eventually plugged the filter. I lost all gears forward and reverse when this happened.



    I don't know the 4 speeds well, but I would guess that you are either not getting fluid pressure to any of the pistons that operate the front planetary set or your the clutches for the front planetary are severely worn. Low and reverse are done by the rear planetary in the 3 speed which would explain why you have low and reverse but no other gears.

  5. #5
    tl34ru is offline CHR Member Visit my Photo Gallery
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    What trans? 700r4

  6. #6
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    yes sir it is.

  7. #7
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    I lost 1st and OD...it was a shifting solenoid (fairly cheap)...it was a 4L60E, so it might not be the same. Just thought I'd throw it out there.
    Wes...aka "BigRed"

  8. #8
    tl34ru is offline CHR Member Visit my Photo Gallery
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    First, i would check the govenor, on the passenger side just in of the tail
    housing pull it hold it gear up move the weights and you should be able to see the valve move in the slot in the middle. What does the fluid look like
    color, smell, etc. How many miles, how long has it been for service.
    Terry

  9. #9
    76GMC1500 is offline CHR Member Visit my Photo Gallery
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    Duh, I forgot to ask. Does the transmission just not shift out of first or does it shift out and feel like it's in neutral.

    If it wont shift out of first, that is easy. It's either a governor problem like stated above, but more likely your vacuum line from the intake manifold to the vacuum modulator is not hooked up, damaged, or kinked. Possibly, the vacuum modulator is bad, you could replace it to see what happens. It's one bolt and costs about $7.

  10. #10
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    umm the trans has 140000 miles on it. i had 1st and 2nd but then 2nd went on me too but before it when it shifted outta 1st it sounded like it was going into neutral (thats what D and OD did too) and now i got just 1st and reverse
    and tl34ru i kinda get what your sayin but i kinda dont can you explain it a bit better to a retard like me?
    thanks guys

  11. #11
    tl34ru is offline CHR Member Visit my Photo Gallery
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    Chances are the froward clutch plates are worn out along with the 3-4 clutch
    plates, the govenor is what makes the trans shift govenor pressure overcomes
    throttle pressure to shift the trans the detent cable at the throttle body controls the shift points.If you was to build this trans my suggestion would be
    look up atsg (automatic trans service group) on the internet get a manual from them and read through it look at what tools you will need, as for a parts
    I perfer raybestos clutches.

  12. #12
    tl34ru is offline CHR Member Visit my Photo Gallery
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    I would also put a new/reman torque converter it

  13. #13
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    well im planning on a performance rebuild so i can stuff it in my camaro. so besides the book i would need a performance rebuild kit?

  14. #14
    76GMC1500 is offline CHR Member Visit my Photo Gallery
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    Don't get that book for your tranny, it is for a turbo 350. You'll need one for a 700r4 which I can't find at the moment. I recommend you buy the book before buying your parts and read through it. There are a lot of special tools, some of them you may need to locate. For most you will be able to improvise. I was able to improvise all of them on my 350, but the 700r4 is a little more complex. To do a performance rebuild, just grab yourself a good set of clutches and steels. The Hughes kits get the job done. They don't come with any valve body modifications, but even without, my 1-2 full throttle shift is firm enough to chirp my 265 wide tires.

  15. #15
    muteboy49's Avatar
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    ok thanks. i gotta wait till i get my 3 speed to see if ill need a new driveshaft. if i do im rebuilding the R4 instead

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