Help Trans not shifting - Team Camaro Tech
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post #1 of 13 (permalink) Old Oct 23rd, 01, 08:16 AM Thread Starter
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Have a 350 auto trans 1 to 2 is ok but 2 to 3 is taking a long time to shift,its just hanging there it will shift after a while.
I replaced the filter and new fluid
should i replace the modulator it is only a year old need your help i hope i dont need a new trans.....
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post #2 of 13 (permalink) Old Oct 25th, 01, 12:49 AM
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Sounds like it could be the vac modulator to me too, but I'm no real expert. You've got a good manifold vacuum source hooked to it right?
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post #3 of 13 (permalink) Old Oct 26th, 01, 06:18 PM
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Check your gear linkage for both slop or tight operation. What I really suspect is a varnish build-up. It may improve somewhat now that you changed fluid. additives are available but I don't want to make any recommendations. Did the problem start after you changed the modulator? Check the entire vacuum line for cracks or swelling. Good luck!

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post #4 of 13 (permalink) Old Oct 27th, 01, 11:55 AM
Stephen Dale
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Sent a reply yesterday, but got lost in cyberspace I guess. Check your linkage for either tight or loose operation and also bent parts. I think it could be a problem with varnish build-up on the 2-3
shift valve, maybe the new fluid will help loosen it up with time.
Maybe an additive would help. Did your problem start after replacing the modulator? Two basic types plus an adjustable one are available.

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post #5 of 13 (permalink) Old Oct 27th, 01, 12:02 PM
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One more thought. Why is there a TH350 behind a 396? Could indicate clutch plate problem as well.

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post #6 of 13 (permalink) Old Oct 27th, 01, 06:06 PM
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by scott67ss396:
Have a 350 auto trans 1 to 2 is ok but 2 to 3 is taking a long time to shift,its just hanging there it will shift after a while.
I replaced the filter and new fluid
should i replace the modulator it is only a year old need your help i hope i dont need a new trans.....
<HR></BLOCKQUOTE>

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post #7 of 13 (permalink) Old Oct 27th, 01, 06:11 PM
 
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i am having the same problem in my circle track car. did not think of loosing vacum. we were thinking more along the lines of cluth pads worn.
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post #8 of 13 (permalink) Old Oct 27th, 01, 06:15 PM
 
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i am having the same problem in my circle track car. did not think of loosing vacum. we were thinking more along the lines of cluth pads worn.
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post #9 of 13 (permalink) Old Oct 29th, 01, 05:29 PM
 
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i am having the same problem. i talked to the transmission shop today that rebuilt my tranny for my truck, he said it could be low vaccum, modulator valve or the governor needs peplaced that located near the tail shaft. i am going the replace the governor on mine with a heaver one and check for vaccum leaks. hope this helps, by no means am i a expert. just trying to help
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post #10 of 13 (permalink) Old Oct 29th, 01, 05:44 PM
 
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i am having the same problem. i talked to the transmission shop today that rebuilt my tranny for my truck, he said it could be low vaccum, modulator valve or the governor needs peplaced that located near the tail shaft. i am going the replace the governor on mine with a heaver one and check for vaccum leaks. hope this helps, by no means am i a expert. just trying to help
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post #11 of 13 (permalink) Old Oct 30th, 01, 03:52 AM Thread Starter
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no the engine is a 350. I have ben told that it may be the kick down what do u think
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post #12 of 13 (permalink) Old Oct 31st, 01, 07:37 AM
 
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I've read off the camaro database that if its a 700-r4 tranny, they will not shift at 3/4 throttle plus, I found that out in my little 2.8 litter motor in 84, and was able to smoke a few nice cars because the motor held the R's b4 shifting. If its not shifting when she's to rugs try letting off at 4,500rpms+ and see if its shifts
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post #13 of 13 (permalink) Old Oct 31st, 01, 03:39 PM
 
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If you've got a hefty cam in there robbing your vacuum you can bet that's the problem.
My 396 chevelle has done the same thing with 2 different 350 turbos behind it. And no vac leaks. Soon to be m-22 in behind it..
I noticed that when I left off the pedal from full throttle in the 2-3 shift it would go in gear just fine. Slower than a nrick shifting from 2-3 at full throttle..


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