transmission help

[caddyman379]

well my experience has been that they go because of age, they get hard and brittle and one day that vacuum, even thought its not alot, just kills it. Plus, think about all the heating/cooling cycles its subjected to.

[Ian Szgatti]

Originally Posted by caddyman379

well my experience has been that they go because of age, they get hard and brittle and one day that vacuum, even thought its not alot, just kills it. Plus, think about all the heating/cooling cycles its subjected to.

it is just a rubber diaphram, so that makes total sense

[chevyguy93]

okay. so heres the update.
Installed a new vacuum modulator and checked the governor. Still the same problem.

While driving, it shifts a little late from first into second. When you get around 44kms/h (about time for it to shift into 3rd) it slips and goes into neutral. You have to let your foot off the gas, and slowly press it in order for it to shift into 3rd.

I believe I did everything I could. I now believe that the problem is inside the transmission itself. I'm going to be phoning around for prices on used transmissions and debating whether I should sell it as-is.

[Ian Szgatti]

Originally Posted by chevyguy93

okay. so heres the update.
Installed a new vacuum modulator and checked the governor. Still the same problem.

While driving, it shifts a little late from first into second. When you get around 44kms/h (about time for it to shift into 3rd) it slips and goes into neutral. You have to let your foot off the gas, and slowly press it in order for it to shift into 3rd.

I believe I did everything I could. I now believe that the problem is inside the transmission itself. I'm going to be phoning around for prices on used transmissions and debating whether I should sell it as-is.

So you noticed no difference at all?
Before replacing, your next step should be checking the shift solenoids... you don't have to have the trans pulled for that, just have to take off the pan... that may not be entirely possible for you alone to do, but it's an option when concidering service. How much did you pay for the shift solenoid?

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Originally Posted by chevyguy93

okay. so heres the update.
Installed a new vacuum modulator and checked the governor. Still the same problem.

While driving, it shifts a little late from first into second. When you get around 44kms/h (about time for it to shift into 3rd) it slips and goes into neutral. You have to let your foot off the gas, and slowly press it in order for it to shift into 3rd.

I believe I did everything I could. I now believe that the problem is inside the transmission itself. I'm going to be phoning around for prices on used transmissions and debating whether I should sell it as-is.

Im sorry but its my experience, as the son of a trans rebuilder, that your transmission is due for an overhaul. Usually on GM FWD transmissions, especially of the era you are speaking of - the forward clutches and so forth are worn beyond any further service duty. You can buy a rebuilt unit on ebay or from a local rebuilder and R&R.

We've told customers before who dont want to spend the $$ to actually disconnect the modulator and put a screw in the vacuum hose. You "might" get a few more miles out of it this way.
What transmission model do you have (4T60E? 440T?) How many miles?

[caddyman379]

well, that is certainly true. But before you do any of that, (this is a generic fix i know) you should check the tranny fluid and ensure its clean, and drain some and add some Seafoam. I've heard good stuff about it. I've never used it. Out of curosity, if you go down the floor from a standstill, does it redline? It's supposed to shift at or slightly below redline.