Re: O.T. 88 Chevy 1500 4 x 4 Auto Trans Problem

Posted by Allan In NE on December 11, 2006 at 05:41:13 from (148.78.243.24):

In Reply to: O.T. 88 Chevy 1500 4 x 4 Auto Trans Problem posted by migraine on December 10, 2006 at 17:51:47:

Hi Ol' Pard,

I agree; it really does sound like a timing issue.

The way that works is that the governor pressure (ground speed) is always trying to push the transmission into the next higher gear. At the same time tho, pressure on your throttle is always trying to hold it back and tries to keep it from shifting up.

As road speed increases and the throttle pressure eases off, the various ratio thresholds are overcome and the transmission shifts up in an orderly manner.

Now, you must have a good supply of governor oil because you have that triple shift effect going on, but the shifting is occurring at the wrong time and it is stacking. This indicates we ample governor even for the higher 3rd gear. Therefore, the symptom is pointing at the only other player in the game. The throttle pressure or something that "affects" that pressure is keeping the trasmission from sequencing.

I'd pull the dipstick and make sure the oil is nice and pink and up to level. Secondly, make darned sure you have a good fuel filter; this is critical because it directly affects throttle pressure.

If the transmission feels okay otherwise and in particular is not slow to engage reverse when cold (indicating a plugged transmission filter), I would buy a new throttle cable and the boot seal.

Don't even mess with that old one because they stretch, they fray and they just plain "stick" (Especially, if you've changed engines). Just go get another cable and boot. Make absolutely sure it is adjusted correctly and then see where you are at that point.

It will either cure your problem or indicate something deeper is going on and you're only out the minimal cost of that cable.

Allan

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