Join Date: Oct 2005
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Re: transmission kicking
changing the filter is a first step.
next, check the linkage. both for the kick down cable (if you have one) and to make sure that your shift thingy on the side of the trans is popping into each gear properly. i don't know how your shifter is rigged up, but you want to make sure that you are "clicking" totally into each gear. if it is a little off, it will cause it to kick. you are trying to be in 2 gears at the same time basically.
to check, i always disconnect the linkage from the trans. then i have someone shift the truck into each gear on the column how ever you have it rigged up. move the trans thingy into each respective gear that the truck's shifter current position. make sure the linkage slips together without anything being out of line. if it is, your forcing the trans to be in 2 gears at once.
if you have the pan already off doing the fluid swap, you can double check it with your eyes. you'll see the little follower and where it fits into a tooth like thing on a spring inside the trans, just inboard of where the rod goes into the trans.
with that said, all your chevy trans have a little kick. i have had all the major trans at some point, th400, th350, a few 700r4s.
the kick comes from two things. one is the trans are a little worn on some. so, the kick is it grabbing between gears because clearances are a little loose. the other kicks are because a few of the trans were built up. the quicker the trans shifts and grabs between ranges, the more HP it can take without ripping apart the clutches and bands. the kick comes from one clutch or band letting go, and the other grabbing right away. this allows for minimum wear.
if it were too smooth, it would mean that one is starting to grip while the other has not quite let go. this causes excessive wear. mix this with a warmed over small block and your trans will have a short life.
i'd check the linkage first. esp if it was rebuilt. they might have just bolted it back together and not checked.