C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Cold auto trans slams into D

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Old Dec 26, 2005 | 12:13 AM
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Default Cold auto trans slams into D

I let the car (89 automatic) warm up for 10 min. back out the drive put her into D and wham she slams in. I just put new fluid and filter in. She only does this cold. I used the SEARCH could not find info. I do not feel any shifting problems other than the D-slam. The car has 96,000 miles,I checked for vacum leaks with propane none noticed. Any thoughts. Thanks Pete
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Old Dec 26, 2005 | 01:39 AM
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are you sure that this is much of a problem? whenever my tranny didn't slam into the gears, only then there was something wrong.
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Old Dec 26, 2005 | 07:35 AM
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It's normal. Even after I had mine rebuilt when it failed a few years ago, the owner of the shop told me that it's normal. The higher your idle (like when it's cold) the harder it will do it. It's not too bad at about 700-800 RPM.
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Old Dec 26, 2005 | 08:23 AM
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Originally Posted by NJPetes89
I let the car (89 automatic) warm up for 10 min. back out the drive put her into D and wham she slams in. I just put new fluid and filter in. She only does this cold. I used the SEARCH could not find info. I do not feel any shifting problems other than the D-slam. The car has 96,000 miles,I checked for vacum leaks with propane none noticed. Any thoughts. Thanks Pete
Unless the idle is very high, this should not be. In 87 gm began using an aux valve body in the trans.One of the 2 valves it contains is called the abuse vale. It's purpose is to cushion the the drive hit. If you have swapped in an older trans, this may explain it. Otherwise the valve may be hung up. If the idle is very high(over 1100 or so) it may bang anyway.
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Old Dec 26, 2005 | 08:50 AM
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Default Great

I will let the car idle down better because that slam is annoying! Glad to hear that it is not symtoms of a failing transmission. This board and members are a great resource I am glad to be part of it! Thanks Pete
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