Locking dipstick

ATI Performance 973081 Transmission Dipstick Tube Lock - Bing
This won't help you check the trans fluid but it's a locking top that will get you to pass tech
I agree with Dartindanno I have the same thing ,( lower left in the picture ) last year my old ATI plug broke and I put the stock dipstick back in for week or so until my new one came and the tech inspector at my home track caught it . I keep the stock dipstick in the trailer so I can check the fluid level.

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