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servo apply pin

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boostmaster

Active Member
Joined
Aug 20, 2001
Messages
1,339
Can some one explain to me the function of the servo apply pin and what effect lenthening or shortening it will have on shift quality. I have 2 bq transmissions and one has the original lower spring on it and is stock length. The other has been ground down on the tip and has a thinner than stock longer spring on the end.
Any help will be appreciated.


Thanks, Boostmaster
 
not exactly what you're looking for, but ive installed an 87 servo in my bq tranny and the shifts are quite a bit mroe noticable..you might just want to do that.. or hell dont even worry about that, and get a super servo ;p
 
In the old days, automatic transmissions had adjustable bands. Typically the band anchor pin was threaded into the case which allowed for adjustment of the band-to-drum clearance.

Newer transmissions have the same need for proper adjustment but the procedure isn't the same. Instead of a threaded rod, you are faced with selective length apply pins. If the band is too loose, you'll have lazy band apply and possible pre-mature release during an upshift resulting in a flare-up. Too tight and, well, you'll have binding.
 
I swapted pins from a ground down one to a full length pin. Could that be the reason for my violent upshifts and even more violent downshifts on deccelleration. I'm more concerned about the downshifts though, it's so bad it almost feels as if it will stall the car when coming to a stop. Kind of a clunk, bbbbbbbam downshift.
 
Does your car kind of push you on a downshift ? A 2004r will stay locked up in every gaer except for 1st and rev., unless the tcc valve has the spring on the wrong side, which will kill it dead when put in gear. Sounds like your tcc is staying locked up and when it downshifts to 1st. it is normal again.
 
the bq servo is smaller than the brf therefor the brf will shift firmer and hold the band with more force .different length pins are used to correct specifications because of deviations inparts sizes and accumulated wear .the manufacturing tolerances on the band,drum and case or servo can allow the band to malfunction if severely off .www.ckperformance.com
 
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