Checking band adjustment

[turbodarryl]

With the servo assembly installed, am I looking for .060 clearance between the retaining ring & servo , or do I have to compress the servo and springs to where they stop compressing then look for the .060 clearance?

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[TexasT]

Assemble it without the springs n seals and measure. When you are satisfied with the clearance then put the seals and springs in.
What band material are you using? Is it new or is this a new servo install on an existing trans? Which servo are you using?
Have you checked the drum for straightness and runout? Are you using a shift improver kit? What size n stall torque converter are you using?
Many factors to getting a good shift.


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[turbodarryl]

Yes a new build, alto clutches an band, ck servo, AC 9" converter., yes drum checked good.

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[TexasT]

http://gnttype.org/forums/showthread.php?t=9724&page=3

Check out post #29
I've heard bad things about the alto band but maybe they have that under control now. It was recommended I use a carbon band.

When you get the thing in be sure to air check it. You should feel drag turning the output( i used a yoke for leverage) then when air applied it is locked down. You can use the port shown in the post#29 or the exhaust port in the pan rail. This is why you should not use gasket maker stuff as the exhaust port could get obstructed. A good gasket should work if your pan rail is straight.

 

[turbodarryl]

ok i adjusted the servo exacty as stated, i had to grind the pin and i ended up with .060 clearance between the snap ring and band using my dial indicator, while building the trans i air checked the servo using the stock servo and all was good, now the valve body is on so i can't check at that port, Are you saying i can check the servo at the exhaust port at the pan rail at the servo location ?

 

[Steve V]

Toss the Alto band, call Lonnie or Dave get a carbon band and set it up with drag. The break it in wheels off the ground 25-30 shifts 2-3/3-2 and have at it.

 

[olds403]

What is meant by drag on the carbon band. If set up as the per the earlier posts using the .060 method there will be a gap/slop around the band to drum.

For those using this carbon band the pin must be a bit longer. I have the carbon band and it's set up the .060 method.

Just asking for the next build

 

[TexasT]

I am not a guru but I got a lot of advice from several. I was told that as I turn the output shaft I should feel the band drag. I turned the out put to get a feel before the servo was installed . Then put the servo in without the seals n springs. The servo went in and out several times as we ground down the pin. I used a Sonnax so a new pin was included in the kit. This got us to a little drag on the output and the output locked up when we added air to the valve body port after installing the seals n springs.
I am planning my next build and will use a ck servo unless I find a better deal along the way. I might even spring to get the drum surfaced and use a wide band. Time will tell. Lots of other things slated in the budget ahead of that, but I dream big.

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[olds403]

CK's servo is not that expensive and nice piece, back to the band. Are you looked at the drum and band while upside down on bench with pan off . Using your method the band would be tight around the drum. The .060 method will have slop with respect to band to drum.

 

[Steve V]

The alto band will burn up if set up with drag, the carbon band will not. Call Dave at turbobuick performance if you need a better explaination. Drum must be flat and wide band is a no no. Sonnax servo is my choice.

 

[turbodarryl]

My trans is now completely built, just have to put the pan on, since it will be mostly street driven ill leave the alto in for now, BUT I do have plans in the future for a HP upgrade witch will require more billet parts, carbon band an ect. ive already talked to Dave and he's been a great help, Thanks.

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[Steve V]

Dave is a super guy and easy to on the phone for tech help.

 

[olds403]

Back to carbon band. Mine is wider than stock. Are two sizes available ? Perhaps, I should just order Dave's and find out ?
Thanks again. This is a great forum

 

[TexasT]

Yes, two widths. Stock and I believe 2 3/8". I didn't have a way to surface the drum so I went srock width.

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[Steve V]

I suspect you have the carbonite band available from fast food trans parts houses. Dave and Lonnie have a stock with carbon band that they have made special for them only.

Now if I am of base hopefully they will chime in and get me straight

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[TexasT]

Could be. It was sold to me as carbon fiber but who knows.

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[clusolynn]

To make things a little easier you could get the 2004R Billet Adjustable servo from Lonnie at Extreme Automatics, GBody Parts or RJC Racing. It has the largest apply area available with a piston diameter of 2.995" and you just install it once, then adjust it from the outside of the transmission with just an Allen wrench and 1/2 open or boxed wrench. Too easy!

 

[Steve V]

To make things a little easier you could get the 2004R Billet Adjustable servo from Lonnie at Extreme Automatics, GBody Parts or RJC Racing. It has the largest apply area available with a piston diameter of 2.995" and you just install it once, then adjust it from the outside of the transmission with just an Allen wrench and 1/2 open or boxed wrench. Too easy!

Can not find it on any of those websites? Brian has a 700r4 listed.

 

[TT/Ameasap]

I just talked to Stagerite a month ago and they are making an adjustable servo right now....or its already available. I think he sells all his stuff through gbodyparts.com tho. Call Stagerite, super nice guy.

 

[Steve V]

I just talked to Stagerite a month ago and they are making an adjustable servo right now....or its already available. I think he sells all his stuff through gbodyparts.com tho. Call Stagerite, super nice guy.

Ive seen pics of it in the forsale section. I know that the sonnax and version of it is popular with most builders. Band adjustment is critcial as well as the non floating pin design. Just curious how this compares.

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