Lenco drive clutch question

I took my Lenco Drive apart to change Low gear, it currently has a 1.75 low and I want to change it to a 1.90. I understand how all of the other sections of the trans work but I do not see the Sun and other gears for low in the reverser. The Lenco site show CS1 and CS2 info. But mine looks like a CS1 case with CS2 guts? Are the exploded views on the Lenco site not right or I missing something? Also I checked the clutch packs and the one in high gear the clutches are brown or dark green and are only .050 the Lenco site says to replace them at .052. and the steels in this clutch pack are bowed not flat you can make them pop and stay in a given direction the ones in the other packs are flat and not wavy/bowed.
I bought this trans from Terry Mc Millan. I have not had a problem with it. I have not been able to contact him lately. I know he is working on his Top Fuel gig now. So any of you other savvy guys help would be appreciated


Todd Martin
Outlaw Blown63Vette

 

Lencodrive

This will probably sound like a commercial,but Larry Snyder knows everything
there is to know about a Lencodrive.
Snyder Motorsports 219 987 2921

 

Mike,
I think you are right. Since this post Matt a Lenoc and I have spoken and they are going to get me strighten out.

The funny thing is my RacePack only showed 8% to 10% slipage in the converter on the big end. So maybe now I will not need to send the converter in to tighten it up.

If I have any other issues I will give Snyder a call also.

Thanks For the help guy's.

Todd Martin
Blownvette

 

I ran a Bruno/Lenco CS2 setup and you have to keep up with tower pressure if you are manually shifting. ESPECIALLY after installing new clutches. If my memory is correct I think you want around .090 clearance on the clutch pack and to be honest I never concerned myself with how thick the clutches were as long as the pack clearance was good.

 

I am air shifting the trans. The air gap on the pack is .110.

I am going to just replace the steels and put a new pack in it just to be safe.

Thanks
Todd

 

Each clutch pack should contain (9) disks and (11) steels. You want .010 clearance per clutch disk.
I don't know anything about the Lenco Drive style of trans. If you are air shifting the trans there should be shims behind the roller plate to adjust shift pressure. On a CS-1 style trans you want anywhere between 30 & 45lbs of shift pressure using a manual shift tower and a fish scale to check pressure. You add or subtract shims to obtain the desired shift pressure.

Hope this helps
Bob

 

Sorry Mike,
We posted the same thing at the same time.

Another trick to make checking the clearance easier is to take the clutch pack out install the snap ring, hold the snap ring down with light pressure & measure from the top of the clutch drum to the snap ring, add the snap ring thickness to the other dimension and record in your log book or engrave it on the side of the clutch drum.
The next time you want to check pack clearance remove the pressure plate and wave washer re-install the pressure plate, measure from the top of the clutch drum to the pressure plate, subtract the previously recorded measurement and you have your pack clearance.
Make sure you are holding up on the clutch drum and pushing down on the pressure plate when taking your measurement.

Hope this helps.
Bob Kraemer

 

Ok, I now have more questions Both of my packs only had 7 fibers and 9 steels. Whats up with that? I have never had a problem with shifiting. I will check the shift psi like you guys said too. Thanks. I was told not to run less than 500 psi in the bottle and the shift psi should be 250psi min.

It also had a crazy set of gears in one section it had a 80 ring 37 planetary 22 sun. Matt is helping me out with also.

does anyone have a program for trans ratio rpm drop between gear changes.

I know you can figure the% but is that close enough.

 

That is the minimum pressure required in the air bottle and pressure regulator setting to operate the air servos which is different from the internal shift pressure settings.
In the section you are talking about the ratio is 1.4625
A Lenco drive style of trans may have a different quanity of steels & clutch disks than a CS-1 style of trans.

Take Care
Bob Kraemer

 

There is no shims to change in that tran. Take out the oil plug, there should be a (dot) a 12 o'clock. That is how you set the tower. Trun the tower to the right to one o'clock then trun it left to 11 o'clock then back to 12 o'clock lock it down. Also that tran take 250 psi to shift. check the (psi) if you are bruning up the clutch pack.

 

I am not burning up pack's I just checked them to see if they were worn, and they were. So I am going to replace them.

Ok KJC said not to set the pull PSi on an air shifted Lenco Drive and Mike you say to set it as a manual trans and then install the air pods.

From what I can tell if you do not have the hyme end set right then when it shifts it will not roll the shfting plate around far enought and this will cause you to burn the pack or not get enought PSI on the pack. So now what? Set it like a manual or like KJC said?

 

There is no shims or forks in that tran. The tran with shims and forks are in the old trans/ funnycar trans. In the old trans you must set the tower between 35/45 psi and it take shims to do that. In your trans make sure the pack clearance is right. Now you can set the tower . you do not have to set the tower ever time you make a grear change.

 

Lencodrives is a CS-2 transmission. Changing gears and setting it up is the same for the CS-2 and the Lencodrive. The Lencodrives come with three different shafts, a Ford, a GM, and a 1 1/4. The 1 1/4 is the best and used in Top Alcohol and Pro Mod.
The CS-2 is much easier to work on than the CS-1. Also, talk to Scott at Lenco.

Good Luck
Paul Weiss

 

You might want to check out their web site for info . www.lencoracing.com and look in the technical section .