V1 [GUIDE] F35 to F23 (with LSD) Transmission Swap

[newbtrying]

I received the f23 slave cylinder and got it bolted in. Measured the air gap to be 0.5” which is too much. Ordered the 0.25” ZZP spacer.

Now I have a really dumb question: since I swapped an F35 slave to the F23 slave, do I need a different elbow? I’m not seeing how this elbow I have from the f35 (in pic) can attach to the F23 slave cylinder (also in pic).

 

[jirwin]

I can't say for sure since I've always been F23, but if you need the same setup as me you'll need this whole assembly just for the Y thing at the end

More Information for GM GENUINE 12582665

 

[newbtrying]

I can't say for sure since I've always been F23, but if you need the same setup as me you'll need this whole assembly just for the Y thing at the end

More Information for GM GENUINE 12582665

This? Specifically the elbow on the right?

might go dig through a junkyard tbh...

 

[mike_sno]

I received the f23 slave cylinder and got it bolted in. Measured the air gap to be 0.5” which is too much. Ordered the 0.25” ZZP spacer

Do you mind sharing how and what air gap you measured? I'm trying to get a F23 on a LNF and not sure about the clutch assembly.

 

[newbtrying]

Do you mind sharing how and what air gap you measured? I'm trying to get a F23 on a LNF and not sure about the clutch assembly.

2” on the clutch/flywheel side and 2.5” on the throw out bearing. 0.5” total. 0.25” post spacer install.
I do not have a stock flywheel, clutch, or pressure plate just FYI. I can’t remember their details though.

 

[Desert Sasqwatch]

Review the video from ZZP about measuring the TOB air gap.

ZZP Throw Out Bearing Spacer

Installs in-between the transmission bell-housing and the throw out bearing so it doesn't have to push out as far to do the same job. Includes 1/4" billet aluminum spacer and (3) replacement bolts.

zzperformance.com

 

[Robinjo]

Direct link to the ZZP video but you can also find it in the ZZP page from Das Sasquatch. I have a black spacer just laying around my house somewhere if someone ends up needing one.

 

[mike_sno]

Direct link to the ZZP video but you can also find it in the ZZP page from Das Sasquatch. I have a black spacer just laying around my house somewhere if someone ends up needing one.

Seems like there is a bell housing spacer. My engine came without one. Do I need that? Minute 1:54 in the video

 

[Rttoys]

I think so? I don’t have a turbo model, but remember others talking about it.

 

[comegetjoe]

As far as my understanding goes, its like a puzzle. If you can get the right air gap with it, cool. If you can get the right air gap without it, also cool. If you need it, you need it, if you dont, you dont.
Get to measuring.

 

[newbtrying]

As far as my understanding goes, its like a puzzle. If you can get the right air gap with it, cool. If you can get the right air gap without it, also cool. If you need it, you need it, if you dont, you dont.
Get to measuring.

Can confirm this is right. I got an email back from ZZP and they confirmed a 0.250” air gap can still be ran. They mentioned if I wanted, I could buy their 0.200” spacer and remove the bell housing spacer to be more within spec for air gap, but the lead engineer said he’d probably just run it as I have now if my car were his and he was me in the situation.

 

[Gtstorey]

I ended up at about the same dimension as you. No problems yet after 5 years.

 

[mike_sno]

I have measured the gap as 8.15mm target, according to the video, would be 3/16in = 4.76mm. I am 3.39mm off. 0.13in.

I was thinking of machining the ZZP spacer a bit thinner, but it looks like non of the sides is flat. What would be the best way moving forward?

 

[newbtrying]

I have measured the gap as 8.15mm target, according to the video, would be 3/16in = 4.76mm. I am 3.39mm off. 0.13in.

I was thinking of machining the ZZP spacer a bit thinner, but it looks like non of the sides is flat. What would be the best way moving forward?

my knowledge in this subject is in inches, so for my sake i'm going to rephrase what you said in inches.

Your current air gap is 0.321" while the target air gap is between 0.150" and 0.200". If you installed the 0.200" ZZP TOB Spacer, you'd be left with 0.121" air gap, which is slightly under spec. I'd bet it'd work, but it's just a hunch. If you were to buy a bell housing spacer, which measures about 0.120" (it sounds like you don't have one from your other post), you could pair this bell housing spacer with a 0.250" ZZP TOB Spacer and be at 0.191" air gap, which is within spec.

 

[mike_sno]

Correct, I don't have a bell housing spacer. I couldn't find it online either.

 

[newbtrying]

Correct, I don't have a bell housing spacer. I couldn't find it online either.

your next shot is a junkyard

 

[comegetjoe]

I have one here
Im just lazy and shipping going to be expensive.

 

[mike_sno]

I went a little nuts ( Surprise! ) and build a new fixture and turned myself another spacer to measure at the exact points where the TOB touches the clutch fingers. Measured again and came up to this combinations. I have my hands on a bell housing spacer and @Robinjo will sell me the TOB Spacer. I think with the combination of the 0.25in spacer and the bell housing spacer I am ok.

 

[mike_sno]

I need a little help here. I got my hands around a 0.2in and 0.25in spacer. I do have 2 slave cylinders. Today I tried to put the spacer behind the cylinder. How do I disassemble the slave cylinder to install the spacer? Do I have to press it out?

 

[newbtrying]

I outline how I addressed pulling the seal on my TOB here. I think I’ve heard of other people knocking them out with perfectly sized sockets from the clutch side, but I’ve not.