Using Earlier Clutch master for more throw/travel

[Pierps]

Hi All,

I have a small block chevy 350, a chevy bellhousing, and Advance Adapters ranger overdrive unit which also acts as an adapter to the stock toyota 4 speed. i'm using the OEM clutch master and slave for my 9/75 US-spec fj40.

I'm 75% through a restoration (ahem, "restomod" for the legalistic folks). I had the engine out at one point, and decided to replace the clutch. I have learned that I didn't do enough research and should've bought Downey's low profile clutch, since the toyota master/slave doesn't produce enough travel to totally engage the clutch.

I'm trying to find a solution that doesn't involve pulling the engine out and redoing the clutch. I'll do it if I have to, but would rather not.

I've read a bunch about using an earlier model clutch master, which has a 1" (or 13/16"?) bore, but keeping the current slave. Some people have reported success with this approach, but some have said that it causes the slave to puke out the push rod due to excessive travel. I've also seen people speculate that it might cause TOO MUCH travel.

The threads i've found are pretty vague and often don't involve people following up on whether things worked out for them. So I'm hoping you guys can share your experiences. If not, I guess I'll just buy a new clutch master, see what happens, and post it here.

 

[Pierps]

Continuing my research... I noticed that SOR sells an updated clutch master, slave, and lines specifically for chevy V8 conversions. See part number 330-918 on this page:

Land Cruiser Warn Locking Hubs

Warn Hubs for Land Cruisers, Warn Dash Stickers and Decals

www.sor.com

Does anybody have experience with this setup? It looks a whole lot like the '70-'75 clutch master. No idea which slave they're using.

 

[Pierps]

alright, well I got impatient and ordered the SOR kit. I'll report back.

 

[mtquivr]

You might also look into the slave cylinder mount. I initially used the AA one, but when I was under the cruiser bleeding it, you could see noticeable flex in the mount which I'm sure resulted in decreased throw. I bought the beefier one sold by BTB.

 

[Pierps]

Thanks @mtquivr ! Did you buy this one? Looks like they're sold out.

Slave Cylinder Bracket for Mounting FJ40 Slave Cylinder to General Motors NV4500 Transmission - BTB Products - Land Cruiser Restoration and Parts

Slave Cylinder Bracket for General Motors NV4500 Transmission. Mounts the original FJ40 Toyota Land Cruiser Slave Cylinder.

btbprod.com

 

[mtquivr]

I think mine was ver 1.0, it didn't have the mount for the spring.

 

[B y r o n]

Instead of using an early clutch master, look at the early brake master cylinder. When I installed my NV4500 with internal clutch slave/throwout bearing I used the early brake master cylinder because it had the same bolt pattern with higher volume. The extra volume provides for additional travel of the throwout bearing.

 

[Pierps]

Thanks @B y r o n . I already sprung for the SOR parts. I think it has the 13/16" bore- not as big as the early brake master (which I believe is 1"). If the SOR kit doesn't work, then I'll try the brake master. I got scared away from that because I believe it uses a different size fitting and I'm lazy and don't want to fiddle with bending and flaring hard lines if I can avoid it.

 

[franklin40]

Thanks @B y r o n . I already sprung for the SOR parts. I think it has the 13/16" bore- not as big as the early brake master (which I believe is 1"). If the SOR kit doesn't work, then I'll try the brake master. I got scared away from that because I believe it uses a different size fitting and I'm lazy and don't want to fiddle with bending and flaring hard lines if I can avoid it.

did this work for you in the end?

 

[jim land]

We need an update

 

[Pierps]

Poor form, not updating this! Yes, it worked perfectly. Super easy bolt-on thing. No problems so far, but my truck still isn't done so I have only put testing miles on it (meaning, only a few miles).

@franklin40

 

[hanzo111]

Bringing back old thread.

I have a 76 fj40 with a Downey conversion (previous owner) 350/orig 4 speed
i installed the LUK low profile clutch. What Master slave combo will give me a little more travel than the
original setup? I can shift up with no issue, downshifting grinds gears.

Thanks in advance

 

[pbgbottle]

Bringing back old thread.

I have a 76 fj40 with a Downey conversion (previous owner) 350/orig 4 speed
i installed the LUK low profile clutch. What Master slave combo will give me a little more travel than the
original setup? I can shift up with no issue, downshifting grinds gears.

Thanks in advance

Have you adjusted the clutch pedal also up top to the master double check your getting full stroke of the master also sometimes the pedal hits the floor before achieving full master travel. Especially if ya have floor mats. Also have you physically looked at the fork to throwout bearing and adjust the slave so the TO bearing is just about to touch the fingers take up all the slack or slop everywhere. It should work fine
I just use the 1978 master and slave combo but remove all the slop out of the slave and make sure the pedal is achieving full stroke master. Adjust the master pushrod and the slave pushrod to almost zero gap. And no resting your foot on the clutch pedal while your driving or you will kill your TO bearing if it is touching the fingers and spinning all day.

 

[hanzo111]

Have you adjusted the clutch pedal also up top to the master double check your getting full stroke of the master also sometimes the pedal hits the floor before achieving full master travel. Especially if ya have floor mats. Also have you physically looked at the fork to throwout bearing and adjust the slave so the TO bearing is just about to touch the fingers take up all the slack or slop everywhere. It should work fine
I just use the 1978 master and slave combo but remove all the slop out of the slave and make sure the pedal is achieving full stroke master. Adjust the master pushrod and the slave pushrod to almost zero gap. And no resting your foot on the clutch pedal while your driving or you will kill your TO bearing if it is touching the fingers and spinning all day.

Thanks for the advice!
I have done everything except adjust the pedal rod, will definitely do this today. I’ll double check the Bearing clearance with a scope as well.

Thanks

 

[pb4ugo]

I've been running the later model 40 slave and master for decades. When i 1st got my 75 I did have to fine tune the pedal and freeplay the adjust the rod. I adjusted the pedal freeplay by watching for the intial movement of the slaves piston while pressing the pedal a little by hand.

 

[pb4ugo]

I must add, my 1st setup was AA bellhousing to stk fj40 4 speed then to a stk gm sm420 b/h. The 75 runs a gm or AA b/h to NV4500.