1974 FJ40 Question

[suave107]

Been a lurker for some time now. Wealth of info on here and I appreciate the knowledge yall pass on. I own a 01' 100 & 74' FJ.....my question.

FJ was built in April of 74' and has a 4-speed. Original 1.5F blew a rod through the block and I'm trying to switch out to a 2F (87). Bought a Aisin clutch kit for the 2F thinking it would bolt up, but the flywheel & pressure plates are different and I've read I'll also need a clutch slave cylinder (throw out is much larger) to use the 2F stuff. Should I use the 1.5F stuff....clutch release, flywheel, & pressure plate or will that cause issues? I do have the 1.5F pilot & throw-out bearings in case.

Thanks

 

[pb4ugo]

I think the general rule is use either all the 3 speed clutch parts or use all the 4 speed stuff. Inter changing parts won't work. Personally id use the later clutch parts.

 

[Pighead]

FJ was built in April of 74' and has a 4-speed. but the flywheel & pressure plates are different

Yes. This is sometimes called a "Transition Year" and lots of things are different. My 12/'74 came with the 4-speed tranny but 3-speed (deep dish) flywheel, early (3 finger) pressure plate, clutch fork and pivot, slave and slave pushrod This led to almost endless hilarity as I rebuilt the engine the first time (before 'Mud).
You can use all the clutch parts from the '74 but you have to use them all. Can you use them with a later flywheel? I'd like to say probably yes but I do not know for sure. To go with the diaphragm style pressure plate you'll need a new throw-out bearing, it's holder and it's special clips, the later clutch fork and it's pivot and the slave pushrod. Your slave cylinder might be fine.
Also; please stop calling an FJ40 an FJ.

 

[igotta40]

I have a Feb 74 with factory 4 speed and 3 finger clutch. Slave cylinder on the driver side. I replaced the F with a 2F (Oct 75) and used the F flywheel, clutch, bell housing, everything. It all bolted right back on. That was in 1986, been there ever since.

 

[65swb45]

IF…you are not planning on wheeling a lot, and IF you are planning on keeping the truck for a long time, switch to the newer clutch. Parts for the older clutches are slowly drying up.

 

[Living in the Past]

To do the switch to the later diaphragm pressure plate need to changes all the clutch pieces including the flywheel. If your later 2F has the flywheel would be easier. 8/80 four speed bellhousings do not have threaded holes for motor mounts. If your not running a 8/80 plus four speed you will need the early bellhousing. Even if you have the later four speed the L brackets and crossmember are no longer cheap and easy to find. It would also require some mods to attach the crossmember L brackets to the frame. 74's bellhousing would be easier.