74 F engine/4 speed

[mxfj40]

I just purchased a 74 F engine off ebay to drop into my 71 FJ40. The po claimed that the motor only had 5,000 miles on it since new. It was from a FJ55 so I am assuming it will drop right into my 40. After pulling the head I think he was right--the motor looks like brand new--no carbon ledge and std. bore and all bolt heads look untouched. I have a few questions that you might be able to help with. Did all 1974 F engines come with 4 speed trans? The reason I am asking is because I am thinking about going to a 4 speed. The engine has a bellhousing and flywheel but I'm not sure if its from a 4 speed. If it is from a 4 speed what else will I need to purchase besides the trans and the transition gear. Should I go to the diapraghm clutch or 3 finger? Do I junk my flywheel and bellhousing and use the 4 speed? (if thats what i have) Will the clutch master/slave from my 3 speed work with the 4 speed? I think I will do a valve job? The po said something about putting in hardened valve seats--Is that a good idea? Thanks for any help in advance.

 

[Poser]

Thread is worthless without pics....

Since only you can see what you have...


I have parted out a Jan 74 40 series that had a three-speed transmission in it, but had the larger u-joints, read 4spd style, but were three-speed lenght.

Transition gear for the transfer case will be needed, along with the mounting bolts that are longer for mating the tcase to the four speed trans. You will need different driveshafts, as the 4spd trans is longer..


Diaphram clutch or finger, really does not make a diff, so long as you use all the correct clutch parts together. master and slave will work with three or four speed...

I would have the head checked out, hardened valve seats are a good idea


Good luck!


-Steve

 

[Wolfman]

i have a four speed sitting in my garage for ya

 

[Toyo FJ40]

My 74 came with a came with a 4 speed and the frame had the 4 speed cross member behind the tranny (Offset hump over driveshaft instead of even hump all the way across) I replaced my frame with a 72 and had to swap out the cross member, the engine and trans fits but there's only a 1/2 inch between the emergency brake drum and the cross member.

 

[CruisinGA]

but there's only a 1/2 inch between the emergency brake drum and the cross member.

Makes t-case, speedo gear and parking brake work a MAJOR PITA. David and I had a simple 30 min job expand into a 2 day one because of the same setup on a 350 swapped truck.

Something worth trying to resolve.

 

[mxfj40]

Thanks for the help. I will try to post pictures if I can figure out how. I cant even figure out how to get a picture by my login name.

Wolfman==How much for the 4 speed? What condition is it in?

 

[Toyo FJ40]

Yeah That's what I thought after I dropped it the engine and trans. I saw how close it was and figured I'd have to drop my trans mounts to pull my tranny so I chopped the crossmember from my old frame and welded it in to the new frame and I was back to good.

 

[snailwagon]

3spd and 4spd bellhousings use different bolt threads where the tranny/bellhousing go together. Course threads for the 3spd, fine threads for the 4spd. The flywheels are also very different. The 3spd flywheel is massive, while the 4spd is medium sized (maybe 3" vs. 2" thick. Also, the 3spd flywheel has a large step all the way around the perimeter, while the 4spd. has a very small step down.

 

[Scott R]

I'm glad I read this, I have a 4 speed tranny that has a converted output shaft to mate to a three speed transfer case, no gear needed. Now I need to go and get longer bolts before Saturday, thanks for the info!