Replacing 3 speed with 4 speed

H2o · 10-12-06, 09:18 PM

I am looking to replace my three speed in my 74 fj40. I was wondering if someone could fill me in on what is involved. are there any extra parts needed? can i reuse my drive shafts?

I hear there is also some advantages of using the three speed transfer for the lower gearing.

thank..

Poser · 10-12-06, 09:38 PM

Tech links?

FAQ

Info in both.

Bad Coco · 10-13-06, 08:37 PM

I did this as well in my 71. As I remember it required a 2f bell housing, clutch, and flywheel. Was pretty darn straight foward. Being a pretty much a newbie myself, I may have left something out. Good luck

brian · 10-13-06, 08:49 PM

pretty sure either clutch will work. however you will need to use all the parts from which ever one you go with IE the flywheel, pressure plate and disc.

AJFJ40 · 10-13-06, 09:35 PM

I completed this conversion about a year ago. You will need the 2F bellhousing, the drive shafts from a 4 speed model(front is longer, back is shorter) a bearing and gear for the transfer case( 4 speed has different spline count and diameter). I got my gear and bearing from ironpigoffroad.com in Virginia. Used a new clutch, pressure plate and throw out bearing from 2F. Also replaced pilot bearing.