PDA

View Full Version : Making the switch this spring to a 4 speed


bigcity25
11-10-2011, 01:08 PM
Wishing I had the cash like the rest of you cruisers to do what ever I want to my rig. But I don't, and my banker (wife) ropes me back to earth. But I have decided to upgrade my setup to a 4 speed. Love the 3 speed but want to make it a little more user friendly and drivable in the mountains. Now my 40 is my DD and I don't do alot of wheeling. It sounds like a 4speed tcase and transmission combo is better suited for me. I have acquired a 4 speed transmission and another 3 speed tcase with the correct spline gear to mate them up, 4 speed bell housing and flywheel. I know I still need drive shafts, slave cylinder, shims? and a bearing?. Is it gonna make my life easier to get a 4 speed t-case and remove all the 3 speed vacuum stuff? I have been talking with Ricardo about his experience and what he did. This is going to be a spring project so I have some time to invest in learning and research. What's you experiences and opinions?

Rzeppa
11-17-2011, 12:08 PM
Wishing I had the cash like the rest of you cruisers to do what ever I want to my rig. But I don't, and my banker (wife) ropes me back to earth. But I have decided to upgrade my setup to a 4 speed. Love the 3 speed but want to make it a little more user friendly and drivable in the mountains. Now my 40 is my DD and I don't do alot of wheeling. It sounds like a 4speed tcase and transmission combo is better suited for me. I have acquired a 4 speed transmission and another 3 speed tcase with the correct spline gear to mate them up, 4 speed bell housing and flywheel. I know I still need drive shafts, slave cylinder, shims? and a bearing?. Is it gonna make my life easier to get a 4 speed t-case and remove all the 3 speed vacuum stuff? I have been talking with Ricardo about his experience and what he did. This is going to be a spring project so I have some time to invest in learning and research. What's you experiences and opinions?

I learned a lot that I had never read about on any forums when I swapped an H42 4 speed into my 71. I retained the 3 speed clutch and bellhousing because I like the heavier flywheel, and I didn't need to change the routing of the clutch lines. The slaves are the same, the only reason you might need a new slave is if there is something wrong with your old one. I kept my vacuum actuated front drive in the t-case - I have always liked it. I don't know what year yours is, whether you have vacuum or linkage. There are no shims needed for the swap. I had to fabricate a couple of spacers for the t-case - one for where the 3 speed PTO gear went and one for the back of the tranny output shaft. You will also need 4 speed bolts to hold the t-case onto the tranny. I have a lot of pictures and a write on mine somewhere here, I did mine in the summer of 2006.

bigcity25
11-20-2011, 09:09 PM
Thanks for the help, when you made a spacer for the output shaft inside the tcase, did you use pipe? Something that was snug so it doesn't shake a spin? As a side note, I am still gonna need to meet up with you for my timing issue. Enjoy the holiday

Rzeppa
11-23-2011, 12:48 PM
Thanks for the help, when you made a spacer for the output shaft inside the tcase, did you use pipe? Something that was snug so it doesn't shake a spin? As a side note, I am still gonna need to meet up with you for my timing issue. Enjoy the holiday

Yes, I used some schedule 40 steel pipe I got at Home Depot. I measured the thickness of the PTO gear and made the pipe within about +/-0.010" same. The tricky part was making the ends really really flat without a lathe. I just took my time with a bench grinder and it came out well. No wobbles or vibrations. Let me see if I can find my article....

Hah! It took quite a bit of searching but here it is:

http://www.risingsun4x4club.org/forum2/showthread.php?t=1629&highlight=engine+freshen