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Well... how many of you have had this? I got the SM420 and 3 speed case mated now, but the yoke flange is way too big to clear the reverse hump on the tranny. I figured I would have some grinding since I didn't get a clocked plate adapter, but it appears that even if I gind the snot out of the flange it will still be too big. Did they use a larger flange in 73?
Any suggestions?
Temple
73 fj40 F SM420
currently 2wd <IMG SRC="smilies/eek.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">
 

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All you need to do is score a slip yoke from an earlier Cruiser (pre-4 speed). The splines will line up fine with your old driveshaft and then you put the slip yoke on the Transfer Case end.

Most I have seen fit without cutting the shaft, however the last one i assisted with needed 1 inch cut off the length of the shaft to work.

Luck!
 

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Was gonna post this when my parts get in, but since the topics up - I want to run my 4-speed t-case with the SM420 using the 3-speed gears. I'm thinking that it'll clear the reverse gear hump if I use the 3-speed flange and upper shaft, just like on the 3-speed case. Same potential for grinding, but otherwise can't see why it won't work.

Any comments. <IMG SRC="smilies/biggrin.gif" border="0">
 

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on this subject. Is there anyone who has used an early mini truck cv joint here. after my brothers spring over we will probably need a cv joint at the t-case but I don't think I could get one to fit. I have the wardens plate thats clocked 10 degrees.

TIA
 

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you'll need to not only grind the tcase flange but also the 420 reverse hump too. you don't need alot of clearance. i've got less than 1/4 inch clearance and its held up well. grind the 420 with some care. some folks have ground right through. the early flange helps some as noted previously.
 

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Discussion Starter #6
Nolen and Ruby....I dug up some early slip yokes.. and I did have a little grinding, but after a few hours in the garage I have it all working now. I have heard something that the earlier p/u slip yokes had the same splines...etc, but I haven't tried it. I actually got my plate from SpaceGhost aka Mike Smythe... and it was well worth it. If anyone is looking into getting one of these from him...e-mail me and I will give you the info.
Thanks for the info and replies..
Cruise On!
Temple <IMG SRC="smilies/smokin.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">
 

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Hi Temple,
Does this mean you got the clearance from the flanges only? I know I'm not nuts, but an awful lot of people keep suggesting that you have to grind the tranny. I simply turned the 3spd flanges down to 3.8" and had ample clearance. Maybe it's possible to use the 4spd (larger) flanges and driveshaft if you gring on both? Are all the cases (tcase and sm420) the same?

Glad you're good top go, keep me posted on the linkage.
Mike "SpaceGhost" Smythe
 

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Originally posted by Bill C.:
<STRONG>I want to run my 4-speed t-case with the SM420 using the 3-speed gears. I'm thinking that it'll clear the reverse gear hump if I use the 3-speed flange and upper shaft, just like on the 3-speed case. Same potential for grinding, but otherwise can't see why it won't work.

Any comments. <IMG SRC="smilies/biggrin.gif" border="0"></STRONG>
I had a 3spd and 4spd case on the floor at the same time when I installed mine, sure looked like it would fit the same. I should have mocked the 4spd case (without input gear) up while I had the chance!

Go for it!
Mike "SpaceGhost" Smythe
 

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I know my 4 speed yokes were huge compared to the early 3 speed ones that I used for my conversion. I had to grind remove some material from the drive shaft and t-case yokes and then I took a grinder to the side of my SM420's reverse hump.......

I did punch a hole in the side of my SM420.....woops! Oh well, at lease I know JB Weld works to fill holes the size of your finger on a SM420. It has held up for over 4 years now (I think).
 

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The main reason that people have to grind the reverse hump on the 420 is because their adapter plate does not clock the tcase. If it clocks the tcase then you should not have a problem....
 
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