A friend is giving me his 4.11 R&P out of his late model FJ-40. I plan on trying to install them in my 86 Fj-60. Anything I need to know before I get started???? ???
FJ-40 4.11 gears into an FJ-60? (1 Viewer)
- Thread starter troyintahoe
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When you say "late model" which year?
Driveline flanges may be an issue...
Driveline flanges may be an issue...
- Thread starter
- #3
Good question! I think it's a 78 but I'll have to check.
if swaping the R&P(not the whole 3rd) I don't think it matters what year the gears are......or am I forgeting something?
I used 80 series 4:11's in my 86 fj60.....no issues, I think we just used the pinion flange from the 60.
I would prolly get new bearings for the diff. and if your paying to have someone set them up.....you can add a locker for not much more(if any) then the cost of the locker........
John H
I used 80 series 4:11's in my 86 fj60.....no issues, I think we just used the pinion flange from the 60.
I would prolly get new bearings for the diff. and if your paying to have someone set them up.....you can add a locker for not much more(if any) then the cost of the locker........
John H
- Thread starter
- #5
It's 78 body on a 71 frme and gear. I guess the flanges won't work. Can I weld on my flanges or do I need to do a Driveline swap to minitruck???
You will have to change the companion flanges from your current diffs, to the 4:11's that you are intending on installing. You say that these 4:11 gear sets are out of a "late model". In therory, you should not have a problem swapping the flanges, but, I have seen proclaimed " late modle" diffs/gear sets that did not have the "fine spline" pinions in them.
In the event that you end up having the "coarse spline"(which, until you remove the flange, you can not tell) 4:11 diffs, you can get a companion flange that will work for your bolt pattern on your '86, from Downey, or perhaps Randys ring and pinion.
Count the teeth and do the math before going through all the work of setting these up, and chaging them over. I know people who have not, and spent a lot of time and effort to install 3:73's back into thier trucks!
Good luck!
-Steve
In the event that you end up having the "coarse spline"(which, until you remove the flange, you can not tell) 4:11 diffs, you can get a companion flange that will work for your bolt pattern on your '86, from Downey, or perhaps Randys ring and pinion.
Count the teeth and do the math before going through all the work of setting these up, and chaging them over. I know people who have not, and spent a lot of time and effort to install 3:73's back into thier trucks!
Good luck!
-Steve
you've got a couple options...the 71 axles with the 4.11 gears will have coarse spline pinions, and your existing d-shafts won't bolt up since the pattern won't match.
https://forum.ih8mud.com/index.php?board=1;action=display;threadid=7494 might answer your questions...
https://forum.ih8mud.com/index.php?board=1;action=display;threadid=7494 might answer your questions...
kling-on
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re-drill em thats what i'm gona do, most of the flanges i've seen that are multi bolt are fine splines :-\ now if you can get some fj62 drop outs BLING BLING 4.10 and fine spline correct flanges 
kind hoppen to swap my 4 drop outs for a pair of those 
kind hoppen to swap my 4 drop outs for a pair of those 
theferg
SILVER Star
You won't be able to re-drill the companion flange on the 40 diffs--it's square-ish and the holes are right at the four corners. I just put a '76 FJ40 diff into the rear of my 60. Can you say pain in the ass? I had to buy an after-market companion flange that was round with coarse splines. It was drilled for the early bolt pattern. Took it to a machine shop and they rotated it 1/8 turn (so the new holes were pretty much in between the old holes) and redrilled. Works fine except I never did get damn load on the pinion adjusted correctly yet. Vibrates like a mo-fo. But I don't care, my full-float rear end will be here at the end of the week and I'll be droppin' my 80 series e-locker diff in there. FWIW, I'll have that flange for sale when it's all done and under (which will be atleast two weeks).
-Ferg-
-Ferg-
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[quote author=kling-on link=board=1;threadid=7989;start=msg67751#msg67751 date=1069764425]
re-drill em thats what i'm gona do, most of the flanges i've seen that are multi bolt are fine splines :-\ now if you can get some fj62 drop outs BLING BLING 4.10 and fine spline correct flanges kind hoppen to swap my 4 drop outs for a pair of those
[/quote]
That's what I did. Couldn't be easier!
re-drill em thats what i'm gona do, most of the flanges i've seen that are multi bolt are fine splines :-\ now if you can get some fj62 drop outs BLING BLING 4.10 and fine spline correct flanges
kind hoppen to swap my 4 drop outs for a pair of those [/quote]
That's what I did. Couldn't be easier!
theferg
SILVER Star
[quote author=Poser link=board=1;threadid=7989;start=msg67508#msg67508 date=1069720856]
Count the teeth and do the math before going through all the work of setting these up, and chaging them over. I know people who have not, and spent a lot of time and effort to install 3:73's back into thier truck.[/quote]
That's a damn good idea. But FYI, the FJ40 4.11s have 37 ring gear teeth and 9 pinion gear teeth and the FJ60 3.70s have 37 ring gear teeth and 10 pinion gear teeth. So you gotta count both of them. And count 'em twice or three times and let somebody else try counting once or twice to be sure--and make sure you haven't had too many
or you could waste a lot of time--right Mixmaster!? :
-Ferg-
Count the teeth and do the math before going through all the work of setting these up, and chaging them over. I know people who have not, and spent a lot of time and effort to install 3:73's back into thier truck.[/quote]
That's a damn good idea. But FYI, the FJ40 4.11s have 37 ring gear teeth and 9 pinion gear teeth and the FJ60 3.70s have 37 ring gear teeth and 10 pinion gear teeth. So you gotta count both of them. And count 'em twice or three times and let somebody else try counting once or twice to be sure--and make sure you haven't had too many
or you could waste a lot of time--right Mixmaster!? : -Ferg-
all these are good suggestions but TOTAL wastes of time.
All you need, and I know because my 4.11's in my 82 fj 60 are from a 71 Fj40, are the driveshaft ends. that's it. pop your driveshafts off, pull the ends off, put the 40 ends (that match the diffs) on, and turn the shafts around. Presto, chango, set to go. No drilling, dissassembly, etc, nada. you can take the hard way, but why?
Sorry to those who offered good suggestions, but this is waaay easier.
Blumel
All you need, and I know because my 4.11's in my 82 fj 60 are from a 71 Fj40, are the driveshaft ends. that's it. pop your driveshafts off, pull the ends off, put the 40 ends (that match the diffs) on, and turn the shafts around. Presto, chango, set to go. No drilling, dissassembly, etc, nada. you can take the hard way, but why?
Sorry to those who offered good suggestions, but this is waaay easier.
Blumel
- Thread starter
- #13
Thanks, now all I need are driveshaft ends. My friend wont part with his
[quote author=bernefj60
Sorry to those who offered good suggestions, but this is waaay easier.
Blumel
As long as you have the parts, do not mind running the smaller u-joint, and the shafts line up in phaze. Great idea. I am sure that it has worked for many and not just you.
Sorry to those who offered good suggestions, but this is waaay easier.
Blumel
As long as you have the parts, do not mind running the smaller u-joint, and the shafts line up in phaze. Great idea. I am sure that it has worked for many and not just you.
- Thread starter
- #15
Pulling third member
Pulling my third member and swapping the ring and pinnion only. I'll repost after I give it a try and let you know how it went. Troy
Pulling my third member and swapping the ring and pinnion only. I'll repost after I give it a try and let you know how it went. Troy
sorry didn't see that you were just swapping the R&P, they should swap right in, if you know a guy that sets gears.
As for runnign the smaller u-joint, they're still beefy, Mine have stood up to my abuse for years.
Rob
As for runnign the smaller u-joint, they're still beefy, Mine have stood up to my abuse for years.
Rob
kling-on
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[quote author=bernefj60 link=board=1;threadid=7989;start=msg67976#msg67976 date=1069794812]
all these are good suggestions but TOTAL wastes of time.
All you need, and I know because my 4.11's in my 82 fj 60 are from a 71 Fj40, are the driveshaft ends. that's it. pop your driveshafts off, pull the ends off, put the 40 ends (that match the diffs) on, and turn the shafts around. Presto, chango, set to go. No drilling, dissassembly, etc, nada. you can take the hard way, but why?
Sorry to those who offered good suggestions, but this is waaay easier.
Blumel
[/quote]
Mmmmmmmmmmmm will have to get those too
all these are good suggestions but TOTAL wastes of time.
All you need, and I know because my 4.11's in my 82 fj 60 are from a 71 Fj40, are the driveshaft ends. that's it. pop your driveshafts off, pull the ends off, put the 40 ends (that match the diffs) on, and turn the shafts around. Presto, chango, set to go. No drilling, dissassembly, etc, nada. you can take the hard way, but why?
Sorry to those who offered good suggestions, but this is waaay easier.
Blumel
[/quote]
Mmmmmmmmmmmm will have to get those too
