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Old March 24th, 2008, 09:28 AM   #1
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Default 4cyl/6cyl diff differences

I was just in the axle tech section and saw a post that said 4cyl gears can be made to fit on a 6cyl carrier. I pulled diff from my 4runner and the carrier was chewed up a little. Lost some teeth off the pinion gear on the way to Sno-Blind. I was digging thru my pile of parts and found what I think is a 6cyl posi diff. There is some problem at the pinion bearing area I think crush sleeve not sure. Unfortunately I just ordered a 4.56 gear set for a 4cyl from the R & P shop and picked up a master install kit 4 a cyl from DTS all with Sno-Blind prizes (thanks Elaine). How hard is it to install the 4cyl gears on a 6cyl carrier? Do I need to take the install kit back and get one for a 6cyl?
I have another 6 cyl 4.56 posi diff for the front. I stuffed a 4.37 diff from an 80 p'up in it yesterday to get it back on the road and have the matching one for the front but they are both open. I am looking to build something I can drive anywhere and wheel mild trails. I already have 3 trucks with lockers and want something a little more street friendly. At what tire size do I have to start worrying about breaking birfields? Motor is stock 22re I am thinking of running 32 or 33 if it will turn 33's.
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Old March 24th, 2008, 10:37 AM   #2
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33's will break birfs in the right situation. Just depends on how/where you wheel.

The v6 gears have a higher pinion head. I am sure you can use 4 banger gears in a v-6 housing, but you'll have to do some more searching on that one. I believe the 4cylinder gears need a pinion spacer.
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Old March 24th, 2008, 11:31 AM   #3
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Monkeyevil is correct. A 6Cyl diff will use 4cyl R&P but requires a bunch more spacing in order for the reload to be set correctly. The guy that set mine up must have called me 10 times asking if I had the right parts. Eventually I sent him to Randy's R&P directly to ask the questions. It turned out to be a bunch of shims that had to be added, and they did not ship the gear set with enough. :miff:
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Old March 24th, 2008, 12:00 PM   #4
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Here is what you need:
http://www.pirate4x4.com/forum/showt...23#post1478223



http://www.pirate4x4.com/forum/showt...=4cyl+gears+v6
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Old April 4th, 2008, 08:25 PM   #5
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I've got a set of 83 axles in my yj with a f.i. 350 with 35 x 14.50 boggers on an open diff. 4 years now. I haven't broken the birf's yet. I have a spair set, and I've been waiting for the day.....
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Old April 4th, 2008, 09:05 PM   #6
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Quote:
Originally Posted by jeepinboy70 View Post
I've got a set of 83 axles in my yj with a f.i. 350 with 35 x 14.50 boggers on an open diff. 4 years now. I haven't broken the birf's yet. I have a spair set, and I've been waiting for the day.....
Aww, you can't be trying, then.
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Old April 9th, 2008, 06:59 PM   #7
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I easily snap d44 shafts with a 351w and 35" mud ta's in my Bronco with a True Trac. Picked up the 6 cyl install kit today need to catch the installer before he takes off to the U.P.
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