flipping rear third

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dacicci

dacicci

10 Year 15 Year 20 Year
Joined
May 9, 2005
Threads
58
Messages
449
Location
CINTI,OH
Website
www.pipsquack4wheelers.com
thoughts about flipping rear third member. trail rig only never goes over 25mph. is the pattern on bolts even and has anyone ever done it. i know i will have to grind for the ring gear on other side of houseing. and i will be running on the wrong side of the gear no one makes a reverse gear for this third member. I have to buy a new ring and pinion for my cruiser and will be running yukon 4:56 so tell me what u think.
 
yep, it would spin the tires backwards..

doesn't work..
 
And don't be too embarrassed for asking. I thought it was a great idea when I first heard about it on the LCML...



Date: Mon, 22 Dec 1997 13:21:54 -0800

Kahler, Charlie wrote:

> I am thinking of removing and flipping over my front 3rd member on my
> '74 FJ40. I figure it would help my driveline angle problem by raising
> the pinion about 4". My question(s) is; Aren't the gears cut to run
> primarily in one direction? If I flip it over, the pinion would have to
> spin the opposite direction to go forward. This is bad, right? If I take
> the 3rd member out of a REAR axle assy, and flip it over, it would be
> spinning the same direction as if it were in the rear. Problem solved
> !?!?! OK, now the next problem, if I flip the 3rd member over, would the
> pinion bearing assy get enough oil to it? BTW: I rarely go over 25mph
> in 4wd.
>
> Has anyone done, or attempted to do this, or am I overlooking something
> obvious? (besides the oil)
>

The front and rear third member are the same on most Land Cruisers (don't
know about the 80's) and clockwise is still clockwise, even when upside down
so I wouldn't worry about that. Oiling is going to be a major problem and if
you can solve it this might be a real trick way to improve drive line angles
and get that pinion off the rocks. I'm sure someone on the list will tell us
why it can't be done or it would have been done by now. If your housing is
similar to my 60 there is a slot cut on the top and bottom to allow the rig
gear to fit in and you will have to cut another set on the other side. If
this is all the modification you have to do other than the oiling please be
sure to post your results.

Cheers

Bruce
 
mookie said:
sucks that no one makes a pinion guard for LC diffs either...
Click to expand...
You have problems with this??

It actually could be done, but you would have to spin the motor backwards as well. Nothing all that tough about that. A new cam would be the hard thing...
 
just put your engine in the back o the car, then flip the centes. by putting the enginein th back, it will be spinning the worng way, by flipping your 3rd it will also be spinning the other way, they will cancel each other out.
 
point the pinion up at the T-case, install a CV.. I Drag my Diffs and Skid Plate all the time, but have yet to run into my driveshaft with my setup!

attachment.php
 
i got some buddy's who built rear engine one seaters and they flipped the whole housing upside down work great but they are pretty light. i have seen guys build their own pinon guards. my big thing is when i climb like a three foot shelf i hit my rear shaft and it held me up on mason jar in harlan ky, it would be nice to raise the drive shaft:beer:
 
Isotel said:
point the pinion up at the T-case, install a CV.. I Drag my Diffs and Skid Plate all the time, but have yet to run into my driveshaft with my setup!

attachment.php
Click to expand...

Correct. 95% of driveline issues can resolved with running a DC joint (double cardigan) at the top of the drive shaft be it front or rear. The idea of flipping the third sounds attractive but its really not nessecary is most of the time. If you search pirate, there is a thread on exactly how to clearance the DC joint for even more aggresive angles.

Good luck
 
zuluzeugma said:
Correct. 95% of driveline issues can resolved with running a DC joint (double cardigan) at the top of the drive shaft be it front or rear. The idea of flipping the third sounds attractive but its really not nessecary is most of the time. If you search pirate, there is a thread on exactly how to clearance the DC joint for even more aggresive angles.

Good luck
Click to expand...

A cardigan is a Sweater...

:hhmm:
 
zuluzeugma said:
Correct. 95% of driveline issues can resolved with running a DC joint (double cardigan) at the top of the drive shaft be it front or rear. The idea of flipping the third sounds attractive but its really not nessecary is most of the time. If you search pirate, there is a thread on exactly how to clearance the DC joint for even more aggresive angles.

Good luck
Click to expand...

i don't think he's worried about driveshaft angle issues, he's trying to get his whole pinion and driveshaft up way higher for better clearance in the rocks
 
mookie said:
i don't think he's worried about driveshaft angle issues, he's trying to get his whole pinion and driveshaft up way higher for better clearance in the rocks
Click to expand...

Yeah, I get that. The point is with a single U-Joint on top the pinion has to be in a parrell plane with the output of the t-case. When you run a DC, you can clock the whole axle housing up 20* and it gets the pinion out of the way of A LOT. I wished I had set up my SOA that way from the git-go but was poor when I did it. I'm going back and adding it now.
 
zuluzeugma said:
Yeah, I get that. The point is with a single U-Joint on top the pinion has to be in a parrell plane with the output of the t-case. When you run a DC, you can clock the whole axle housing up 20* and it gets the pinion out of the way of A LOT. I wished I had set up my SOA that way from the git-go but was poor when I did it. I'm going back and adding it now.
Click to expand...

well surely to God he's already done that....
 
Reverse gear has NOTHING to do with flipping a diff over. Reverse is "reverse" cut, which locates the pinion above axle centerline and the coast/drive side of the teeth the opposite direction, it still turns the same way. A reverse cut gear is used in a specific housing that the pinion is situated above centerline, but still on the same side as a std (low pinion diff). It does not make it so you can flip your diff over. Almost all vehicles ever made would place the ring gear on the left side of the pinion (if facing an open diff cover). if you flip a diff over the ring gear is on the rh side and when power is applied it will go the opposite direction. The only exception I can think of is Mercedes Gwagon wich uses the same a flipped diff center in the front, but this is because the front driveshaft turns opposite direction of a standard vehicle.


dacicci said:
too bad no one makes a reverse gear for 9.5" third that sucks be nice to get driveshaft above rear bars
Click to expand...
 
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