Topic: high pinion diffs

[mossyoak85yota]

how much extra clearance does the high pinion diff proviode are they worth the money?

[Rocksurfer]

Had a friend run a high pinion and it kept frying the bearings so any extra clearance I would gain would keep me in fear of failure all the time.

[mossyoak85yota [OP]]

i saw a thing that looks like a small fan called an oil slinger did he use that? or  does it not work

[daniresch]

Had a friend run a high pinion and it kept frying the bearings so any extra clearance I would gain would keep me in fear of failure all the time.

This sounds more like improper installation by your friend, wrong bearings maybe?

[HogCanyonHopper]

HP diffs are not recommended for running in the rear from what I've heard. If you're running one in the front, I don't see how you could fry bearings unless you're driving it in 4HIGH at high speeds.  Not totally sure on that, just my  I have a Marlin built HP in my front axle, but it has seen little to no wheeling at this point. 

[pumkin toy]

yes hp diffs are worth it for sure.  gets your driveline up out of harms way.  you will land on your leaf springs or links before hitting the driveshaft when you have a hp setup.  also if you are running leaf springs, it is nice to have a hp diff to keep your driveshaft angle from being so steep and wanting to pull apart when you flex the suspension.  As for bearings going bad, that is an issue with installation, there is no reason for that to happen unless he was running it in the rear axle.  hp diffs are no good in the rear!

[bryanrz]

From what I understand there are to sides to every ring gear. Known as the drive side and coat side a hp in the front lets the drive side( which is stronger) be the one you use going forward.  Using a hp in the rear would mean when going forward you would be using the coast side of the gear. Which is weaker

[BirdDog]

Here's a few pic's of mine. It measure just under 16 3/4 inches from ground to flange.

The other thing to consider is how much you will have to rotate your front axle for proper drive line angle. I'm not an expert here so I may be in over my head but I think the rotation of the front housing can effect steering and death wobble issues. Which I believe is why some resort to cutting and turning the bells or knuckles on their front ends ?

imho, yes the high pinion front diff has been worth the money. I personally have never had any problems with mine and I put on quit a few trail miles every summer. I did have Rocky at Marlins set mine up.

Pay the professionals to do it right the first time...

[mossyoak85yota [OP]]

thanks glad i checked before buying one for both ends. im just gonna get one for the front to be safe

[fordh8r]

Had a friend run a high pinion and it kept frying the bearings so any extra clearance I would gain would keep me in fear of failure all the time.

Any recollection as to which bearings failed specifically? (side or pinion bearings) The outer pinion bearing is dependent on having a special oil retainer ring that is installed behind the bearing race in the housing. If that's missing it will starve that outer pinion bearing for oil. Just curious. Carry on.

[Toyotahilux80]

I  highly recommend high pinion I've been running it for three seasons with no failure, so it's all on how you set it up!

[NorCalPR]

For those saying there are Oiling issues:

Fj80's run hp fronts, with drive flanges with no issues. So even on the highway they are spinning.

Hp in the rear is a no no. The oil will not get slung properly, and you run on the weak side

[TimberlineBryce]

What is the stock gear ratio for hp's?

[pumkin toy]

4.10 is the only one I have heard of

[zembalayan]

4.10 is the only one I have heard of

For what you'll will find over here in the U.S., pumpkin is right: 4.10s.  I have sold a couple of those and they were both 4.10s. 
Per several posts by Slee on mud, some of the foreign Cruisers came with OEM HP 4.56 and 4.88 reveres cut gears, and you can still order them from Slee for $700+, and that's just for the R & P alone.  Check out the link here:
http://forum.ih8mud.com/80-series-tech/1639-4-56-ring-pinion.html

I'd be going with the ratios and diffs Marlin Crawler is offereing.