Seals around the axles - where best to buy?

[Ronmar]

This is my rear. Front looks the same. View attachment 927421

that is a pic of a low pinion. the high pinion is at the top of the pumpkin with a almost horizontal driveshaft angle.

another strike against us is that the rear DS is right at the max length(61") for the type 16 driveshaft, so maximum mass and maximum longitudinal vibration forces at high RPM.

 

[Keith Knight]

So even though my pinion is a few inches above center the high pinion is even higher?

 

[MatthewWBailey]

I changed gears almost 7 years ago. Way before eco hubs. If I had a choice today I would probably go eco hubs but I don’t have my old gears to reverse it and install eco hubs.

Just a tidbit here. I have the 3.07s from when I purchased from MME. I put ECO hubs on in Feb. runs great, between 1400-1900 all the time. About 9.5mpg highway. Only drawback is I never use 7th gear. Off road is still limited by open diff slippage but I don't notice any gearing issue with going slow in 1.

 

[Ronmar]

So even though my pinion is a few inches above center the high pinion is even higher?

yep, the high pinion is all the way at the top

 

[Keith Knight]

Interesting, I do have a rear locker.
I would love to get 9.5 mpg. Just worried about off road situations where you want to creep up the rocks, Not rock bouncing because I have to keep the speed up.

 

[Keith Knight]

yep, the high pinion is all the way at the top

So what year did the high pinion start coming out?

 

[GeneralDisorder]

Here's the top feed unit on my 2008 (vs. center feed - what the military calls them):



There's no notes in the TM on the start serial number. I think it was around 2006 or 2007 that these were introduced. It was later than the 100,001 start of the A1R serial numbers. Obviously all the A1P2's are built this way. It's just a center axle diff from the MTV with the output blocked off and the power divider replaced with a spool.

Off road performance with ECO hubs is basically unaffected because you can fully load the TC and get it's 1.89:1 reduction that you normally wouldn't see due to the hub reductions not loading the TC enough to get the reduction out of it. You trade the 2:1 for the 1.89:1..... which is basically a straight across trade for all intended purposes. Low speed crawling is the same and with the 290, 330, or 370 HP engines you will run out of traction before you run out of torque.

Again. EVERYONE needs to read through the entire ECO hubs thread. This is all covered in minute detail.

 

[Keith Knight]

Here's the top feed unit on my 2008 (vs. center feed - what the military calls them):

View attachment 927425

There's no notes in the TM on the start serial number. I think it was around 2006 or 2007 that these were introduced. It was later than the 100,001 start of the A1R serial numbers. Obviously all the A1P2's are built this way. It's just a center axle diff from the MTV with the output blocked off and the power divider replaced with a spool.

Off road performance with ECO hubs is basically unaffected because you can fully load the TC and get it's 1.89:1 reduction that you normally wouldn't see due to the hub reductions not loading the TC enough to get the reduction out of it. You trade the 2:1 for the 1.89:1..... which is basically a straight across trade for all intended purposes. Low speed crawling is the same and with the 290, 330, or 370 HP engines you will run out of traction before you run out of torque.

Again. EVERYONE needs to read through the entire ECO hubs thread. This is all covered in minute detail.

Are you saying that is still true with eco hubs and 3.07 gears? And you definitely don’t mistake the high pinion’s set up.

 

[GeneralDisorder]

Are you saying that is still true with eco hubs and 3.07 gears?

Yes. The 3.07's are kinda falling down the backside of the ideal gear ratio curve but it's still a win. Ask @ckouba about his truck. It's an MTV ( M1088 ) chassis with a HUGE enclosure and it came to him with 3.07's. He loves the ECO hubs and has had zero issues off road with them. He has several threads on his experiences with them. I've taken my truck through the sand dunes and on trails here in OR and I don't notice a difference at low speed. Truck feels exactly the same. Just had quicker acceleration, higher top speed, and is overall quieter and cooler running. My radiator fan rarely kicks on even in the 100 degree temps we have been having.

 

[Keith Knight]

I’ll have to read his comments.
sounds like I might be ordering some eco hubs.
I would save about $1,700 every 10,000 miles in diesel.

 

[Ronmar]

All the specs I have seen for the TC, say 1.98;1 at stall... How much does your truck weigh keith?

 

[Keith Knight]

 

[Ronmar]

Nice axle balance!

 

[hike]

Back to seal purchases. Redoing our rear axle we purchased hub and CTIS seals from Oshkosh (OSE), I view OSE better than ebay and some others—

 

[Keith Knight]

Nice axle balance!

Thanks, I tried, planned, hoped to achieve that. After completing it 18 months ago I finally stepped on the scales. Kinda like getting on the bathroom scales, don’t want to know the truth. But I was super excited about the axle balance.

 

[MatthewWBailey]

You trade the 2:1 for the 1.89:1..... which is basically a straight across trade for all intended purposes. Low speed crawling is the same and with the 290, 330, or 370 HP engines you will run out of traction before you run out of torque.

I've been playing with this off road a bit on 3-5' step up berms around my property. (All with 3.07 diffs) With the old 2:1 hubs, you give a little pedal and it crawls over the step. With the eco, you give a little pedal and there's a slight delay, it builds and then crawls over the step, no overgear slippage. I feel like the difference simply requires a more proportional foot that before.

 

[Keith Knight]

Yes back to seals, Oshkosh sold direct? Do you have a link? And why only a few seals not all?

 

[Keith Knight]

I've been playing with this off road a bit on 3-5' step up berms around my property. (All with 3.07 diffs) With the old 2:1 hubs, you give a little pedal and it crawls over the step. With the eco, you give a little pedal and there's a slight delay, it builds and then crawls over the step, no overgear slippage. I feel like the difference simply requires a more proportional foot that before.

That is a great explanation, I appreciate! Thanks

 

[hike]

Yes back to seals, Oshkosh sold direct? Do you have a link? And why only a few seals not all?

Only doing rears right now. Fronts will be another time; looking forward to learning from you.

What are you using for a seal driver? The tool I found is $200, though I don't want to do this again, so $200—

 

[hike]

Yes back to seals, Oshkosh sold direct? Do you have a link? And why only a few seals not all?

CTIS Spindle Hub Seal - Oshkosh Equipment

Oshkosh Equipment - CTIS Spindle Hub Seal (5330-01-360-7753)

www.oshkoshequipment.com

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