Low geared t-case/high geared axle?

Offroad use only.

Would a lower geared t-case (4.1) take on an extra load if the axle is geared high (4.10)?

The reason I ask, a friend has the same gearing in his rig as I do 6.32/4.1/4.10 (39.5 tire) and he toasted his rear input sliding gear and he was thinking it may have to do with running too high an axle gear as a result adding more load to the t-case.

Having the same setup got me thinking as well, is it possible that it has more to do with the tera low gears then the 4.10 axle gears. From what I’ve read tera low gears are not made as well as Lowmax gears. Thoughts?

 

Chuck
What was the damage to the gear ?

 

4.10's on a 39.5" tire is a tremendous load on any transfer gear the size of a Dana 20 or 300. Being as these are 4-1 gears I'd guess a 300 transfer case here.
Low Max gears are a little stronger than Tera Gears but Tera's run quieter and a little cooler. Almost a wash imho. I've installed many, many sets of both and have had no issues with either.

I'm also curious about the damage to the gear.

 

oops, never mind
I read 39.5 and saw 29.5
brain fart

 

His words,

"I started to climb a fairly good sized rock 1st gear about 400 rpm (idling ) and my jeep stoped moving and I started hearing a popping sound from the drive line. I got pulled out ( thanks to everyone who helped) put the jeep on the trailer then got it to the garage it's been sitting ever since. I pulled the t-case out today. Opened the inspection cover and found a bunch of broken teeth. The 4 to 1 is toast."


It looks to me like the rear input sliding gear was the only gear broken. If so I'm thinking an option would be to use the factory sliding gear. The original versions of the 4.1 kit did not include sliding gears. They reused the stock gears and he could do the same. The sliding gear that comes in the kit is cut slightly different to reduce backlash but I'm thinking he could use the original in their place.

Anyways, wondering if it's a gearing thing or tera low thing.

 

gearing thing
that would be my guess
too much tire

 

X2

R&P has some misc. new gears from both Tera and JB Conversions iirc. Might be worth calling them and see if they have the right one. 503-557-8911. I know last time we tried we couldn't buy just a couple gears from either of them.

 

I have an extra set of stock sliding gears left over from my 4.1 build if he wants them.

If it’s gearing its not good news for me, I received the 4.1 kit free in a deal so I installed it to make a stupid low 106.1 crawl so swapping my 4.10s to say 4.88 gets ridiculous for the east coast at 126.1

What would be the standard axle gearing where the load would be somewhat balanced in the above case in “offroad” situations?

 

chuck ,thats to low for the east coast,,,, you better sell them ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,heres my #

 

No doubt thats too much tire for the drivetrain you specified.
Too much tire = too much traction.
If the tires are reduced then tire slippage will occur before drivetrain destruction begins.

That said I'll suggest 3.15 Tera low with 4.89 final drive and the 6.32 transmission.
That comes out to a 97/1 crawl ratio.
Given sufficient traction V-6 torque should be able to idle up anything shy of 45* (100% slope) with 97/1 crawl reduction.

 

My original plans were for 37”, my thinking was the 4.10 would do, but 37” tires can be 34"-36" mounted so my concern became diff clearance with the 60s. My new 39.5 tires mounted on the rim but off the rig is 38.5 and 37” mounted on the rig.

At this point I’m not going backwards with the t-case or tranny. If need be I’ll re-gear the axles which means a different case split.

Edit: measured height at 20 psi

 

That’s a good point. It wasn’t mentioned earlier but my friend with the broken case is running 39.5 stickys a larger and softer tire then my 39.5 pitbull rockers.

 

Well then compare it to this....
The closest standard Kaiser design to your rig is probably the M715.
It has the 6.398 transmission with 1.96 transfer case and 5.86 final drive mounted on 9.00 x 16 tires (35.5" tall)

 

You should see some of the stuff I do in he neck of my woods. Sometimes I wish I had the tera low kit.

 

Taking a backwards step in this build at this point is going to hurt, not going to lie.

4.88 or 5.13 should be enough to ease the load on the t-case?

You guys have been very helpful, Thanks!

 

4.88 to 5.38 range would help on the transfer case. Not sure what engine or trans you're running (cant see that info on my I phone). If a Buick V-6 then a little lower. If a V-8 then the 4.88's. Understand that this will help, but that's still a lot of tire for the transfer case size and may not completely solve the issue.


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360/t-18/d-300

I have a couple options, re-gear the axles to 5.13s, and sell the 4.1 300 (I have an extra 300) for a 85.1 crawl, or run it as is maybe I'll stumble across an atlas before/if I break.

I'll continue on with the build and address the gearing issue at the appropriate time. Again, thanks!

 

my jeep is the one chuck is talking about,a couple of thoughts. what about having the dana300 gears cryogenically frozen (dont quote me on this but it makes them 30% stronger) as far as running a t18,4to1 dana300,5.13 gear being to low for new england wheeling there is always 2nd gear 65to1.and dont forget pit bulls area great tire they not a sticky tire. my plans are a 4.3 atlas and 5.13's in the diffs
rich

 

Bobby Long has done a lot with the cryo process for the Toyota folks and for strengthening Spicer ujoints. Might contact him. I don't have his contact info handy but if you do a search for Longfield Joints his site should come up. He's basically made the Toyota Birfield front joints workable with larger tires and for the rock crawler crowd.


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Rich, did you call about the broken gear?

Last night I read too many posts about guys having issues with the tera low kits and gears stripping, some on 33” with tired 304s and t-18/300 combo. A few would call the company and the best they would do was offer them gears at retail price plus shipping.

Their just opinions, but from what I read lowmax appears to be the quality gear set.