Identifying gearing....

[RckyMntnKng]

Alot of the axles out there from years past are missing the Id-tag on the pumpkin listing the original ring gearing.

Can someone explain how to "count the teeth" or whatever it is you do, to identify the gear ratio in an unknown axle?

Thanks!

[estig70]

Originally Posted by RckyMntnKng

Alot of the axles out there from years past are missing the Id-tag on the pumpkin listing the original ring gearing.

Can someone explain how to "count the teeth" or whatever it is you do, to identify the gear ratio in an unknown axle?

Thanks!

Remove rearend cover, count number of teeth on the Ring gear (larger gear) and count number of teeth on the pinion gear. Divide number of teeth per ring gear by number of teeth per pinion gear and you get your gear ratio.

Eric

[RckyMntnKng]

Much appreciated!

[Burt4x4]

I forget the formula but look for a stamped number on the ring gear then google that number..somethign like 41:11 is 3.73ratio

I found this on google:

ratio 3.08 3.42 3.73 4.10 4.56 4.88 5.13 5.38
teeth 40-13 41-12 41-11 41-10 41-9 39-8 41-8 43-8

so 41-9 teeth is 4.56 ratio

[RckyMntnKng]

great.

So if you were changing from 4.10 to 4.56 that is only one less tooth on the pinion gear. Would you leave the ring gear the same.

[Burt4x4]

No, you have to change both Ring & Pinion as a "set". Not only is the tooth count different but the angle of the teeth as well need to match

[RckyMntnKng]

Of course they would make it that way!

[RckyMntnKng]

Pulled the cover off my old d44 6 lug I had on the rear before my 14 bolt to try out the gear counting.

I came up with 43-14 or 3.07 gearing.

What do you call the other gears in there? I saw the ring and the pinion as well as 4 other gears in the center section.

[Burt4x4]

The small gears is your differential (sp?) 'spider' gears. A cheep way to make a locker it to weld thoes gears togeather.

This is my old D60 rear, it has a Dana Powr-Lok posi/limitied slip diff in it.

Found this on google
Basic open diff, no traction devices used, factory OE type diff = One leg burnout

[estig70]

Originally Posted by RckyMntnKng

Pulled the cover off my old d44 6 lug I had on the rear before my 14 bolt to try out the gear counting.

I came up with 43-14 or 3.07 gearing.

What do you call the other gears in there? I saw the ring and the pinion as well as 4 other gears in the center section.

that is correct my friend. A little high for a 4x4 in my opinion, of course depends on what you use it for.

Eric

[LONGHAIR]

Originally Posted by Burt4x4

The small gears is your differential (sp?) 'spider' gears. A cheep way to make a locker it to weld thoes gears togeather.

Please, don't do this. Not only is it dangerous and destructive, it's just plain hard to drive on the street or anywhere else for that matter. It is hard to turn and makes the truck tend to "push" or "plow" instead of following the steering.

[Burt4x4]

Originally Posted by LONGHAIR

Please, don't do this. Not only is it dangerous and destructive, it's just plain hard to drive on the street or anywhere else for that matter. It is hard to turn and makes the truck tend to "push" or "plow" instead of following the steering.

Very true, I have never had a "lincoln" locker (no clue why some call it that) hahaha and The guys I have seen run this only have it in the rear and are mostly off-road only rigs

[Yukon Jack]

The nickname came from people doing the welding with a Lincoln welder.

[Burt4x4]

Well Duh! hahahahah
Just didn't put the connection in my head I guess!
THanks YJ
Have a good weekend!

[bmeredith]

i love my "hobart" locker. i think saying that it is dangerous and destructive is way out of line. it is no different than a spool. in fact it behaves the exact same as the detroit locker, on and off the road, that was in the axle before i welded it up. it'll certainly wear your rear tires down twice as fast though.

[LONGHAIR]

Originally Posted by bmeredith

i love my "hobart" locker. i think saying that it is dangerous and destructive is way out of line. it is no different than a spool. in fact it behaves the exact same as the detroit locker, on and off the road, that was in the axle before i welded it up. it'll certainly wear your rear tires down twice as fast though.

It is not "out of line" at all....I have personally seen them fail. The vehicle will make a very hard jolt/jump to one side, it can also pull the steering wheel out of your hands. Is anyone or anything nearby?

Second, no one ever disassembles/degreases the entire unit in an "attempt" to do it as properly as possible.....though I don't believe it is possible. Those gears were not intended to be welded upon, they shatter when they fail, it is sudden. So, they end up getting welded right there in the housing with spatter and slag going everywhere...not good for the bearings or the ring and pinion.

Welded spiders do in fact act exactly like a spool (except the failure part) but that is NOT the same as a "Detroit Locker". "Lockers" are not spools, they do "unlock" one wheel to have "defferential action". This action is somewhat predictable, but you do need some experience with driving one.
BTW, I wouldn't run a spool on the street either......

Tire wear? double I don't know about, but it is certainly accelerated. Not to mention that you absolutely cannot stop that "squeeling" when turning on pavement, every turn every time. Do you want to have to explain that to the police? more than once?