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Old 06-30-2011, 06:31 PM   #121
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Ok, so I just got the axle shafts pulled and the 3rd member out. Oh, remeasured the bp and it is the 5 on 5.5. Sadly, it's the 28 spline..... also, I counted 44 teeth in the ring and 16 on the pinion giving it the 2.75 ratio stated on the ID tag. Good news, found out it is for sure the big bearing model! So now I know everything for sure about it. Now the build sheet begins... I want to to a lunchbox locker because of ease to instal and the price. Looking into a Richmond lockright if anyone has pros or cons on that.... From what I understand they work by the direction of force is on the axle shaft and pinion. When you are giving it gas it is locked, when you let off the gas to coast, it unlocks. Only concerns there is what does it do on long up hill gradual turns where you have to b on the throttle? Does it lock and chirp tires? Another concern is reverse, will it always b locked or unlocked in reverse, bad for mud good for pavement if unlocked and vice versa. If I'm wrong please correct me. I'm not 100% on how these things work and I want to make sure they fit my driving needs b4 I decide on one. Or if you have ideas of a locker that would work well for on the road at a decent price please let me know. Next issue I run into with installing this axle is ratio. Obviously 2.75 is not a ratio worthy of a wrangler on 31s. Currently I am on 31s and I think in the future with funds permitting I'm going to run the rk 3.5 lift and 1.25 body lift and 33s, mayb 34s. Again with budget and gear choice permitting, I may go to 35s later. So I know that 4.56 is too high for 31s and too low for 35s but with not everything going together at the same time would that b ok to put in with 31s? What would b my rpms n 5 at 65? Then when I switched to the 33s I know I wouldn't have any problems and most likely the 34s but how would 4.56s do on 35s? I think I'm set on 4.56, I'm just worried about the 31s and 35s. Again, any input welcome. Next thing I'd like to hit on is the bp. I really want to keep the 5 on 4.5 to save having to buy new rims right now and to avoid issues with rotating tires. Options I've considered is getting a set of triple drilled axle shafts to use the 5 on 4.5. Or if it's safe I could bolt a set of adapters to the front axle to get it closer to the width of the rear but I'm already running 1 3/4 spacers that I want to keep on unless they make adapters that are wider than that. 3" maybe? Then buy a set of cheap stealys. Or, I may look for some cragar uni lug rims and skip the adapter up front. Next, is shaft splines. I'm sure the 28 will hold up to anything I'll put it thro on 35s but if I'm putting a new locker in it and considering triple drilled shafts would it hurt to jump up to 31 spline? What can each spline and the actual gear set handle as far as tire size? I'm sure the housing can handle it well, especially trussed if I decide to do it.
Could someone address the locker function and the strength of the 28 and 31 spline axle shafts?

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Old 07-01-2011, 05:12 PM   #122
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Remember, if you decide to go with a 31 spline diff, then tell who ever you buy the diff from that you have a 28 spline third member as IIRC, the diff bearing saddles are different on the 28 spline third member as a 31 spline third member. So basicly you would need a bearing with an OD for a 28 spline and an ID for the 31 spline.

Donn
Question on this. I got a quote for a lockright and he said it's for the 2 pinion only. What does that mean and can you run a lunchbox 31 spline without changing the bearings? I think after some research I'm going to go with an Aussie which is only 31 spline. Would I have to get the separate bearing with that? Also, I saw IIRC. What's that stand for?

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Old 07-01-2011, 07:39 PM   #123
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Question on this. I got a quote for a lockright and he said it's for the 2 pinion only. What does that mean and can you run a lunchbox 31 spline without changing the bearings? I think after some research I'm going to go with an Aussie which is only 31 spline. Would I have to get the separate bearing with that? Also, I saw IIRC. What's that stand for?
Most of my experience with the ford rear ends is in the stock form where I narrowed them to use them in construction equipment, so not alot of locker or LS experience. The 2 pinion is most likely going to be with the open diff, the LS may have 4 pinion, I am not sure as I didn't come across them too often. As far as 31 spline Aussie, in a 28 spline diff, ask the sales person as they are the one you have to deal with if there is any problems, but if you are useing the same diff then the bearings shouldnt change IIRC = If I Remember Correctly.

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Old 07-02-2011, 06:56 PM   #124
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Most of my experience with the ford rear ends is in the stock form where I narrowed them to use them in construction equipment, so not alot of locker or LS experience. The 2 pinion is most likely going to be with the open diff, the LS may have 4 pinion, I am not sure as I didn't come across them too often. As far as 31 spline Aussie, in a 28 spline diff, ask the sales person as they are the one you have to deal with if there is any problems, but if you are useing the same diff then the bearings shouldnt change IIRC = If I Remember Correctly.

Donn
Ok cool. Thank you. Do you know much about how those work or what size tires I can run on each spline?
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Old 07-02-2011, 07:25 PM   #125
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I would just go with a 31 spline and be done with it, for now use stock axles if you are not going to go crazy with tire size and gears, but later on you can always get top dollar axles if stock can't handle your setup. When you install new axles, take finger nailpolish or paint and put a straight line down the center line of the axle, that way you can monitor how much twist gets permanently set in when ever you pull the axles and will have a good idea how much abuse you are putting them thru.

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Old 07-03-2011, 03:23 AM   #126
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I would just go with a 31 spline and be done with it, for now use stock axles if you are not going to go crazy with tire size and gears, but later on you can always get top dollar axles if stock can't handle your setup. When you install new axles, take finger nailpolish or paint and put a straight line down the center line of the axle, that way you can monitor how much twist gets permanently set in when ever you pull the axles and will have a good idea how much abuse you are putting them thru.

Donn
I think if I can find a set of shafts with 5 on 4.5 bp I'm going straight to 31 spline since it's going to b a dd with 35" max tire size. The nail polish and paint is an amazing idea. Never would have thought of that so thank you
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Old 07-03-2011, 03:28 AM   #127
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Do you know what tires the gear set and housing can safely handle? Also, would it b safe to bolt a wheel adapter to a 1 3/4 wheel spacer on the Dana 30 up front?
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Old 07-03-2011, 04:06 AM   #128
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Quote:
Originally Posted by 30-284

Remember, if you decide to go with a 31 spline diff, then tell who ever you buy the diff from that you have a 28 spline third member as IIRC, the diff bearing saddles are different on the 28 spline third member as a 31 spline third member. So basicly you would need a bearing with an OD for a 28 spline and an ID for the 31 spline.

Donn
What Bearing would I use if I went with a 31 spline lunchbox locker? The carrier stays the same but the 31 spline shafts are bigger around where they go thro the diff
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Old 07-03-2011, 01:15 PM   #129
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What Bearing would I use if I went with a 31 spline lunchbox locker? The carrier stays the same but the 31 spline shafts are bigger around where they go thro the diff
Thats why I said "tell who ever you buy the diff from that you have a 28 spline third member" as I have not installed any lunchbox lockers in this rearend, This way you get the information from the person you will have to deal with if any problems occur.

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Old 07-03-2011, 01:29 PM   #130
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Thats why I said "tell who ever you buy the diff from that you have a 28 spline third member" as I have not installed any lunchbox lockers in this rearend, This way you get the information from the person you will have to deal with if any problems occur.

Donn
Oh ok, I wasn't sure since the lunchbox keeps the factory carrier.
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Old 07-04-2011, 01:38 PM   #131
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Does anyone know what carrier bearings I'll use when I have the 28 carrier but im going to a 31 spline Aussie that retains the stock carrier?
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Old 07-05-2011, 02:25 AM   #132
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Bump to hopefully get help^ haha
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Old 07-05-2011, 02:48 PM   #133
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No help?
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Old 07-05-2011, 11:42 PM   #134
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Does anyone know what carrier bearings I'll use when I have the 28 carrier but im going to a 31 spline Aussie that retains the stock carrier?
If you are going to use the stock carrier, then you will use the stock bearings, your question to the salesman when you order should be "will the 31 spline aussie fit in the 28 spline carrier".

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