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Just wondering why the Lockrite 1510 locker only fits the front of the 86-88.5 model Samurai's? What makes these years different to older or newer?
 

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Just wondering why the Lockrite 1510 locker only fits the front of the 86-88.5 model Samurai's? What makes these years different to older or newer?
Should be 85-88.5 (Samurai was first offered to US market in 85)

The front differential in the 'older' (85-88.5) Samurai had what was refered to as a 4-pin differential. The 1510 is designed for that 4-pin differential. See the pic below from Spidertrax:
Lock-Right 1510 Locker

You can see how it was designed for a cross pattern (4-pin) diff.

When putting a lockright into the 'newer' model (90-95) it has always been suggested that you find the older moder diff and use it. The newer models had a 2-pin differential that was not as strong. The older diff is a bolt in upgrade, no adaptors, no problems.;)

*NOTE*
4-pin refers to the number of ends that are visible at the sides of the diff casing, not the actual number of pins (as seen above, there are actually only 3)
2-pin refers to the actual number of ends visible (although it really only has a single pin visible at both ends).
Confused? Welcome to the addiction.
 

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Discussion Starter #3
Thank you.
So the only difference is the amount of pins? The side gears are the same and all? Just weaker because of only having two pin?
 

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Thank you.
So the only difference is the amount of pins? The side gears are the same and all? Just weaker because of only having two pin?
I want to say yes, basically the same, but with my luck it isn't... I will check the old parts bin when I get home.

I make it a rule to swap out the lighter 2-pin diffs for the more reliable 4-pin models for all the zooks I have built - especially if they are getting lockers. So I have a few in the bins.
 

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The flange size may be different. I had to swap my old Driveshaft flanges on to my new 3rd members. Otherwise it bolted right in.
 

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The flange size may be different. I had to swap my old Driveshaft flanges on to my new 3rd members. Otherwise it bolted right in.
The Samurai had two different flange sizes. Unfortunately, that was one of the parts that changed over the 88-88.5-89-90 model years. The lines just used the small flanges until they were used up and then they switched to the large pattern. The thing is, they didn't all change at once. You can find either size of flange on any model from 88 to 90. The good part is that they are all interchangeable. If you get a late model set of flanges (stronger/larger bolts) they will fit an older model Sammy (as long as you also swap to newer shafts). Some aftermarket vendors use newer flanges drilled to except either bolt pattern.
 

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I'm new in the forum, just got me a Suzuki Samurai 91 model and I'm currently giving it a nice paint job and will be doing some nice upgrades to it soon.

What your saying sounds a little wierd. The spider side gears in the diff definitely need three pins, not two, to operate properly. How can you operate them with only two gears?
 

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What your saying sounds a little wierd. The spider side gears in the diff definitely need three pins, not two, to operate properly. How can you operate them with only two gears?
As written above:
------------------
*NOTE*
4-pin refers to the number of ends that are visible at the sides of the diff casing, not the actual number of pins (as seen above, there are actually only 3)
2-pin refers to the actual number of ends visible (although it really only has a single pin visible at both ends).
Confused? Welcome to the addiction.
------------------
 

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Discussion Starter #11
I found this one, looks like it is a Vitara diff?


And the side gears have a ring around them, but are they the same/will they fit the Powertrax 1510 locker?
 

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It will physically fit in the carrier, but the first time you jump on it in a full traction situation and you will snap one or both of the center discs in half. With support in all four slots it will spread the pressure, but with only a single pin across only two slots the discs will split in half. And from personal experiance, the company has a reputation of not replacing parts under warranty if they suspect abuse.
 

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Ah, I get it. The one with four pins (sticking out of the sides) is with four spider gears, and the one with two pins is with only two spider gears. The more the hears the better, I guess, to give it more strength.
 

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Ah, I get it. The one with four pins (sticking out of the sides) is with four spider gears, and the one with two pins is with only two spider gears. The more the hears the better, I guess, to give it more strength.
Bingo!
;)
But when you install a locker, the locker discs replace the spider gears. The discs sit directly over the pins. Think of the pins as the rebar in a cement pad. The more rebar, the stronger the pad.
 

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Bingo!
;)
But when you install a locker, the locker discs replace the spider gears. The discs sit directly over the pins. Think of the pins as the rebar in a cement pad. The more rebar, the stronger the pad.
I'm trying to imagine how the locker will fit, because I am planning on getting one, and my Samurai is 91 year model. So according to you, it has only two pins (One actually). Spidertrax lockers have the option of getting 26 spline side gears, or without them, if yours are ok. So how will the locker discs interface with the stock side gears? And is it possible to drill a couple of holes and install the other two pins?

I'm planning to opt for the one without side gears, because I don't want to change my 22 spline axles. What do you suggest?
 

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The Lockrite style locker you are referring to is sold with or without sidegears. The sidegears they provide make a much harsher 'grab' and thus are not the preferred choice on the trail. Use those on the race track for straight line ( 1/4 mile) style racing.
Use Suzuki sidegears and you will be happier. Less breakage, smoother transitions.
You will be happiest if you can source an early model four pin carrier and then install the lockright with factory sidegears. Trying to modify the 2 pin carrier isn't worth the time or energy.
 
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