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Old 03-29-2014, 09:11 PM   #1 (permalink)
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Question Samurai axle housing swap

Hey guys. Ive been doing quite a few searches on here and haven't really found the answer to my vehicle specific question. I have a 1988 Samurai that is a trailer to the mud hole for a weekend only type of vehicle. I came across a pair of complete Samurai front and rear ends with stock 3.73 gears from a Samurai from the 86-95 era. So I have 2 questions about them.

1) Do all the front and rear ends from 86-95 bolt right up to each other? Same flange, same leaf supports, ect? If not, how can I tell what year they are from when I go take a look at them tomorrow?

2) I have 37'' tires for it right now. I realize the 3.73 gears are not ideal for that large of a set up on the 1.3L motor. Will I be able to make due with the 3.73's for just playing around in the mud in 4x4 in 1st gear. Never need to go faster than 7mph or so.

Please don't tell me that I shouldn't be running those tires on stock axles and all that stuff haha....I know its pushing it, but this is just a low budget weekend warrior to mess around in for a couple hours.

Thanks in advance for your input and enjoy the weekend guys.

Ryan
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Old 03-30-2014, 01:21 AM   #2 (permalink)
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Low range is your savior. Aside from the obvious gearing issues which you already seem to know about, the OEM transfer case mounts are quite fragile and will be under enormous stress with this setup.

Someone else may be able to answer your question on parts compatibility.
Good luck and happy trails.
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Old 03-30-2014, 08:53 AM   #3 (permalink)
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Thanks!

Anyone else know about the compatibility question? I am going to take a look at these in a couple hours and any help would be greatly appreciated.

Ryan
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Old 03-30-2014, 10:21 AM   #4 (permalink)
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Makin, late model Samurai's ( I believe it is from 91 to 96 ?) have only 2 spider gears in them making them weaker than Early diff's which have 4 spider gears. This is one way to tell early from late diffs. The complete axles will bolt in from 1986 to 96 (or to what ever year they quit importing them into the US)
Is something wrong with the axles on your rig ? why do you think you need to replace them with the exact same axles you already have on your Sami ?

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Old 03-30-2014, 10:26 AM   #5 (permalink)
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Yea the axles on them now are shot. Rear diff is blown. Both leak from every seal possible. And have been lubricated with 50% water 50% mud for who knows how long. So I came across a set of replacement axles and said to hell with a rebuild ill just swap these in.
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Old 03-30-2014, 10:56 AM   #6 (permalink)
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Yep they are a direct replacement.
A couple things that I'd do if it was my rig... modify the diff's to fozzy lockers. You disassemble the diffs and weld the spider gears to lock up the front and rear diffs. Ack's FAQ Fabbing a Fozzy Locker Just make sure you mark your adjusters and count exactly how many turns the threads are adjusted to so you can assemble them back the way they came. While you have them apart weld an axle truss on the top of the front axle Toyota '79-'85 Front Axle Truss The toyotas fit really well with minimal trimming.
Then get some lower transfer case gears and don't forget to extend your diff vents as high as you can get them in your rig.
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Old 03-30-2014, 11:20 AM   #7 (permalink)
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With the front locked up it's going to be harder to steer. One way to make it a little bit better is to go with a lock right locker. You will still have to muscle the steering wheel through turns bit it will steer better than a welded diff.
Make sure you have enough grease in your birfield joint. Your steering knuckle seals are where the water is getting in your axles. When you hit a mud puddle it forces water and mud into your axle. Amsoil has a synthetic grease that repels water and racers use it on VW/Porsche CV joints cause if they tear a CV boot the dirt and dust will not penetrate the grease, it just sticks to the outside of the grease, the stuff is really thick. I used to remove the knuckle pivot pins to drain the water out of the steering knuckles.
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Old 04-15-2014, 10:28 AM   #8 (permalink)
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Quote:
Originally Posted by Makin-Sammies View Post
Hey guys. Ive been doing quite a few searches on here and haven't really found the answer to my vehicle specific question. I have a 1988 Samurai that is a trailer to the mud hole for a weekend only type of vehicle. I came across a pair of complete Samurai front and rear ends with stock 3.73 gears from a Samurai from the 86-95 era. So I have 2 questions about them.

1) Do all the front and rear ends from 86-95 bolt right up to each other? Same flange, same leaf supports, ect? If not, how can I tell what year they are from when I go take a look at them tomorrow?

2) I have 37'' tires for it right now. I realize the 3.73 gears are not ideal for that large of a set up on the 1.3L motor. Will I be able to make due with the 3.73's for just playing around in the mud in 4x4 in 1st gear. Never need to go faster than 7mph or so.

Ryan
In 88.5....
They changed the driveshafts and pinion flanges to the "large" bolt pattern. They used larger bolts and the spacing between the holes is farther.
They went to a single rear brakeline for the rear axle. The earlier ones used 2 brakelines from the frame to the lines on the axle.
They also went to a single crosspin front carrier and a different carrier design. Which both are a weaker design than the early 86-88 design.

All 86-95 samurai axles will have the same spring perches and perch spacing on the axles. So that part of a swap isn't an issue.
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