Outer Limits 4x4 Board

Hey crew,

Hoping for a bit of input regarding rear diffs for my Hilux.

I have a Lexus V8 in my 1985 model (ex-diesel) tray back and the extra power killed my rear diff last weekend (stripped the pinion gear...), so I'm interested in a fix.

I am considering just putting in a ARB locker with a hardened crown and pinion gear set, but my concern is that if will just break again (Pinion and or axles).

I was considering grabbing a 75 series Cruiser Diff and changing the spring perches over for HiLux ones... question is:
1. has anyone done one before?
2. Are Cruiser diffs much wider than HiLux diffs (LN65), ie will I have to shorten it?
3. Can I get a set of diff ratio's to suit my current (standard) front diff?
4. If someone has done one, anything I should be looking out for in terms of complications and 75 series diff choices?

Thanks in advance for any input.

Cheers,

Shuey

Shuey wrote:Hey crew,

Hoping for a bit of input regarding rear diffs for my Hilux.

I have a Lexus V8 in my 1985 model (ex-diesel) tray back and the extra power killed my rear diff last weekend (stripped the pinion gear...), so I'm interested in a fix.

I am considering just putting in a ARB locker with a hardened crown and pinion gear set, but my concern is that if will just break again (Pinion and or axles).

I was considering grabbing a 75 series Cruiser Diff and changing the spring perches over for HiLux ones... question is:
1. has anyone done one before?
2. Are Cruiser diffs much wider than HiLux diffs (LN65), ie will I have to shorten it?
3. Can I get a set of diff ratio's to suit my current (standard) front diff?
4. If someone has done one, anything I should be looking out for in terms of complications and 75 series diff choices?

Thanks in advance for any input.

Cheers,

Shuey

I have done it with a 40 series housing. The cruiser diff centre is not in the middle of the housing ,it is offset so you need to cut and shut a bit. I cut the pumkin out of the cruiser housing leaving around a foot (from memory) on each side of it. I cut the axle tubes off a hilux housing and the actually fit inside the cruiser tubes so there is a lot more strength when you weld it all up(no dodgy butt welding). I made up a jig to keep everything straight etc, and welded it all up. The hilux axles are the same spline as the cruiser axles so they will slip straight into the cruiser diff.

Ratios are available for cruizer diffs, what do you have now?

You may find that the 4.1 ratio cruizer diffs may suit with your engine (depending on the terrain you drive).

I'd say it would have been done b4, but as said above the pumpkin is not centred so you will have weird tailshaft angles unless you centre the pumpkin or change your transfer case.
The 75 series is same width as hilux. If you are after wider track go for a 60 series diff or GQ Patrol (both 4.1 std ratios). The advantage of Patrol diff is centred pumpkin.
Whatever you do, you would almost certainly have to go with the 4.1 ratio to get a matching ratio for front diff- 4.1 high pinion out of 80 series recommended.

A Toyota Stout (old 2WD 1 tonne ute) had a centered cruiser size semi floating diff housing, I am not sure what width it ran and good luck finding one.
Peter.

droopypete wrote:A Toyota Stout (old 2WD 1 tonne ute) had a centered cruiser size semi floating diff housing, I am not sure what width it ran and good luck finding one.
Peter.

This is correct but they were the 'C' clip axle retaining setup that like to eat axles. If lucky to find a complet one and then in the future finding axles are a problem. Ive made up dozens of housings as detailed else where in this post and if the housings are supplied i charge $250 for the fabrication and it bolts straight in with all H/brake brackets, brake proportioning bracket etc and if you fit the Hilux diff flange to the cruiser diff (fine spline cruiser only) the tail shaft will bolt on as well.

Wally

Shuey wrote:Hey crew,

Hoping for a bit of input regarding rear diffs for my Hilux.

I have a Lexus V8 in my 1985 model (ex-diesel) tray back and the extra power killed my rear diff last weekend (stripped the pinion gear...), so I'm interested in a fix.

I am considering just putting in a ARB locker with a hardened crown and pinion gear set, but my concern is that if will just break again (Pinion and or axles).

I was considering grabbing a 75 series Cruiser Diff and changing the spring perches over for HiLux ones... question is:
1. has anyone done one before?
2. Are Cruiser diffs much wider than HiLux diffs (LN65), ie will I have to shorten it?
3. Can I get a set of diff ratio's to suit my current (standard) front diff?
4. If someone has done one, anything I should be looking out for in terms of complications and 75 series diff choices?

Thanks in advance for any input.

Cheers,

Shuey

90% sure The rear diff from a 75s cruiser has the same width but the pumkin is offset and the tail shaft will fowl the original lux tank and you can 4.56 to suit the front.try and get a later 7# rear diff they had disks

Hmm.. All great input guys... I though the diff center was centrally located on a 7# series.... Oh well, you learn something new every day.

I'm coming to the conclusion that I should stick with the original diff and just put my diff failure down to the age of the gear set.
I'm considering getting a gear set and axles cryogenically hardened... according to all reports this process can substanitally lengthen the lifespan of these components... any thoughts...?
Has anyone got any comments on aftermarket pinion and crown wheel strength??? Toyota lux axle breakage???

Cheers,

Shuey

Shuey wrote:cryogenically hardened... according to all reports this process can substanitally lengthen the lifespan of these components... any thoughts...?

pretty sure u want them softer not harder

slosh wrote:I'd say it would have been done b4, but as said above the pumpkin is not centred so you will have weird tailshaft angles unless you centre the pumpkin

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The tailshaft angle isn't a problem (will probably be better) your tailshaft runs on an angle anyway