Author Topic: Rear brakes  (Read 1047 times)

Alan

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Rear brakes
« on: February 21, 2018, 06:37:37 AM »
Doing some research for upgrading my Gen 1 (3.0 V6, Petrol, 5-manual) with Gen 2 parts.

I currently have rear drum brakes. These are shot, so I need new brakes. I would rather get disc brakes (more stopping power and easier maintenance), so looking into the options of fitting Gen 2 disc breaks.

Used Gen 2 parts are hard to come by in my neck of the woods, so the chance of getting a 96 rear axle with disc brakes and diff lock (the most preferred rear axle swap if my research is correct) is very slim. There are some Gen 2 rear axles available though. Found a 1992 2.5 TD, 1993 2.5 TD, 1995 2.8 TD, 1995 3.5 Petrol. As I understand swapping these complete axles will be difficult. So I was wondering if it is possible to 'just' strip the axle shafts with the disc brakes of a Gen 2 rear axle and switch these with the axle shafts with drum brakes on my Gen 1. (This would mean I would keep my current diff.)

Any advice/knowledge is much appreciated!

TOASTY

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Re: Rear brakes
« Reply #1 on: February 21, 2018, 07:37:29 AM »
Any of those axles will not be difficult, they are pretty much a bolt in affair. There is an oddball pinion flange on the larger 9.5" rear axle but those are only on 1994 models. I understand you're not in the US so watch out om '93s too, if you find the smaller 9" (3.0 and 2.5 engines) it should be a fully bolt in and go deal. If you get the larger axle (3.5 and 2.8 engines) you may need to companion yoke from the donor trucks driveshaft. It's still not a hard job but if you haven't done U-Joints before they can be tricky without proper tools.

Alan

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Re: Rear brakes
« Reply #2 on: February 21, 2018, 07:50:07 AM »
Ah I see. Thanks for your explanation, TOASTY!  8) I am relieved to know those axles will do the job as well. I'll be on the look out for the smaller 9" then.
Might begin a little earlier with collecting parts than planned (don't tell the missus though ::)), and this is top on my list.

Alan

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Re: Rear brakes
« Reply #3 on: February 21, 2018, 11:28:12 AM »
Just to double check: what role do the gear ratios have with an axle swap?

TOASTY

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Re: Rear brakes
« Reply #4 on: February 21, 2018, 04:36:45 PM »
 Just make sure the donor axle ratio matches your current axle. Mismatch and BOOM!

JohnnyBfromPeoria

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Re: Rear brakes
« Reply #5 on: February 21, 2018, 08:04:45 PM »
Just make sure the donor axle ratio matches your current axle. Mismatch and BOOM!

IF you put it in four wheel drive, that is.

John B.
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Alan

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Re: Rear brakes
« Reply #6 on: February 22, 2018, 04:28:59 AM »
Ah yeah, ok. So I searched the forum/internet and found the following.

My Gen 1 has this ratio:
3.0 V6 = 4.625, 4.875
Transfer Case = 1.925:1 for 3.0 V6

The Gen 2's have these:
2.6 = 4.875
2.5TD & 2.5TDI = 4.875, 5.29
3.0 V6 = 4.625, 4.875
2.8D = 4.875
2.8TDI = 4.90
3.5 DOHC V6 = 4.636
Transfer Case = 1.925:1 Low Range for 2.6, 2.5TD, 2.5TDI & 3.0 V6, 1.90:1 for 2.8TDI & 3.5 DOHC V6

Best would be to find a Gen2 3.0 V6. But these Gen 2's are extremely rare here.
Would a 3.5 be close enough: 4.636 vs 4.625 and 1.925 vs 1.9?

TOASTY

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Re: Rear brakes
« Reply #7 on: February 22, 2018, 07:45:07 AM »
You can run 4.625 & 4.636 front and back or 4.875 and 4.90 front and back. Check your ID plate on the firewall for your specific ratio, like you found it could be 4.625 or 4.875.

Alan

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Re: Rear brakes
« Reply #8 on: February 22, 2018, 10:57:40 AM »
Roger! I have 4.625, so I'll keep an eye on the 3.5 :D
« Last Edit: February 22, 2018, 11:03:12 AM by Alan »

Alan

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Re: Rear brakes
« Reply #9 on: January 07, 2019, 08:25:00 AM »
Hello there,

It's been a while. My Pajero has been in storage the last year, but I hope to start doing some work next month. Rear axle replacement being my first task.
I might have found a Gen 1 rear axle with disc brakes matching my diff (4.625), but it's from a SWB 2.5 TD. The yoke is not included. Am I right to conclude that this will not fit my LWB 3.0 Petrol without the yoke?
According to the following information the diff diameter does not correspond (8 vs 9):

Axle Data

Gen 1

2.6, 2.3TD, 2.5TD & 2.5TDI (some) :-
front axle = 25 spline, 29mm diameter, diff = 7.25" diameter (low pinion)
rear axle = 28 spline, 30.5mm diameter, diff = 8" diameter
3.0V6 :-
front axle = 28 spline, 29mm diameter, diff = 8" diameter (low pinion)
rear axle = 28 spline, 30.5mm diameter, diff = 9" diameter

Thanks in advance!
« Last Edit: January 09, 2019, 02:37:25 AM by Alan »

KrzyDav

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Re: Rear brakes
« Reply #10 on: January 10, 2019, 02:53:16 AM »
 In USA  all Gen 1s got only rear drums.
In USA early Gen 2s  (92-93 in USA) had 9" open (4.62), locker (4.88) , or LSD (4.62)--with disc rear . This is what I put in my Gen 1 3.0 SWB.
As I recall I didn't need Gen 2 drive shaft to get its flange,,,my shaft bolted up.
The 9.5 has a bigger flange on diff. and therefor on driveshaft. You need that driveshaft flange.
All the above used same part number U joint.
The '94 4.63 locker (in USA) had a Giant one year part number U joint and therefore the rarer giant flange on diff..
I stayed with 9" because it is still bullet proof and I prefer LSD for my use and still get the easy maintenance rear disc.
.
 In USA to add to confusion on  front diff. got low pinion on Gen 1 ( 7.5 on 2.6,,,8" on 3.0) and high on Gen 2 and M. Sports.
M. Sports could have drum  or disc brakes  with 9" or disc 9.5. I'm still trying to figure out M. Sports to see if front diffs will fit into  gen 1.

I prefer to swap whole axle as gear work is beyond my skill set so I'm not sure on axle spline count,,,although I read it on ADD forum somewhere that I can't relocate right now.
« Last Edit: January 10, 2019, 03:00:34 AM by KrzyDav »

MudRaider

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Re: Rear brakes
« Reply #11 on: February 11, 2019, 07:34:10 AM »
I second that whole axle swap. Any excuse to not deal with 90w gear oil.

DezRacer25

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Re: Rear brakes
« Reply #12 on: February 11, 2019, 03:02:29 PM »
I still like his original idea. If I already have upgraded gears and ARB I wouldn't want to get rid of those for disc brakes but if I could take gen 2 disc brakes only and upgrade my current axle to discs from drums. My rear drums stop pretty good but I'm sure rear discs with the right master cylinder and proportioning valve would be better.
Do it today for tomorrow it will be illegal!

MudRaider

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Re: Rear brakes
« Reply #13 on: February 18, 2019, 07:59:40 AM »
I still like his original idea. If I already have upgraded gears and ARB I wouldn't want to get rid of those for disc brakes but if I could take gen 2 disc brakes only and upgrade my current axle to discs from drums. My rear drums stop pretty good but I'm sure rear discs with the right master cylinder and proportioning valve would be better.

Not sure where you saw he already had ARB and gears. Alan, swapping an entire axle in is generally a lot easier than swapping gears, d iffs, all that crap. Any ANY! Of those Gen 2 you have available will bolt in. Period.a simple check of the tag in the engine compartment will verify the gearing.. The only problem that can come up is bolting your driveshaft to the flange on the donor rear axle. And Mitsubishi seems to have thought about that. There is a locating ring on the back of the axle where it bolts to the rear end.. The locating ring is the same size between the 2 bolt patterns available. How does that help you? If your donor axle has the large bolt pattern, and your driveshaft is the sm as ll pattern, you simply center the driveshaft in the axle flange, then drill 4 new bolt holes. And your done. It really is that simple.

DezRacer25

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Re: Rear brakes
« Reply #14 on: February 25, 2019, 06:11:32 PM »
I was talking about me because I have an ARB in the rear with drum brakes but would like to swap discs on to my rear housing.
Do it today for tomorrow it will be illegal!