[NewCaledonia]

Hi Guys.
I have a 2000 TFR54H00, 2WD.
Is it possible to put a rear axle that as a "low geared" (term used in part catalog) in place of the original rear axle?

The "low geared" comes from a 4WD as I understand it.
Appreciate any info on the matter
Thanks !

 

[Teddy Frank]

Based on the info you provided, you should be able to buy a “4wd” axle with lower gears. What gear ratio do you have, and what ratio are you trying to go to? And this is an npr you’re referring too, correct?

 

[mudoilngears]

Based on the info you provided, you should be able to buy a “4wd” axle with lower gears. What gear ratio do you have, and what ratio are you trying to go to? And this is an npr you’re referring too, correct?

It’s a pickup. Facelifted version of what the US got before 95, but with a diesel.

 

[Teddy Frank]

It’s a pickup. Facelifted version of what the US got before 95, but with a diesel.

My bad, now I know. Thank you🤙

 

[NewCaledonia]

I bought a rear axle for cheap that used to be on a 4WD. It's in good health, including brake drums, spring leafs,bearings, seals etc.

The idea was to just swap the whole thing because mine (2wd) has several problems 😅

But I'm wondering if it will create problem for the transmission ? It's a M75 MSG 5 speed.
I dont think it should but I'm prone to being wrong so I'd rather ask 😅
I'm not actually sure what the gear ratio is. No option code on the firewall plate.
But if I follow the parts catalog assemblies mine is 41/10
and the one I want to swap is either 41/9 or 43/9...
Also what speed difference is to be expected?
I'm pretty new at all this differential stuff..
Cheers 🙂

 

[Enemigo]

It shouldn't cause your transmission any issues, you're speedometer will not read correctly though. What kind of problems are you having with your current rear diff? It'd probably be less work to fix, or swap in an identical working unit from the same axle, than it would be to convert to a new axle.

 

[NewCaledonia]

Thanks for your answers guys,
My current diff has shot bearings and seal so it was probably runned without much oil. Have not opened it so usure if internal damage. It was not making noise thought so I think the gears should be alright.
I want to get if fixed but local isuzu dealer has zero parts. I ordered some on amayama but it's taking forever.
I got that complete 4WD rear axle for real cheap so I thought it would be the easiest, quickest way to get the car on the road.
I'm going to try to find some bearing/seal shop to get something to fix the diff, otherwise I'll probably swap the axles..
Appart from the axle/suspension/brakes tasks involved, is there anything else to do when doigt an axle swap?
Cheers 👍

 

[Enemigo]

Well, is it possible that only the gearset is different and you can just swap the third member without changing the entire axle?

 

[NewCaledonia]

I did not explore that option.. isn't messing with the wheels axle shafts more complex?
Since I'd have to pull them out a bit..
I'll look into that

 

[Enemigo]

I don't think so. I have not changed a third member, so I don't know if you'll have to set up the clearance on the gears again. If you do need to set-up the gears, that'll add some complexity. If you don't, then it's just bolt on stuff, but less than completely removing the axle and possibly having to deal with different mount locations for suspension components. Someone else will need to verify that for you. I think we might need more info about what you have, and what the other axle is to see if they are compatible.

 

[gruff54]

If axle was run w/o oil, you'd want to replace the axle bearings also. Been a while since I pullled a 3rd member so can't remember if bearings are pressed on to the axle. If so, use your original housing and the donor 3rd member and axles. I'd think that would be easier than swapping the whole assembly. But I've been wrong before.

Mike

 

[NewCaledonia]

Thanks for your replies guys, I'll be trying to make sure about what I have, see if changing the 3rd member is an option, I'll take some pictures,
Cheers!

 

[NewCaledonia]

OK guys.. sorry for the long delay.
I have been moving a lot and often in areas with no internet.

Long story short I had to change the whole axle and move it back an inch 😅
First are some pictures of the original 2WD axle third member.
Notice the little drawing that represent a gear (I suppose???) accompanied with a 5?

And here are pictures from the second axle
that came from a 1993 4WD.
Notice the drawing accompanied with a 7 this time.
Anyone know what they mean?

So the third member were very different.
I think the 4WD has limited slip while the 2WD is "normal" gears.
The size obviously were different.
The shafts were also bigger on the 4WD.

The 2WD was not holding oil at all and taking on water at every crossing.
So I made the move and swapped them.
Since the 4WD third member was larger but also longer, the propulsion shaft was now too long.

So decided to take the pin out of the spring leaves and move the axle back 1 inch.

Quite the adventure, in the middle of nowhere 😅!

Working great so far.
This axle is much healthier overall,with basically zero play or noise. Just a small leak from the left shaft that I need to deal with.
Also have to redrill the leaf springs and put the pin back just to be sure it wont move.

And so it definitely feels like it has lower gear ratio with more torque at low speed.
Just speaking from feelings though!

Anyway.. there is the answer to my questions 😁😅
Cheers!