Changing high range gear in TC - D1

[edddo]

I'm looking at buying a D1 (again).
Problem with it is that it has been fitted with 4.37 Ashcroft diffs ( air locker type).
So these would be good to leave in it.
It is a 5 sp manual tdi running 32's.
It revs at about 2900 at 100kph. This leads me to believe that it has 1.3 high range gear in the TC..unless the tacho is over registering for some reason (pretty sure it has correct alternator and pulley)

Is it viable to replace the high range gear in the transfer case?
Using the Ashcroft ratio calculator, a 1.1 or 1.0 high would bring it back to near standard highway revs.

Opinions?

[loanrangie]

Early lt230 had a 1.003/1 ratio high range but not sure if that can be fitted to the later lt230.
I would be more inclined to change the diff ratio's back to 3.54.

[Tins]

I would be more inclined to change the diff ratio's back to 3.54.

I think so would I. No need to lose the locker function, just swap C&Ps. Not cheap, but neither is changing ratios in the LT230.

[Slunnie]

I was going to say, if you change the transfer, then you can have good reduction in low range which is important in a manual. But on the flip side, although the Ashcroft fanboys will have you believe these CW/P are stronger than any diff on the planet, the reality is that the pinion is getting pretty small with that ratio. I tend to agree with 3.54s or more so a ratio that will suit the 32's.

BTW, I do run Ashcroft kit too, it is good kit, but we just need to keep it real.

[Tins]

I was going to say, if you change the transfer, then you can have good reduction in low range which is important in a manual.

I would consider selling my MaxiDrive reduction drive LT230 if the right offer arrived..[bigwhistle]

It would come with a MD rear locker, and, speaking of Ashcroft, a suffix L R380 with less than 30k on it. I'd throw in the rest of the D1*.

*Some assembly required, Batteries not included.

[edddo]

OK- I'm getting that forum wisdom might mean I let this D1 go. A lot of the perceived value in it is the new diffs and the lockers ..so to swap them out for standard 3.54's is not that attractive an option..and also pretty expensive although I might be able to sell the 4.37's.

[edddo]

I would consider selling my MaxiDrive reduction drive LT230 if the right offer arrived..[bigwhistle]

It would come with a MD rear locker, and, speaking of Ashcroft, a suffix L R380 with less than 30k on it. I'd throw in the rest of the D1*.

*Some assembly required, Batteries not included.

tell me more.

[Slunnie]

OK- I'm getting that forum wisdom might mean I let this D1 go. A lot of the perceived value in it is the new diffs and the lockers ..so to swap them out for standard 3.54's is not that attractive an option..and also pretty expensive although I might be able to sell the 4.37's.

With 4.37's it is really setup to run 35" tyres. Thats another option.

[Tins]

With 4.37's it is really setup to run 35" tyres. Thats another option.

Needs engineering, at least in Vic.

[Tins]

tell me more.

94 300 TDi. Rough. Was a daily for a while. I didn't care about its looks. It has sat for a while. Was always a "gunna", but now life events have overtaken me. Cosmetics aside, I always preferred it to my D2 to drive, especially off road. It has the bones for a good project or as a donor car. I was considering it for a ute conversion. Not currently running, halfway through a timing belt job, all parts for that included.

As I now have certain health complications I need to accept that I'm never going to do anything with it. If you, or anyone else, is interested then I'll talk.

[Tins]

94 300 TDi. Rough. Was a daily for a while. I didn't care about its looks. It has sat for a while. Was always a "gunna", but now life events have overtaken me. Cosmetics aside, I always preferred it to my D2 to drive, especially off road. It has the bones for a good project or as a donor car. I was considering it for a ute conversion. Not currently running, halfway through a timing belt job, all parts for that included.

As I now have certain health complications I need to accept that I'm never going to do anything with it. If you, or anyone else, is interested then I'll talk.

After Tuesday I will be out of commission for a while, but I'll still be talking 🤞

[edddo]

With 4.37's it is really setup to run 35" tyres. Thats another option.

Yeh..I have no interest in that option.

[edddo]

94 300 TDi. Rough. Was a daily for a while. I didn't care about its looks. It has sat for a while. Was always a "gunna", but now life events have overtaken me. Cosmetics aside, I always preferred it to my D2 to drive, especially off road. It has the bones for a good project or as a donor car. I was considering it for a ute conversion. Not currently running, halfway through a timing belt job, all parts for that included.

As I now have certain health complications I need to accept that I'm never going to do anything with it. If you, or anyone else, is interested then I'll talk.

No good re the health situation mate.

But it doesnt sound like what I'm after. I want something somewhat presentable, and white.

[Tins]

No good re the health situation mate.

But it doesnt sound like what I'm after. I want something somewhat presentable, and white.

Aaah. I thought you were looking for options for something you already had. No, mine wouldn't suit.

[edddo]

Anyone had experience of a tacho on a 300tdi over registering by a constant %?
Pulley diameter seems about right.
Anything else known to produce this?

[TonyC]

Anyone had experience of a tacho on a 300tdi over registering by a constant %?
Pulley diameter seems about right.
Anything else known to produce this?

I'm no electronics guru!

But.

The tachometer is reading the AC frequency from the alternator, so I can't see how that side could misread.

But, there are two alternator pulley sizes (and therefore two belt lengths) in a 300Tdi, I assume Defender v Disco.

Tony

[TonyC]

I'm looking at buying a D1 (again).
Problem with it is that it has been fitted with 4.37 Ashcroft diffs ( air locker type).
So these would be good to leave in it.
It is a 5 sp manual tdi running 32's.
It revs at about 2900 at 100kph. This leads me to believe that it has 1.3 high range gear in the TC..unless the tacho is over registering for some reason (pretty sure it has correct alternator and pulley)

Is it viable to replace the high range gear in the transfer case?
Using the Ashcroft ratio calculator, a 1.1 or 1.0 high would bring it back to near standard highway revs.

Opinions?

Easy to check the diff ratio.
Lift one set of wheels, F or R turn the wheels together, or lock the diff, the count how many times the tailshaft turns.

The 1.3 transfer is an Ashcroft special.

I don't know how hard it is to change.

Tony

[edddo]

Easy to check the diff ratio.
Lift one set of wheels, F or R turn the wheels together, or lock the diff, the count how many times the tailshaft turns.

The 1.3 transfer is an Ashcroft special.

I don't know how hard it is to change.

Tony

Yes the diff ratio is established.. It is 4.37...done as you described.
He thinks the pulley on the alternator measures correctly, although it is hard to measure precisely in situ.
How would I/he check the TC high range gear ratio?
I suppose it could be done by turning the raised wheels while in 4th gear high range (4th is 1:1) and counting engine revolutions. The maths could be done now that the diff ratio is confirmed.

[loanrangie]

what size tires are on it ? does it idle at roughly 750 ?