Maxi/MR Automotive -49% low gears

[ashtrans]

Hi,

I am guessing these are straight cut ?

are they easy enough to fit ?

most importantly, how noisy are they compared to stock ?

many thank's

Dave

[LowRanger]

Hi,

I am guessing these are straight cut ?

are they easy enough to fit ?

most importantly, how noisy are they compared to stock ?

many thank's

Dave

Dave

Yes the gears are straight cut.

The 49% gears require a bit of grinding of the case.The 30% gears do not

The 49% gears sound as noisey as my LT230 with gears that are not quite meshed properly ie They howl like a banshee.

Oh yeah,hurry up with the underdrives :DI am feeling the need for another:p

[Bush65]

Dave

Yes the gears are straight cut.

The 49% gears require a bit of grinding of the case.The 30% gears do not

The 49% gears sound as noisey as my LT230 with gears that are not quite meshed properly ie They howl like a banshee.

Oh yeah,hurry up with the underdrives :DI am feeling the need for another:p
I put a 30% under gear set in my old LT230, before the 40% sets were available and you most certainly do need to grind the case, and the selector shaft. It said so in the written instructions and was in fact the case.

However I do not know if Mal may have changed the gears later. From the Maxi-drive documents in the files section here, the final reduction gear sets are:
20 teeth x 55 teeth for the 30% gear set
24 teeth x 71 teeth for the 40% gear set

Obviously smaller teeth for the 40% gears.

I don't have anything on the 49% gear set.

[uninformed]

John, Im not 100% but I dont think there ever was a 40% reduction set. Just the 30% first and then MD added the 49%.

Ill see what I can dig up.

Dave, do you want me to make a sound recording and email it to you?

cheers
Serg

[LowRanger]

The 30% gears required minimal grinding of the case and slight mod of the selector shaft and also a mod of the drain plug,to stop from hitting the gears.These mods could easily be done with minimal material requiring to be removed.

[LowRanger]

John, Im not 100% but I dont think there ever was a 40% reduction set. Just the 30% first and then MD added the 49%.

Ill see what I can dig up.

Dave, do you want me to make a sound recording and email it to you?

cheers
Serg

Serg
I think you are correct,as I remember Mal saying that it wasn't really viable,due to the material that would have to be removed,due to the gear size.
But I do remember there being talk of it being available by special request.Not sure how true it was though?

[Slunnie]

Do these things still get sold?

I could be wrong, but I'm sure when Tusker on here had his 49% gears fitted that a shaft had to be sent to Maxidrive for machining. Or.... am I talking rubbish.

[uninformed]

Do these things still get sold?

I could be wrong, but I'm sure when Tusker on here had his 49% gears fitted that a shaft had to be sent to Maxidrive for machining. Or.... am I talking rubbish.

Yes, M R Automotive make them, Barry from Hi-Tough Engineering does some of the machine work on them. I think it may be an exchange thing??? not sure though....

[Barefoot Dave]

Dave, forgive me if I am wrong, but isn't MR/MAXI your competitor?
Not quite kosher doing market research on their products through the forum, I would have thought:(
I am, of course, open to being corrected.
Cheers, Dave.

[Lotz-A-Landies]

Dave, forgive me if I am wrong, but isn't MR/MAXI your competitor?
Not quite kosher doing market research on their products through the forum, I would have thought:(
I am, of course, open to being corrected.
Cheers, Dave.Dave has hit the nail on the head, well the second Dave anyway.

Dave Ashtrans is Dave from Ashcroft Transmissions, a long time member of the forum and very helpful with any information he can provide. So personally I don't think it's out of order for us to help him out with readily available information. He's not asking for material specs or engineering drawings after all.

Diana

[uninformed]

Material specs were never hidden by Mal. Ashtrans may have been asked by a customer or friend to source and install a pair.

Ashtrans themselves made lower low range gear sets, via a different method to MD. They were available for a short time, but withdrawn for reasons I will let Dave explain if he wishes (I may not have the facts right and dont want to get it wrong)

If we are going to take Ashtrans to task over copyrights, we should have ages ago when their new HD driveflanges came out and looked very similar to the MD, colour and all :p

[LowRanger]

And maybe Dave is looking at expanding his market and offering an alternative;)
And competition can only be a good thing :D

[Slunnie]

The man just asked a simple question, nothing more than what every 49% customer probably has asked. I think we are being a little (big) bit anal about this.

[Lotz-A-Landies]

Have to agree with Slunnie, a simple question but some comments are getting borderline.

Copyright has little to do in this situation, its Patents law, more than that if there is a problem, it is not an issue of ours, it is a commercial issue between Aschroft Transmissions, Maxidrive and the licensee MR automotive if it exists at all.

AFAIK, Ashcroft's have done several runs of underdrives, so it may not be a problem at all, merely the cost of production for a slow moving assembly.

[uninformed]

talk about blowing something out of proportion (insert rolling eyes)

[ashtrans]

Dave, forgive me if I am wrong, but isn't MR/MAXI your competitor?
Not quite kosher doing market research on their products through the forum, I would have thought:(
I am, of course, open to being corrected.
Cheers, Dave.

Hi Dave,

not at all, Warren at MR Automotive has bought some products from us and I am looking at buying a low range set from him for a customer of mine,

it's no more complicated than that !!

thanks for the replies, I will let the customer know to expect some additional noise,

thanks again

Dave

[slug_burner]

The man just asked a simple question, nothing more than what every 49% customer probably has asked. I think we are being a little (big) bit anal about this.

X2 what he ^ said.

[Bush65]

John, Im not 100% but I dont think there ever was a 40% reduction set. Just the 30% first and then MD added the 49%.

Ill see what I can dig up.

Dave, do you want me to make a sound recording and email it to you?

cheers
Serg
I was going by a document from Maxi-drive (as I stated and gave a reference to in my post. Part of the document made into a jpeg is attached below. According to this the 40% reduction has 24T x 71T, so what are the tooth counts for the 49% reduction?

BTW I doubt 40% was a typo, as the maths check out. For 49% reduction the overall ratio would need to be approximately 1.49 x 3.3 = 4.92

[uninformed]

Thanks John,

I missed the part where you said you got the info from a MD document. :angel: In all my MD literature I can only find 1 reference to the 40% low, that, on the bottom of a 30% low info page. All it says is "40% improvement is also available on request but does require machining of the transfer case."

I also have a hand written doc from Mal showing tooth count.

Original: 19/40 = 2.10
30%: 20/55 = 2.75
49% 23/72 = 3.13

primary reduction 26/41 = 1.58

Total T/Case
Original 3.32
30% 4.34
49% 4.94

some other info: 30% gear is 181mm dia, the 49% gear is 184mm dia. And again I think you are correct in your statement re a smaller tooth for the larger reduction.

[rick130]

I was going by a document from Maxi-drive (as I stated and gave a reference to in my post. Part of the document made into a jpeg is attached below. According to this the 40% reduction has 24T x 71T, so what are the tooth counts for the 49% reduction?

BTW I doubt 40% was a typo, as the maths check out. For 49% reduction the final stage ratio would need to be approximately 1.49 x 3.3 = 4.92


Thanks John,

I missed the part where you said you got the info from a MD document. :angel: In all my MD literature I can only find 1 reference to the 40% low, that, on the bottom of a 30% low info page. All it says is "40% improvement is also available on request but does require machining of the transfer case."

I also have a hand written doc from Mal showing tooth count.

Original: 19/40 = 2.10
30%: 20/55 = 2.75
49% 23/72 = 3.13

primary reduction 26/41 = 1.58

Total T/Case
Original 3.32
30% 4.34
49% 4.94

some other info: 30% gear is 181mm dia, the 49% gear is 184mm dia. And again I think you are correct in your statement re a smaller tooth for the larger reduction.


Just found the same sheet John has and pretty sure I posted it up amongst all the tooth counts a while back as a scan in the 'files' section on here.

It's amongst a catalogue of stuff Paula sent me with the first set of axles and d/flanges in '02.