LT95 rebuilt, now noisy...

**Shingleback** · 4th August 2016, 09:05 PM

Long story short, my LT95 was fine to use but did have a bad oil leak out the output onto the handbrake. The box had to come out anyway to fit the new clutch, so I told the mechanic to have a good look and freshen up if needed. There was a bit of slop in the stick, the oil leak, but otherwise drove fine. The box was stripped and "rebuilt". when I picked it up he had a semi synthetic oil in it to run it in, had to take back after 1000km to drain and fill with normal mineral oil. It drove fine with the semi synthetic but was ridiculously noisy, especially in 4th with the mineral oil.

Before the rebuild I just ran the same oil as the engine and it was fine, what's the go?

I told the mechanic and he came to my house, quick test drive, and swapped the oil back to the semi synthetic and it was good again. He took an oil sample to get tested but haven't heard back yet. He had no answers.

Should I be concerned? Is annoying how it is was quite before the rebuild.

And driving it more, even with the semi synthetic oil I reckon it's still noisier than it used to be, especially in 4th gear low range. Wondering if I should try fully synthetic?

And finally, is it necessary to remove the whole front floor and transmission tunnel to remove the gearbox? Annoyed me cos of all the dynamat and waterproofing I'd done.

Attached photo of the gearbox bits replaced.

Cheers,
Andrew.

**350RRC** · 5th August 2016, 07:31 AM

This is an amusing quote from the Haynes manual at the end of the chapter that details rebuilding a LT95:

?Note: It is sometimes difficult to decide whether it is worthwhile removing and dismantling the gearbox for a fault which may be nothing more than a minor irritant. Gearboxes which howl, or where the syncromesh is worn but double declutching can overcome the problem, may continue to perform for a long time in this stage A worn gearbox usually needs a complete rebuild to eliminate noise because the various gears, if re-aligned on new bearings, will continue to howl when different wearing surfaces are presented to each other.
The decision to overhaul therefore, must be considered with regard to time and money available, relative to the degree of noise or malfunction that the driver can tolerate.?

I find it amusing because it really should be at the start.

DL

**101RRS** · 5th August 2016, 12:23 PM

Put the proper mineral engine oil in it and see what happens. Plenty of people have played around with newer oils and paid the price with gearbox problems.

**rfurzer** · 5th August 2016, 01:38 PM

This wisdom should also be a cornerstone of the medical profession!

Originally Posted by 350RRC

This is an amusing quote from the Haynes manual at the end of the chapter that details rebuilding a LT95:

?Note: It is sometimes difficult to decide whether it is worthwhile removing and dismantling the gearbox for a fault which may be nothing more than a minor irritant. Gearboxes which howl, or where the syncromesh is worn but double declutching can overcome the problem, may continue to perform for a long time in this stage A worn gearbox usually needs a complete rebuild to eliminate noise because the various gears, if re-aligned on new bearings, will continue to howl when different wearing surfaces are presented to each other.
The decision to overhaul therefore, must be considered with regard to time and money available, relative to the degree of noise or malfunction that the driver can tolerate.?

I find it amusing because it really should be at the start.

DL

**Shingleback** · 5th August 2016, 09:54 PM

Originally Posted by garrycol

Put the proper mineral engine oil in it and see what happens. Plenty of people have played around with newer oils and paid the price with gearbox problems.

Done that. It was proper mineral engine oil that was put in by the mechanic after the 1000k run in. that's when I noticed the very loud howling in 4th.

I only ever ran shell rimula 15w 40 and was fine before the rebuild. The mechanic used penrite oils, wouldn't have thought that it would be too different.

**steveG** · 6th August 2016, 06:56 PM

In 4th the main box is straight through, so I wouldn't expect you'd be getting any gear noise from that. Possibly points to the transfer case. It's been ages since I've been inside one but wonder if there's a gear that can be installed either way around, so now it's being driven on what used to be its overrun side.
Other thought was is it something as simple as a box to chassis touch point transferring noise.

Steve

**350RRC** · 8th August 2016, 06:58 PM

Originally Posted by steveG

In 4th the main box is straight through, so I wouldn't expect you'd be getting any gear noise from that. Possibly points to the transfer case. It's been ages since I've been inside one but wonder if there's a gear that can be installed either way around, so now it's being driven on what used to be its overrun side.
Other thought was is it something as simple as a box to chassis touch point transferring noise.

Steve

Or any of the myriad handbrake linkage parts vibrating.

The noisiest thing in my POS at 100 km/h is actually the bloody button vibrating in the end of the handbrake handle.

DL

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LT95 rebuilt, now noisy...

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LT95 rebuilt, now noisy...

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