Wizard
As most of us know (or at least have peripheral understanding), in the Puma we've got the Getrag MT82 gearbox mated with the standard LT 230 transfer case that's been fitted to Defenders since the year dot.
While not perfect, the LT230 is a good old unit and the input shaft will most probably last the life of the car (with the occasional seal replacement). However marrying the transfer case to the gearbox is a different issue. The old Leyland unit (LT77) and the Rover unit (R380) had their minor issues, but are pretty solid. The MT82 has however had a few issues, but pretty easy to fix if costly and annoying.
The main issue being the adapter shaft between the LT230 and the MT82. Looking at the shaft you can see Leyland's truck style engineering on the one end and German road going tech on the MT82 side and very apparent limited R&D by a cash strapped LRJ during the Ford years.
For some unfathomable reason Land Rover believed that multiple spline gearing would be able to operate and survive running completely dry (no lubrication what so ever) and totally disregarded the phenomenon of gear "fretting"! The attached pictures shows the condition of my 90's shaft after 5 years and 70,000km. Lots of surface rust and some pretty significant wear on the shaft splines (both on the shaft and the female/ female adapter joining it to the gearbox). While still in one piece, the prognoses was a maximum of 20,000km before total failure which pretty much means total loss of drive.
My car now has the Ashcroft modified MT82 adapter shaft fitted and the gearbox oil freely flows into the joint and time will tell if this is the permanent fix for this now known issue. Southern Land Rover in Perth who fitted it is so impressed that they've already advised 2 other clients that this would be their recommendation outside warranty!
Ashcroft Transmissions
At $650.00 landed in Perth, the kit is half the price Land Rover would charge you over the counter for TUD500020 and LR030054, so well worth considering.
Cheers,
Lou
Master
SupporterHi Lou,
How does she drive with the new shaft? Any noticeable change to the usual backlash klunks & klanks? etc. I would have thought that additional wear (now eliminated) would certainly contribute to making it worse.
Does the gearbox adaptor come with the kit too?
MY13 Defender 90 LE "George"
Wizard
Hi Lagerfan,
The 90 drives better than it ever did...
The 3 piece kit is the 2 modified OEM parts - female/ female gearbox adapter and the shaft) as well as the aluminium seal "cup" that replaces the plastic cage thingy inside and which forms the new output shaft seal with an OEM shaft seal and the double o-ring on the female/ female coupling. See Ashcroft's zoom pictures. THe shaft has been machines further back to allow the new seal.
You also get the special "spanner" to tighten the aluminium bit to the coupling.
Land Rover replaced the spacer shims and washers in the transfer case while it was all out. Difficult to know the exact item of improvement, but Pat here on the forum reported significant improvement with just am OEM shaft replacement.
Cheers,
Lou
Fossicker
SupporterHi Lou,
Have just finished reassembling my 130 last weekend after replacing/modifying my adapter shaft .Your old one looks about 50% better than mine did after only 50,000km ,have been worried about reliability of this part for a CSR trip next month. Thanks to many wise contributors on this forum I decided to check/replace the shaft assembly.For anybody that might want to do this (from my experience this adapter shaft will fail at some stage) I used OEM parts and drilled two 1/4" grease nipples 180 deg apart into the flange at the end of the splines. Using a 25mm hole saw drilled a hole in the adapter housing next to weep hole in the base and covered it with a piece of s/steel plate that I cut to fit between ribs and secured with nut and bolt thru housing (the casting might be a bit thin to tap thread there?) With this plate removed , it is easy to see into hole and with both boxes in neutral,align grease nipple and give it a shot of moly grease at every service .
Having already installed max wheel flanges and now the new adapter shaft this Defer is starting to sound a bit more trust worthy!
Tony
OldBushie
I've fitted both axle flanges and replaced the adapter,mines clunk free,in the future I'll go the modded adapter and ATB in place of the center diff and forget about reliability. Pat
OldBushie
Forgot to add,the transit guys have found the Sachs clutch to be the fix to the damper spring issue plaguing earlier vehicles. Pat
Fossicker
SupporterIs this the part that Land Rover failed to install ? A $16 CV boot could eliminate the adapter shaft failure !! I described my grease-nipple addition, only to find a oil leak thru the yoke. This is what I understand Ashcroft has done to lube shaft (did not put any silastic sealer under bolt into g/box) So over Easter the trans case came out again (how I love my Deefer) noticed how much of the grease was been spun out from the shaft. A cv boot from Repco, 25mm x82mm was as close as we could find 80mm would be perfect. Slid boot over end of shaft filled with grease, bashed it in till in place, clamped end of boot with silastic under lip, another shot of grease to nipple.I believe that the grease can now be contained in the boot with no chance of water or dust to get in. Put the lot back together. (see image) Comments please
Tony
Super Moderator
While we're on the MT82 adapter can someone tell me if the female-female adapter (LR030054) is a single piece or is it two parts fitted together in an assembly?
You won't find me on: faceplant; Scipe; Infragam; LumpedIn; ShapCnat or Twitting. I'm just not that interesting.
Super Moderator
Hi LouOriginally Posted by Loubrey
Was talking to a LR workshop today about the MT82 adapter, apparently the adapters were supposed to be mated packed with something like lithium grease. Unfortunately there were a whole batch where this step was omitted in the assembly process and the joint was left dry.
There is apparently a service bulletin on the issue.
Still the Ashcroft modification looks well worth the cost.
Diana
You won't find me on: faceplant; Scipe; Infragam; LumpedIn; ShapCnat or Twitting. I'm just not that interesting.
Fossicker
I've got the bits to do my shaft & was gonna do exactly as Bushmech did, grease nips & hole on the bottom of the case. Then when I saw the boot to trap the grease I thought yea that's even better. One prob. with that of course is that the boot could end up being "full" of grease if it gets too much, then centrifigal force causes the boot to burst. Again not a real prob. just have to grease it more often & so what if the housing has a ring of flung grease in it. There are 4 of those spots from the uni. joints under the truck already.
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