darrens
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| posted on 1/8/07 at 08:23 AM |
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LT77 Oil
Hello,
Gonna change the oil in the gearbox this wknd, I heard redline is recommended, which variant? or auto trans oil.
Anyone prefer other.
Cheers
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Fatboy Dave
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| posted on 1/8/07 at 09:59 AM |
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I use redline synthetic 75w90.
Use any form of ATF and I will carve my name on your forehead with an ice pick 
Dave
Stop the planet, I want to get off
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britishtrident
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| posted on 1/8/07 at 10:23 AM |
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You must NEVER use normal gear oil in these boxes it makes changing gear from a cold start on a winters morning a Charles Atlas job
Rover have change the recomedation a couple of times but ATF is correct, the alternative being the slightly thicker Xpart MTF94.
Both these oils are a lot "thinner" than conventional gear oils.
Gear oils intended for transverse gearboxes although thinner than normal gear oils are considered thicker than ATF or MTF94.
Info below taken from Land-Rover Defender handbook
[Edited on 1/8/07 by britishtrident]
 
Rescued attachment oil_capacities.gif
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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mark chandler
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| posted on 1/8/07 at 11:03 AM |
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To confirm above, you must never use hypoid oil in these, they have a pump so use thinner oil.
For myself I found a fully synthetic oil easied the changes but made the gearbox feel notchy if that makes sense so went back to ATF.
Regards Mark
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darrens
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| posted on 1/8/07 at 11:54 AM |
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rate then just to confirm, mark n britishtrident go with AFT, but if I do Fat Boy dave is gonna carve HIS name in MY forehead with an ICE PICK.
doesn't sound terribly appealling somehow!!
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craig1410
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| posted on 1/8/07 at 12:31 PM |
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FWIW, I'd agree with using ATF in the LT77 although I understand you can use SAE75 gear oil at a push. If you do then the box is likely to be a
bit stiff when cold but will be okay once it's warmed up.
I'm going with ATF and will just change it every 2 years.
Cheers,
Craig.
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coozer
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| posted on 1/8/07 at 01:13 PM |
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According to my manual it uses red steering fluid.
1972 V8 Jago
1980 Z750
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DarrenW
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| posted on 1/8/07 at 01:28 PM |
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ATF or Land Rovers own MTF94
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Fatboy Dave
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| posted on 1/8/07 at 09:07 PM |
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ATF is NOT a gearbox oil, it's an extreme pressure hydraulic fluid. Yes, the change is heavy from cold with a hypoid gear oil, but so what
compared to a knackered box?
Rover originally designed the LT box to be used with a 75w oil (so no worries about the pump), but little old dears in their V8 Vitesses were
complaining of a heavy shift. Rover changed the recommendadtion to ATF, and SKF immediately withdrew their bearing warranties and Rover dealers were
told to cover any failures that were brought in under warranty.
Ever since then, ATF has been the recommended choice by Rover.
Dave
Stop the planet, I want to get off
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craig1410
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| posted on 1/8/07 at 10:43 PM |
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Try this EVOLUTION 1 stuff. LINKY
[Edited on 1/8/2007 by craig1410]
[Edited on 1/8/2007 by craig1410]
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britishtrident
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| posted on 2/8/07 at 06:55 AM |
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It was actually horny handed LR 90 & 110 owners who were complaining about being unable to find second gear in cold weather, which is not good if
you have a 2 ton plant trailer hitched on the back. The problem wasn't just that the the EP oil prevented the synchromesh from working but it
was also causing oil starvation and overheating of the needle roller bearings in main shaft.
Rover Powertrain did a lot of modifications to the lubrication system on the gearbox.
EP Hypoid gear oils to gL5 are not intended for gear boxes they are intended for hypoid axles, they contain large ammounts of EP additives.
Large % of EP additives is not good for synchromesh gearboxes.
GL4 gear oils contain much less EP additive and are intended for gearboxes.
After having problems with gear oil Rover initially tried switching 10w/40 engine (as specified for many other RWD gear boxes) this was a major
improvement but engine oil contains little or no EP additive.
Seeking further improvement they switched to AFT (which is roughly the same viscocity as a 5w/30 engine oil) .
Autotransmision is not just straight hydraulic hydraulic oil, it contains EP additives, friction additives, detergents and ant-varnish agents and
anti-foaming agents and VI improvers.
Friction additives are not needed so MTF94 (Manual Tranmission Fluid 1994) was developed specially for Rover applications MTF94 is slightly thicker
than ATF and contains no friction additives.
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craig1410
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| posted on 2/8/07 at 07:49 AM |
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quote:
Originally posted by britishtrident
MTF94 (Manual Tranmission Fluid 1994) was developed specially for Rover applications MTF94 is slightly thicker than ATF and contains no friction
additives.
The Evolution 1 stuff in my link above seems to be the successor to something called MT75D which was developed to address all of the issues you talk
about in your post. Looks like a good bet from what I've read.
Cheers,
Craig.
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britishtrident
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| posted on 2/8/07 at 10:46 AM |
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Some of the Land-rover mob use MTX oil as speced FWD Fords it is slightly thicker than either ATF or MTF94.
With the MG/Rover PG1 tranverse boxes (which are related to the LT77/R380) I always have used ATF without problem.
One thing my Land-Rover mate told me was is pays to change the oil on a LT77 or R380 every year.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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craig1410
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| posted on 2/8/07 at 11:08 AM |
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quote:
Originally posted by britishtrident
One thing my Land-Rover mate told me was is pays to change the oil on a LT77 or R380 every year.
The nice thing about the Evolution 1 stuff is that being synthetic it only needs to be changed every 48000 miles which on a kit car is probably the
lifetime of the car. The manufacturer actually says it will last longer than this but they had to draw the line somewhere...
Yes, the consensus seems to be that ATF should be changed every year.
Cheers,
Craig
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Fatboy Dave
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| posted on 2/8/07 at 12:37 PM |
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quote:
With the MG/Rover PG1 tranverse boxes (which are related to the LT77/R380) I always have used ATF without problem.
OK, I'm gonna stop you there as that's the second piece of bad info from you.
Firstly, it wasn't 90/110 owners complaining of heavy shiftf. The LT77 didn't make it into the green oval until the launch of the 90/110
until 1984 (in '83, all you could get was a V8 with the LT95, and the 2.25 with a part time transfer box - only a handfull sold).
The problems with the LT77 date back to 1976/1977 with the launch of the SD1 3500. Traditional Rover customers (i.e. little old men and women)
couldn't change gear from cold, hence the change to ATF. Land Rover have always advised ATF for their boxes, and the LT has been built from the
late 70s with better bearings than the original Timkens that will run in ATF
As for the PG1, nothing at all is related to this box. The PG1 is a box designed by Honda for 1600cc. The LT was designed by Triumph.
Dave
Stop the planet, I want to get off
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