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Gearbox Oil - LT77 Box

Gearbox Oil - LT77 Box

Author
Discussion

tonfre

Original Poster:

16 posts

130 months

Saturday 12th May 2007
quotequote all
Hi,
I was looking into checking and topping up my gearbox oil on my 'M' series fitted with a Rover V8 with a LT77 gearbox. The problem is that on doing some research that there are several different oils recommended by different people, including the following:

- Castrol SMX (Fully Synethic)
- Castrol TQF
- EP80
- Dexron III ATF

Does anyone know what is most appropriate for the LT77 Rover gearbox?

Cheers,

Tony.

GTWayne

4,595 posts

122 months

Saturday 12th May 2007
quotequote all
Castrol TQF yes

tonfre

Original Poster:

16 posts

130 months

Sunday 13th May 2007
quotequote all
Thanks for the recommend. I have also been looking round the web and found a number of suggestions for both Redline MTL and Castrol SMX.

I wondered what the difference was and had anyone had any experience of using these oil?

Thanks.
-

ivanhoew

600 posts

146 months

Sunday 13th May 2007
quotequote all
what i was told by a reliable gearbox company ,was that the gearbox is normally run on the thin red stuff to make the gearchange easier ,particularly when cold ,but that this increases wear bearing wize . they recommended runnig a heavier gear type oil to protect the bearings ,and so i run on synthetic 80/90 weight . i dont find it a prob gear change wize. regards robert

p100

541 posts

111 months

Sunday 13th May 2007
quotequote all
Hi Guys, I always use a good quality TQF oil (the red stuff), as the LT77 has an in built oil pump.
If you go to a thicker ep type of oil the pump can over pressurise either blowing the seals or dumping oil from the breather on the top.
Yes, some people do use the thicker oil, but gearchanges can be stiff when cold, and this slows down the synchro`s and bulkrings giving other problems.
The EP oil is normally installed to compensate or hide wear!
Cheers Roy
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njhucker

343 posts

165 months

Sunday 20th May 2007
quotequote all
I use redline mtl in my 350 wedge. Gives nice smooth changes. Got it from demon tweeks, but it is quite expensive

tonfre

Original Poster:

16 posts

130 months

Tuesday 22nd May 2007
quotequote all
Thanks for all the advice and I have also been looking at some old threads on Piston heads. Well I have finally decided to go with Castrol SMX (Fully Synethic). I have ordered some yesterday and will let you know how things go.



Cheers,



Tony.

tonfre

Original Poster:

16 posts

130 months

Friday 1st June 2007
quotequote all
Just to say I have now filled the gearbox with Castrol SMX and completed a short run and all is excellent. Gear change feels better epically in going into first.

Thanks for all your help.
Tony.

Edited by tonfre on Friday 1st June 22:02

SimonV8ster

8,117 posts

133 months

Monday 4th June 2007
quotequote all
These people do a gearbox oil specially for the LT77 box -

Difflock