LR 90 LT77 gearbox oil improvements - Land Rovers Only

Timil · 05-01-2005, 05:11 AM

My 1985 Land Rover 90 n/a has jumped out of reverse since I got it so treated it to a secondhand gearbox this works fine apart from the change from 3rd to 4th slightly notchy and just beating the syncromesh if the change is rushed, if changed with consideration no problem.

Was wondering if anyone has any ideas re one of these new synthetic type wonder oils which seem to improve gearchange etc, or any other ideas re oil one other thing the new gearbox maybe a LT77S and I have just stuck in Comma ATF in it. This gearbox is a major improvement over the old one but has anyone got any ideas to tweak it even more.

TerryS · 05-01-2005, 06:04 AM

While I have an R380 instead of LT77S, The results may likely have been the same. I changed to Synthetic ATF and noticed a marked improvement. The important thing to remember in either box, is exactly what you said, that these boxes hate being rushed.

I recently added about a pint of Lucas gear oil to the box, and again noticed an improvement in changes. Surprisingly, where I also notice an improvement, which I appreciate more, is selecting Reverse, when stopped.

Where, in the Highlands?

whistler110 · 05-04-2005, 12:35 PM

LR is now suggesting synthetic Manual Transmission Lubrcants now instead of ATF. I've been using Redline MTL in my LT77 for awhile now and have been very happy.

Have you dealt with the imput gear on the trransfer case? That is the quickest to wear out point in the driveline.

05-01-2005, 05:11 AM	#1 (permalink)
Timil Member Join Date: May 2005 Location: Highlands of Scotland Posts: 1 Gallery: 0	LR 90 LT77 gearbox oil improvements My 1985 Land Rover 90 n/a has jumped out of reverse since I got it so treated it to a secondhand gearbox this works fine apart from the change from 3rd to 4th slightly notchy and just beating the syncromesh if the change is rushed, if changed with consideration no problem. Was wondering if anyone has any ideas re one of these new synthetic type wonder oils which seem to improve gearchange etc, or any other ideas re oil one other thing the new gearbox maybe a LT77S and I have just stuck in Comma ATF in it. This gearbox is a major improvement over the old one but has anyone got any ideas to tweak it even more.

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05-01-2005, 06:04 AM	#2 (permalink)
TerryS Moderator Join Date: Aug 2004 Location: Bloomfield, CT If I died today, I lived there all my life. Posts: 2,235 Gallery: 0	While I have an R380 instead of LT77S, The results may likely have been the same. I changed to Synthetic ATF and noticed a marked improvement. The important thing to remember in either box, is exactly what you said, that these boxes hate being rushed. I recently added about a pint of Lucas gear oil to the box, and again noticed an improvement in changes. Surprisingly, where I also notice an improvement, which I appreciate more, is selecting Reverse, when stopped. Where, in the Highlands?

05-04-2005, 12:35 PM	#3 (permalink)
whistler110 Member Join Date: Oct 2004 Posts: 28 Gallery: 0	LR is now suggesting synthetic Manual Transmission Lubrcants now instead of ATF. I've been using Redline MTL in my LT77 for awhile now and have been very happy. Have you dealt with the imput gear on the trransfer case? That is the quickest to wear out point in the driveline.

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