Thread: Gearbox Swap Series III - what to do before reinstalling?

I'd completely strip and inspect it before re-installing, otherwise you'll possibly be pulling it out again.
The jumping out of gear 'may' be due to misalignment but it could easily be something else.
Replace all gaskets and seals and anything else you find.

Lots of other things to check.....
Are the synchro clips intact ?
Are the synchros badly worn ?
Are teeth damaged ?
Are bushes or bearings worn ?
Etc. etc.......

I've only stripped one gearbox to replace synchro clips. In the process I found a bearing that had rusted and wouldn't have lasted long. Plus a gear where the surface was breaking down.
Apparently the previous owner had spent a lot of money getting the gearbox overhauled so the synchros were like new. I did find one chipped tooth but it was minor.

I printed the gearbox overhaul pages from the Haynes manual, laminated them and used them in the workshop while stripping the box.

Isuzu C240 powered Series 3


Colin

And while you're at it you might as well....And for the next few years your Land Rover will be a pile of parts on the floor .
.W.

Originally Posted by gromit

I'd completely strip and inspect it before re-installing, otherwise you'll possibly be pulling it out again.
The jumping out of gear 'may' be due to misalignment but it could easily be something else.
Replace all gaskets and seals and anything else you find.

Lots of other things to check.....
Are the synchro clips intact ?
Are the synchros badly worn ?
Are teeth damaged ?
Are bushes or bearings worn ?
Etc. etc.......

I've only stripped one gearbox to replace synchro clips. In the process I found a bearing that had rusted and wouldn't have lasted long. Plus a gear where the surface was breaking down.
Apparently the previous owner had spent a lot of money getting the gearbox overhauled so the synchros were like new. I did find one chipped tooth but it was minor.

I printed the gearbox overhaul pages from the Haynes manual, laminated them and used them in the workshop while stripping the box.

Isuzu C240 powered Series 3


Colin

Hello Colin,

Thank you for the extensive and informative reply.

I was hoping to avoid deep diving into the bowels of the gearboxes. Both Steam Wally and Geoffrey Crocker have very good YouTube series about working on these gearboxes. See: Land Rover Series 3 Gearbox Overhaul - Part 1 - YouTube for Steam Wally and for Geoffrey Crocker's videos please see Land Rover Restoration Part 2 - Gearbox 1/2 - YouTube

I like your idea of laminating the pages from the workshop manual. If my memory serves me correctly you also had a very good thread on AULRO about working on these boxes too.

From what I have learned from the combination of all these excellent sources, I was just going to throw caution to the wind. Cross my fingers that the replacement gearbox could just have a new gasket or some easy to access seals/bearings installed superficially as preventative maintenance and all would be good. You know, exercise my optimism. Some people manage to get away with stuff like this all the time. Draw on the 'Luck of the Irish'.

Kind regards
Lionel

Originally Posted by B.S.F.

And while you're at it you might as well....And for the next few years your Land Rover will be a pile of parts on the floor .
.W.

Yes B.S.F, you have hit the nail firmly on its head.

Kind regards
Lionel