Thread: Series Gearbox

Hi.
could someone please explain the difference between this ?

GENUINE LEYLAND REAR MAIN SHAFT BUSH BEARING LAND ROVER SERIES 1948-84 PART 217478 | Land Rover Treasure Shop

and this ?

Mainshaft Rear Bearing Housing Bush for Land Rover Series Gearbox 1948-84 217843 | eBay

New bearing/bush didn't come with full rebuild kit, unless its the same as the main shaft front one in the plastic cage.
Thanks.

whitehillbilly

Should be 217853 according to my parts book - and the difference is that this is standard for the V8, optional for all other models, 217478 being standard - I presume that it is a heavier duty bearing.

Or perhaps they mean 90217843 which is the housing it runs in - the two together are 230696. Further edit. Confirm that - the second one is the bush or housing, 90317843, the first is the roller bearing.

Update.
Gearbox is 1:1 mark on input shaft and rear main shaft gear, mark lines back up after one revolution in 4th gear.
Rear main shaft gear std 27 teeth.
Fitted, nice shiny 31 tooth one.
So other gears in transfer must be different.
Rang Full Boar.. she said they still do kits. Shaft ? Machined to suit ?
Any thoughts ?

whitehillbilly

Gears.
Time to pull off transfer sump cover.
wouldn't changing the Transfer gears Make everything a higher gear ratio ? Including Low range.
Thanks for your comments.

whitehillbilly

I have no experience with changing the transfer case ratio, but there are the following possibilities.

1. If only the input gear is changed, the low ratio is also changed, but importantly, the position of the intermediate gear must be changed. This involves welding and machining on the housing. I believe this is what is normally done.

2. It would be possible to retain the position of the intermediate shaft, but this would require all three constant mesh gears to be replaced. Low ratio may or may not be changed, but if it is not, then the low ratio gear would need to be changed as well, so four new gears would be needed.

Just a note on the jj marks. The gearbox housing and the top gear selector housing are a matched pair. They are machine matched much the same as main crankshaft bearing caps. So the covers are not interchangeable. Thats why the g/box and cover were marked so they were returned to each other.

Thanks for the replies.
More to come soon. Time to drain the oil and remove sump cover.

whitehillbilly

Correct John.
5mm

As per pic.
Intermediate gears.
44 (std 44) 22 (std 25)

High/Low gears
27 (std 31) 36 (std 36)