Help Needed - No Drive

[CookieMonster]

whilst out playing on monday i lost all drive. There was a clunking noise, like something was slipping, occasionally i would get drive, but would soon loose it again, whilst still in gear. We took off front hub caps and took off front prop thinking i had blown my front diff, put it in diff lock then tried driving and i still had nothing, no drive at all. It goes in gear spot on still, and the clutch was only done about 3 month ago, 3000 miles on it maybe less now.

I think it may be my transfer box, or centre diff, poss something in the rear axle.

Anyone have any ideas??? seriously stuck for whats wrong with it.

[AbyssDJ]

if its still not going anywhere in diff lock then its got to be something before that... does it refuse to go in any gear? tried it in both high and low range?

edit - that could of course include the center diff itself by the way

[L90OOK]

Take the pto cover off your transfer box & have a look at the output  shaft of your g/box...my guess is the output shaft splines of your g/box have shredded. :?

[extreme90]

ill 2nd L90OOK
but also make sure that it is actualy in gear on the t/box and isnt jumping out, as that would clunk and grind

either you've been real unlucky and popped 2 diffs in 1 hit which i doubt

or somethings amiss in the transfer box

drain the oil off and see what comes out

if you dont no where the pto cover is, its located to the side of the handbreak drum, and is round in shape with 6 ( afink) bolts holding it on, when you remove make sure you've got some rag to mop the oil up that wil dribble out

dan

[CookieMonster]

doesnt refuse to go in any gear, high or low.

I'm beginning to think its my main shaft splines worn, which would mean a rebuild or new box, and transfer box.

Its the R380 box of reverse is under 5th isnt it???

[extreme90]

its a R380  :shock:
drain the oil off the transfer box and see what comes out,
always thought they cured the mainshaft ware for the R380 and that its only the lt77 that suffered

dan

[L90OOK]

It was the transfer box that caused the wear as the input shaft starved the gearbox output shaft of oil.  Therefore this caused fretting corrosion & wear on the gearbox output shaft splines & eventually total loss of drive.
The solution was a cross drilled input shaft in the tranfer box allowing oil to flow around the gearbox output shaft splines.
I think early R380 setups still suffered with this wear & ofcourse any highbrid not having this mod will suffer too.
Was there allot of backash/clunking when changing gear/on & off the power before it lost drive?
The only way to check is to remove the pto cover & have a good look, or split the gearbox & transfer box. :?

[Big Watty]

Check the drive flanges and half shaft end at the wheel

[ian_s]

did you try it in difflock with the front axle still connected?
from what you said at first, it seems that you disconnected the front axle before testing owt. it could be just the rear axle thats gone
check and see which propshafts turn when you try and drive forward

[CookieMonster]

right, took the pto cover off and put it in drive, main shaft turned and engaged transfer cog, so its not that.

Took off the transfer box sump and it was full of metal swarf so i thought i had mashed the transfer box, nope, that looks ok.

So, looked at centre diff as best i could, yes, sheared teeth off it, so new centre diff it is, and a transfer box to make sure, dont know what damage the metal swarf has done in there.