Classic Autobox

hi wondered if anyone can give me some advice my classic Range Rover is making a clunking noise when I put it in reverse , more noticeable when car has been running for a while .
I have recently had gearbox fluid and filter changed , kicks down fine and no issues changing forward gears
Ta

Prop shaft u/j's, cheapest option to have a look at.

Ok will do thanks if it's not that what would I be looking at next
Ta

Have you checked the atf level?

Could be anything, back lash in the transfer box possibly ie. chain worn, but I am just guessing. Do the cheapest option first.

drakeoo7 said:

hi wondered if anyone can give me some advice my classic Range Rover is making a clunking noise when I put it in reverse , more noticeable when car has been running for a while .
I have recently had gearbox fluid and filter changed , kicks down fine and no issues changing forward gears
Ta

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has it become more noticeable since oil change ?check the rest of the system for backlash ie jacking up a front and rear wheel and rocking props ,its worth pulling rear out put housing off and checking the shaft splines they are prone to wear and rare to find a good one, ftc657 is shaft iits splines in the middle that wear, though some clunking in the auto is not uncommon as box age and takes a full rebuild to cure

Yea checked the atf level it's ok
Ta

jamesmartin said:

has it become more noticeable since oil change ?check the rest of the system for backlash ie jacking up a front and rear wheel and rocking props ,its worth pulling rear out put housing off and checking the shaft splines they are prone to wear and rare to find a good one, ftc657 is shaft iits splines in the middle that wear, though some clunking in the auto is not uncommon as box age and takes a full rebuild to cure

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Initially after oil and filter Change was perfect no noise at all just started recently will check prop shaft
Ta

Does it still clink if you hold it in N for a moment before R? Ibe always found that when they start clonking that adopting that strategy stops the clonk.

Horse_Apple said:

Does it still clink if you hold it in N for a moment before R? Ibe always found that when they start clonking that adopting that strategy stops the clonk.

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Don't know il try it tomorrow
Ta

Horse_Apple said:

Does it still clink if you hold it in N for a moment before R? Ibe always found that when they start clonking that adopting that strategy stops the clonk.

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Tried holding in in N for awhile seemed to reduce clunking noise a bit , will check prop shafts as I'm off this weekend

You don't state the year (or I've missed it) so have you got the LT transfer-box or the later BW?

Sorry year is 1995 to be honest I'm not sure it's a MA chassis. Number if that helps

drakeoo7 said:

Sorry year is 1995 to be honest I'm not sure it's a MA chassis. Number if that helps

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Slide under and have a look at the plate on the t/box.

Ok will do

norseman said:

You don't state the year (or I've missed it) so have you got the LT transfer-box or the later BW?

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Gearbox is a BW Just been underneath

drakeoo7 said:

Gearbox is a BW Just been underneath

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Sorry, can't offer much input then as all my RRC's had the earlier LT, but I know that the BW's chain can stretch with mileage

norseman said:

Sorry, can't offer much input then as all my RRC's had the earlier LT, but I know that the BW's chain can stretch with mileage

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Ok thanks

If waiting in N for a second or two has reduced the clonk then the normal reason is that it is because you've let the engine tickover drop to its rest rate.

Are you running aircon on at the moment? That can have an impact on tickover that makes the clonk appear in summer and go in winter.

In my experience, unless the Rangie is pretty tired and has been abused then the biggest impact on the clonk is a slightly too high tickover.

My 1987 RR clunked when going from D to R when the oil in the transfer box was hot from the day I took delivery, and then for the 10 years I owned it, my 18 year old disco does the same from the day I took delivery... so that's 28 years of clunking, so don't worry about it.
Or fit a Borg Warner transfer box as at the time when 1990MY RR was road test they stated "with the new transfer box the clonk had now gone" so I can only assume that other RRs of a similar year did the same.