Hi Newbie saying....erm...hi.....

[Xpuffin]

Firstly hello all, I'm the happy owner of a Rover 260 and I'm loving the lazy drive the old girl has to offer. It's just magic.
Sadly, having only had her for a few months I have a check engine amber light on and a slippy gearbox (wether the two are related is the question) I'm based near Basingstoke and was hoping someone could recommend someone who could help. I've tried a guy in Cobham who didn't really want to know when I mentioned a gearbox issue. Also is there a code reader on the market for our cars as it could just need reading and clearing.
Hope to meet a few of you this year at any meets planned.

cheers
Jez

[David]

There was a bit of chat about code readers a few days ago in this thread:
https://www.two-sixties.co.uk/mgoc260/html/f0rum/showthread.php?16745-Inlet-manifold&p=177026#post177026

David

[Malcolmr]

Welcome to the forum, Jez.

[re-tread]

Welcome to the forum Jez.

[Jez Marsh]

Welcome, what are the last 3 vin numbers on your car?
Good luck with the box.

[David]

Assume you've checked the auto-box fluid-level and colour, Jez? Mark you, you shouldn't see any drop in level unless something else has happened. Should still be nice Mercon-V red, not brown.
... oh yes, sorry; welcome on board from Holland!

David

[Nich]

Welcome along Jez. You might get some more information if you returned your questionnaire to Tim to get full access to the site, lots of information for you.

Nich.

[Morganman]

.....and welcome from Germany.

André

[Xpuffin]

Assume you've checked the auto-box fluid-level and colour, Jez? Mark you, you shouldn't see any drop in level unless something else has happened. Should still be nice Mercon-V red, not brown.
... oh yes, sorry; welcome on board from Holland!

David
Hi David.
first thing I did when I bought the car was take it to a garage I use for some of my other stuff for a full service, and as the gearbox was feeling a little tardy, a gearbox oil change. The oil they used was Motol Multi ATF (Dextron 3+) which was recommended as an alternative to the Mercon V. Within 500 miles the gearbox has an intermittent slip (once every couple of days) bad enough that I've stopped driving it and coincident with the check engine light. Wether this is because of the oil I don't know but the garage owner(who I trust) says the Motol rep insists it's compatible and it certainly lists Merton V on the compatibility sheet.
Cant find out much about the gearbox type or wether taking it to a Mustang specialist would be better as no one seems to be able to recommend anyone capable of working on the Rover 260 with the auto box.

[David]

mmmmmh. I would certainly suspect the fluid you used. How did they change it? Drop the pan as they should? How many litres did they charge you for?
The box takes 12l. from dry, max 8l wet (but normally you are lucky to get more than 6 or 7 out). Mercon-V really is the oil to use. That means a lot of Mercon-V has been retained, mostly in the torque convertor, and mixed with your stuff.

Rather than look for a Mustang specialist for your Rover 75 V8, why not go to a Rover 75 V8 /ZT-260 specialist; seems logical to me?

P.S. I did recommend a specialist very able to work on the R75V8 in a PM to you. Take a look?

David

[Xpuffin]

mmmmmh. I would certainly suspect the fluid you used. How did they change it? Drop the pan as they should? How many litres did they charge you for?
The box takes 12l. from dry, max 8l wet (but normally you are lucky to get more than 6 or 7 out). Mercon-V really is the oil to use. That means a lot of Mercon-V has been retained, mostly in the torque convertor, and mixed with your stuff.

Rather than look for a Mustang specialist for your Rover 75 V8, why not go to a Rover 75 V8 /ZT-260 specialist; seems logical to me?

P.S. I did recommend a specialist very able to work on the R75V8 in a PM to you. Take a look?

David
Hi David
Thanks for the recommendation, I shall contact them. Re the oil change they put in 12l using a recirculating transmission oil changer

[Nich]

..............Cant find out much about the gearbox type or wether taking it to a Mustang specialist would be better as no one seems to be able to recommend anyone capable of working on the Rover 260 with the auto box.

As David says you would probably be better looking for a R75 V8 specialist. If you put your location in your profile it will help to identify specialists near to your location.

The auto box is a Ford 4r70w from memory.

Get your questionnaire back to Tim to get full membership, lots of info on the site.

Nich.

[David]

As David says you would probably be better looking for a R75 V8 specialist. If you put your location in your profile it will help to identify specialists near to your location.

The auto box is a Ford 4r70w from memory.

Get your questionnaire back to Tim to get full membership, lots of info on the site.

Nich.
Almost 100% certain its a 4R75W as used in the 2003 Mach-1, Nich. Not that its relevant to the problem! Whether it is a 4R75W or 4R70W, it MUST have Mercon-V, not any Dexron or normal Mercon even, else it WILL fail and very quickly, according to the American mustang "gods" on the forums. Worse still it would appear that all 12l of the proper fluid has been removed by changing the fluid in the wrong way.

David

[David]

I guess may be best to have the whole lot changed for Motorcraft Mercon-V in the same way and HOPE it does it. I am in no way qualified to say that though, just thinking out loud. Consulting Brian (scooter) may be a good starting point? Do not drive it would appear sensible for now!

Edit: There-after sue your garage!

David

[Nich]

A post from 3 years ago:


Isn't the autobox the 4r70w? If so you must use Mercon V, Dextron III is not a substitute for Mercon V but _IS_ for Mercon, using it will cause your box to fail.

I have a 4r70w in my New Edge Mustang and went through this pain. Interestingly my stang is supercharged and the 4r70w holds up like a champ many owners saying they are stronger than the manuals. Did I read on here that the R75 couldn't be charged due to gearbox weakness?

[SCP440]

I have a freiend in Oxfordshire who specalises in Auto gearboxes, if there is a problem he will know what the issue is and can probably come up with a solution.

Let me know if you want me to put you in contact with him.

Steve

[David]

Looking on various forums, it would appear that Mercon V contains a special "friction modifier" which is necessary to allow the special friction clutch material to function properly in our boxes (4R70W or 4R75W). The slippage mentioned could well tie in with that description of what the 'V' does that Dexron or normal Mercon does not?

David

[Xpuffin]

Welcome along Jez. You might get some more information if you returned your questionnaire to Tim to get full access to the site, lots of information for you.

Nich.
I have sent an email to Tim requesting the questionnaire but as yet have had no reply.