Scotty
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| posted on 13/9/10 at 06:46 AM |
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LT77 gearchange
hi all
have finally decided to uprate the v8 engine this winter (aiming for 275bhp  )
BUT
have a problem with the gear changing, the cluch seems ok, (will roll backwards on hill in first with clutch in) but is difficult to take out of gear
in first or third, others seem OK
If i change gear slowly, no problems. but if i try for quick gearchanges, it crashes the box all times
any ideas anyone ?
cheers in advance
PLEASE NOTE! All comments made by this person are to be considered "Tongue in Cheek" and are not meant to be taken seriously in any way - so there!
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Agriv8
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| posted on 13/9/10 at 07:05 AM |
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1, the ubbers between the gearchange housing and gear selctor may be worn periched.
2, the gearchange unit is unboltable so take it off and check the movement if free.
3, what oil are you running in the LT77 ? IIRC ATF is recomended as this improves gearchange ( please check ) .
regards
agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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britishtrident
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| posted on 13/9/10 at 07:27 AM |
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Special oil grade for these gearboxes --- MTF94
In earlier years ATF or 10w/40 engine oil was recommended as a stop gap measure until MTF94 was developed specifically for Rover Group to counterr
oil drag and needle roller bearing lubrication problems which were encoutered with originally specified 80 grade GL4 gear oil.
[Edited on 13/9/10 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Scotty
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| posted on 13/9/10 at 12:52 PM |
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thanks for the input. Will check
cheers
PLEASE NOTE! All comments made by this person are to be considered "Tongue in Cheek" and are not meant to be taken seriously in any way - so there!
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wilkingj
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| posted on 13/9/10 at 01:59 PM |
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Do NOT use any thick type gear oil in an LT77 box ie EP75/80/90.
Most LT77's are reccomended to run on ATF. Whilst this sounds a bit daft, its not. There is an internal oil pump in LT77gearboxes and it needs
the thinner ATF to work successfully.
I dont know what the MTF 94 is, so cant comment. However I ran my Landy for 13 years with ATF in the LT77 box and did over 100,000 miles on it, and it
was still going well when I sold it. My mate who bought it has been running it for the last 3 years, without problem, but I dont know how many miles
he has done since, probably at least another 20K as its his daily driver too.
(I Would need to get the manual out to give the exact Spec of the ATF)
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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britishtrident
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| posted on 13/9/10 at 03:55 PM |
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MTF94 was developed for these boxes it is essentially an ATF without the friction additive.
The friction additive is the same stuff used to in LSD oil --- really not something you want in an oil if you don't need it.
10w/40 engine oil was specified before that but it is a a little short of EP additive.
Rover found MTF 94 made such an improvement they started using it in the front wheel drive transmissions.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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scudderfish
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| posted on 13/9/10 at 04:08 PM |
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A lubricant with a friction additive.......
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britishtrident
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| posted on 13/9/10 at 08:09 PM |
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quote:
Originally posted by scudderfish
A lubricant with a friction additive.......
Friction modifier additive as required by LSDs, with plate type LSDs the ammount of friction modifer added to the oil alters the slip-grip
breakaway characteristic of the diff in more formal terms the relationship between static and sliding friction.
Tradditional automatics to the classic pattern originally developed by Borg Warner are planetary transmissions the brake bands that select the ratios
also work on friction.
In the 1960s and 1970s when the Borg Warner 35/45/65 box was used by many manufacturers. The gear change characteristic of these autoboxes could be
altered by the ammount of friction additive in the transmission fluid. Manufacturers had the choice of specifying a choice between TQF (using
Castrol grade designation) or TQA. TQF was used by Ford, BL and Triumph and gave a more sporty ratio change. TQA was used by Rootes, Rover and
Jaguar and gave a smoother more slurred gear ratio change.
[Edited on 13/9/10 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Scotty
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| posted on 14/9/10 at 06:49 AM |
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wow!
nice one chaps
better dig out the oil to see what we used
thanks again
PLEASE NOTE! All comments made by this person are to be considered "Tongue in Cheek" and are not meant to be taken seriously in any way - so there!
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Agriv8
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| posted on 14/9/10 at 10:28 AM |
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Amazing what you can learn on here - cheers for that Britishtrident .
I know we used ATF on the V8 off road buggy but that wold be chaged evey 3 or 4 meets due to contamination so used ATF as it relativley was cheep to
replace
regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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