Do you mind telling me more about this? I've heard this mentioned before but don't know anything more than it was changed on later production cars...
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- Thread starter DarrenM
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Do you mind telling me more about this? I've heard this mentioned before but don't know anything more than it was changed on later production cars...
SeanDezart
Well-Known Forum User
Alphabettispaghetti
Club Member
Ask Franky - he knows all.
I'm off to bed - nearly 1am here !
Not quite fair or correct sean. I'm not the one saying its the worse car in the range. I'd appreciate you imparting your thoughts and knowledge here. Seems Woody would also.
Woody, the Rear diff was moved slightly to give a 'better' angle on the drive shafts, to fix a problem that was often reported, not always though of vibration.
Albrecht
Well-Known Forum User
If I may...
Original Diff position resulted in the driveshafts being angled back towards the hub companion flanges. The reasons for the Diff being located where it was were complicated, but it involved considerations in the original prototyping for a larger fuel tank and allowances for rear crash testing.
Later in production the opportunity was taken to move the Diff back slightly, giving a more 'ideal' driveshaft installed angle. Some people say this results in a quieter and smoother driveline, but if your driveshafts are in good working condition there's probably little noticeable difference.
This factory graphic saves a thousand words:
If I may...
Original Diff position resulted in the driveshafts being angled back towards the hub companion flanges. The reasons for the Diff being located where it was were complicated, but it involved considerations in the original prototyping for a larger fuel tank and allowances for rear crash testing.
Later in production the opportunity was taken to move the Diff back slightly, giving a more 'ideal' driveshaft installed angle. Some people say this results in a quieter and smoother driveline, but if your driveshafts are in good working condition there's probably little noticeable difference.
This factory graphic saves a thousand words:
Thanks Alan, really insightful as always! A picture really does say a thousand words in this instance
SeanDezart
Well-Known Forum User
For a stock road car - start pushing more torque through them and one reasons why Nissan improved them. The early competition (rally at least) cars all had diff problems (overheating) f not broken. Related problem ?
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Albrecht
Well-Known Forum User
In a word, no.
SeanDezart
Well-Known Forum User
Ok - so what did Nissan change/improve to avoid the problem recurring please ?
Albrecht
Well-Known Forum User
They connected the diff coolers back up again.
SeanDezart
Well-Known Forum User
Why were they disconnected ?
Albrecht
Well-Known Forum User
Because they thought - mistakenly as it turned out - that the low ambient temperatures of the November/December 1970 British weather would mean they didn't need them.
They would probably have been right, but the Loctite on the crownwheel bolts gave up the ghost...
SeanDezart
Well-Known Forum User
Thanks - was there an expected problem for the diffs to ran 'too cold' then ?
Did the Monté cars have the same problems (as the RACs) in the cold, snowy conditions ?
Did the Monté cars have the same problems (as the RACs) in the cold, snowy conditions ?
Albrecht
Well-Known Forum User
The questions just keep on coming, don't they?
No problems expected for diffs "running cold". Just a decision to disconnect the coolers to eliminate a layer of complication/possible damage that might not be necessary. As it turned out, that had its own consequences.
The problem didn't repeat itself on the Monte.