Discussion
Hi all,
I'm looking to buy a Tuscan. Tried a wonderful Mk3 earlier in the week.
But was surprised to hear some 'diff backlash' on so late a car (Sept 2006).
1. Is this normal: i.e. the soft, occasional clunk.
2. Do the earlier Mk1's have the same characteristic?
I'm looking to buy a Tuscan. Tried a wonderful Mk3 earlier in the week.
But was surprised to hear some 'diff backlash' on so late a car (Sept 2006).
1. Is this normal: i.e. the soft, occasional clunk.
2. Do the earlier Mk1's have the same characteristic?
Edited by oleander on Friday 11th September 14:15
The Convertible and MK3s used the newer Dana Spicer M80 diff with a 3:46 ratio , because of the shunt , I changed within 2 years to the older M78 with 3:73 ratio and its perfect even now with a 4.5 Super Sport from Powers.Although in the Spec. TVR never supplied any Close Ratio gearboxes even on "S"s
Reading through the Holden and GTO forums, it appears the m80 build quality wasn't the best, however rebuilds overcame any issues.
It wouldn't surprise me if the issue with the m80 in TVR's was, they used quite a long nosed 6 bolt cv pinion flange, followed by a 4-bolt prop shaft adapter. That flange was fine for a two-piece drive shaft running a centre bearing and a cv joint at the diff, but a one piece with a uj would be putting immense strain on the pinion bearing causing potential premature failure.
It wouldn't surprise me if the issue with the m80 in TVR's was, they used quite a long nosed 6 bolt cv pinion flange, followed by a 4-bolt prop shaft adapter. That flange was fine for a two-piece drive shaft running a centre bearing and a cv joint at the diff, but a one piece with a uj would be putting immense strain on the pinion bearing causing potential premature failure.
Edited by v8sag on Monday 14th September 22:43
v8sag said:
Reading through the Holden and GTO forums, it appears the m80 build quality wasn't the best, however rebuilds overcame any issues.
It wouldn't surprise me if the issue with the m80 in TVR's was, they used quite a long nosed 6 bolt cv pinion flange, followed by a 4-bolt prop shaft adapter. That flange was fine for a two-piece drive shaft running a centre bearing and a cv joint at the diff, but a one piece with a uj would be putting immense strain on the pinion bearing causing potential premature failure.
No .. The TVR prop shaft was different with the M80 3 bolt flange , I had to get a new propshaft aswell when I went to the 4 bolt flange M78.It wouldn't surprise me if the issue with the m80 in TVR's was, they used quite a long nosed 6 bolt cv pinion flange, followed by a 4-bolt prop shaft adapter. That flange was fine for a two-piece drive shaft running a centre bearing and a cv joint at the diff, but a one piece with a uj would be putting immense strain on the pinion bearing causing potential premature failure.
Edited by v8sag on Monday 14th September 22:43
If a customer complained , the factories way of fixing the problem with M80s was to revert to the M78s
.Edited by The Three D Mucketeer on Tuesday 15th September 12:34
The Three D Mucketeer said:
v8sag said:
Reading through the Holden and GTO forums, it appears the m80 build quality wasn't the best, however rebuilds overcame any issues.
It wouldn't surprise me if the issue with the m80 in TVR's was, they used quite a long nosed 6 bolt cv pinion flange, followed by a 4-bolt prop shaft adapter. That flange was fine for a two-piece drive shaft running a centre bearing and a cv joint at the diff, but a one piece with a uj would be putting immense strain on the pinion bearing causing potential premature failure.
No .. The TVR prop shaft was different with the M80 3 bolt flange , I had to get a new propshaft aswell when I went to the 4 bolt flange M78.It wouldn't surprise me if the issue with the m80 in TVR's was, they used quite a long nosed 6 bolt cv pinion flange, followed by a 4-bolt prop shaft adapter. That flange was fine for a two-piece drive shaft running a centre bearing and a cv joint at the diff, but a one piece with a uj would be putting immense strain on the pinion bearing causing potential premature failure.
Edited by v8sag on Monday 14th September 22:43
If a customer complained , the factories way of fixing the problem with M80s was to revert to the M78s
.Edited by The Three D Mucketeer on Tuesday 15th September 12:34
It was nearly 20 years ago and Heath(XWorks) and John Reid (Grantura Engineering) did it for me ... I had the old propshaft for years (but sold it last year) and there was an adapter with it. I guess because of the adapter the propshaft was shorter hence I needed the longer propshaft with the M78 without an adapter ...But I'm guessing.
oleander said:
Hi all,
I'm looking to buy a Tuscan. Tried a wonderful Mk3 earlier in the week.
But was surprised to hear some 'diff backlash' on so late a car (Sept 2006).
1. Is this normal: i.e. the soft, occasional clunk.
2. Do the earlier Mk1's have the same characteristic?
It was 1st registered 1st Sept but I would imagine it was "built" between 1st Jan'06 and June-06 at the latest, since nothing came off the line after that I'm looking to buy a Tuscan. Tried a wonderful Mk3 earlier in the week.
But was surprised to hear some 'diff backlash' on so late a car (Sept 2006).
1. Is this normal: i.e. the soft, occasional clunk.
2. Do the earlier Mk1's have the same characteristic?
Edited by oleander on Friday 11th September 14:15
Probably sat in Drivestyle at Harrogate for a while.The last 4 digits of the VIN will give an indication of when it entered the order/build process.
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