Questions from 3000m newbie!
Discussion
Hi,
there are 2 types of diff fitted to M series cars, the first is Triumph sourced and is identified (I think) by being smaller and having a square section tubular steel carrier.
the second is the Salisbury 4HU as fitted to many Jaguars (and others) and this can be LSD or not - the carrier is made from thick bars of steel and supported by 4 large rubber bushes. there is a way of finding out if you have an LSD by turning the propshaft and one driveshaft and depending on the direction of the free driveshaft you can tell if it is LSD or not but don't hold me to that....
don't know if this applies to all but my 'M' has an access hatch in the rear parcel shelf in order to access the diff from above held in with four self tapping screws.
the oil is different for each type and the best person to ask is Adrian at Exactly TVR
the driveshafts and UJ's are Triumph sourced (most of the parts are TR6 but some of the mechanicals are from the 2500/Spiftire range.
there are 2 types of diff fitted to M series cars, the first is Triumph sourced and is identified (I think) by being smaller and having a square section tubular steel carrier.
the second is the Salisbury 4HU as fitted to many Jaguars (and others) and this can be LSD or not - the carrier is made from thick bars of steel and supported by 4 large rubber bushes. there is a way of finding out if you have an LSD by turning the propshaft and one driveshaft and depending on the direction of the free driveshaft you can tell if it is LSD or not but don't hold me to that....
don't know if this applies to all but my 'M' has an access hatch in the rear parcel shelf in order to access the diff from above held in with four self tapping screws.
the oil is different for each type and the best person to ask is Adrian at Exactly TVR
the driveshafts and UJ's are Triumph sourced (most of the parts are TR6 but some of the mechanicals are from the 2500/Spiftire range.
They didn't have an lsd as standard unless it was a Turbo. The diffs on the early cars are a TR6 and later they used a Salisbury 4HU or PowrLok (lsd version). This is also the same as the diffs used by Jaguar. GKN can refurb these diffs still although they are fairly bulletproof. Hope this helps.
Corin
Cars from chassis no. 3919 had Salisbury (Jaguar) diffs (though being TVR this isn't strictly true!).
The TR6 diff is ok, but not if you mod the engine, and the carrier is weak and often needs beefing up. The TR6 diff can come out through the side.
The Salisbury is heavy, virtually unbreakable and only comes out through the top. In my experience its far easier to remove the body to do this as access through TVRs hole is not great, and you have brake-lines, fuel lines etc by the top of the diff and swinging a great weight of diff on a hoist can cause damage. Also you need to remove the rear window and when it goes back - the leaking saga will begin again!
My Taimar was originally fitted with a TR6 diff, which we tore the front plate off and broke the carrier with a mildy modded engine! I replaced it with a s/h ex 3000M turbo nonLSD Salisbury diff, which lasted a few thousand miles before running a bearing. I then put in a Salisbury Powrlok, (runnning on special LSD oil), what a diff, absolutely great, superb traction especially on tight turns.
Its a lot of hassle changing the diff, which ever way its done, so unless your diff is broken, I would learn to drive round your cars shortfalls!
davidy
Cars from chassis no. 3919 had Salisbury (Jaguar) diffs (though being TVR this isn't strictly true!).
The TR6 diff is ok, but not if you mod the engine, and the carrier is weak and often needs beefing up. The TR6 diff can come out through the side.
The Salisbury is heavy, virtually unbreakable and only comes out through the top. In my experience its far easier to remove the body to do this as access through TVRs hole is not great, and you have brake-lines, fuel lines etc by the top of the diff and swinging a great weight of diff on a hoist can cause damage. Also you need to remove the rear window and when it goes back - the leaking saga will begin again!
My Taimar was originally fitted with a TR6 diff, which we tore the front plate off and broke the carrier with a mildy modded engine! I replaced it with a s/h ex 3000M turbo nonLSD Salisbury diff, which lasted a few thousand miles before running a bearing. I then put in a Salisbury Powrlok, (runnning on special LSD oil), what a diff, absolutely great, superb traction especially on tight turns.
Its a lot of hassle changing the diff, which ever way its done, so unless your diff is broken, I would learn to drive round your cars shortfalls!
davidy
Corin with those side holes on the front arches it looks like an early 70's 3000 (the same as the 1600M and 2500 until they did the mid 870 restyle removing the holes). It should be a TR6 diff which if built well are fine up to about 180bhp - considering the std 3 litre lump had crap 138bhp and 176is ft/lbs torque you will have a long way to go in over loading a diff in good mick.
Over 180bhp you would be better finding a Salisbury LSD guts for it. We have two of these on in tr4 (not same casing as live axle 250ish bhp!) and one in TR6 that will have the full 260bhp all steel race lump in few months.
If you need a good name to build any of the Triumph bits let me know.
I had a good a gas flowed engine in my 3000M about 17 years back - good for about 160bhp I guess and nbot one problem in 18 months - then lost license! (and got into Triumph - had to sell it as banned to bought TR racer - could have bought a few TR's with the cash spent on it since 90!)
Over 180bhp you would be better finding a Salisbury LSD guts for it. We have two of these on in tr4 (not same casing as live axle 250ish bhp!) and one in TR6 that will have the full 260bhp all steel race lump in few months.
If you need a good name to build any of the Triumph bits let me know.
I had a good a gas flowed engine in my 3000M about 17 years back - good for about 160bhp I guess and nbot one problem in 18 months - then lost license! (and got into Triumph - had to sell it as banned to bought TR racer - could have bought a few TR's with the cash spent on it since 90!)
jellison/corin
its not the TR6 thats weak so much as the TVR carrier. I have seen several cracked carriers, including mine! They can be beefed up, thicking plates, better webbing, etc. Also the TVR installation seems to put more pressure on the TR diff front plate, again I have seen several cracked (broken) including mine.
Adrian Venn ran one in his 76 Turbo (Orange Car) for many miles without incident, that that was putting out way more than 180bhp, so there is nothing wrong with the diff itself, just TVr's mounting!!!
davidy
its not the TR6 thats weak so much as the TVR carrier. I have seen several cracked carriers, including mine! They can be beefed up, thicking plates, better webbing, etc. Also the TVR installation seems to put more pressure on the TR diff front plate, again I have seen several cracked (broken) including mine.
Adrian Venn ran one in his 76 Turbo (Orange Car) for many miles without incident, that that was putting out way more than 180bhp, so there is nothing wrong with the diff itself, just TVr's mounting!!!
davidy
The 1st 6 Turbo's had the TR6 diff and the 3.45 ratio which make them much quicker than the later cars (with no top speed..115-120 and prone to venting oil out the dip-stick as they would rev to 7000) and once the carrier frame is sorted (£40 ), assuming that you do not go bigger that 195 70 14 tyres, the diff is OK for 222 BHP. The issues are, that fitting the JAG LSD is pointless unless you reset the ramp rates to suit a 1 Ton car instead of a 2 ton car and that means that cost-wise if you are thinking of converting from TR6 to Jag you would most certainly fit the Quaife TR6 unit .....There are people out there getting rid of the very heavy JAG unit and putting the Quaife TR6 unit IN. The normal way to go (for the later jag unit cars) would be to fit the Quaiffe internals to your JAG unit , which is gives the car fantastic drive-ability out of corners
Gassing Station | TVR Classics | Top of Page | What's New | My Stuff