New diff?
hey guys just wondering if i could put in a lsd into my VS acclaim, IRS.
do you know roughly how much it would cost, and where to get it done?
cheers
Most performance/diff/transmission joints should do it for you. Cost will depend on if your just going LSD, or if you want a new set of gears too. The cheapest option would be to buy a 2nd hand LSD of ebay or a forum and put it in yourself. Ive seen them pop up for around the 500 mark
thanks man, what is the best option for a v6 vs
what would be the main gain in putting in a lsd
A few hundred k's ago I've changed to a 4.11 LSD. I got a fully rebuild unit from ebay for $950 + post. Also you need to swap it over, so allow 4hrs yourself, or you will need to pay someone to do it.
I think if you are looking at a LSD to help with traction, you might as well look at a different ratio to help with performance off the line.
In my case with an auto and the 4.11, the car is 100 times more responsive, I should have done it ages ago. The key when picking ratios is you need to match it to your driving habits. 4.11 really helps get you up and going, but I would hate to drive around Australia with it. My car never goes more than about 20-30 kms from home, so for me I'm loving it.
If you do a fair bit of country driving and have an auto I would go the 3.73 ratio.
QldKev
I went 3.46 ratio LSD and I was pretty happy with that. Ive been in a 4 sp auto with 4.11's and didnt like it. The first gear felt like a waste of time really, but thats just my opinion.
The LSD will give you heaps better traction off the line and you wont get the gay arse single wheel wheelspin when you sink the boot in around a corner.
The different gears will give you more rear wheel torque giving you better take off. The disadvantage is your engine will rev a bit higher causing a bit higher fuel consumption
4.11's, first gear being a waste of time? Yep, it is hard to get it to hook up properly, but 5500rpm in 1st with the 4L60e is 53km/h; so there is plenty of use for it. You just get there a lot quicker. With 3.46 you get 63km/h out of first so it's not that huge of a difference.
Also fuel economy around town I have found it actually better with the 4.11 cause the engine is not working as hard to lug the car around. I've averaged 15.2L/100km since the change, It was 16.5L/100km before. Also I have been driving it harder since the change, but now I'm getting used to it I will back off a bit and probably get a bit better. Country I do think it would be worse due to the constant higher revs.
In my case I think LS1 + 4.11 = Win!
Like I mentioned before 4.11's would not suit a car that travels long distance all the time. If I drove a lot of 100km/h zones I would have went the 3.73, but even the 3.46 is still a good upgrade from the stock diff.
QldKev
If you are reasonably mechanically competent you do it it your self as long you are doing the center only but as said above if you are changing diff gears get the professionals to do it Although If you get the gears as matching set with shims they are not too hard to set up and make shore you get the right center and gears
there are two series M78 and M80 best way to tell them apart is 3.07,3.46 ratio = 80 & 3.08,3.45 =78 etc and this might comein handy
How fix 1 type of diff whine and to disemble a IRS Diff
Originally Posted by vsl67
Is there a way to externally identify the difference between the 78 and 80 diffs?
QldKev
Fair enough, I only based my observations on a short drive where it hardly seemed to ever go into 1st gear, and when it did it was revving hard at fairly low speed. The owner of the car loved his 4.11s tho and they suited the kind of driving he did
removed due to trolls
Last edited by vsl67; 29-02-2012 at 10:13 PM.
so what would be the best bet for a v6 4 speed auto, like i wanna go fast off the line, but not ridiculous fuel consumption
3.45 ratio would be your best bet
3.45 if you drive a lot of country
3.73 for a few country trips away
3.91 for not too many country trips
4.11 for virtually no country trips
4.11 is the best for fuel economy around town
3.08 is the best fuel economy for country.
No one can tell you what is best for you. You need to pick to suit your driving habits. I went 4.11 cause it suits my driving habits.
3.45 would most likely be cheapest as some manuals had them factory, and you should be able to pick up a diff where someone has upgraded.
QldKev
Last edited by QldKev; 30-05-2011 at 09:05 PM.
im a p plater, i dont usually drive long trips, my longest would be probs an hour or two, i dont go on dirt roads, and i only drive her 3-4 times a week. do you think 4.11?
also what kind of change will a 4.11 ratio give me.
cheers for the info an quick replies.
I've got some numbers on my website
home.exetel.com.au/qldkev (V8 diff ratios, but very close)
I'm guessing you have a 3.08 ratio
3.07 to 4.11 = 33.9% change, so a huge change in the lower gears waaay more pick up, and a lot more responsiveness in all gears.
At 100km/h you will change from 1790rpm to 2396rpm.
A rough rule of thumb is drop your car back into 3rd and drive around on the open roads, this will be equivalent revs in 4th with 4.11. I don't think its bad at all. The motor sounds way more free reving and happier.
I'm currently loving mine from the change, I drive my car everyday. My old 5.0L VK used to do 3300rpm at 100km/h (only 3 speed auto) and that was too many revs.
If you feel like a holiday visit Bundy, and I'll take you for a spin.
QldKev
Last edited by QldKev; 30-05-2011 at 08:58 PM.
Qldkev Do you have an auto? How did the gear shifts go with the 4.11's? When I changed to 3.46 the gear box doesnt quite know when to shift at 80k's ,I heard some people have a lot of gearshift problems while others dont
cheers man, yeah i think maybe 4.11 one day.
yeah for sure bro, one day, when my cars in a decent state, ill come for a spin, and you can have a go in my huge 3.8 v6 :P
shoot us your email or a friend req or something
Yep, auto. I do have a LS1 (different computer) and a mafless tune, which part of it they changed the transmission shift pressures etc. No problems with the shift points at all.
What colour is your trans fluid, and when was it last changed?
I was thinking about it, and you said you do go a hour or two. Depending on how frequently you go I would look at 3.73 ratio. They would be heaps better on the trip. Even a 3.9 would be a bit bitter of both worlds.
QldKev
Ive never dropped the pan on the auto Its about due the fluid is still very clean and bright red however the car had shift problems with a larger TB once before I got sorted with a tune from it throwing out the TPS but now with the 3.46 's its seems to hunt for the right gear on light throttle and doesnt quite change up a gear at 80kph revs a little too high otherwise everything else is fine ,I think I need the tune readjusted to suit the gears
well what would be best suited for a p plater with a v6 3.8L auto, as a daily driver, driven maybe 4 times a week, and for about an hour or two.
cheers
removed due to trolls
Last edited by vsl67; 29-02-2012 at 10:10 PM.
Id say 3.46 or 3.73
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