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Surf 94 KZN130 Diff Ratio Upgrade
Posted: Tue Oct 02, 2012 7:41 am
by Kumarakid
Restarted topic from my snorkel thread:
Kumarakid wrote:Well I have had to put the snorkel on hold temporarily dammit as I smashed a front diff flange (mechanic tells me) out at Woodhill the other week. Unfortunate as I had just convinced my wife of its importance grrrr! Anyway before the diff went I was considering having the ratios changed as I am sick of the lack of power with 33" tyres on anyway (100kmph = 2100rpm that's crap). Also sux when towing as the converter doesn't lockup in top till you hit 85kmph so everything is gettin a bit hot.
Now I have read extensively on this topic but I cant for the life of me explain why I didn't first ask for live opinions on here before I went out on a limb and buy second hand diffs which are being fitted today. The original ones are 4.1 ratio with the rear being a lsd and we are replacing them both with 4.8 with the rear again being lsd.
I must say convincing my wife as to why I am replacing both diffs when I only broke one of them has been blardy tough not to mention trying to look gutted when I'm actually stoked lol. Get the truck back today.
My surf is an auto 3litre diesel and this is a happening thing now but I am interested in anyone's thoughts here or let me know what you have done to yours please.
UBZ wrote:If you had 4.1 ratio diffs and 31" tyre from factory .
You should only need 4.3 ratio diffs to correct the 10% change in tyre size going up to a 33" tyre.
Much easier to find and cheaper to get than 4.8 diffs ... considering that you will probably blow another front diff in the future.
nismo26 wrote:x2 4.3's would have been perfect for 33's
Kumarakid wrote:Ahhhh oops too late 4.8's are going in now as in post. Should have asked here first I know so looks like they will be for sale in the future. Will post on how it go's. This one below has 4.8's and he rekons it goes well but I didnt get a reply on rpm's@100kmph which is what I really wanted to know.
http://www.trademe.co.nz/Browse/Listing ... =508566462
evolution02 wrote:Yeah I asked him as well and the original builder on here but neither replied
I fitted 4.3s to a mates surf the same as ours with 33's and he says its better but not by much.
So I have 4.5's sitting in my garage to fit in the next couple weeks
I was close to going 4.8
You should have a good improvement in pick up and will help reduce load when towing.
Just a bit higher revs at 100k's
Let me know what ya think
Re: Surf 94 KZN130 Diff Ratio Upgrade
Posted: Tue Oct 02, 2012 7:42 am
by Kumarakid
Hey man yea well this has been a major head masher for me and every time I woke up I was changing my mind between 4.5s and 4.8s open with locker or lsd!. Anyhow to update the 2x4.8 replacement diffs arrived at my mechanics but they weren't happy with the rear so pulled it apart and the center was mashed so wrecker offered to replace the center (great service from these dudes at wholesale 4x4 Kumeu blardy awesome) of which he only had opens which spurred me to decide to go with that and add a lockright to it which means these will be staying in as I will have run out of putea to go back lol.
So at the moment I'm still trying to source a 4 pinion 30 spline lockright for it in a hurry.....yep tried Tim and xtreme wholesalers......will update you as it progresses mate.
Re: Surf 94 KZN130 Diff Ratio Upgrade
Posted: Tue Oct 02, 2012 9:04 pm
by evolution02
I fitted lockrights about 3 years ago. Really good for the money and work great for off road. Will have an affect on your turning circle.
Have to change your driving style on road a bit due to having one in the rear ie gentle when accelerating around corners
The diffs I fitted to my mates KZN130 was with a shimmed LSD and in the weekend was frequently spinning one rear wheel.
Also the 4.5 rear I have is LSD but will be swapping over my lockright(LSD is sold)
Re: Surf 94 KZN130 Diff Ratio Upgrade
Posted: Wed Oct 03, 2012 5:43 am
by Kumarakid
Yup I get the theory side of the change in driving styles that will be necessary but thankfully this wont be my daily drive once its done anyhow. I do now have a verbal order for the lockright in with Tim aka suzolla bless him!
Re: Surf 94 KZN130 Diff Ratio Upgrade
Posted: Wed Oct 03, 2012 9:25 am
by suzolla
Hi Rog,
Have just heard back from supplier in the States who contacted Lockright who said they were out of Stock and could not give a date when they would be available, so sorry can't help for a quick supply. Will have some in 2 to 3 weeks time when my shipment arrives. Would be interested when Extreme can get them, perhaps has different supplier, other option is the Spartan if you cant wait.
Apologies for getting your hopes up.
Cheers
Tim
Re: Surf 94 KZN130 Diff Ratio Upgrade
Posted: Wed Oct 03, 2012 10:15 am
by Kumarakid
Re: Surf 94 KZN130 Diff Ratio Upgrade
Posted: Wed Oct 03, 2012 6:41 pm
by SamLogan
i am selling my lockright if you want it. it is about a year and a half old and looks in good condition. you will need to change the bearings on the carrier as they are bearings to fit in a 2 spider housing. The locker was originally installed in a 4.1 4 spider diff but i wanted to change the ratios and you can only seem to find 4.3 2 spider diffs so i got some bearings to suit. PM me if you are keen.
Sam
