Bundera Diff swap : Please clarify

Post by **Skip** » Tue Dec 09, 2003 9:54 am

I know this has been talked about alot, but i want to finally get some clarity on this issue before i go doing anything. I want to swap my 4.875 ratio to 4.3:

1. Is it possible to simply just swap crown wheel and pinions over? I have 4 pinion diffs so i will need to find 4 pinion 4.3 gears?

2. If i was to just swap complete centres, fitting a 4.3 centre to a 4.875 housing will require some recessing of the housing?

Thanks

Post by **dow50r** » Tue Dec 09, 2003 3:44 pm

All should fit straight in, and be interchangeable.
Andrew

Post by **Bundytime** » Tue Dec 09, 2003 7:29 pm

i have fitted 4.3 and 4.5 and 4.8's all to the same housing, with 4.5 being the original diff centre.........
i cannt think of any differences??????? only that u refer to your high pinion as 4 pinion????? what do u mean by 4 pinion?

Post by **Skip** » Tue Dec 09, 2003 11:13 pm

http://home.4x4wire.com/erik/diffs/#rear

Just did a bit more research and found the above site. My diffs are cleary the V6/turbo type, my code is G**4, the 4 signifying an open 4 pinion centre found only in the turbo or v6 trucks, as i have a 2.4 turbo bundy. Im not sure about the difference between 4 pinion and 2 pinion perhaps someone else can clear this up.

Taken from the above URL, refering to my 4.88 4 pinion turbo diff:

Although somewhat rare, there is a version of this diff that came from the factory with 4.88 gears. The carrier (3rd member housing) has a different pinion offset so that the ring gear doesn't need to be as thick. This means that no gears other than the factory 4.88's will fit this particular diff. However, diff cases, commonly called carriers (factory, LSD, lockers, etc.), for the standard V6/Turbo diff should be interchangeable (4cyl and V6/Turbo carriers are NOT interchangeable).

If this is true i will not be able to swap gears with even other 4 pinion diffs cause mine is 4.88, and even centres between 2 and 4 pinion are not interchangeable.

Comments and experiences with these different types of diff would be much appreciated guys.

Cheers

Post by **dow50r** » Wed Dec 10, 2003 7:25 am

So what that says is your carrier and gears are unique. If you want to change gears you need another carrier and gears will then be interchangeable. Your 4 pinion lsd however will fit any of the above, being std measurements accross the board.
4 pinion means 4 sungears and pinions that carry them in the centre as opposed to 2 pinion with 2 sungears, twice as strong.
Andrew

Post by **Skip** » Wed Dec 10, 2003 9:35 am

I understand it to mean i can only use other v6/turbo truck 4 pinion carriers in my diff housing, 2 pinion centres will not fit. This is really going to narrow down my options trying to find a set of diffs. :(

Post by **dow50r** » Wed Dec 10, 2003 5:33 pm

Ok i have re read the page, and firstly, it is american.Who knows what Toyota did over there... the 80 cruiser has semi floating axles and drums over there.......go figure....
It talks about 4 pinion carriers being beefed up, and larger bearings being used in them. It says the 4.8 4 pinion was a different carrier with a thinner ring gear but strength turns out to be close to thesame as normal.
Ive never heard anyone over here have problems changing over gear ratios, and the ARB loka for all lux ctrs (2 and 4 pinion) are thesame.
Andrew

Post by **Bundytime** » Wed Dec 10, 2003 5:44 pm

i think that u r getting worried about nothing, i dont think they r even talking about hi pinion diffs in the bit u refer too????? and where they r it says..... "the 8" V6/Turbo diffs can be installed (direct bolt-in) in the hi-pinion diff. The entire diff is also a direct bolt-in to all front and rear axles that use an 8" diff.
mmmmmmmm y do u think yours is a 4 pinion?????

Post by **dow50r** » Thu Dec 11, 2003 4:38 am

One thing i picked up is they have the 4 pinion open diff over there....never heard of one here, i have a 4 pinion LSD which is common in the ass end of the later luxes, and you can see the diff-erence in the photo on the website compared to what i have on the bench.
Is your rear lsd or open?
Andrew

Post by **dow50r** » Thu Dec 11, 2003 4:39 am

I better clarify that....is your rear DIFF open or lsd?? :roll:

Post by **Skip** » Thu Dec 11, 2003 10:43 am

Geez that was a bit personal Andrew :oops:

I had never seen the open 4 pinion rear either, all the turbo diesel bundys i looked at were G145, 4.88 4 pinion. Then when my car came in from Japan the code is G144, 4 pinion open wheeler. I have also confirmed its a freewheeler by jacking one of the rear quaters, and the tyre on the quater still spins when the other is firmly on the ground.

Post by **dow50r** » Thu Dec 11, 2003 7:01 pm

Would be good for the front centre if you cant get a better one. Yours will be thesame as the pictured d4ential.
Andrew

Post by **RUFF** » Thu Dec 11, 2003 11:01 pm

Skip wrote:I know this has been talked about alot, but i want to finally get some clarity on this issue before i go doing anything. I want to swap my 4.875 ratio to 4.3:

Thanks

All you need is a pair of 4.3 Petrol Bundera complete Third members. Pull your axles unbolt the centres and bolt the new ones in. No messing around with gear set ups needed and the housing does not need to be modified in any way. Then sell your complete 4.8 third members.

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Bundera Diff swap : Please clarify

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