i got a pm from (EST)MahviaDeTyrk saying that some of my diff info was not totally correct, so im trying to get it sorted. my dodgy info is in relation to the H233 (+B) diffs.
ive been doing heaps of google reading and from what i can gather
- H233 have 10mm ring bolts @ 180mm PCD and H233B have 12mm ring bolts @ 176mm PCD.
- H233 are in MQ rear and are only 31 spline.
- H233B are in GQ front and rear and are 31 and 33 spline.
this is all confirmed by the ARB air locker catalogue, different part numbers for the 3.
(EST)MahviaDeTyrk mentions that H233B were in the rear of some MK, anyone confirm?
and to add further confusion, the service manual lists all the rear diffs as H233B. this must be wrong.
so summing all this up;
Lockers\LSD that replace the whole centre (ie attach to the ring)
- a GQ rear locker cannot be used in a MQ because they have more splines.
- a GQ front locker will not bolt into a MQ rear, because they have different ring bolts.
- a GQ front locker will bolt into a MK rear, if they exist.
Now something like a Lokka or mini-spool, which replace the spider gears inside an open centre, these should be compatible between GQ front and any MQ/MK rear, because they are all 31 spline.
Ring+Pinion
- GQ R+P from front and rear diffs will not bolt into a MQ rear, because they have different ring bolts.
- GQ R+P from front and rear diffs will bolt to MK rear, if they exist.
Now a couple of questions, are the 3rd members (ring, pinion and centre bolt in assembly) all the same and interchangable into different housings? i found the following on another site;
"The H233B 3rd member changed from 9 bolts to 11 studs to hold it to the housing beginning with the 1990 models. Somewhere along this time (maybe around 6/89, the bolts holding the ring gear to the carrier changed from 10mm to 12mm, making a difference in replacement gear sets."
I think this comment is slightly wrong, it must be trying to say that when the H233B came about with its 12mm ring bolts, the third member also gained 2 extra bolts. So to answer my own question, H233B third member is not interchangable with H233, correct?
I havent heard of a MK 3rd that would not bolt into a MQ, so this suggests to me there is no H233B rears in MQ/MK. Or the third member bolt pattern has nothing to do with its 'internals', ie it can be 9 bolt and 12mm ring bolt and still be H233B.
Last question, the pinion flanges (to the driveshafts), are these the same? I tried putting a GQ driveshaft into the rear of my MQ, but the flange was too big. I dont remember if I used a GQ front or rear though, so dont know if both GQ have larger flange pattern or if only 33 spline H233B have bigger flange. This actually poses another question, are these pinions all the same H233/H233B and will they swap between the different 3rds? And will the flanges swap on the different pinions. And will a H233B ring/pinion/centre from a 11 bolt 3rd bolt into a MQ 9 bolt 3rd?
ive been doing heaps of google reading and from what i can gather
- H233 have 10mm ring bolts @ 180mm PCD and H233B have 12mm ring bolts @ 176mm PCD.
- H233 are in MQ rear and are only 31 spline.
- H233B are in GQ front and rear and are 31 and 33 spline.
this is all confirmed by the ARB air locker catalogue, different part numbers for the 3.
(EST)MahviaDeTyrk mentions that H233B were in the rear of some MK, anyone confirm?
and to add further confusion, the service manual lists all the rear diffs as H233B. this must be wrong.
so summing all this up;
Lockers\LSD that replace the whole centre (ie attach to the ring)
- a GQ rear locker cannot be used in a MQ because they have more splines.
- a GQ front locker will not bolt into a MQ rear, because they have different ring bolts.
- a GQ front locker will bolt into a MK rear, if they exist.
Now something like a Lokka or mini-spool, which replace the spider gears inside an open centre, these should be compatible between GQ front and any MQ/MK rear, because they are all 31 spline.
Ring+Pinion
- GQ R+P from front and rear diffs will not bolt into a MQ rear, because they have different ring bolts.
- GQ R+P from front and rear diffs will bolt to MK rear, if they exist.
Now a couple of questions, are the 3rd members (ring, pinion and centre bolt in assembly) all the same and interchangable into different housings? i found the following on another site;
"The H233B 3rd member changed from 9 bolts to 11 studs to hold it to the housing beginning with the 1990 models. Somewhere along this time (maybe around 6/89, the bolts holding the ring gear to the carrier changed from 10mm to 12mm, making a difference in replacement gear sets."
I think this comment is slightly wrong, it must be trying to say that when the H233B came about with its 12mm ring bolts, the third member also gained 2 extra bolts. So to answer my own question, H233B third member is not interchangable with H233, correct?
I havent heard of a MK 3rd that would not bolt into a MQ, so this suggests to me there is no H233B rears in MQ/MK. Or the third member bolt pattern has nothing to do with its 'internals', ie it can be 9 bolt and 12mm ring bolt and still be H233B.
Last question, the pinion flanges (to the driveshafts), are these the same? I tried putting a GQ driveshaft into the rear of my MQ, but the flange was too big. I dont remember if I used a GQ front or rear though, so dont know if both GQ have larger flange pattern or if only 33 spline H233B have bigger flange. This actually poses another question, are these pinions all the same H233/H233B and will they swap between the different 3rds? And will the flanges swap on the different pinions. And will a H233B ring/pinion/centre from a 11 bolt 3rd bolt into a MQ 9 bolt 3rd?