Outer Limits 4x4 Board

so ive come to find out that some 4.8 lux gears i bought wont fit in my 4.3 centres without spacing the ring gear out closer to the pinion... ive never read anywhere of this bein done... can you buy spacers? or would i have to get them made up specailly??

just after suggestions, opinions??

The spacer would probably be too thick and may push the crownwheel off the spigot . Why not just use the proper housings?

madmont wrote:The spacer would probably be too thick and may push the crownwheel off the spigot . Why not just use the proper housings?

thats fine if your made of money.....

Spacers will cost you money and the 11mmx1mm pitch high tensile fine thread screws to hold the crownwheel on will probably be hard to find as well. If you want I can email you a drawing you can give to the man with the nc cutting machine[water plasma laser] so he can cut it for you. Then you have to get it accurately ground to the size you have decided it should be. As someone once said "life was not meant to be easy".

i think the screws will already be long enough... becuase these are stock yota gears they are thinner, but when u buy after market 4.8s they make them fatter so they fit in the 4.3 3rd member if desired... this leads me to beleive their is room... a skinny crownwheel and a spacer is the same as a fatty with no spacer

Yer but you still need longer bolts, or you well just pull them out of the threads as you would only have a few threads ingauged.
Just buy the 4.8 housing it will be cheaper in the long run and stronger.
Its the pinion offset in this houseing thats different to yours.

It's not the crownwheel ,but the pinion that you need to shim to get the right gear tooth depth.

hophoar wrote:It's not the crownwheel ,but the pinion that you need to shim to get the right gear tooth depth.

i hate to ask.. but how the fark can u shim a pinion, its round, and must run though a hole in the end of the 3rd member, and also though a seal... so wouldnt shimming it sideways fark all this alignment up?

The shim goes between the end of the gear and the bearing which lifts the pinion up into the crownwheel. Check it out on pirate they'll have the answers for how much spacer needed. Pull a diff apart and you might understand where the spacer needs to go as there is usually a shim in there that gives the correct pinion depth.

John.

hophoar wrote:The shim goes between the end of the gear and the bearing which lifts the pinion up into the crownwheel. Check it out on pirate they'll have the answers for how much spacer needed. Pull a diff apart and you might understand where the spacer needs to go as there is usually a shim in there that gives the correct pinion depth.

John.

still dont get it... i was under the impression that it wasnt the depth of the pinion that is diffrent between 4.3s and 4.8s but how fat it is... ie. 1 less tooth on the pinion so its got a smaller dia.... so the teeth of the pinion dont mesh compleatly into the teeth of the crownwheel...their would be to much gap between them.....

Yep your right it's not the depth of the pinion thats different between housings, but you need to shim the pinion to achieve the correct tooth depth. You agree that they are bevil gears and that you wanted to shom the crownwheel off the hemisphere to get the correct backlash for the gears and to do this would require specially made spacers. By shimming the pinion, your essencially doing the same as shimming the crownwheel by moving the gears toward each other to achieve the correct backlash. Pinion shims are readily available in a number of thicknesses, so don't need any special shm made and theres a fairly big seal surface that can accomodate the moving of the pinion up into the housing.

hophoar wrote:Yep your right it's not the depth of the pinion thats different between housings, but you need to shim the pinion to achieve the correct tooth depth. You agree that they are bevil gears and that you wanted to shom the crownwheel off the hemisphere to get the correct backlash for the gears and to do this would require specially made spacers. By shimming the pinion, your essencially doing the same as shimming the crownwheel by moving the gears toward each other to achieve the correct backlash. Pinion shims are readily available in a number of thicknesses, so don't need any special shm made and theres a fairly big seal surface that can accomodate the moving of the pinion up into the housing.

sweet ok so im with u... this means i can take my current centres, and the 4.8 r&ps to a diff shop and they will be able make em fit....or is it more complicated than that??

they should be able to do it , but talk to them first and have the information at hand about what you want them to do. Do a search on Pirate for all the relevant info and go armed as they will not do it unless thay can be persuaded to go outside the norm. It's all got to do with warranty.