Diffs Differentials Diff Codes Transaxles and more

[Wedged'86]

I know this is the question of a stupid noob but i've looked everywhere on the net and can't find the simple answer.
When you buy an aftermarked lsd centre do you keep your ring and pinion?
I don't know much about diffs..................

[airfireman1]

Thats normally the case. You basically answered your own question whe you said "LSD CENTRE". You are just getting the centre and not the crown wheel and pinnion.
Cheers

[SillyCarS]

you cant mix and match different ring and pinnion gears of varying ratios (obvious) nor can you even mix and match different ring and pinnion gears of the same ratio (due to the ware rate). there is nothing "normal" about keeping or throwing away the ring and pinnion set, cos it depends on what you're after, this is toy 'mods' not toy 'stock'. what i mean by that is; you may want an lsd, but for your application your may require a different ratio

hope that helps

craig

not such silly question either

[Wedged'86]

ok thanks alot
so i take it "crown wheel" is a synonym for ring gear.
i was also under the impression that a diff's size (7", 9")was the diameter of it's ring gear.
so to change my ratio, i have to change my ring and pinion anyway?

[whatthe?]

ok thanks alot
so i take it "crown wheel" is a synonym for ring gear.
i was also under the impression that a diff's size (7", 9")was the diameter of it's ring gear.
so to change my ratio, i have to change my ring and pinion anyway?

Correct...

[Wedged'86]

Ahh the world of differentials makes so much more sense.
i have one more question though: does the size of the diff like 9 inch or 7 inch mean it's any stronger? i was also under that impression.

[GasedT18]

Hi mate,

generally speaking the bigger & heavier the stronger - that's why 4WD diff's e.g., Hilux, Landcrusers and trucks etc have big diff housings because inside are bigger bits that are needed to handle the higher loads. Not only the diameter of the crown but also the width of the crown and pinion gears are a factor in strength too as well as other parts that make up the internals, so there are diffs that have similar crown sized crown gears but have different load ratings and therefore what I started with is a simplification OK. Toyota G and F series diffs are often sought after for their strength.

I can see from the direction of your questions that you probably have a lot more and there is a lot of information on diffs in this forum; not necessarily all of the common information in one place so it's worth searching but here's some links for starters:

Toyota Diff Codes:
DiffCodes.doc

Toyota Transaxle Database / Diff Database
http://toyotaaxle.norbie.net/
This was put together with the input of a lot of people and a computer wiz member Norbie - thanks Norbie - and the thread of this colaboration is worth reading
Toyota diffs. All data being collated onto one table. Specs/input needed (RWD)

Tech Info: Toyota Differentials
Differentials.pdf
It's 21 pages, 288Kb in Adobe Acrobat PDF format - thanks Peter (aka infotechplus)

Diff Pictures:- thanks river
Exloded diagrams of some early model toyota diffs

Choice of Gearbox Ratios and Diff Ratios
This thread is worth a read to understand the interaction between gearbox ratios and diff ratios and the final drive ratio and has links to some wiz calculators
diff ratios and combos

Gearbox Codes & Ratios
Gearboxes

[Wedged'86]

WOW!
thanks alot for all that. i tried searching for diff info in the search but i never found all that.
thanks again.