Corona Rt104 Diff Specs

[machg]

Hey guys, I am looking for another, better diff for my AE71 wagon (leaf-spings). I have done a fair bit of searching, and it looks like an F series from a RT 104 Corona might be the best option. It looks like it will have the right stud pattern (4x114.3) and the right suspension mounts (leaf springs), but I can't find what width it is. Does anyone know?

[Rolliac]

I thought my old RT104 (1978) had a T series diff. pretty sure it did anyway. Whatever it was it handled a lot of abuse.

[machg]

I thought my old RT104 (1978) had a T series diff. pretty sure it did anyway. Whatever it was it handled a lot of abuse.

Hmmmm, maybe its only Jap spec GT models that had F series?

[styler]

yeah rt104 early model has t series,

late rt104 model could have f series?

 

aus spec was borg warner?

jap spec was t or later maybe f series?

 

i pulled out one of these t series diffs i think they are 1440mm wheel mounting face to wheel mounting face

or maybe 1410mm at second guess, might see if i have the specs written down somewhere...

 

you would have to move the leaf mounts if they are not spot on though, even 10mm out will flog out the bushes over time.

 

and you can sacrifice the new leaf mounts when cutting off to avoid damaging the new housing and then sacrifice the old diff when

cutting the old mounts to weld to the new diff so you end up with well cut mounts on an undamaged diff housing if you get my theory.

 

check shock mounting too, the early t series comes with lower plates that have a shock mount on them which may line up if you get stuck?

Edited August 17, 2009 by styler

[machg]

yeah rt104 early model has t series,

late rt104 model could have f series?

 

aus spec was borg warner?

jap spec was t or later maybe f series?

 

i pulled out one of these t series diffs i think they are 1440mm wheel mounting face to wheel mounting face

or maybe 1410mm at second guess, might see if i have the specs written down somewhere...

 

you would have to move the leaf mounts if they are not spot on though, even 10mm out will flog out the bushes over time.

 

and you can sacrifice the new leaf mounts when cutting off to avoid damaging the new housing and then sacrifice the old diff when

cutting the old mounts to weld to the new diff so you end up with well cut mounts on an undamaged diff housing if you get my theory.

 

check shock mounting too, the early t series comes with lower plates that have a shock mount on them which may line up if you get stuck?

 

Man I am going to have to take some pretty careful measurements. Going to ring around wreckers tomorrow and see what I can find. I am leaning towards early Tarago E series ATM.

[styler]

Man I am going to have to take some pretty careful measurements. Going

to ring around wreckers tomorrow and see what I can find. I am leaning towards early Tarago E series ATM.

 

remember rwd e series doesnt have factory or aftermarket (yet) lsd as far as i know??

not sure on ratios but the rally boys seem to like them, maybe they lock or run minispools /

full spools in them for rallies?

 

tarago f series is very popular as its quite long and suitable to be shortened,

with thick axles and big bearings etc... its the last of the toyota diffs that has

114.3 and 60mm spigot with thick axles going from memory before 5 stud comes

in which is the later f series?

 

f series has a few factory ratios and lsds available in aftermarket helical and clutch

type versions and maybe more.

Edited August 17, 2009 by styler

[styler]

norbies axle database - toymods

 

check this out if you havent seen it before, its a work in progress of toyota diffs,

awesome if you need specs :P

 

also measuring diffs if you want to be spot on its best to go yourself as wreckers are about

plus / minus an inch for accuracy last time i tried... i used two short steel rulers across the wheel

mounting faces, a friend and a decent measuring tape to measure between the rulers and it will

be to the mm or close to.

Edited August 17, 2009 by styler

[machg]

Have found a diff, see http://www.rollaclub.com/board/?showtopic=29827&st=60. BTW I measured a corona rt104 diff down the road, it was a shit-warner, but its width was identical to my AE71 wagon, but spring mounts looked wider.