80 series diff fitted into 75 series!!!!!

[Bluey]

ok, any advice very appreciated read all sorts of websites like ih8mud.com, cruizers.com, pirate etc etc

bought a 80 series rear diff assembly with locker that will arrive next week and want to fit this myself to 73 mwb. same as 75

so, what do i need to do. as far as i can tell i should have full floating rear axles. can i leave wheels on and unbolt hub and then slide axles out. then unbolt tailshaft, drain oil and unbolt diff assembly????

put back together new gasket needed? do i use gasket goo as well. longer bolts for diff assembly. just rebolt new assembly, slide axles in ....



Cheers
Lance

[spazbot]

axles out
drop the oil
remove tailshaft
remove old center
clean the surface so it seals ok again
just use gasket goo dont bother with a paper seal
complete same process in reverse

[Bluey]

cool, thanks spazbot. so i'm right about leaving wheels on when removing cruiser axles? heard story from mate balancing hilux on two bottle jacks to do this.


this is sounding good, hate paying people to do what i can work out myself (plus advice "how to" from places like here )




Lance

[spazbot]

the cruiser has a full floating rear axles and the hilux has semi floating

for the cruiser you wont need to jack it or nething just undo the nuts that hold the axles in
tap the cone washers out
slide the axles out

the cone washers may give you some grief, i find a few good taps on the side of the axle flange with a hammer or a small socket to fit just over the cone washer and a couple of tapes losens them up to get them out

[skootin]

You may want to check the ratio of the 80 ser center if you intend using the hole center. 37/9 versus 41/10 in the 80 ser

[dow50r]

Hi
Depending on what loka you have in the ctr, you can use the centre from the 80 diff in the centre of the 73 diff, bearings and all though, there is a diff-erence in the id of the bearings and the od of the ctr bearing carrier, but thesame od on both 73/5 and 80.
Andrew

[MADSHORT]

Bluey when trying to remove tapered colletts from rear axles donot hit the flange at all as this will only damage the seat
Undo the nuts but do not remove them
with a drift hit the end of the stud and the colletts will pop straight out
Dont be scared to do this as you will see that the studs have a curved end for this reason
If you go hitting the side of the flange you will distort the taper and then the colletts wont reset correctly (causeing studs to brake and fall out )
The 80series locker will go straight in so long as it is a 4.1 ratio

The job should only take about 30 mins

Gordon

[dumbdunce]

You may want to check the ratio of the 80 ser center if you intend using the hole center. 37/9 versus 41/10 in the 80 ser

4.10/4.11 ratios are more or less interchangable, it doesn't really matter.

[Bluey]

thanks for the replies guys

Hi
Depending on what loka you have in the ctr, you can use the centre from the 80 diff in the centre of the 73 diff, bearings and all though, there is a diff-erence in the id of the bearings and the od of the ctr bearing carrier, but thesame od on both 73/5 and 80.
Andrew

sorry, you've lost me there. not sure which bearings, drive pinion bearing or bearings either side differentail case/ring gear? oh, and is detroit locker

You may want to check the ratio of the 80 ser center if you intend using the hole center. 37/9 versus 41/10 in the 80 ser

shouldnt have problem here, 80 diff has 4.11 and so does mine (standard diff so this meant to be what i have )

Bluey when trying to remove tapered colletts from rear axles donot hit the flange at all as this will only damage the seat
Undo the nuts but do not remove them
with a drift hit the end of the stud and the colletts will pop straight out
Dont be scared to do this as you will see that the studs have a curved end for this reason
If you go hitting the side of the flange you will distort the taper and then the colletts wont reset correctly (causeing studs to brake and fall out )
The 80series locker will go straight in so long as it is a 4.1 ratio

The job should only take about 30 mins

Gordon

was re-reading manual today. so you undo nuts, and then tap end of studs with drift (this is a brass bar?) and hammer. i remember smacking hub on front of hilux when replaced wheel bearing. took some beating 30mins to do whole job would be sweet

4.10/4.11 ratios are more or less interchangable, it doesn't really matter.

didnt think this would be much of an issue


Cheers
Lance

[dow50r]

Sorry Bluey
What i was saying is the lsd centre is interchangeable in the two diffs if you use the bearings that are with the lsd ctr (as toyota made changes to the sizes) Being a detroit, you could put it in the 73 centre and off you go.
This involves swapping over the ring gears and re adjusting the side gears to get correct backlash....fairly straight forward.
I have put a 73 ctr in a 80 housing, but never the other way round. Would think it will be a tight squeeze getting the larger ring gear in the housing. Might have to open it up a bit with a grinder.
Andrew

[Bluey]

i was under the impression what i have bought has ring gear fitted. or am i completely arse about here? you could be right about backlash to side gears, didnt consider this . is this hard job/possible without some special toyota tool or other.

from seller:

80 series rear diff centre fitted with Detroit locker new bearings c/w solid pinion bearing spacer set up ready to fit. will fit 40's, 55's, 60's and 75's.

Lance

[dow50r]

What this is is a diff centre not the whole carrier. You will have to put your ring gear on the detroit and set it up. You wont need the solid pinion spacer, as changing the ctr and readjusting the backlash is all that is reqd. The pinion doesnt need touching unless you have problems with it leaking or it is in need of new bearings. All you need is a dial indicator....put it together and have a diff specialist set it up 20 minutes tops to do this simple task or bring a slab over my place and i will put it in for you.
Andrew Wollongong

i was under the impression what i have bought has ring gear fitted. or am i completely arse about here? you could be right about backlash to side gears, didnt consider this . is this hard job/possible without some special toyota tool or other.

from seller:

80 series rear diff centre fitted with Detroit locker new bearings c/w solid pinion bearing spacer set up ready to fit. will fit 40's, 55's, 60's and 75's.

Lance

[Bluey]

ok, spoke to 80ute couple of days ago and was not just locker, but entire diff carrier. pinion flange thru to ring gear. this is what i thought

so, arrived yesterday and quickly did trial fit of driveshaft to pinion flange and no problems there. then drained oil, today remove axles and removed existing diff carrier and bolted in new one with locker . put in new oil and we are away again.

probably took me about 3 hours, never done this before. took round same time to undo oil filler nut

so tip for anyone else, remove oil filler nut first, then drain nut. if filler nut wont come off, at least you can still drive the car



anyway, car now drives like it is on rails, feels awesome. have noticed no noise from the locker, slight on off power tight corners. cant wait to test it out in the bush