jjenks0

I have a 91 4runner with the ADD. I would like to switch to manual. After reading a few of these post it sounds like if I can find a donor Toyota truck from the late 80's I can use those hubs. Is there anything else I need to buy?

Thanks.

jack

leebee

if gaskets havent been mentioned in any of the readings, youll need a set for each manual locking hub.

lee

RustBucket

iTrader: (1)

Don't get the spindle nut conversion kit, you don't need it.

Maybe get some shiny new acorn nuts for the hub!

funrunner91

dude...rustbucket, you crack me up. you told me the exact same thing when i asked this question. like a week ago

tc

Just did the manual hub conversion the other night. Best mod ever - you can actually feel the truck coasting easier! I am looking forward to seeing what happens with the gas mileage!!!

4x4Lamm

Did you use asians or warn hubs TC?

Lamm

tc

Warn Premium - got Masterwacker's since he's doing SAS.

motoracer47

dont expect much, i got 0-1/4 mile per gallon improvement.
now the electric fan mod has given me an average of about 1-1.5 mile per gallon(city not highway)

btw, all you need is the hubs, and the gaskets(if using aisin) there is a writeup in the the writeup section showing how to rebuild them, what gaskets to get, and if you want to replace the bolts, what size bolts to get.

https://www.yotatech.com/forums/show...ighlight=aisin

Silver_Truck

if you want to truly remove the add though then you need to find a drivers side axle tube from a non add diff then get the correct oil seal from your local stealer. Once you have those just pull off the old add tube press in the new seal and bolt up the new tube. Install your manual hubs and you're almost there. Trace the vacuum lines from the diff up into the eninge bay to find the vsvs then either remove those completely or just put little caps at the end where the hoses connect

RustBucket

iTrader: (1)

Good all I know is that I bought two of those kits back when I did it. I'll still fairly new to yota.

jjenks)

What do you mean if you want to truly remove the ADD? Do I need to switch tubes? I have a couple of used hubs spotted at a salvage yard. I thought I just needed to remove the ADD caps and replace them with the manual. I think the manual hubs are from a 86-90 pickup. Do I only need the drivers side? Is it a short explaination on why the tube switch is necessary?

Thanks.

Jack

Silver_Truck

if you remove the drive flanges and replace them with manual hubs you are gaining the ability to unlcok your axles from your wheels which adds live to your cvs and adds mpg (sometimes) but you're still left with ADD. The ADD system is NOT the flanges those are just the part that puts drive to the wheels. The ADD system disconnects the drivers side inner axle from the differential, hence the name Automatic disconnecting Differential. In order to eliminate this you need a non ADD axle tube which gets rid of the actuator that connects/disconnects the axle as you can see in this thread that (I think) you posted in: https://www.yotatech.com/forums/show...=add+axle+tube. You can also do it like this: http://www.4x4wire.com/toyota/tech/add/ which is cheaper and easier

leebee

in removing the add system you loose the ability to shift on the fly to and from 4x. keep the above mentioned aritcles in your favourites section, wheel with the manual locking hubs and your current add system for now. if you feel the need to eliminate the add system in the future, you can revisit those articles and give it a go. either way, you will have gained some mechanical work experience and maybe, saved yourself some money.

i cant believe i just said 'save money' on a toyota modding site! i must be suffering from cabin fever.

lee

jjenks)

Do you gain any thing from removing the ADD? What are the advantages? I like the idea of shifting in and out on the fly with hubs locked in. I am going with the manuals because of gas mileage. This is some great information. Thanks to you all!!!!

Jack

leebee

you wont notice much if any difference in fuel economy. ive had my manual locking hubs on for a year and a half and keep pretty good records of km's driven and fuel burned. the weather will play a more significant role in fuel economy than any thing else.

lee

Silver_Truck

the only thing you gain is some reliability if you wheel hard because you eliminate the change of pulling out or tearing the vacuum hoses etc. most of us still have our add though and just run manual hubs. I'm going to get rid of it once it fails

jjenks0

Thanks for the great info. Im I correct that 86 -90 hubs from a pu will bolt to this 91 4runner?

Jack

Robinhood150

Per the 4x4wire article: