T18/d20-d18 gear swap

So can you swap a d18 gear set with the 6 spline bull gear into a d20 case behind a T18?? If you do can you still get the 2wd f/r hi/lo options??

 

I know the bull gear will swap; I've got a T-90 bull gear bolted onto my T-18 right now. I've read articles saying that the rest of the gearset swaps, but I'm not sure exactly how it's done. I think Dummy did something of that nature in his flattie.

 

Well I havnt decided which out put I'm gonna run, got 2 sets of d44s to pick from, one being a centered rear and one being offset. I was thinking going with the centered for future potential changes, but thinking about it more I may just put the d18 behind the t18 and run the offset axles. (chomolys are cheaper ) Plus the idea of having the twin stickd 20 and the possibility of having the front/rear in different hi/lo ranges scares me...Dont need that to worry about.. For the dshaft angle I had planned on running a CV anyhow, got some laying around the shop will only need to be shortened.

 

This guy makes a kit with new shift rails that do allow it..


http://home.windstream.net/ezduzit/twin20.htm

 

I have the 18 in gold twinsticked now, and it does come in handy to dissengage to make a turn. Also its just the fun factor of having the option to.....all about the options

For some reason I thought you could get it to front only.. But it makes sense that you cant since the one rail only engages/disengages the front and the other is the range selector..

 

Went back and read on the site some and with his kit you can get a front 2 hi but not 2lo. With the d300 you can get a front 2lo but not 2 hi..... Not sure if I would ever use it but there might be that one time

 

nothing......quit being nosey




Its actually for a customer here at the shop that asked me to do some research for him. I thought I would be able to find it searching here but couldnt so figured Id start a thread about it.


So this brings another question.....

If the 20 shift rails can be adapted to allow a Front 2hi can the 18 be adapted the same way?? Ohhh Nickmil????

 

me too but that site selling the kit above seems pretty clear that you can :?

 

Nope. 'fraid not. The 18 uses a simple clutch to engage and disengage the front output. The 20 uses a slider to engage/disengage sets of gears which is why you can get front only with the 20 but not with the 18. Nickmil

 

Thanks Dan! R) Nickmil

 

Thanks, Nick

So if I have a small hole D18 I'll need to find a large hole case to swap the gears to a 20 case along with the EB bull gear.

 

If you are trying to make a 2.46-1 low range 20 (stock is 2.03) then you need the following:
Large hole 20 case
18-8-22 gear
18-8-24 gear
18-5-9 intermediate gear
These can be had from the early T-shift (6 cylinder) bronco case or any 29 tooth model 18 Jeep or Scout transfer case regardless whether it is small or large hole. Unless the gears have been changed an easy way to tell a 29 tooth transfer case is it has the 1 1/4" intermediate shaft. The 26 tooth ones I've seen have all been 1 1/8".
You will also need from the early Bronco T-shift (6 cylinder) bronco case:
18-8-37 slider gear

The bull gear can be used from either the 18 transfer case:
18-8-23
or from the same bronco case you got the slider from:
18-8-33
I'd recommend the Jeep bull gear as the bronco one does not have the recess in it for the washer and nut and in some applications the recess must be machined in so the nut has full contact on the threads and does not interfere with PTO's or rear output shafts. Hope this clears up any confusion. Nickmil

Oh, yeah, the 20 case will need some grinding on the inside to clear the Bronco sliding gear to be able to shift in all the gears. Nickmil

 

I'm currently looking for this gear, would the years fall between 1966-72?

 

FYI: It is possible to get indpendent control of each axle on a Dana 20 T-case. It requires the removal of the shift interlock pills between the shift rails. With these removed It is possible to put one axle in high and the other in low.

In the 2.5 years I have had mine this way I have messed up twice. Both times I was sitting still. I have used 2 low RWD as well as 2 HI Front WD and 2 LO Front WD on occasions. It is nice to have that functionality. Just be very carefull when shifting the t-case. Of course to use this functionality you need to have converted the case to twin stick operation.