Turbo 400 to Dana 300

[DJForrrestA]

Hi its that half scout half jeep guy again with more questions. I exploded my newly rebuilt turbo 400 and just dropped it off at the tranny shop today to have it fixed. Warranty covers all this but I figured since it would be out I'd try to swap in a lower range transfer case. I'm currently using a wagoneer Dana 20 and was wondering what was involved for me to switch that to a CJ style dana 300? Thanks in advance and P.S. I'd much rather be wheeling than tooling around in my Dodge 150 DJ van.

[J20 project]

Better talk to advance adapters, I don't think they were ever mated. Jeeps w/ D300's had 727's and 904's bolted to them.

J20

[derf]

Novak adapters makes a kit: http://www.novak-adapt.com/catalog/kit_134.htm

Advance Adapters has a kit too. No specific web page for it but you can browse through their PDF catalog at their website: www.advanceadapters.com (http://www.advanceadapters.com)

It would be a good idea to get this done while the tranny is already torn apart. It'll save you a lot of money.

[gsmikie]

i was looking at this set up the other day i think if you used the adapter from a 4L80E and the out put shaft from a short shaft th375(th350 spline ) then it would work or you could have ed moser re-spline the th400 output shaft

[DJForrrestA]

I found the Novak adapter for 400 bucks and it includes the output shaft. Yea I'll be easy while its out. I could do a direct swap for a scout 300 but they are impossible to find. I have the wagoneer output shaft in mine now but I think they are all the same? Basically 350 to turbo 400 to wagoneer Dana 20.

[grimgaunt]

go for the Novak, superior quality to the AA
Especially their sealing surface and O-rings

[scotty]

actually,you cannot swap the scout 300,if youre using a factory th400/d20 adapter,tailsahft and spudshaft. :(

the scout 300 will need either a 6 or 23 spline bull gear,and the factory th400/d20 is neither. the interal spline on the factory gear is 15 :eek:

only way to be able to use the scout 300 would be if the th400 is equipped with an aftermarket d20 tailshaft/adapter that uses a 6 spline tailsahft. if you have to buy an adapter,it doesnt make logical sense to do it that way,youd be better off buying the adapter to fit a jeep d300,wich are much more common.

using the 4L80E adapter and resplining the shaft doesnt sound like such a terrible way to go either

if it were me,id thow that slushbox in the trash and go with an sm465 or np 435. but thats just me,i dont like autos ;)

[ December 13, 2003, 06:58 AM: Message edited by: scotty ]

[gearhead77]

I run the th400 and dana 300 in my wagoneer.I bought everything from performance accesories in Mississippi.I had to install a fine spline output shaft (which had to be cut,it was to long) and an aluminum extention housing (I had to drill 6 holes, because it wasn't clocked right),then I used a thick piece of steel plate to make an adapter from the extention housing to the mount.This way the mount fit the crossmember in the factory location,sorta:)
I don't think the swap is supposed to be this involved so do your research. I am very happy with the Dana300 case. I would highly recomend it as an alternative to the quadra-trac case. I don't think I would trade a Dana 20 case though. You will probably (as I did) have to modify your driveshafts as well.

[DJForrrestA]

Thanks for the info on the scout Dana 300. I'm glad I didn't get one and find out it wouldn't fit. I'll just save up and get the adapter and try to find a Jeep Xcase when its time. I used to own a 1970 Gladiator truck and man I miss it. I bought it out of a pasture for 400 bucks with no carb just a bare intake. It had been sitting for 10 years and It was my first 4x4. I put an old 2 bbl carb on it and poured some gas in and it fired right up. Had the Buick 350 in it. Anyway thanks again guys.