That ought to make you a great rear axle assembly. The pinion on 9" are lower to begin with that almost any other. If you're doing a spring over you going to have some serious driveshaft angle to deal with. I'd go high pinion if I had to have that much lift.

Yes on the 31 spline.

Detroit True Trac would be ideal for what you descibe in doing. They have many great reports right here on this site!

 

but doesn't a hp weaken the rear but is better on the front i have a lp on there now with the amc 20 and its been fine for now is there anything else i can do b/c hp is 1600 dollars ouch!!!!!!!!!!!

 

Currie says that high pinions are not as strong as standard. Guess you could lower the transfer case. Tell me about the cost. I've been shopping for all of that stuff for my 9".

 

High pinion if you have the $$$ although I have no issues with mine being a low pinion (spring under)

31 spline or more, if your doing it why not a 40 spline

Detroit True Track since most of the drivning is on the road.

 

here is a pic, i hope i can load it of the angle of the drive shaft. currie 3rd member with all the fixins is 1600 dollars. i dont want to pay that. New axles 31 spline 250.....bronco graveyard for all stuff, tru trac... 450....4.10 gears.....185, instal gear kit,...50 totals 950 so in bad *** axle for 1000 bucks

 

here the jeep that im getting ready for the trail the 9" will be a god send over the amc 20 even though the 20 and 30 are in great shape

 

one more.... im changing those 38 specials to 35's this was my trial pic to see if they looked too small, i thought they actually looked better.

 

Very nice looking rig you have.:thumbsup:

 

thanks jim .... so do you think the low pinion will be ok for me

 

An idea may be to go with the low pinion and double cardan u-joints, which you have, to see how it works. You might be able to shim the rear axle pointing the pinion up some to help too. If that fails you could lower the transfer case a couple of inches. That would keep you away from the high pinion. I'm sure there will be other ideas on this. One thing to consider is that the Ford 9" pinion will be about 2 1/2" to 3" lower than where it is now so if you have trouble now you most likely will later.

 

Hey O.P, what eventually happened here??

 

Wide track dana 30/ AMC 20 rear
Super 30 upgrade up front
Large spline axle upgrade rear
ARB lockers front/rear
4.10 gears.......needed to be lower (4.56 or 4.88)
ROCK SOLID

 

Oh you abandoned the ford 9 swap?

 

Yes. 8- 9" of lift was way too high for a lower pinion ford 9"