Quadratrac axles

Would it be possible to switch the D25/27 and D44 in an ECJ5 with those from a CJ7 with the turbo350/quadratrac setup? Or is that maybe a dumb idea with the F134 engine?:hurrican:

 

First, you alreay know anything is possible with a jeep. Yes, the swap should work. CJ7’s had a few different axle configurations that appeal to different folks for different reasons. I currently have a set of Wide Track axles (which were from 82-86 CJs) under my ECJ5. The extra width is what I wanted – stability and improved turning radius. Some opt for the Narrow Track axles from the earlier year CJ7’s and later model 5's.

If the axles are from a quadratrack 7, then they are likely the narrow track (which would be near the width you have now – others on the board can tell you how close – I think the D30 narrow track front is a bit wider than the D25/27 you have – I just haven’t committed those types of specs to memory). And if memory serves, I think the rear AMC 20 used in QT set ups were offset..? If so, you’ll want to make sure things line up with the Tcase you plan to use. Maybe it will work with the d18 if that is what you plan to keep.

There are some minor mods you will need to do with the swap – possibly spring perches in the rear, brake lines, drive shaft fitment maybe, etc. – but all minor in my opinion.

 

It's a TH400. Jeep never used the TH350.

Sure you could, but the rear axle is a AMC 20, which everybody hates. Plus I expect the original gear ratios won't be to your or the F134's liking. Doubtful you could get 4.10s with an automatic, probably only 3.54s or worse.

 

Timgr brings up a great point about gearing that I shoud have addressed. I bet they are 3.54's. But don't let the AMC 20 scare you off. I know they aren't the most popular (use that to your buying advantage) but they can be upgraded to be respectful. I have a 20 now. uprgraded shafts. But I'll admit, I am on the lookout for a widetrack d44 (they had 'em in '86 CJs)...

 

Jim (jpflat2a) wrote in a previous post that the 20 will last just fine if you keep the axle nuts tight. The main complaints about them are that the axles spin in the hubs, and that the tubes are weak. For a F134, I'm sure they would be more than strong enough.

 

be aware that replacement axle shafts will be hard to find (if you break or spin one).
Aftermarket is junk (std axle) and the Q-trac was only used for 4 years; the offset is different with the Qtrac Model 20 than the other Model 20s; just something to think about.

 

No jumping it? Darn, there goes that record breaking leap over the Grand Canyon next year.

I was thinking on matching them to the D18. The offset is to the passenger side with both t/c's.

The gearing will be a problem probably. Research indicates the 60 to 70 horsepower from the F-134 isn't enough for anything lower than about 4.03. Which is what it would be as a final drive ratio with the overdrive engaged. I don't have the overdrive, however. Was considering the switch to take advantage of the better braking and slightly wider stance.:hurrican:

 

I'm not sure this is any help, and maybe I shouldn't mention it here (please let me know if I screwed up!), but I have what I believe is a Q-trac axle, with pinion yoke pass side drop, centered housing, one-piece axles that I will be pulling for WT axles. The axle tubes are about 15" each. It is a D44. It is in my 79 CJ5 (the PO installed it). I haven't positively IDed it yet, however. It is geared 3.73.