I finally go my dual cases in, but I was curious what others cut their driveshaft lengths to. I am also putting in a rear trail-gear 5" lift (this is all on an SAS 86 4Runner). I called trail-gear, and they recommended that I NOT put a double cardan in the rear, and I asked them twice about it. This is fine with me as I rather run a standard ujoint at both ends. What I'm getting at, did most just cut their rear driveshaft 6.5" (the extra length of the doubler)? I wanna get this truck ready as soon as possible and thought I could get the shaft cut down while I put the rear lift in next week.

Or could I just measure to the stock distance on the rear pinion and that would be ok even with a 5" lift? Thanks for the help.

 

I would do the CV joint in the rear shaft, I tried a u-joint shaft on my '85/dual case setup and could not get it running smooth with the shaft angle of ~15 degrees. With CV it was a lot better:
- http://www.4crawler.com/4x4/CheapTri...l#Measurements

Marlin also now recommends CV rear shaft with dual cases on SWB rigs.

I think I have something in the 39.5" flange-flange at rest with a couple of inches of slip yoke pulled out, but best to measure once everything is set up. You could approximate the distance with the lift by dropping down from the existing pinion flange location, but won't change all that much.

 

X2...

 

x3

 

I would definitely go with the CV shaft and the pinion pointed at the tcase.

- better ground clearance under the pinion
- smoother operation of the dual cases. There are many reports that the common "chatter" from the dual cases is a symptom of non-optimal DS setup. I know mine has been a TON better since extending the wheelbase 1.5", and AxleIke said his is practically quiet now that he's gone to a double cardan DS.

 

Thanks for the info, I don't know why trail gear is recommending not to use a cv shaft.

 

I've been running my rear d-shaft with double cardan joint since I did my SAS.

 

Install everything then measure for your d-shafts.

I have a dc rear d-shaft and I would do it no other way.

70+ mph and no vibrations.

Measure then cut.