Power-Lok limited slip in Dana 25

O.K but that makes no sense to me if the Powr Lok was correctly set up.

Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963)
Zero aftermarket parts

Contacted Herm just to see if he'd sell a spacer ala carte from the kit. He said no. I can understand as he probably can make more piecing together and selling the kit as a whole.

PHOTO DIARY OF MY BUILD

I've only actually driven this thing probably a dozen times since adding the Powerlok, but it does turn easier with the hubs unlocked even in 2WD. That doesn't make sense, I know. With the front drive shaft NOT turning under power, the steering should be the same whether the hubs are locked or not, but takes more effort and the turning radius is slightly less. Both negatives are much more noticeable in 4WD.

'48 CJ2A

'56 DJ3A

'79 CJ7

And two of them actually run!

bobevans wrote:

I've only actually driven this thing probably a dozen times since adding the Powerlok, but it does turn easier with the hubs unlocked even in 2WD. That doesn't make sense, I know. With the front drive shaft NOT turning under power, the steering should be the same whether the hubs are locked or not, but takes more effort and the turning radius is slightly less. Both negatives are much more noticeable in 4WD.

That behavior is quite normal with a posi. Think about it - when the hubs are locked, the L and R wheels are connected - trying to turn the same speed. In a corner the L and R want to turn at different speeds - fighting the friction of the posi. The effect is amplified under power. So what you're experiencing lock vs. unlock is not unusual regardless of the t-case position.

46 CJ2a rockcrawler
46 CJ2a - 26819
46 Bantam T3c "4366"
47 Bantam T3C - 11800
68-ish CJ5

Willys Bearing Chart

https://www.cj3b.info/Tech/Bearings.html

Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963)
Zero aftermarket parts

nofender wrote:

bobevans wrote:

I've only actually driven this thing probably a dozen times since adding the Powerlok, but it does turn easier with the hubs unlocked even in 2WD. That doesn't make sense, I know. With the front drive shaft NOT turning under power, the steering should be the same whether the hubs are locked or not, but takes more effort and the turning radius is slightly less. Both negatives are much more noticeable in 4WD.

That behavior is quite normal with a posi. Think about it - when the hubs are locked, the L and R wheels are connected - trying to turn the same speed. In a corner the L and R want to turn at different speeds - fighting the friction of the posi. The effect is amplified under power. So what you're experiencing lock vs. unlock is not unusual regardless of the t-case position.

nofender has it right. Clutch-type limited slips (like Powerlock) are always trying to keep the two sides turning the same speed. With the hubs locked you will be fighting that whether the transfer case is in 4WD or not and whether you are moving or not.

This is not the case with automatic lockers, including lunchbox lockers like LockRight. They unlock to allow the two sides to turn different speeds.

It's also not true of TrueTrac gear-type limited slips (not that those are available for Dana 25s...). They allow free differentiating.

Bob

Flatfender wannabe
'71 Ford Bronco

Stev,
I did put the friction modifier in the axle.

outlw21,
The cones were LM501349. I included a picture of them earlier in the write up. I ended up using the cups that came in Herm's kit.

'48 CJ2A

'56 DJ3A

'79 CJ7

And two of them actually run!

Thanks for the bearing number information. I also bought a couple of the surplus power locks from QTM and am going to make my own spacers. Going to use NAS6606 bolts for the ring gear.

I know this is an old thread but, I’m wondering if your powr lok has loosened up any. I rebuilt one for my Dana 27 and this thing don’t turn for crap. Hubs locked and in 2 or 4 it’s got the turning radius of a dump truck. A big dump truck. Really disappointed so far.