Thread: No drive on Hi Ratio RWD

Originally Posted by geodon

----- Just did the one rear wheel down, park brake on test & BOTH wheels turn! Something has let go in the diff for sure.

Looks like I have to get intimate with an ENV diff! Those diff's look tough as old boots.


BTW, what thread is used for the TC sump bolts? Most screwed right out & I want to clean them up with a die & tap. The coarse end into the case seems like 1/4 BSW. Is the nut end 1/4 BSF?

Could be either BSW / BSF or NC / NF, not sure what year the change over occurred.

The early ( Series One ) transfer boxes were definitely BSW / BSF.
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It is probably UNF, as I note that the Series 3 lists the same part No as 2a, which suggests the change was before Series 2a. But even if this reasoning is correct, there is no guarantee that earlier parts have not been fitted some tim in the last fifty or so years. Check which it is with a known nut, and be aware that there is no guarantee they are all the same!

John

If an axle is broken at the diff, for example, that wheel will obviously spin with the park brake on & the good wheel on the ground.


I have no argument with that.


With the bad wheel on the ground & the brake on it's argued that the good wheel will not turn presumably because it will try to turn the propshaft.


I can't see that.

If no axles are broken and both wheels are in the air, then turning one wheel will cause the other to turn in the opposite direction. That's what diffs do. So, with the bad wheel on the ground, turning the good wheel will just spin the broken halfshaft in the opposite direction thus offering no resistance to turning.


The only way to test is to pull both axle out & look at them.


I'm not complaining! I was delighted to see this:


(BTW those TC sump studs were 1/4 BSW & 1/4 BSF 26 pitch)

Well, I guess you have found the problem. Now all you have to do is get the bit out of the diff!

John