Worm gear for a 68 2000

[Ted928]

At some point I would like to tighten-up my steering. When I adjust the box to take all the slop out while pointing straight ahead, the steering binds when I try to turn it. I think that means that the worm gear is worn.

What are my options to repair or replace?

Thanks

[dbrick]

Best option I know of is to swap it to a type B box, recirculating ball type but a bunch of parts are needed, U joint, lower shaft and maybe the idler box. Getting the whole assembly from a parts car is the best bet.

You could try re-adjusting the existing box a bit looser to find a happy medium and using 140 wt conventional gear oil, thicker film of oil may help a bit, unless it's excessively worn on center. A wheel alignment afterward will make it track better, so the play may not be as annoying.

[sfdaugherty]

There's a writeup on updating to the recirculating ball type in WIKI section. These came out mid to late 1969 but, according to the article, you will need the u-joint (which is smaller), a steering box, and will have to bend some metal. I don't think you need more than that if you have the late model, two-piece steering column.

Although I'm not having problems with mine, the rebuilt boxes and parts to repair them are getting VERY costly so I bought two boxes on ebay (one of each kind for my 68 and 69) and some extra u-joints (just in case I decide to upgrade my 68).

Shannon

[Ted928]

Is rebuilding the ball type much cheaper or is it that they do not wear out?

[dbrick]

The multiple balls in the system spread out the wear, so they last longer and stay tighter. I would watch for a box from a low mileage rustout. As long as there's oil in it, they weather well.
I'm 99% sure you need the lower shaft to change to the late box, different spline count.

I was thinking, as long as you don't drive in very cold weather, you may have nothing to loose by filling the box either 50/50 or 100% with STP oil treatment, thick and very slippery, but it flows. If you decide to drain it out, might take a few days to all run out.

[sfdaugherty]

I'm 99% sure you need the lower shaft to change to the late box, different spline count

Dave: I'll compare mine and see if that's true. If so, I'll need one more part to do the swap.

Ted928: I thought that one of the vendors sold new worm gears but, when I looked I couldn't find it.

Shannon

[23yrRebuild]

I upgraded to the RCB in my '67. IMHO, it was a worthy upgrade and I like it alot.

[garth]

Ok. I've got the newer RC box. Where can I get the matching U joint? I understand it is one of the hardest parts to replace. I asked Ross today if he had one. "Nope, got 40 of the older type though" Not very encouraging!

So if anyone wants to part with one, please pm me.

[sfdaugherty]

I'm 99% sure you need the lower shaft to change to the late box, different spline count

Dave: You were right, the worm gear splines are much larger than the RB splines. Rats! Now I have to keep an eye on ebay for the lower steering section if I ever want to do the swap.

Here's a couple shots of the two different boxes. The older worm gear style is the one with the bolts in it still.

Shannon

[Ted928]

Has anyone tried to weld repair their worm gear????

[garth]

Ted,

When I discovered my worm gear had a chunk missing out of the "worm" I took into the weld shop where I worked to see if a weld repair was possible. I cleaned it up and did a dye penetrate test which revealed numerous cracks that would have to be repaired in addition to building up the missing chunk. Diagnosis complete: Not worth repairing. Even without the cracks, building up the damaged area would require some special welding techniques and post heat treatment to restore hardness, both expensive and risky processes. The worm gear faces are case hardened steel for the extreme loading steering forces generate.

Repaired steering mechanisms are likely to fail at the worst possible circumstances similar to repaired braking systems. Be safe and find an alternative solution.

BTW I was at Ross Mullen's tonight picking up some parts and I noticed 8 or 9 damaged worm gears sitting on a shelf beside several used steering units so its a common failure and repacement as the common fix.

[Ted928]

Unfortunately, you make a lot of good points. What are the options?? What do all the racers use for a steering box?

[dbrick]

Ok. I've got the newer RC box. Where can I get the matching U joint? I understand it is one of the hardest parts to replace. I asked Ross today if he had one. "Nope, got 40 of the older type though" Not very encouraging!

So if anyone wants to part with one, please pm me.

They basically don't exist. I tried to get them fabricated a few years ago, got a sample of the new one, and they kept the stock one I sent them, which I borrowed from Michael Spreadbury. Took me 2 or 3 years to find a replacement to send back to him. Sample is my spare, but would need to be tack welded in.

Best solution would be a sleeve or a yoke to enable using the old style larger joint on the later box. I forgot which is the smaller shaft size.

Craig Halstead just listed one, nice part, but it's not cheap. http://cgi.ebay.com/ebaymotors/Datsun-1 ... 0376710047 See if he has a lower shaft if you contact him.

[Dcyco1]

I'm 99% sure you need the lower shaft to change to the late box, different spline count

Dave: You were right, the worm gear splines are much larger than the RB splines. Rats! Now I have to keep an eye on ebay for the lower steering section if I ever want to do the swap.

Here's a couple shots of the two different boxes. The older worm gear style is the one with the bolts in it still.

Shannon

I have the one on the bottom, the smaller shaft, sitting in my gararage.

[Ted928]

I'm 99% sure you need the lower shaft to change to the late box, different spline count

Dave: You were right, the worm gear splines are much larger than the RB splines. Rats! Now I have to keep an eye on ebay for the lower steering section if I ever want to do the swap.

Here's a couple shots of the two different boxes. The older worm gear style is the one with the bolts in it still.

Shannon

I have the one on the bottom, the smaller shaft, sitting in my gararage.

pm sent