Hot Rods More quick change Halibrand rear end questions

I have searched but cannot find some answers to these questions;
1. Does a quick change rear need to be vented?
2. Does fluid flow from the ring gear cavity to the small gear (quick change) cavity?

My rear is a Halibrand 301

Thanks in advance for the replies!

 

It should be vented, and yes, the lube flows between the two gear areas.

 

Thank you for the response!

 

resurrection of a older thread. Today I opened the rear cover to inspect and found that the PO had installed Winters Helical cut gears. All ok with the exception that the top gear can walk between the case and rear bearing. Is there a shim/spacer which goes on the top gear shaft> There is a spacer on the bottom shaft.

 

Yes the shims are available from Winters.

 

Helical gears are a popular upgrade on the street. They are quite a bit quieter than straight-cut ones.

Yes. If they are 1" gears, then they must use a spacer. If they are 1-3/8" gears.

The spacers are Winters 1372.

Also, make sure that the shoulder on each gear is toward the bearing.

HAMB'er GearheadsQCE is a Winter's dealer. PM him for any business dealings.

 

Thanx Gimpy

 

You're welcome.

You are here, and contributing to this community. I'd rather steer people your way, than some detached business operation.

I will be in-touch for parts, as-well, in the future.

 

One item of note, in the instructions on my Winters QC it has a reminder in large red print that says to remember to fill the back with fluid after gear changes. There are two fill plugs half way up the cover for that purpose. I would take away from that that either they do not share fluid or they do share but it drains the fluid out of the rear end below the manufactures recommendations.

 

I think that this might be a hedge against damage, resulting in a warranty claim.

The bearings are open, and there is no seal between the sections.


If you did a fast gear swap at the track, and simply dumped the correct quantity of oil back into the main section, and jammed out onto the track, the only heavy gear lube that would be in the rear section would be the quantity that managed to ooze through the bearings in that period of time.

Hardened steel gears turn to poop in seconds, without lube.

 

Good point.

 

The fluid will equalize between the two cavities. When racing you could, theoretically, drain the change gears and if you dumped the lube back into the main case and rushed back on the track, leave the change gears low on lube. I've never seen or heard of it happening in real life.

When I fill a new build, I put the lube in the main case and leave the inspection plug out of the rear cover. Takes about 10 minutes with everything at room temp. With hot grease I would suspect that it would be under 5 minutes.
That could be a problem on a 14 second pit stop.

 

I'd imagine it would only take one or two pissed-off racers to get that put into the text of the instructions.

 

If you can change gears in fourteen seconds, especially when the gears are hot after being run like that, you're a better man than I am.