Do you think this R & P is okay ?

H

Hank the 36

Member
I'm a little nervous about the pitting. Any good comments are appreciated.

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I installed a ring and pinion that was not pitted quite as bad as yours, and it was Very NOISY. :(













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I agree. See if at least the etched numbers match? Depends on your budget and your willingness to do the job over again when you get tired of the noise.
 
Based on what i can see in those pictures the profile of the gear teeth on both the ring and pinion looks good to me. It looks like mostly surface rust on the ring that will clean off. I don't believe the amount of pitting on the pinion teeth would cause any problems based on the way those gear teeth will come in contact in actual operation. Those pits may actually help keep some lube on the gears as they mesh. The ring appears to have 34 teeth and the pinion most likely has 9 teeth making that a set of 3.78:1 gears. Can't see the driveshaft end of the pinion gear, but if it has 10 splines that would be a highly desirable R&P set for early V8's with closed tubular type drive shafts. I have a matched set of 3.54:1 R&P gears that have pitting worse than yours and i am planning to use them in one of my cars. Pitted gears does not necessarily = noisy gears. There are many other factors which will create gear noise. IMHO, I would not hesitate to use those gears and if that is a ten spline pinion I would consider buying those gears from you if you decide not to use them.
 
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JM 35 Sedan said:
Based on what i can see in those pictures the profile of the gear teeth on both the ring and pinion looks good to me. It looks like mostly surface rust on the ring that will clean off. I don't believe the amount of pitting on the pinion teeth would cause any problems based on the way those gear teeth will come in contact in actual operation. Those pits may actually help keep some lube on the gears as they mesh. The ring appears to have 34 teeth and the pinion most likely has 9 teeth making that a set of 3.78:1 gears. Can't see the driveshaft end of the pinion gear, but if it has 10 splines that would be a highly desirable R&P set for early V8's with closed tubular type drive shafts. I have a matched set of 3.54:1 R&P gears that have pitting worse than yours and i am planning to use them in one of my cars. Pitted gears does not necessarily = noisy gears. There are many other factors which will create gear noise. IMHO, I would not hesitate to use those gears and if that is a ten spline pinion I would consider buying those gears from you if you decide not to use them.
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Thanks for all of the comments. I'm wondering what makes the noise ??? I'm going to clean these up and show them to a local buddy of mine and see what he thinks. John your 100% right about the ratio, and they are 10 spine. My plan is to replace the 4.11 gears in my '36. If these are too pitted at least I didn't pay a arm and a leg for them.
Thanks,
H36
 
I agree with the majority of the replies thus far.
i would not think to install those gears...
 
Hank the 36 said:
Thanks for all of the comments. I'm wondering what makes the noise ??? I'm going to clean these up and show them to a local buddy of mine and see what he thinks. John your 100% right about the ratio, and they are 10 spine. My plan is to replace the 4.11 gears in my '36. If these are too pitted at least I didn't pay a arm and a leg for them.
Thanks,
H36
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Noise comes from excessive clearance at the pitch angle / diameter.
Sanding away pits will add to the clearance. More clearance = more noise.
 
Clean it up ,use book to set it up correctly ,you should have no problems,the heavy rear end oil will smooth things out
 
Butch, the tolerance on R&P sets is so close that they were machined in matched pairs. Confirm this by the fact that every set was etched with a matching serial number. There is no way that a hand sanding job could possibly improve or make up for pitting, and in fact, the problem would be worse after the polish job.
 
i heard of a bus co in the 50 s that replaced the gears in the ford gear box's often.all they could get was a 44 gal drum of rusty gears ,after buffing them up they fitted them. They got a greater mileage than new gears ,put it down to holding oil in the pitting .
 
In the old days someone trying to sell a car with noisy rear end would load it with saw dust to quiet it down for the sale.:eek:

No, not recommending it. Don't do it. Just joking around.:rolleyes:
 
I would only run those gears if I had a really good radio that could play VERY loud! Those pits wil make it howl like a banshee!
 
ford38v8 said:
Butch, the tolerance on R&P sets is so close that they were machined in matched pairs. Confirm this by the fact that every set was etched with a matching serial number. There is no way that a hand sanding job could possibly improve or make up for pitting, and in fact, the problem would be worse after the polish job.
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Alan, you are of course 100% correct.
A couple that posted here that sanding them down, etc. will work, well, yes, it'll work.
It comes down to (once again) whether or not the fellow wants it simply to get him down the road or actually wants the car to operate as intended. That is, smooth and quiet.
I doubt the old bus companies cared whether or not the differential howled. More likely is they wanted the buses to go down the road... period.
Saw dust? Yep - I saw it once in a 1950 Chevy. It quiets for a very short time.
 
I would not use them. Especially the pinion is bad. You lose the hard face with that much pitting. With as much labor needed to setup a rear end, I would not want to do it twice if I didn't have to. Find someone looking for 3:54 gear set and you will find a good deal on a used set of 3:78s. That is what I did. A Barner gave me a great deal.
 
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Been doing this deal for 40 years and every time I've tried to cut corners by sanding gears or just plain running some with pits it's come back to bite me. No pitted gears get used in my shop!
 
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Your lucky,JM said he would buy them from you,take the money and look for worthwhile ones. I have had better looking ones then this I could not sell or give away.
 
Some of this discussion reminds me of how old bailing wire farmers & ranchers would put stuff together to get them through another harvest or two so they could afford to go back to the salvage yard and get another rear axle.

They will work as long as all the teeth are still there. Now whether they work "well" or not is a whole nother story altogether.
 
Put a magnet on the fill plug, whether you run your gears or another set... That will help remove iron from the oil, cut down on wear and also give a clew as to what's going on...
Karl
 
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