Tekkernickel question....
 

Anyone know if the pinion in a 3.78 rear (9-34) is the same as the pinion in a 4.11 (9-37). I wondered if maybe the teeth are smaller to accomodate the extra ring teeth? Just curious.
Marty.

Re: Tekkernickel question....
 

Not the same pitch diameter. They won't interchange.

Re: Tekkernickel question....
 

That's an interesting question. Thinking of the variables of tooth sizes and gear diameters, the answer may be different for different ratios. One thing i can tell you is that they are machined in matching sets, with etched serial numbers.

Re: Tekkernickel question....
 

Ah... that's what I suspected, and I suppose is quite logical when I think about it.

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I'm sure thay were a matched set when new nut I remember early 50 when I was a young teenager we would pull one axel housing and pull the axels and ring gear, put another ring gear on (differant ratio) put it back together and drive the s--t out of it. They always worked fine. Walt

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Hahaha.... I love stories like this.

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Even in the 60s, been there done that. The gears may might sing a little bit. So what!! At least it went down the road.

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Hopefully none of those rear ends have made it out to the west coast . . . hmm

Re: Tekkernickel question....
 

I've heard of mixing ring and pinions from matched sets of the same ratio but not too many success stories of mixing those parts from different ratios and actually driving very far with those mismatched gear ratios :)

Also, I question if Ford actually 'machined matched gear sets' persa...what they most likely did was pre lap grind pre-machined ring and pinion gears together in some type of fixture to better match their tooth profile and then mark them as a matched set for assembly in the same rear. At least this is how the company I worked for matched gear sets in products that had critical specs for allowable gear noise.

Re: Tekkernickel question....
 

They made pinions on one machine (several actually). They made ring gears on another set of machines. They were "matched" insofar as a set was marked as a set when installed. This was for reference later if service was needed.
They were not lapped but merely adjusted for proper clearances when installed. Machining tolerances were every bit as good as they are today.

Re: Tekkernickel question....
 

The Way of the Zephyr (LZOC newsletter) published a factory photo of a ring and pinion being lapped in on a machine. Maybe only the Lincoln had this luxury .

Re: Tekkernickel question....
 

OK, I never posted the following... One of my heaps has a ring gear from one junk pile, and a pinion from another junk pile. The only care I took... Both are Ford script, and I was VERY careful with assembly, meaning NO short-cuts, everything double (or triple) checked, including final pattern. I've got several thousand miles on it, no noise, no bad habits, no problems. Matching etched numbers... No. And, in response to a previous post, I am from Pasadena. The pinion was ground (for late-early mod) by an excellent flathead guy in Monrovia.

ps... I wondered about the 9-34 vs 9-37 pinion, too. I compared my junk pinion to a known 'good' one that a friend had, and I've forgotten what I learned from that - so no help there. Then, I realized that I knew where my junk pinion came from, and I knew it was originally a 9-34.

Re: Tekkernickel question....
 

Hah, Bob, I was joking! And thanks again for those pages out of the Green Bible you sent me!

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Re: Tekkernickel question....
 

It's a new process for replating original Model A radiator shells. :D

Re: Tekkernickel question....
 

you guys over the ditch dont know what a TEKKERNICKEL IS ????????????!!!!!!! HA HA COULDNT RESIST MATE,,,,,,,,,,,