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Well, after reading over and over again that all ford gearsets are the same.....blah, blah, blah.....I wasn't convinced. I tried the "nominal" .030" pinion shim, which everyone says should only vary plus or minus .002" and the pinon was too shallow. I ended up setting it up with a .024" pinon shim and set the backlash to .010". Here are the pics with that setup.

The drive side...


and the coast side...


That's a good pattern, and it wasn't acheived by "using the same shims" or "just using a .030" pinion shim" because it was a Ford gearset. The moral is...there is no substitute for proper setup. Don't believe everything you read on the internet.

Anyway, this rear is buttoned up now, and I think it might have to go in this weekend... :thumbsup:

Mike
 

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Toombs said:
Well, after reading over and over again that all ford gearsets are the same.....blah, blah, blah.....I wasn't convinced. I tried the "nominal" .030" pinion shim, which everyone says should only vary plus or minus .002" and the pinion was too shallow. I ended up setting it up with a .024" pinion shim and set the backlash to .010".
Whoever is saying that doesn't know jack about differentials!! :leftright

Nobody I have ever talked to about setting up ring and pinions has ever said that. They all say, "It has to be shimmed, you can't just throw shims in there and have it "right". It will "work", but not for long and/or be loud”. :beek:

Yeah, sometimes the Internet has some really crappy information! :redmad:

Thanks for posting that. :thumbsup:
 

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Well, you just posted what I've been trying to tell people for years...... But there are still people who thing that they can set up their own gears in the garage, because they are mechanically inclined. Simply not true.
 

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you CAN setup your own gears in your garage if your mechanically inclined, you just need a dial indicator and a cheap hand operated 10ton press. :D
 

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When I did my 3.73's I measured the pinions (new and old) and the bearings (new and old). All of the above were FMS pieces, and the total variation in them was like .001-.002" together. I decided to reuse the shim from the old pinion since changing to anything else would have changed the total height too much. Come to think of it, IIRC it was a .030" shim. The backlash of course had to be done from scratch, but once I got that dialed in and I checked the wear pattern, it was right on. Most of the time it works this way, but not for all. People who do gears should always measure before they start slapping parts together.
 

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This is an excellent post. I am very mechanically inclined, but I do not, nor would I ever pretend to know how to set up a rear end. I would take it to a shop who does, or to my buddy for his expertise(he build race 9" rear ends, narrows them, cuts them, whatever)...but after seeing this thread, with pics to explain what we all read (heel, toe, pitch, backlash, etc)...if you havent seen pics, those words mean NOTHING.

very nice job...and thats exactly what the pattern on my 90 Mustang looked like when we slapped 3.73's in it.

its as if you guys are mind readers...I like to see new info...before I even have to ask or search.
 
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