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How big of a job is it to replace bearings, seals and posi clutches in a 1969 differential? Thanks for any input
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Re: rear differential
Greg - I have done about 4 to date, and several other ring and pinion setups before that. Many folks shy away, but, if you are mechanically adept and are willing to learn and take the time I don't consider it that difficult, if you know the ropes. I have a bunch of notes from two rear end classes from Charlie Smith at Bloomington Gold over the years, I have taken both his short class and the in depth 5 hour hands on. He has lots and lots of little tips that make the job easier. The part I dislike the most is removal of the carrier from the car....the sombrero mounts can be tricky when rusted on for 30+ years, but they will pry off. As Joe says, use the green crowbar from Orchard supply...which translates into a large crowbar. I also used longer bolts through the sombrero mounts to catch the crossmember and carrier when it does pop loose, just a safety measure. Of course, you have to be careful removing and reinstalling the rear spring, dearching before tighteing the bolts on the rear cover to prevent ear breakage. I would be willing to discuss all of this on the phone if you wish....Craig -
Re: rear differential
Greg, I consider myself very mechanically adept at the big stuff, but I have pulled the differential on three Corvettes and had them rebuilt by the professionals. Each car was only going to have one rebuild in its life so I had someone with the knowledge, the tools, and the prior experience do my work. No regrets.
GaryComment
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Re: rear differential
I'll second Gary on that one.
Kinda like putting together a gas barbeque from Home Depot with your stomach growling only to find out that one too many spacers ruined a good meal!
JimComment
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Re: rear differential
Jim and Gary are correct. Regardless of how mechanically inclined you might be, if you have not had experience at setting up either helical or even straight bevel gear sets, and know how to read the gear mesh pattern, and do not posess the correct tools, i.e. inch pound torque wrench, I would not advise trying this "at home", so to speak. You'll be much happier having a professional do it.
LonnieComment
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Re: rear differential
The job isn't hideous, but it's tricky and requires BOTH knowledge/skill and special tools. We've done this as a Tech Session workshop activity at our Chapter about six times now.
Having a 'spreader' tool to open the case to get the carrier in/out is one consideration. The second is being able to read gear mesh patterns and select & install PROPER shims to get internal geometry right (put 'er on the money) is the second consideration.
Suboptimizing by doing a generic overhaul that 'works' but isn't 'on the money' is typical. Will 'work' but won't be as designers intended or give the best useful life/performance profile.
Why not make queries around your local NCRS chapter to see if fellow members have the tools/knowledge to lend a hand and help you? I CAN say, that once you've been done the learning curve under the watchful eye of an experienced pro, it's GREAT to know the job has been done RIGHT!!!!!Comment
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Re: rear differential
This is the approach I took, I used to shy away and fear helical gear setup. but, after learing the ropes, taking classes, etc at Bloomington, I find this very rewarding. And, as the end user, I take the time to be meticulous and set the gear patterns, backlash, clutch plate shims, etc, up to exacting tolerances. Once you have completed a few, it gets easier, faster, and you learn more about tricks. I found Charley Smith's classes invaluable for this operation....CraigComment
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Re: rear differential
Part of the fun of it for me is the actual hands on work. I have no fear of gears or reading patterns. It is like anything else, you learn by doing.
As long as you have a good guide (reference, mentor, old pro), and you can ask questions, then why not.
I do ALL of my own work.
Al CorelliComment
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Re: rear differential
Al - a man after my thinking. I do my own body and paint work too...CraigComment
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