gear installation
05-12-2010, 08:19 AM
#11
2nd Gear Member
Join Date: Dec 2009
Location: Florida
Posts: 198
Yep.
"Days" to do a gear install? Shouldn't take more than about 3 hours. At least they are willing to try and get it right. There are many gear installers but not as many who know what their actually doing. Don't fear the gear!
05-12-2010, 06:40 PM
#12
Join Date: Apr 2009
Location: Illinois
Posts: 42
Then the "professional" didn't know what they were doing or just didn't care IMHO.
Yep.
"Days" to do a gear install? Shouldn't take more than about 3 hours. At least they are willing to try and get it right. There are many gear installers but not as many who know what their actually doing. Don't fear the gear!
Yep.
"Days" to do a gear install? Shouldn't take more than about 3 hours. At least they are willing to try and get it right. There are many gear installers but not as many who know what their actually doing. Don't fear the gear!
I think the biggest issue is not being able to set the pinon deep enough. With no shim, is there any way to reduce the depth?
05-13-2010, 12:03 AM
#14
2nd Gear Member
Join Date: Nov 2008
Location: texas
Posts: 199
I just had my 3.73s installed professionally, and the guys worked with it for days, and still came out with gear whine.
They're willing to get it right so I'm taking it back in a few weeks, so we're both doing research to find out what could be causing it, and I've come up with a few things:
-We used royal purple gear oil. While it comes with friction modifier already mixed in, I've read multiple posts about people needing to add an additional 4oz. of ford friction modifier to eliminate whine. I might just go ahead and get motorcraft oil this time.
-The pinion gear depth, the shop got the tool needed to properly measure the depth of the pinion gear face; however, even with no shim installed, the pinon extends too far into the differential housing. How can we move the gear further back and get it in spec? It's not too far out, but is the the cause of the whine above 35mph?
They're willing to get it right so I'm taking it back in a few weeks, so we're both doing research to find out what could be causing it, and I've come up with a few things:
-We used royal purple gear oil. While it comes with friction modifier already mixed in, I've read multiple posts about people needing to add an additional 4oz. of ford friction modifier to eliminate whine. I might just go ahead and get motorcraft oil this time.
-The pinion gear depth, the shop got the tool needed to properly measure the depth of the pinion gear face; however, even with no shim installed, the pinon extends too far into the differential housing. How can we move the gear further back and get it in spec? It's not too far out, but is the the cause of the whine above 35mph?
05-13-2010, 03:26 PM
#15
Join Date: Apr 2009
Location: Illinois
Posts: 42
This pinion depth thing seems a little strange, with no shim between the large pinion bearing and pinion head, it still sits too far in according to the proper depth written on the face? Something is wrong with your setup. I know they are pros but even they make mistakes. I would have them make sure the large pinion bearing is seated completely against the pinion head and that the race is fully seated also. Those races are stubborn to install sometimes. And just double check the measure with the depth tool. Also double check the pinion bearing preload, it should be between 20 and 29 inch pounds for new bearings. Give us an update if any more info.
05-14-2010, 07:31 AM
#16
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
All the tools mention above will be needed. Sometimes a press is not needed for the pinion bearing, depending on how tight it is.
I will be taking my rear assembly apart in the next few weeks and changing gear ratios. I helped my neighbor do his Dana 60 a few weeks ago. He is the mechanic, not I. He has done several rear installs. It will be a learning experience.
I will be taking my rear assembly apart in the next few weeks and changing gear ratios. I helped my neighbor do his Dana 60 a few weeks ago. He is the mechanic, not I. He has done several rear installs. It will be a learning experience.
05-14-2010, 07:32 AM
#17
5th Gear Member
Join Date: Dec 2006
Location: Redding, CA
Posts: 4,552
We were doing some research the other night and located an adjustable shim that can be used for gear installs. They are $40 and make the shimming part of the job a brezze. We may use the kit after we pull it apart and look at the shims already in the diff.
05-15-2010, 09:29 AM
#18
Cut & Paste Expert
Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
You cant properly install poorly or improperly manufactured gears.
Junk in, junk out.
No matter how much time you put into the job.
Its not a time consuming process with the proper tools and knowledge.
Evidently the shop you have doing the job thinks time
will fix anything but it does not.
Or the gears they are installing have a big 'M' stamped into them...
Junk in, junk out.
No matter how much time you put into the job.
Its not a time consuming process with the proper tools and knowledge.
Evidently the shop you have doing the job thinks time
will fix anything but it does not.
Or the gears they are installing have a big 'M' stamped into them...
Last edited by 157dB; 05-15-2010 at 09:46 AM.
