4.08 Final drive - feedback please

chrischhorn · 06-04-2013, 03:55 AM

Quote:

Originally Posted by blumango

Hi,

Can you confirm if I can retain the AT differential please? And does anyone know where I can buy a full set of shims online?

Cheers!

You CANNOT retain the AT diff. You can use the AT pumpkin/shell but not the actual diff itself. A set of shims is all custom ordered. There is no set shims that magically work. Every thing with the diff is custom fit. Shims can be ordered from .005" to .060" in increments of .005 at $16/pair from Courtesy Nissan and its not likely that you will use the same size on both sides. YOU have to measure the shims and find out which size your need unless you just order them all and figure out which ones you need.... Not only that you still need to measure the pinion depth for backlash. I learned after about 8 hours of shimming that I should let a shop take care of it as this is my first diff but without all the shims at your disposal much less measuring everything to the thousandths of an inch.... Without the proper tools and measuring equipment, there is just no way to install the 4.08 gears and diff properly.

blumango · 06-04-2013, 11:18 PM

Quote:

Originally Posted by chrischhorn

You CANNOT retain the AT diff. You can use the AT pumpkin/shell but not the actual diff itself. A set of shims is all custom ordered. There is no set shims that magically work. Every thing with the diff is custom fit. Shims can be ordered from .005" to .060" in increments of .005 at $16/pair from Courtesy Nissan and its not likely that you will use the same size on both sides. YOU have to measure the shims and find out which size your need unless you just order them all and figure out which ones you need.... Not only that you still need to measure the pinion depth for backlash. I learned after about 8 hours of shimming that I should let a shop take care of it as this is my first diff but without all the shims at your disposal much less measuring everything to the thousandths of an inch.... Without the proper tools and measuring equipment, there is just no way to install the 4.08 gears and diff properly.

Alright. Thanks a lot for your explanation. Appreciate it!

G37Sam · 06-05-2013, 11:06 AM

Quote:

Originally Posted by chrischhorn

You CANNOT retain the AT diff. You can use the AT pumpkin/shell but not the actual diff itself. A set of shims is all custom ordered. There is no set shims that magically work. Every thing with the diff is custom fit. Shims can be ordered from .005" to .060" in increments of .005 at $16/pair from Courtesy Nissan and its not likely that you will use the same size on both sides. YOU have to measure the shims and find out which size your need unless you just order them all and figure out which ones you need.... Not only that you still need to measure the pinion depth for backlash. I learned after about 8 hours of shimming that I should let a shop take care of it as this is my first diff but without all the shims at your disposal much less measuring everything to the thousandths of an inch.... Without the proper tools and measuring equipment, there is just no way to install the 4.08 gears and diff properly.

Very well said.

The ring and pinion sat in the AT housing of a 370/350. The only problem was that we couldn't get the gears to mesh properly and it seemed like it required a ton of fiddling & shimming.

chrischhorn · 06-05-2013, 03:58 PM

Quote:

Originally Posted by G37Sam

Very well said.

The ring and pinion sat in the AT housing of a 370/350. The only problem was that we couldn't get the gears to mesh properly and it seemed like it required a ton of fiddling & shimming.

I now understand since the shop contacted me yesterday morning. They are actually having to get custom shims cut to make it work. Labor wise, they are charging me a flat rate. The shims custom made are gonna cost me an extra $75.

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