Questions on Install of Z1 Differential Bushing Kit

40 to 332 · 05-08-2021, 11:35 PM

In the midst of changing out the stock rear differential bushings with the Z1 polyurethane bushing kit. A couple of questions:
1. The stock front bushings have a relatively thin black metal washer that sits on the top of the bushing. Should these washers be re-used for the Z1 bushings or can they be discarded?
2. Exactly where should the rear Z1 bushing be positioned in the subframe? Should it sit flush with the backside of the subframe (i.e., the side facing the rear of the car) ... or should it be positioned so that it sits flush with the front of the subframe?
Thanks in advance for your input!

Rusty · 05-08-2021, 11:59 PM

Flush to almost 1/16" deep in the front. You may have to install the diff to see if you can start the 2 front bolts to see if it's in the right spot. You want to snug up the rear nut and then try installing the front bolts. If you have trouble installing the front bolts. You may have to move the bushing in either direction. You always want that rear nut snug first. Because then the bushing is fitting into the taper of the stud.

40 to 332 · 05-09-2021, 11:18 AM

Quote:

Originally Posted by Rusty

Flush to almost 1/16" deep in the front. You may have to install the diff to see if you can start the 2 front bolts to see if it's in the right spot. You want to snug up the rear nut and then try installing the front bolts. If you have trouble installing the front bolts. You may have to move the bushing in either direction. You always want that rear nut snug first. Because then the bushing is fitting into the taper of the stud.

Thanks Rusty! Any idea about the black metal washers that sit atop the stock front bushings? Should they be re-used or discarded? The instructions provided by Z1 make no mention of them.

Rusty · 05-09-2021, 02:21 PM

Quote:

Originally Posted by 40 to 332

Thanks Rusty! Any idea about the black metal washers that sit atop the stock front bushings? Should they be re-used or discarded? The instructions provided by Z1 make no mention of them.

I would need to see the set-up to tell you.

40 to 332 · 05-09-2021, 03:52 PM

Okay, on closer inspection the washers are domed in the center in order to fit over the bulge in the upper portion of the stock front bushings. For that reason, I think they're specific to the stock bushings and I'm going to discard them.
As always, thanks for your help, Rusty. Much appreciated!

Rusty · 05-09-2021, 03:58 PM

Quote:

Originally Posted by 40 to 332

Okay, on closer inspection the washers are domed in the center in order to fit over the bulge in the upper portion of the stock front bushings. For that reason, I think they're specific to the stock bushings and I'm going to discard them.
As always, thanks for your help, Rusty. Much appreciated!

I did JL's poly bushings a few years back and couldn't remember how it was. Got a case of CRS. (Can't Remember Shyt)

05-08-2021, 11:35 PM	#1 (permalink)
40 to 332 Enthusiast Member Join Date: Apr 2013 Location: Kimberley, BC, CANADA Posts: 452 Drives: 13 370Z BS M6 Sport Rep Power: 439	Questions on Install of Z1 Differential Bushing Kit In the midst of changing out the stock rear differential bushings with the Z1 polyurethane bushing kit. A couple of questions: 1. The stock front bushings have a relatively thin black metal washer that sits on the top of the bushing. Should these washers be re-used for the Z1 bushings or can they be discarded? 2. Exactly where should the rear Z1 bushing be positioned in the subframe? Should it sit flush with the backside of the subframe (i.e., the side facing the rear of the car) ... or should it be positioned so that it sits flush with the front of the subframe? Thanks in advance for your input!

05-08-2021, 11:59 PM	#2 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,227 Drives: 2011 Nismo GM 6M Rep Power: 2684438	Flush to almost 1/16" deep in the front. You may have to install the diff to see if you can start the 2 front bolts to see if it's in the right spot. You want to snug up the rear nut and then try installing the front bolts. If you have trouble installing the front bolts. You may have to move the bushing in either direction. You always want that rear nut snug first. Because then the bushing is fitting into the taper of the stud. Ronin06 likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

05-09-2021, 03:52 PM	#5 (permalink)
40 to 332 Enthusiast Member Join Date: Apr 2013 Location: Kimberley, BC, CANADA Posts: 452 Drives: 13 370Z BS M6 Sport Rep Power: 439	Okay, on closer inspection the washers are domed in the center in order to fit over the bulge in the upper portion of the stock front bushings. For that reason, I think they're specific to the stock bushings and I'm going to discard them. As always, thanks for your help, Rusty. Much appreciated! Rusty likes this.

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