Aluminum Differential Bushings

1slow370 · 03-25-2010, 04:24 AM

Well after working 12 hours i stayed late at work and finally got these babies made. Cost to me was nothing other than my time so it's a pretty good deal. The finish is bad because they were test fitted several times in the differential bores and it is a slight press fit (.0008 in). At this time i have no plans to make any more, and I'm waiting on Z1 to ship me my F'ing stub shaft before i will be able to drive the car again. After i get the testing done i will decide whether or not to continue replacing more rubber including the sub-frame mounts (would be delrin) and the rear differential mount (steel insert in aluminum).

schrute · 03-25-2010, 04:29 AM

Cool. Youz gotz skillz.

1slow370 · 03-25-2010, 04:35 AM

thats why they call it skilled labor in the classifieds (i'd put a smiley here but i don't remember the text for it and firefox is fricken killing all the little html buttons)

schrute · 03-25-2010, 04:48 AM

So what's the theory behind stiffer diff mounts?

1slow370 · 03-25-2010, 04:54 AM

less drive train motion in the rear keeps the axles from moving and prevents wheel hop. basically the stock mounts allow the differential to shimmy over a quarter of an inch and that shaking is translated through the axles to the suspension causing wheel hop. but on the other hand the stiffer mounts are going to transfer a lot more vibration and noise to the chassis of the car because they won't be dampening anything.

schrute · 03-25-2010, 05:01 AM

Gotcha. +1 Rep for the explanation. So are these for launching and drag racing primarily?

1slow370 · 03-25-2010, 05:15 AM

pretty much, it will have a minimal effect on power-on handling, but changing out the subframe mounts for stiffer ones really helps stiffen the rear end and keep it from getting squirrely, but subframe bushing will make the car extremely loud and transfer a lot of vibration

schrute · 03-25-2010, 05:19 AM

Good stuff... how long until they're on the car?

1slow370 · 03-25-2010, 05:26 AM

like i said ask Z1 they have to get me a base stub shaft to replace my VLSD shaft so i can finish the install on my Quaife. Apparently Nissan has back ordered the shafts but if anyone knows where i can get one please tell me. My car has been in the air for 2 weeks now and i'm starting to get pissed.

Edit: they sent me the wrong one the first time so i started the install only to find out it was the wrong one and my differential is already apart.

schrute · 03-25-2010, 05:34 AM

That sucks. Sorry man. Cars don't belong in the air for two weeks. Not the ones we want to drive anyway. GL!

bluestyle55 · 03-25-2010, 11:26 AM

Rep +1 for creative skill. I will be watching for the final results..

RCZ · 03-25-2010, 03:21 PM

$10 bucks says too much NVH. This car is a mess when it comes to vibrations.

KEVTEX · 03-25-2010, 03:54 PM

The approach I took to reducing diff movement was to add spacers in the bottom of the front diff mounts. This removed all the slop on the bottom of the diff mount and can be done without removing the diff assembly.

1slow370 · 03-26-2010, 02:42 AM

yeah the only problem with those spacers is that you are streching the stock mounts which may cause them to tear and they will leak black liquid silicone all over the diff, that and they will still have horribly bad side to side motion.

RCZ yeah i'm waiting to see how bad it will be but it probably won't be as bad as doing the tranny mount because the subframe bushings will still be isolating it from the chassis where as the tranny crossmember is hard bolted to the frame. time will tell once i get my car on the ground. went over to my local parts center and asked them about an axle flange and they said it's showing that it could be here in three days if i ordered it but i'm having them call to make sure first. If that pans out i might pull my order from z1 but i won't know until tomorrow or next week. my bearings hadn't come in yet today but he said maybe tomorrow. is there anybody on here high up in nissan that could pull some strings and get around the infamous nissan internal backorder?

KEVTEX · 03-26-2010, 09:31 AM

To avoid stretching the stock mounts, I made thin spacers fit both into the air gap in the round casting under the stock flexible mounting and under the casting itself. There should not be any vertical compression of the stock flexible mounting material with this approach as the casting itself is movement constrained to the downside. With the spacer inside the circular casting, there might even be some reduction in side to side movement. My objective was to prevent wheelhop on dragstrip starts where side to side motion is not the main concern.

03-25-2010, 04:24 AM	#1 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Aluminum Differential Bushings Well after working 12 hours i stayed late at work and finally got these babies made. Cost to me was nothing other than my time so it's a pretty good deal. The finish is bad because they were test fitted several times in the differential bores and it is a slight press fit (.0008 in). At this time i have no plans to make any more, and I'm waiting on Z1 to ship me my F'ing stub shaft before i will be able to drive the car again. After i get the testing done i will decide whether or not to continue replacing more rubber including the sub-frame mounts (would be delrin) and the rear differential mount (steel insert in aluminum). __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

03-25-2010, 04:29 AM	#2 (permalink)
schrute Track Member Join Date: Aug 2009 Location: utah Posts: 781 Drives: my z every day Rep Power: 17	Cool. Youz gotz skillz. __________________ my journal \| 2009 370z touring \| 6mt \| platinum graphite \| my album second skin \| mr works \| fast intentions \| ssr \| eibach \| hotchkis \| spc \| toyo \| bluebatmobile \| v-led \| jwt \| ventureshield \| tinted tails

03-25-2010, 04:35 AM	#3 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	thats why they call it skilled labor in the classifieds (i'd put a smiley here but i don't remember the text for it and firefox is fricken killing all the little html buttons) __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

03-25-2010, 04:48 AM	#4 (permalink)
schrute Track Member Join Date: Aug 2009 Location: utah Posts: 781 Drives: my z every day Rep Power: 17	So what's the theory behind stiffer diff mounts? __________________ my journal \| 2009 370z touring \| 6mt \| platinum graphite \| my album second skin \| mr works \| fast intentions \| ssr \| eibach \| hotchkis \| spc \| toyo \| bluebatmobile \| v-led \| jwt \| ventureshield \| tinted tails

03-25-2010, 04:54 AM	#5 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	less drive train motion in the rear keeps the axles from moving and prevents wheel hop. basically the stock mounts allow the differential to shimmy over a quarter of an inch and that shaking is translated through the axles to the suspension causing wheel hop. but on the other hand the stiffer mounts are going to transfer a lot more vibration and noise to the chassis of the car because they won't be dampening anything. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

03-25-2010, 05:01 AM	#6 (permalink)
schrute Track Member Join Date: Aug 2009 Location: utah Posts: 781 Drives: my z every day Rep Power: 17	Gotcha. +1 Rep for the explanation. So are these for launching and drag racing primarily? __________________ my journal \| 2009 370z touring \| 6mt \| platinum graphite \| my album second skin \| mr works \| fast intentions \| ssr \| eibach \| hotchkis \| spc \| toyo \| bluebatmobile \| v-led \| jwt \| ventureshield \| tinted tails

03-25-2010, 05:15 AM	#7 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	pretty much, it will have a minimal effect on power-on handling, but changing out the subframe mounts for stiffer ones really helps stiffen the rear end and keep it from getting squirrely, but subframe bushing will make the car extremely loud and transfer a lot of vibration __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

03-25-2010, 05:19 AM	#8 (permalink)
schrute Track Member Join Date: Aug 2009 Location: utah Posts: 781 Drives: my z every day Rep Power: 17	Good stuff... how long until they're on the car? __________________ my journal \| 2009 370z touring \| 6mt \| platinum graphite \| my album second skin \| mr works \| fast intentions \| ssr \| eibach \| hotchkis \| spc \| toyo \| bluebatmobile \| v-led \| jwt \| ventureshield \| tinted tails

03-25-2010, 05:26 AM	#9 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	like i said ask Z1 they have to get me a base stub shaft to replace my VLSD shaft so i can finish the install on my Quaife. Apparently Nissan has back ordered the shafts but if anyone knows where i can get one please tell me. My car has been in the air for 2 weeks now and i'm starting to get pissed. Edit: they sent me the wrong one the first time so i started the install only to find out it was the wrong one and my differential is already apart. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 03-25-2010 at 05:28 AM.

03-25-2010, 05:34 AM	#10 (permalink)
schrute Track Member Join Date: Aug 2009 Location: utah Posts: 781 Drives: my z every day Rep Power: 17	That sucks. Sorry man. Cars don't belong in the air for two weeks. Not the ones we want to drive anyway. GL! __________________ my journal \| 2009 370z touring \| 6mt \| platinum graphite \| my album second skin \| mr works \| fast intentions \| ssr \| eibach \| hotchkis \| spc \| toyo \| bluebatmobile \| v-led \| jwt \| ventureshield \| tinted tails

03-25-2010, 11:26 AM	#11 (permalink)
bluestyle55 Premium Member Join Date: Apr 2009 Location: Pa Posts: 194 Drives: 09 Nissan 370z B 6M Rep Power: 17	Rep +1 for creative skill. I will be watching for the final results.. __________________ 2009 370z 6MT Touring w/ Sport Pkg \| Invidia Gemini CBE\| Stillen G3 CAI \| ERZ HFC's \|X-Pel Clear Bra \| 20% Tint

03-25-2010, 03:21 PM	#12 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	$10 bucks says too much NVH. This car is a mess when it comes to vibrations.

03-25-2010, 03:54 PM	#13 (permalink)
KEVTEX Base Member Join Date: Nov 2009 Location: Montgomery, TX Posts: 119 Drives: 2010 370Z 7at sp pg Rep Power: 16	The approach I took to reducing diff movement was to add spacers in the bottom of the front diff mounts. This removed all the slop on the bottom of the diff mount and can be done without removing the diff assembly.

03-26-2010, 02:42 AM	#14 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	yeah the only problem with those spacers is that you are streching the stock mounts which may cause them to tear and they will leak black liquid silicone all over the diff, that and they will still have horribly bad side to side motion. RCZ yeah i'm waiting to see how bad it will be but it probably won't be as bad as doing the tranny mount because the subframe bushings will still be isolating it from the chassis where as the tranny crossmember is hard bolted to the frame. time will tell once i get my car on the ground. went over to my local parts center and asked them about an axle flange and they said it's showing that it could be here in three days if i ordered it but i'm having them call to make sure first. If that pans out i might pull my order from z1 but i won't know until tomorrow or next week. my bearings hadn't come in yet today but he said maybe tomorrow. is there anybody on here high up in nissan that could pull some strings and get around the infamous nissan internal backorder? __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

03-26-2010, 09:31 AM	#15 (permalink)
KEVTEX Base Member Join Date: Nov 2009 Location: Montgomery, TX Posts: 119 Drives: 2010 370Z 7at sp pg Rep Power: 16	To avoid stretching the stock mounts, I made thin spacers fit both into the air gap in the round casting under the stock flexible mounting and under the casting itself. There should not be any vertical compression of the stock flexible mounting material with this approach as the casting itself is movement constrained to the downside. With the spacer inside the circular casting, there might even be some reduction in side to side movement. My objective was to prevent wheelhop on dragstrip starts where side to side motion is not the main concern.

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