4.08 Frontier gear swap

Z eliminator · 09-02-2011, 03:28 PM

With air preasure set at 15 lbs on the 305 35 18 drag radials and a good burnout with the line lock. They should hook good and stick to the track.

AggieAv8r · 09-03-2011, 01:37 PM

Quote:

Originally Posted by atx370z

Just get the gears from Z1 and order the install kit with it. Comes with everything needed.

Actually it doesn't - you have to order both kits from them and pay way too much for them.

I got everything needed for $660 shipped. Buy from them and you'll pay $900+ with shipping.

B.A.Q · 09-03-2011, 03:12 PM

Quote:

Originally Posted by AggieAv8r

Actually it doesn't - you have to order both kits from them and pay way too much for them.

I got everything needed for $660 shipped. Buy from them and you'll pay $900+ with shipping.

from Nissan?

And just to be sure no welding needed right? I remember reading something about welding when I was looking for prices online.

quicksilver08 · 09-03-2011, 03:25 PM

No welding needed. And parts for mime from Nissan were $980.

jnaut · 09-07-2011, 05:28 PM

PM me I can get all parts needed and ship them to you at a discount.

AggieAv8r · 09-08-2011, 08:26 AM

Quote:

Originally Posted by jnaut

PM me I can get all parts needed and ship them to you at a discount.

Now he chimes in!

Thanks for the offer though!

I just placed a second order- decided to replace the seals / bearings all the way around. New total for everything is $810 shipped - still a couple hundred cheaper than Z1 and others though. I used nissanpartsdirect.com and Infinitipartsonline.com.

jnaut · 09-08-2011, 10:55 AM

Sorry my fellow z owners

b1adesofcha0s · 09-08-2011, 11:01 AM

Quote:

Originally Posted by jnaut

Sorry my fellow z owners

Don't worry about it man, better late than never!

edconline · 09-12-2011, 05:26 AM

So to confirm, the parts list is the same for the 3.9 final drive swap with the exception of the ring/pinion which appears to be part #: 38100-0B66A?

Wanna make sure I can use that part number for the final drive, quite a bit cheaper than the Tomei 3.9 set on Z1Motorsports.

L33T Z34 · 09-17-2011, 09:10 AM

I'm currently running the 3.916 Frontier gears (38100-0B66A), w/no problems. I recommend a clutch LSD while you have the rear diff opened up though- that was the most noticeable difference. If and when open source reflashing

becomes available (a La ECU Flash for EVO) for the Z34, I'll definitely upgrade to the 4.363 (38100-0C860)

ring n pinion w/a good lean tune below 3,500 RPM.

edconline · 09-17-2011, 10:02 AM

Cool thanks for the info! I'm looking at the same LSD too, did you order yours off Z1Auto?

AggieAv8r · 10-05-2011, 09:40 AM

I got the gears put in on Monday and wow, what a difference it makes. I was apprehensive about it being too much and it affecting drivability - not at all. I read someone say it's like the car is on steroids now and thats the best way I can think to describe it. Pulls much harder - best mod I've done so far.

Just some info for those that were wondering - in my 6mt, 3000 rpm puts me at 73 mph. About 300 rpm higher than before, but not an issue at all. Doesn't have that "need to shift" feel at all.

Only downside is I do have some "gear whine" at about 40 mph when applying drive input to maintain that speed. If I let off the whine goes away during deceleration and coasting, the shop is going to adjust the pinion pre load and should take care of it.

Will update with the adjustment. Best $1100 I've spent on the car by far!

NYBladeZ · 10-05-2011, 10:24 AM

^ do you feel that your top end it must "farther" or limited now that you have the gears?

esfourteen · 10-05-2011, 11:21 AM

Quote:

Originally Posted by NYBladeZ

^ do you feel that your top end it must "farther" or limited now that you have the gears?

top end is not hurt at all by the gears unless you're crazy, you CAN hit 160mph+ and you will get there quicker with 4.08's

AggieAv8r · 10-05-2011, 09:21 PM

Quote:

Originally Posted by esfourteen

top end is not hurt at all by the gears unless you're crazy, you CAN hit 160mph+ and you will get there quicker with 4.08's

agreed - I'm still technically "breaking them in" but I have access to a runway where I'll soon test 'em out. But practically speaking, no, no noticeable difference. The car just feels like it needs to keep going .... so fun to drive now.

On the downside, and I'm hoping maybe jnaut and tranceformer will chime in, I talked to the shop that put em in today. Told him about the whine under light acceleration, just enough drive input to maintain speed, and he acted like there was nothing more he could do - he said the mesh pattern was perfect, and then gave me the dreaded "some gear sets just whine ... can't tune em out"

Told me to drive it for awhile and let everything "seat" and see if it changes any. I'm also going to switch to Redline 75W90 to see if it helps any. But I don't think it will. Any reason to believe that this may work itself out after break in ???? That just doesn't make sense to me ....

So I'm hoping you guys can give me some ammo to go back with ... as far as specific adjustments. Anyone else see this? Any experience with pinion preload adjustments? Mesh patterns that work better than others i.e. more toe, or more heel patterns? Anything that will convince him to break into it again and make an adjustment.

09-02-2011, 03:28 PM	#91 (permalink)
Z eliminator A True Z Fanatic Join Date: Jul 2009 Location: Ontario Canada Posts: 1,659 Drives: 370 Z 7AT Sports Rep Power: 19	With air preasure set at 15 lbs on the 305 35 18 drag radials and a good burnout with the line lock. They should hook good and stick to the track. __________________ 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

09-03-2011, 03:25 PM	#94 (permalink)
quicksilver08 Base Member Join Date: Jul 2011 Location: Buda, Tx Posts: 66 Drives: 08 Infiniti G37s 6mt Rep Power: 14	No welding needed. And parts for mime from Nissan were $980. __________________ 2008 Infiniti G37s 6mt coupe Berk HFC, Magnaflow Catback, JWT Popchargers, H&R, Eibach, Stillen Sways, B&M short throw, 4.08 frontier gears, NST pulleys

09-07-2011, 05:28 PM	#95 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 17	PM me I can get all parts needed and ship them to you at a discount. DEpointfive0 likes this. __________________ Best 1/4 mile 12.24 Best mph 114.5_______

09-08-2011, 10:55 AM	#97 (permalink)
jnaut A True Z Fanatic Join Date: Dec 2009 Location: wpb, fl Posts: 1,146 Drives: 09 370z Rep Power: 17	Sorry my fellow z owners __________________ Best 1/4 mile 12.24 Best mph 114.5_______

09-12-2011, 05:26 AM	#99 (permalink)
edconline Track Member Join Date: Mar 2010 Location: Edmonton Posts: 855 Drives: 10' MB Z34 6MT T/S/N Rep Power: 22	So to confirm, the parts list is the same for the 3.9 final drive swap with the exception of the ring/pinion which appears to be part #: 38100-0B66A? Wanna make sure I can use that part number for the final drive, quite a bit cheaper than the Tomei 3.9 set on Z1Motorsports. __________________ View Journal Audio Build

09-17-2011, 09:10 AM	#100 (permalink)
L33T Z34 Banned Join Date: Jun 2010 Location: Ahnald, MO Age: 47 Posts: 387 Drives: 09 K51 G C Bw/S 6MT Rep Power: 0	3.916 Frontier gears I'm currently running the 3.916 Frontier gears (38100-0B66A), w/no problems. I recommend a clutch LSD while you have the rear diff opened up though- that was the most noticeable difference. If and when open source reflashing becomes available (a La ECU Flash for EVO) for the Z34, I'll definitely upgrade to the 4.363 (38100-0C860) ring n pinion w/a good lean tune below 3,500 RPM.

09-17-2011, 10:02 AM	#101 (permalink)
edconline Track Member Join Date: Mar 2010 Location: Edmonton Posts: 855 Drives: 10' MB Z34 6MT T/S/N Rep Power: 22	Cool thanks for the info! I'm looking at the same LSD too, did you order yours off Z1Auto? __________________ View Journal Audio Build

10-05-2011, 09:40 AM	#102 (permalink)
AggieAv8r Base Member Join Date: Jun 2011 Location: Oklahoma Posts: 16 Drives: 09 BO G37S 6MT Rep Power: 14	I got the gears put in on Monday and wow, what a difference it makes. I was apprehensive about it being too much and it affecting drivability - not at all. I read someone say it's like the car is on steroids now and thats the best way I can think to describe it. Pulls much harder - best mod I've done so far. Just some info for those that were wondering - in my 6mt, 3000 rpm puts me at 73 mph. About 300 rpm higher than before, but not an issue at all. Doesn't have that "need to shift" feel at all. Only downside is I do have some "gear whine" at about 40 mph when applying drive input to maintain that speed. If I let off the whine goes away during deceleration and coasting, the shop is going to adjust the pinion pre load and should take care of it. Will update with the adjustment. Best $1100 I've spent on the car by far! __________________ 09 G37S 6MT // EIBACH // VOSSEN // INVIDIA GEMINI // TAKEDA // MOTORDYNE // SPC // UPREV // 4.08 GEARS

10-05-2011, 10:24 AM	#103 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	^ do you feel that your top end it must "farther" or limited now that you have the gears? __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

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