thanks,looks like that answers all the questions...next is purchase..lol. These are such a better price over the 3.9 its unbeweavable lmao

 

it's cause they are massed produced for Frontiers. Where as the 3.9 are NISMOS! You know you pay for the name, also low rate production is more expensive. You'll also need to buy a pinion bearing..add another $77.00

 

10-13-07

Updated the Main post with my new time from the track.. Ran a personal best of 13.064@105.50mph.

These gears are proving to be a nice addition.

Here is the link to the thread.

https://my350z.com/forum/drag/307682-new-best-13-064-105-5-all-motor.html

Todd

 

Are you thinking they won't be? I'm not really sure, but I would think they would be allright, the crank should take it now (bigger bearings) and the valves *should* be ok (stiffer springs), but I don't know what would kill the rods at 8,000 - the side to side is less than the DE motors because of the taller deck height. I've really got no clue on how you would know though without testing it.

-Tyler

 

It's not the rods you're worried about at 8k rpms.

 

...

 

...

 

Have you found any shops to do the swap.

I've started hunting prices. 3 shops have said "you buy the alignment bearings and I'll do it for you. I proceed to realize alignment bearings cost a lot and go

 

did he say a price

 

I asked Performance Factory for a quote, and Jeremy wants me to buy the parts first and bring it in to him to see what's all involved. However, I'd like to know a ballpark install price before I go buying parts..know what I mean?

 

Yeah. My friend (who has a BMW shop) said to call a 4x4 shop and ask, I know of 2 and one of them already ripped my friend off on something so I'm weary of that idea. But if the gears are from a frontier its completely believable that it would be the right place to check. They regear stuff all the time.

I may even ask the dealer if they could do it. Worst case scenario they say no.

 

install generally should run in the $400-$600 range,depending on the hourly charge.

parts can be found here (though the 4.08 are currently backordered, eta this month according to nissan)

http://www.z1auto.com/prodmore.asp?m...ne&prodid=2833

 

For those of you in Florida wanting the 4.08 gears, Lokey Infiniti in Clearwater is going to install mine. They don't install rear end gears often, but they do it occasionally. I don't know what the price is/will be.

I'm one of the people waiting for the gears to come in at Z1, so I'll let you know how things go as soon as I get them!

 

Definitely keep us posted.

I wouldn't be getting them in until after Christmas (more needing the car than anything) but I definitely want to see what it could do (yay for daytime Test and Tunes in January )

If I haven't gotten a 12 by then I think it should be pretty easy re-geared and high's in the 50's or low 60's.

 

^^ yeah the HR DEF loves the cooler weather... cant wait for christmas time weather here in Fl either!

 

I got a quote from a local shop that does good work. Its really the only shop in town (including the dealer) that I would let touch my car. The guy has a 240z race car, among a few other Z cars that are race prepped, drives a Titan, etc.

$400 to drop the car off and the ring/pinion, pick it up in the afternoon. If the bearings can't be reused he said it would be $400 plus his cost +15% on the bearings. He acted like it all depended on how they pressed off (kindof random) so he gave me ~75% probability at reuse.

I think thats a great price, but thought I'd get an outside opinion - $75 an hour labor rate at this shop.

Thoughts?

 

That does not seem like a bad price at all.. Its alot of work to swap out the ring an pinion. And he is right, he might be able to reuse the bearing. They are kinda hard to pull off with out damaging.

Let me know how things go.
Todd

 

Just buy a new bearing... safe yourself the "if" headache. And $400 for labor is a great price.

 

There are some perishables involved in changing out the ring and pinion. The pinion Nut, pinion crush sleeve, and pinion oil seal should all be replaced with new items. You can buy these in a kit from Adam (Z1) for only $24.50. I would buy these at a minimum, especially the crush sleeve because the pinion depth might be different and the old sleeve might already be too small (collapsed too much).

Since the pinion bearings will have to be changed (moved to the new 4.08 pinion), there is a high likelyhood that they could be damaged. I would replace them too... but you probably might not maybe have to.

My car has 20,000 miles on it, plus I am putting in a new diff, so I'm going to replace all the bearings.

 

I'm still 2 months out before I'll throw the gears in, but I thought that seemed reasonable. I planned on buying the bearings and just telling him to "try" to not use them - and return them or whatever if he did so.