i been looking at a r180 with the 3.9 ratio from a 720 truck 4x4 . will it direct bolt in to my70 240z? or do i need new shafts . this one has bolt flanges.

i am going with l28 and want to make the best of it. i am going with the 4 speed for now although i have 5speed from a 83 zx . but from what i read i should not use it.?

any ideas would be helpful.

thanks

dan

If you put a 3.9 differential in the car you will need the 83 5-speed, at least on the highway.

I cannot answer the question about the halfshafts, but a L28 with the 83 5-speed and a 3.9 differential is pretty much the hot setup for all Nissan parts.

Good motoring!

Where or what did you read about the 5 speed that was so bad

I really can't remember be honest, after further reading I found it has a taller 1st and 2nd. i am going with it since it is what I have sitting the garage.

What year is your Z?

I have the exact same set up for transmission and diff - it bolted right up, I did replace all the seals. If I were to do it again I would opt for a 4:11 diff.

Edited May 4, 201311 yr by Travel'n Man

i have a 70 that has a long way to go. i wasnt sure which way to go and this one came up. they are hard to find . i hope that i made the right decison . i went with the 720 because it sounds a lot easier than to have to scource out all the parts for the r200. all said and done the cost was about the same . 4.11 give you more bottom end? is it a direct bolt up? it is a r180?

4:11 will give you more bottom end - be care if you opt that route - some of the sides are pop in and not bolt in - you will need to verify with the seller what type he is selling if you are going to make a purchase.

the one I ordered was bolt in. would like to find a 4.11 it is difficult.

i found a 4.11 bolt in . would it be worth it to pick it up and try to sell off the 3.9 . it is going to to be a weekend street machine . think i would notice a difference between the two? tried to find the ratio caculator but it was gone.