BigHate

I am mulling over the possibility of a GMT 400 Z-71 4WD and converting to an AWD setup. Naturally there will be an LS motor in front. However the problem begins when I introduce the 4L80 to the equation. I know there are 29 spline outputshafts that are made to convert to a NVG149. I have also seen the 32 spline input some guy named time2kill on another forum made for members. Naturally I would like to have that but am not sure if he still makes them. Also is the NVG149 better than the BW4485 that mates to the 6L80?
I guess what I am asking has anyone mated an AWD unit to their 4L80?

1FastBrick

iTrader: (17)

Yes.

don't get the smaller output shaft. they are weak an known to break.

Get the gear even if you have to send yours to have the conversion done. It is by far the best way to go.

TrendSetter

I got lucky and found a np149 that was already upgraded to the larger input shaft. I like the awd, well worth it.

BigHate

where do I send it to get the conversion done?

TrendSetter

find the guy named time2kill
im not sure where he is active, hes been on here in the past.

BigHate

I'll try to contact him. BTW is there any difference between the borg warner unit, i think it's called the BW4485, and the NVG149?

Guitageorge

Hey Big Hate the bg4485 as the 32 spline shaft that is required for the swap as to where the nv149 has to have the spline swapped out.

1FastBrick

iTrader: (17)

yes there is a difference in the units in how they function.

https://www.performancetrucks.net/fo...-cases-457402/

You have to have the input coupler machined on the NV149 to mate to the transmissions 32 spline output shaft on the 4L80E

SDjeff619

Just shipped my input shaft out for the re-spline. Not cheap at all but it needs to be done.

About20ninj45

Where to and hour much if you don't mind me asking?