I have the Hardbody Nissan 2.4L 4WDQuestion:  Transmission started whining in 1st,2nd, 3rd. 4th gear normal, 5th gear a little whine. Oil change clear with no debris. Trans has 300,000 miles. What transmission do I have.  Is it worth repair or need replace, can you make a recommendation?Answer:Your transmission is a Nissan Hardbody model FS5W71C, you have a couple of options, the first is to purchase a rebuilt unit the second optionIs to rebuild or have your transmission rebuilt locally.If you elect to purchase a rebuilt unit the correct part number is MTNIS003 your cost of this factory built dyno tested unit is $ 1366.67 plus a $350.00 core deposit plus freight.The factory rep has put together a list of probable parts that you will want to replace if you elect to overhaul the existing unit. See list below S&H will be added.If you need more technical information give Scott a call toll free 888-824-2012 he can help you, he can also help with the order.

Bearing Rebuild Kit with Synchro Rings 4wd Hardbody (86-8/89) (2.4L) (1 Piece 2nd Synchro, no Synchro for Reverse)

MWTBK212WS

$153.50

36

5th Gear Set (21 T, 39 T) (4wd) (86-93) (Non Synchronized Reverse) (ring not included)

NIS-5

$166.67

55

Reverse Idler Gear (21 T) (11/85-Up)

NIS-10A

$30.21

Reverse Gear Kit (86-93) (Non Synchronized Reverse)

TRS-303587K

$184.05