Rb20 Horrible Gearbox?

[HungarySkyline]

hey all, i bought my r32 with one of the bearings destroy(metal pieces everywhere) which in turn rendered the box useless, i had another rb20 box installed $750 all up.

But now im seeing that this new box has a small whine nothing too bad, but today was the first i actually gave it in 1-2-3 gear, and when it into 2nd it went in like it was going explode if i did it a few more times. Are all 20 box's like this, or is this box probably stuffed aswell?

thanks

[Hanaldo]

Doesn't sound good

[GTScotT]

Exactly what was it doing?

[HungarySkyline]

It feels so bad when going into 2nd quickly, im not snapping it in but just fast, feels like its not far from crunching, the box just feel weak. Im curious if this is like all the 20 boxes.

Edited April 22, 2013 by HungarySkyline

[Hanaldo]

Oh, I thought it was whining through the gears.

NVM then. Sounds like an ordinary 20 box to me, they are Nissan's $2 hoe.

[GTScotT]

wrong.

Its the same box as whats in most of the 5 speed RWD cars, except R33 GTST and Z32 twin turbo IIRC.

It shouldnt feel like that, if anything it should feel better than an RB25 box on quick shifts. Lighter gearsets and components would make it easier to change between cogs.

That box has a problem. I can shift like an absolute MOFO in my S14 (and every other 5 speeder I've driven) and it is the same box. It could be the clutch, but you should take it back to the mechanic and get them to sort it out.

[Hanaldo]

And R34 GTT.

All the 20 boxes I have driven with (4 from memory) have felt extremely fragile in comparison to the 25 box. That said, Scott knows more about these things than me. Best get it checked out.

[GTScotT]

Yeap, I wasn't sure about the GTT as I know it comes 6 speed lol couldnt recall if there was a 5 speed model also, but am sure they would use the same box as the 33.

The smaller 5 speed is definitely pretty fragile in comparison, but shouldn't feel like its going to explode. Should just feel lighter to work with than the bigger boxes, and like I said should shift easier/quicker with less effort.

[niZmO_Man]

Sounds like a worn out gearbox. What oil is in it?

[HungarySkyline]

Just the recommended oil my mechanic put the box in, it probably is just worn, probably not give it anymore hell til i can afford the r33 box. thanks all

[niZmO_Man]

The R32 box out of my GTS-t was very smooth, took 8krpm shifts into second without fuss. Sounds like you have a worn gearbox.

[Dose Pipe Sutututu]

drain it and put some Redline Lightweight, that purple shit..

Will make the box feel totally different

[AngryRB]

If i were you id be diluting the gearbox oil with some engine oil, thats what i did and my box went from crunching, jarring and needing a rebuild to now being smooth and awesome

If the oils too thick or its overfilled it will not help.

Edited April 26, 2013 by AngryRBGTX

[GTScotT]

Fwiw certain trucks use the same oil for the box as they do for the motor (5w30) so the motor oil suggestion isn't a bad thing and can help.

Personally I would take it back. You paid good money and got a shit gearbox.