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TOLDJA and his gearbox dilema

toldja

By toldja,
in Four Door Family & Wagoneers

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toldja Rookie

toldja

Posted
Posted

hey guys,

got a rb20det in my vl commodore, standard engine, do have the 33 gtr cooler and a blow of valve and a brass button clutch, does 14.0 down the quarter with more to come but, i need advice and well u guys are the people to ask....................................... my gearbox is just about had it, and i know they aren't the best gearboxes in the world and are renowned for breaking, my dilema is weather i should

1. get a replacement and hope it doesn't turn out like the one i got now, bout $ 550 to $600 or..........

2. get the gearbox i already have rebuilt which would mean it would be stronger wouldn't it? ( and i have been quoted $880) and me and my friend are doing all the labour,

.................................HELP........................ :boinkcar:

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toldja Rookie

toldja

Posted
  • Author
Posted
what about put a r33 gearbox behind it?

they are basically a 2wd GTR box and alot of high powered r32s do the conversion.

and bout triple the price aren't they, got quoted almost 2000 which i just don't haveat the moment, 880 i can just scronge up but 2000 is just way out of my league for a gearbox, i would love one cause everybody i have talked to bout them say they are almost bulletproof?

sproosy Grand Master

sproosy

Posted
Posted

Hi Bruce!

Like the convo we had the toher day, if the guy rebuilding the box claims it will be a strong as an RB25 box, go for it! Its just buyin a 25 box but a whole cheaper. If i win the lotto ill buy you a 25 box mate! But i cant see that happening!! :P

Your call chief!

dangerous_daveo Grand Master

dangerous_daveo

Posted
Posted

A rebuilt RB20 box will not be as strong as an rb25 box, I dont care who you are, the RB25 box is a LOT bigger.

But it would be $2k drive in drive out kinda thing dude, if your doing it yourself it wouldnt be that bad.

But the other thought would be go for another rb20 box, but get a less harsh clutch, ie NOT a button clutch of any sort, I can tell you now that wouldnt be helping the life of it. Its probably whats hurt mine.

Other option would be a VL turbo gearbox, same as an Rb25 box just they dont have dual syncros, bit stronger than rb20 boxes apparently, somewhere in the middle.

sproosy Grand Master

sproosy

Posted
Posted
A rebuilt RB20 box will not be as strong as an rb25 box, I dont care who you are, the RB25 box is a LOT bigger.

But it would be $2k drive in drive out kinda thing dude, if your doing it yourself it wouldnt be that bad.

But the other thought would be go for another rb20 box, but get a less harsh clutch, ie NOT a button clutch of any sort, I can tell you now that wouldnt be helping the life of it.  Its probably whats hurt mine.

Other option would be a VL turbo gearbox, same as an Rb25 box just they dont have dual syncros, bit stronger than rb20 boxes apparently, somewhere in the middle.

Thats what i thought as well, i thought it was a bit suss that a gearbox guy would say that, thats why i directed old mate toldja to here for a few Q and A's. If what that guy said was true i wouldnt be think of a 25box for my 32, id just get it rebuilt, under 1g? Thast awesome but i guess htere are a few holes in his story.

Bruce mabye you should go all out and get one of those HKS 6 speed dog boxes? :) Now id like to see that! :crazy:

dangerous_daveo Grand Master

dangerous_daveo

Posted
Posted

Oh, the only thing I forgot to say is... If you get your RB20box rebuilt, it does give you peace of mind. Its the only thing Im REALLY worried about by putting the RB25 box in mine, basically, what if the box is stuffed... then I have to spend a further $1500 to rebuild it.

But hey, its a car dude, expect to just throw away money.

CEF11E Veteran

CEF11E

Posted
Posted

I wolldnt go another rb20 box if i was going to be going to the drags, racing or drift.

I broke 2 rb20 boxes within a year in my cefiro. and i didnt have a stupid ammount of power either. 165rwkw when i got the car and 195rwkw when i sold it.

but i did have a brass button clutch.

both times it was the input shaft that went. First time it stripped and second time it actually broke!

you can get an rb25 box for $1100 to $1500 if u look around and it only takes a few hours to shap it yourself if you have stands or ramps.

toldja Rookie

toldja

Posted
  • Author
Posted

hmmmmm. well then , money is the problem but i suppose if i baby it some more and jsut save up some cash i might get the 25 box thats what i want, the guy that told me that it was ging to be alot stronger was a guy from gearbox express in like minto in sydney, these opinions are great, keep em coming...... does the 25 gearbox go straight onto the 20 without any probs at all? is there any modification at all?

CEF11E Veteran

CEF11E

Posted
Posted

rb30 - single syncro per gear, same casing as rb20 box same gearsets.

rb20det dual syncro per gear same gear set as above same strength

rb25. same gear ratios as rb20 but bigger shafts, stronger splines and carrier gears and double sincros. bigger casing and stronger yoke.

rb30et. same as above but only single syncros and less ribbing on the casing (i think its 5 ribs insted of 7)

I have also been told the rb30et boxes come in 2 different ratios.

If you look in the forsale section here from time to tome you will find a wrecked r33 with reasonable k's and you will be able to get a box for $1100.

I have seen them from $900 but not often that cheap.

these boxes are very difficult to brake so if you get one from a stock car it should be in good condition.

:]

dangerous_daveo Grand Master

dangerous_daveo

Posted
Posted

In regards to bolting it up tho...

You will need a new cross member, and need to get a custom tailshaft made up. Speedo cable I would guess would be manual on your car not electronic, so that needs to be fixed up too, I belive it was GTR or nivara you could use. Thats using a RB25 box.

dangerous_daveo Grand Master

dangerous_daveo

Posted
Posted
sounds like quite a few dollars daveo, hmmmmmm, the box i have now has lasted two years, so i don't lknow......................aaarrrggggggghhhhhhh

I'll tell you in a few weeks exact cost ;)

Personally I think if you change your clutch you shouldnt keep breaking them. Id do the same, but I cant be faged and I have a set out plan on whats going to happen with my car over the comming years. So for me the box will be a concern down the track.

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