will a rev 1 n/a gearbox fit a rev 2 tubby engine

matt-mr2 · Post by **matt-mr2** » Fri May 06, 2011 8:33 pm

hi as above really can i use the rev1 gearbox i have for my tubby conversion or are they different

jasongtr · Post by **jasongtr** » Fri May 06, 2011 9:07 pm

well a turbo box goes onto a v6 and so does an na one so it should do, but the driveshafts and hubs are different, and the output shaft in the gearbox is different (diff number of splines) so youll need a turbo clutch cover plate to suit the turbo flywhel and an NA friction plate to fit the gearbox shaft (this is what us V6 boys have to do)

matt-mr2 · Post by **matt-mr2** » Fri May 06, 2011 9:10 pm

thanks

jasongtr · Post by **jasongtr** » Fri May 06, 2011 9:15 pm

you will also get lots of people say that rev1 na gearboxes are not strong s wont last, and whilst that might be true mine in my V6 has been fine (not that i have done many miles) but the previous owner did around 10k i think

matt-mr2 · Post by **matt-mr2** » Fri May 06, 2011 9:22 pm

yes thanks i was just thinking if i could use the n/a box then it save me having to buy one which is great and if after a few miles it starts to pack in, i can always just upgrade to a rev 3 tubby box

jasongtr · Post by **jasongtr** » Fri May 06, 2011 9:35 pm

exactly what im going to do, when mine has the supercharger fitted it will obviously shorten its life, but i have a low mileage rev2 LSD gearbox and almost new paddle clutch ready to go in

alanmr2turbo · Post by **alanmr2turbo** » Fri May 06, 2011 11:18 pm

Why would you want to put a N/A gear box on a tubby for?

You will then need to change the shafts and hubs as well as gear linkage cables, clutch and flywheels are different you will also be missing the larger shaft centre bearing. Rev1 gearboxes also have the naff 2nd gear synchromesh

Its not just the amount of splines that are different the shafts themselves are thicker.

You're asking a box that was able to handle 154bhp to jump up to 220 or 240 that's if you haven't modded your engine.

I can see a big fail post coming on here soon LOL

jasongtr · Post by **jasongtr** » Fri May 06, 2011 11:30 pm

na gearboxes are capable of taking over 250hp

alanmr2turbo · Post by **alanmr2turbo** » Fri May 06, 2011 11:36 pm

jasongtr wrote:na gearboxes are capable of taking over 250hp

LOL so why would Toyota make turbo boxes for???? Im guessing just for the fun of it?

The shafts are thicker for a reason, the centre bearing is also there for a reason.

Now let see what to replace the cheapest and more RELIABLE way

1st option = Tubby gear box

2nd option = N/A gearbox, drive shafts, hubs, gear linkage cables, clutch plate, flywheel and to fit a REV1 box is just asking for trouble from the start.

Thank christ you don't open up a MR2 garage but if you do please let me know. So i know where not to go

jasongtr · Post by **jasongtr** » Sat May 07, 2011 7:41 am

read the thread mate, hes converting to a turbo so will already have everything.

fool

JDM-MAT · Post by **JDM-MAT** » Sat May 07, 2011 8:35 am

Toyota has a habit of over engineering parts and I bet the n/a box can handle that power. There was no need for the sarcasm I think it was a bit uncalled for.

Dale_V · Post by **Dale_V** » Sat May 07, 2011 8:46 am

I ran 300bhp through my rev2 na and the gearbox was absolutley fine, it was the smoothest box ive ever used in an mr2, I then sold it to a lad on here who put it on his v6 and he even comented on how perfect the box was! To hold the power I used a 3sgte lightened fly, 6 paddle clutch for a 2.2 camry and 3sgte pressure plate, all rated to over 300 ft lb..

The box was always maintained with clean redline MT90 gbox oil, I think this was the key in keeping it in top condition!

I only sold it as I did a rev3 turbo conversion (inc LSD box)

JDM-MAT · Post by **JDM-MAT** » Sat May 07, 2011 9:48 am

Well that's not possible from what that chap said, but I know its possible

Dale_V · Post by **Dale_V** » Sat May 07, 2011 9:58 am

JDM-MAT wrote:Well that's not possible from what that chap said, but I know its possible

Dont worry, you will learn in time to just brush past and ignore his posts, thats what most members do........

JDM-MAT · Post by **JDM-MAT** » Sat May 07, 2011 10:36 am

Yeah I know its worse on the supra owners club, it just gets my back up

alanmr2turbo · Post by **alanmr2turbo** » Sat May 07, 2011 1:21 pm

So you're telling me if you went to buy a turbo car and owner said "oh its fitted with a n/a gearbox" you would still buy it? LOL

It's just a botch job if you ask me.

Can you fit one yes. Would I? Not a chance. I like to do my jobs properly.

DiYMCRT · Post by **DiYMCRT** » Sat May 07, 2011 2:09 pm

alanmr2turbo wrote:
jasongtr wrote:na gearboxes are capable of taking over 250hp

LOL so why would Toyota make turbo boxes for???? Im guessing just for the fun of it?

The shafts are thicker for a reason, the centre bearing is also there for a reason.

Now let see what to replace the cheapest and more RELIABLE way

1st option = Tubby gear box

2nd option = N/A gearbox, drive shafts, hubs, gear linkage cables, clutch plate, flywheel and to fit a REV1 box is just asking for trouble from the start.

Thank christ you don't open up a MR2 garage but if you do please let me know. So i know where not to go

i believe toyota did it to give the tubbys a longer ratio, most gearbox's are designed to take alot more power than the engine they are bolted to produces if it was designed for 150 bhp do you think after 20 years it'd still be working

your opinion you are entitled to and it'd probably split the oc as to who would use a tubby box and who would use the n/a one in the garage but money doesn't grow on tree's, just try to be more civilised on expressing one's opinion's

cvega666 · Post by **cvega666** » Sat May 07, 2011 3:39 pm

Paul Woods uses NA boxes in his V6 conversions - so they're definately not too weak for a stock-ish tubby. The amount of work required to fit NA box to a tubby makes it a bit questionable...

smoke · Post by **smoke** » Sat May 07, 2011 9:19 pm

DiYMCRT wrote:
i believe toyota did it to give the tubbys a longer ratio ...

Just a newcomer, so please do not hit me

I think I've read somewhere the opposite:
the tubbys have shorter gearing than the NA.
Is there a table related to this?

DAN_REV1_TURBO · Post by **DAN_REV1_TURBO** » Sat May 07, 2011 9:22 pm

http://www.megaboost.co.uk/mr2/frames// ... e.htm#mk2t

www.imoc.co.uk

will a rev 1 n/a gearbox fit a rev 2 tubby engine

will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine

Re: will a rev 1 n/a gearbox fit a rev 2 tubby engine