hiii

 

what the difrant between n/a & TT gear box (manual)

 

becuase i change my Z tt gear box to n/a gear & i see the RPM going up than TT orginal gear box

 

becausa i have a broplem with old gear box & i have n/a gearbox

 

befor in 100KM Rpm 2.5 X1000

naw in 100km rpm 3 :cry:

 

:confused: ?

Ratios!!! I'm sure if you can change a gearbox, you might have been able to work that one out. ;)

Gearbox ratios are the same !

 

The ratio is only different in the Rear differential.

EGG ON MY FACE!!!!!! My bad, I always thought the ratios were different.

 

IIRC fifth gear ratio is different to match with the different diff ratios??

BTW have you put the TT speedsensor in the NA box??

Good point about speed sensor.

 

99.9999% sure that 0.75 is the 5th gear ratio for TT and NA Manual.

 

It should be in the "300zx enthusiast companion" book, but I dont have a copy here to confirm.

Hi,

The book quotes both boxes as 0.75... just the final drive ratios as being different.(4.083:1 NA / 3.69:1 TT Europe)

Cheerz,

Jez.

Good point about speed sensor.

 

99.9999% sure that 0.75 is the 5th gear ratio for TT and NA Manual.

 

It should be in the "300zx enthusiast companion" book, but I dont have a copy here to confirm.

 

Well I have... you are right according to the book.

I was talking about it to Mr F a bit back but didnt remember all that was said.

I do know however that you need to match the speed sensor with the original car clocks or it will read wrong.

No Daves right the box ratios are the same but the speed sensor is different.The only physical difference is the TT casing is thicker to handle more torque.

>> The only physical difference is the TT casing is thicker to handle more torque.

 

actually it's the other way around...

the TT's bellhousing is slightly thinner because the TT-flywheel has a slightly larger diameter

All I know is that when the output bearing of my TT box was singing its tits off I put a NA box in and it is exactly the same. I swapped the bell housings over, but before I did it I had the pat numbers checked and all gear clusters are the same as the TT including final drive.

>> The only physical difference is the TT casing is thicker to handle more torque.

 

actually it's the other way around...

the TT's bellhousing is slightly thinner because the TT-flywheel has a slightly larger diameter

 

Yes! I heard this before also TT casing is much more Thicker indeed.

>> The only physical difference is the TT casing is thicker to handle more torque.

 

actually it's the other way around...

the TT's bellhousing is slightly thinner because the TT-flywheel has a slightly larger diameter

by casing i mean the wall thickness of the gear box casting surrounding the gear train.thats why the tt box is heavier.