Do I need a 6 speed 'box?

[Luke]

has anyone got the data for the mk7 boxes with the ratios for each gear so we can be 100% sure if 6th is the same as 5th or not

[winterheating]

yeah that would be better,
as you get 4 different ratio diffs on 6 speed so one would equall same engine speed as a 5 speed with appropriate diff

[coconut]

I can only get the ratios for FWD 5 and 6 speed boxes

5 speed VXT-75

First gear 3.80
Second gear 2.136
Third gear 1.345
Fourth gear 0.921
Fifth gear 0.674
Reverse gear 3.727

The 6 speed VMT6 is a bit more confusing though



Nope I couldnt work out the copy and paste for that lot, so you'll have to make do with a picture

[Luke]

so the final drive ratio changes i didnt know that

i take it the rear drive box doesnt do that

[coconut]

I presume its cus the 6 speed has 3 shafts as opposed to the 5 which has 2 shafts, maybe?????? I dunno

[Luke]

i dont suppose you have an exploded diagram be interesting to have a look inside one

[coconut]

not a very good pic im afraid

[Luke]

thank you

and ............. yeah thats nice and complecated

i suppose and advantage would be the wear is spread over more gears - so the final drive gears in 5th and 6th wont get any use in the other gears

[coconut]

just to complicate it a bit more








System Operation

Power transmission route in 1st gear
The 1st gear wheel is positively connected to the 1st to 4th gear output shaft by the 1st/2nd gear synchroniser assembly.

Power transmission route in 2nd gear
The 2nd gear wheel is positively connected to the 1st to 4th gear output shaft by the 1st/2nd gear synchroniser assembly.

Power transmission route in 3rd gear
The 3rd gear wheel is positively connected to the 1st to 4th gear output shaft by the 3rd/4th gear synchroniser assembly.

Power transmission route in 4th gear
The 4th gear wheel is positively connected to the 1st to 4th gear output shaft by the 3rd/4th gear synchroniser assembly.

Power transmission route in 5th gear
The 5th gear wheel is positively connected to the 5th/6th/reverse gear output shaft by the 5th/6th gear synchroniser assembly.

Power transmission route in 6th gear
The gear wheel of the 4th/6th gear drives not only the gear wheel of the 4th gear but also of the 6th gear.

The 6th gear wheel is positively connected to the 5th/6th/reverse gear output shaft by the 5th/6th gear synchroniser assembly.

Power transmission route in reverse gear
The reverse gear idler is welded to the 1st gear wheel. It is constantly engaged with the reverse gear wheel (shown separated for clarity).

The reverse gear wheel is positively connected to the 5th/6th/reverse gear output shaft by the reverse gear synchroniser assembly.

4th & 6th use the same gear, my head my head

[BART]

Six gear on my 135 is 28 mph/ik rpm. 70mph on the gps is 2450rpm.
Had a 115 5speed and 70mph was 2900 rpm.

[winterheating]

Six gear on my 135 is 28 mph/ik rpm. 70mph on the gps is 2450rpm.
Had a 115 5speed and 70mph was 2900 rpm.

what diff did it have though?

[aln101tf]

My 53 Mk6 RWD 330 does 2700 at 60mph, and I think nearly 3200 at 70mph. It has a 5.13 to 1 diff and new tyres. 75mph would be about 3400 I suppose, but I dont do that very often as it just wastes fuel and really doesn't get you there any quicker . Sounds roughly about the same revs as yours, so I'd guess you've got the same diff.
I thought it was a bit revvy at first, and wanted to see if I could change this, but it tows beautifully so now I'm going to leave as is.
Alan

[winterheating]

as yours is only 5 speed though we need to find out what diff BARTS 6 speed has to compare the 5 and 6 speed.

[winterheating]

just to complicate it a bit more








System Operation

Power transmission route in 1st gear
The 1st gear wheel is positively connected to the 1st to 4th gear output shaft by the 1st/2nd gear synchroniser assembly.

Power transmission route in 2nd gear
The 2nd gear wheel is positively connected to the 1st to 4th gear output shaft by the 1st/2nd gear synchroniser assembly.

Power transmission route in 3rd gear
The 3rd gear wheel is positively connected to the 1st to 4th gear output shaft by the 3rd/4th gear synchroniser assembly.

Power transmission route in 4th gear
The 4th gear wheel is positively connected to the 1st to 4th gear output shaft by the 3rd/4th gear synchroniser assembly.

Power transmission route in 5th gear
The 5th gear wheel is positively connected to the 5th/6th/reverse gear output shaft by the 5th/6th gear synchroniser assembly.

Power transmission route in 6th gear
The gear wheel of the 4th/6th gear drives not only the gear wheel of the 4th gear but also of the 6th gear.

The 6th gear wheel is positively connected to the 5th/6th/reverse gear output shaft by the 5th/6th gear synchroniser assembly.

Power transmission route in reverse gear
The reverse gear idler is welded to the 1st gear wheel. It is constantly engaged with the reverse gear wheel (shown separated for clarity).

The reverse gear wheel is positively connected to the 5th/6th/reverse gear output shaft by the reverse gear synchroniser assembly.

4th & 6th use the same gear, my head my head

does this gearbox have different oil to the standard 5 speeds

[coconut]

does this gearbox have different oil to the standard 5 speeds

According to etis VXT-75 the oil spec should be WSD-M2C200-C and a VMT-6 should be WSS-M2C200-D, so I would say yes

I got an engine out of a 140ps FWD at the minute and the gear oil smells like rear axle oil to me, but thats a different spec again so I dont think its the same stuff