Gearbox Codes ??? & Will any T25 Box Fit?

[aahridey]

Hi,

I have ongoing gearbox problems which although have eased off just now, will certainly be back soon !!! My van is a 1984 model and started life as a 1.9 petrol water cooled. At some point it's had a 1988 VW Passat 1.6td JX engine fitted and has also had a replacement 4 speed gearbox in the last few years. As far as I know it now has a diesel gearbox fitted - it's highest comfortable cruising speed is 55mph in 4th gear.

I've been looking for a used replacement 4 speed box (limited funds) but am unable to find a code on mine. As there's so many variants i'm not sure which i need.....

Can I fit any petrol or diesel gearbox assuming i'm not bothered about gear ratios and use my existing bell housing? If so, does it have to be from a water cooled vehicle or will an Aircooled one also fit?

Any advice would be appreciated.

Many thanks, Mark

[itchyfeet]

http://www.brick-yard.co.uk/VehicleSpec ... fo/gbx.htm" onclick="window.open(this.href);return false;

as far as I know code should be on the flat bottom of the box below the reverse switch like this pic..

[aahridey]

Thanks, I'll have another good look.

In the event that I can't find one the same, does anybody know if any T25 box will fit?

Thanks, Mark

[faggie]

you will also need the matching gear linkage if you fit the early dk code high ratio box or a 5 speed aap box ,

[AdrianC]

Can I fit any petrol or diesel gearbox assuming i'm not bothered about gear ratios

That's a VERY big assumption. There's going to be a huge difference between ratios, and that'll make a similarly huge difference to drivability.

[nevill3]

Have you seen the list on the Brickyard?

http://www.brick-yard.co.uk/VehicleSpec ... fo/gbx.htm

A list of all the codes with their ratios, my gearbox code was very hard to read due to all the crud, a good wire brushing helped expose a couple of letters for me.

[aahridey]

Aaaaha... thanks for the info so far - found the code - it's an ABB which according to the Brick Yard is from a 44kw petrol van produced up to 7/1984.

So having checked the chart the gear ratios are the same as a lot of other gearboxes. So, the question remains, would other gearboxes with similar ratios fit straight in?

Thanks, Mark

[Aidan]

ABB is a 4.57 final drive box witha 0.85 fourth gear and should fly along with a good 1.9 propelling it and happily do 70mph at around 3600rpm

but it may be there's an ABF inside the case

for a 1.9 D 1Y engine a ABD will do fine, the ABB is a dadge longer legged

[bounce-rentals]

so putting a diesel box in a petrol van will have what effect?

70 mph on petrol box - 3600 rpm
70 mph on diesel box = ???

[keith]

Not petrol or diesel box.....specific code of box which indicates ratios...

Not as simple as d or p.

[Aidan]

so putting a diesel box in a petrol van will have what effect?

70 mph on petrol box - 3600 rpm
70 mph on diesel box = ???

petrol 5 speed ABN = Turbodiesel 5 speed 3H, exactly the same gears and gearing only difference is input shaft and bellhousing

if you fit a 1.6 or 1.7 N/a diesel box in a petrol van you get a van that accelerates really quickly car style, easy keep up with traffic in town but to do a true 70mph needs more than 4500 rpm and ear defenders and deep pockets for the fuel

[bounce-rentals]

fuel is expensive enough. cheers for info.