What 3rd and 4th gear ratios?

[T3TE]

Hey guys!!

I have a DH transmission in my T3 and it was originally a 1.6 Diesel NA. Year 1981.

I have now transplanted a Toyota 3c-te which is an electronic 2.2TD engine. Its churns out around 105BHP and I have also added an intercooler from a Pajero 2.8TD 4M40.

The problem is that the engine maxes out at around 115kms but I want want a higher top speed like 140-150.. the engine has the grunt. I will be running 225/65/R16 wheels so what 3rd and 4th gear ratios should I be looking for? I want a torquey 3rd with good speed since I live in hills and this where I will be driving most. And a tall ratio 4th for highway cruising. Please let me know of suppliers of such gears along with prices.

Cheers!

[CovKid]

Talk to member Aidan. He knows all about longer gears, Not cheap to do though

[T3TE]

Thanks Cockid!

Is he on this forum?

Cheers!

[billy739]

you are running an Aircooled era box.

get one from a 2.0 petrol Aircooled bus

DK code.

much better gears and the tallest ratios of all boxes OEM (except the AAP, 5 speed 2.1 injection box , but then you would need to change driveshafts/gearlinkage/mounts ect)

[T3TE]

Thanks billy..

I can't get any other box.. this is the only option I have cuz there are none available here.

[billy739]

aiden dosent have the tooling for the DH box as its an Aircooled(unless hes invested)

the dh /dk boxes are basically bay window boxes (68-79) with different noses/shift rods

if you can get a late bay box perhaps you can swap the noses and shift levers

not sure about gear ratios but the main difference in diff pinion/ ring ratios so to swap would mean total strip/swap.

i have got into the T25/T3 box and repaired the shift forks DIY style but it takes time /patience without the proper kit(not advisable when you have a pro who can do it tho) so i know its possible

i do have a dk box with no 1st /2nd gear , although postage would be high perhaps i could strip the mainshaft/ring and ship that to you if its good once ive stripped it?

[T3TE]

Thanks Billy,

Finding usable VW parts here is next to impossible.

I can strip and swap the parts, I have a very intelligent and experience mechanic here who has been working with such older VWs for over 3 decades now. So installing the bits is not a problem.

I have sent a pm to Aidan about the C&P from a DK, please get in touch with him regarding this.

Cheers!