Hi' everyone
What modification do i need for stock 1303 drive shaft to fit 944 hub or it just bolt on?

this may help you

http://vdubengineering.com/technical/porsche-brake-conversions-2/ 

Depending on the year none.

Early Hub
http://www.ebay.com.au/itm/Porsche-924-944-rear-wheel-hub-studs-OEM-477501065...

Early Axle
http://www.ebay.com.au/itm/Porsche-924-924-Turbo-944-83-85-1-rear-stub-axle-O...

Late Hub
http://www.ebay.com.au/itm/Porsche-944-924-S-rear-wheel-hub-studs-OEM-9513310...

Late Axle
http://www.ebay.com.au/itm/Porsche-924-S-944-944-S2-Turbo-rear-stub-axle-OEM-...

No modification to the stock 1303 drive shafts are required if using the early 944 steel trailing arms.

You will however need to use a 100mm T2 CV joint on the (outer) trailing arm. I just use the stock 1303 inner CV (gearbox side).

You can change to gearbox output flanges to T2 if you like but not required unless running Hipo motor or doing burnouts.

Hi, thanks for all info, the parts i found is from 944, 87 model. More info please.

Hi

87 model will use the alloy arms, they will widen your tack about 46 mm per side, I have them on my 1303. They use a micro stub so nothing from a 1303 trailing arm is usable.

Steve