hi everyone, I'm new here from indonesia, I have race car B310 4doors, I want to ask about transmission for my A14, My code gearbox is 56A 4speed, I want to change my gearbox in to W transimission which is W50 5 speed, is it possible to do that..and what changes should be made, if I'm not wrong 56A can be split..
or any recommend susbstituted for my transmisson existing..
thanks..

Hi, welcome to the club

W50 can be fitted to A14 using an adapter plate OR by welding your 4-speed flange to the W50. See W Gearbox

welded



fabricated adapter plate

oke thanks, so your mean this adapter plate paired before front case (bellhousing) 56A..

56A front case is too long to use with an adapter plate. But the A14 automatic has a bellhousing that unbolts. That can be used with an adapter plate to bolt to the W50 gearbox. Unfortunately it is a custom plate, no one sells it, but you can make it

Front: Datsun 56A 4-speed
Rear: W50 with A14 bell housing

oke thank you

A couple of things to add:

While W50 is stronger the ratios are only marginally better than a 60 series transmission. Depending on how hard the A14 is tuned it won't improve the lap times (granted if you are breaking gearboxes than yes it's worth it.) The later W57-58 have ratios similar to the 56 series mid close ratio 4 speed.

I run the 56 series close ratio 4 speed behind the A15 in my car (it's making around 100 whp) and they last about 4 seasons before they strip the teeth off 3rd on the cluster gear. They might go longer but I pound the curbs and that can't be helping. Since 2003 I've broken 3 cluster gears, I run 6 events a year , so figure I'm getting 20-24 events. The boxes get kind for loose about 3 events before they fail. I've now accepted that I need to service the boxes every couple of years, no clue if this will help the reliability but they will certainly shift better.

I have found a place in New Zealand to repair the clusters at a reasonable price so I may stick with them. I have a stock 60 series 5 speed but obviously it has the big gap between 2nd and 3rd.

Tom

Nice share bro, in my country hard to find 60 series transmission, there only w50/w58 and T50, and all of my friend use T50 gearbox but the price is really expensive in here and some using from Mitsubishi KM119 gearbox (sigma galant /lancer), I thought W50 is the best way alternative substituted beside T50 and the price still cheap lah..

cheers,