63-Series Transmission

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The 63a transmission is a large strong transmission. It was adapted by Nissan to fill a marketing need in USA for a 5-speed (to compete with the Corolla SR-5) and so the existing 63a was modified to fit the small A-series engine. This has two special significances:

• It is strong, suitable for overbored, supercharged or turbocharged A-series engines
• Its successor, the 60-Series Transmission 5-speed is much lighter and so a better fit for A14 and A15 naturally aspirated engines. The 60 is also smaller than 63 and so a better fit in Datsun 1200s.

The 63A came in two versions:

• 63A to fit L-series engine
• 63A to fit A-series engine

So check the bellhousing bolt pattern.

For an overview of 5-speeds in general, see: 5-Speeds. Comparos, Ratio info, etc.

Datsun boxes are numbered by the distance between the centres of the countershaft and the main shaft. The 63-series has 63 mm between the shaft centres.

The "A" indicates the transmission revision, not the engine type it fits. ? my casting has a 63A#1 cast were there different versions?

• 63A

Dogleg 5 speed overdrive 5th Slave cylinder is on the left side Uses AT prop shaft What clutch? What was the special vehicle these came out of?

• 63L

63-Series 5-speed Swap Notes

63a crossmember
Note that the factory crossmember mounting brackets have been removed from inside the tunnel. This crossmember bolts to the floor.

Get a Datsun 810 speedometer cable, it's about 150 mm longer.

You'll need a prop shaft from an AT equipped 60 series tranny as it uses the same output shaft.

63a

Gear Ratios

Also see: 4-speed gear ratios at end of article 5-Speeds

Category:Drivetrain Modifications