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Revision as of 04:01, 12 April 2013

The Toyota T50 overdrive 5-speed is light, strong and readily available. The ratios are closer than the regular Datsun 5-Speeds. But you need to adapt it to the A-series engine as it uses a different bellhousing bolt pattern.

1 Overview
2 Sources
- 2.1 Ratios
3 Dellow Swap Kit
- 3.1 Clutch
4 Mounts
5 Custom Bellhousing
6 Tunnel Mods
- 6.1 Datsun 1000 Tunnel
7 Suppliers

Overview

The Toyota box, being of the split case design, makes it easier to maintain should you be the type to switch gearsets or perform your own overhauls. Toyota and aftermarket suppliers offer a large range of different gear ratios to suit your needs. It has a shorter throw.

More details on the T50 transmission: Toymods

The Datsun speedo cable hooks straight up to the T50

Sources

The T-50 transmission is found in rear-wheel-drive Celicas, Corollas and Sprinters. For example with 3TC or 2TC engine. Essentially the same box but the 3T has the larger input shaft bearing. This is important to know as Dellow has different bellhousing to suit each box. In Australia its about $250 for the gearbox (which you can purchase from elsewhere). Pick-a-part is $150 for any 5-speed.

TAxx series Celicas. Good for up to 200 hp or so
TExx Corollas/T-18
AE86/Sprinter Corollas

Any Toyota with a T-engine or a RWD Toyo A engine

Count the splines on the output shaft, the stronger T-50s had 22 or 23 spline, the weaker ones 20 spline. The t50 bellhousing has a paper gasket between it and the gearbox. If it leaks it has the gear oil smell (sulpur/crappy smell) unlike engine oil.

There are 3 different types of T50.

early one (Celica). The early one has the shifter sort of at the front of the extension housing
Middle (T18)
late one (AE86, AE71 etc). the late one has the shifter right on the end, where the tailshaft goes on.

The "strong" gearbox -- suitable for supercharged A-series -- is the late one, and it has a bigger front bearing, and a bigger output shaft.

To get a shifter than comes out closer to standard 1200's position, use the 2T transmission -- slightly forward of the Datsun position. If you have the stronger 4A transmission you can swap the 2T rear section to it.

The T18 gear stick is about 30mm back from standard.

3T has 22 output splines
2T has 20 output splines

both have 21 input splines on 23mm shaft

both have 7 bolts holding bell housing to the box and are split alloy cases.

You can also convert the T50 from overdrive 5th to direct-5th. Only $3000 for the close ratio cluster 1:1 5th gear.

Ratios

               1     2     3     4     5     R
T40 (A3)     3.587 2.022 1.384 1.000 ----- 3.484
T50 (4AGE)   3.587 2.022 1.384 1.000 0.861 3.484
W50 (Celica) 3.566 2.056 1.384 1.000 0.850 4.091
W58 (Supra)  3.285 1.894 1.275 1.000 0.783 3.768

http://www.dellowauto.com.au - Download the catalogue and it gives you some info on the type of box and what ratios are in it.

Dellow Swap Kit

Dellow Engineering (Australia) sells a bellhousing for this purpose. The cost is around $700 for gearbox and installation kit. The Kit comes with gaskets, clutch driven plate, spigot bearing and brass bushing for the new spigot hole.

The Dellow kit is not cheap, as it is more than an adapter plate. It actually incorporates the front part of the gearbox. The upside is that (in Australia) the T-50 gearboxes are inexpensive compared to Datsun 5-speeds. A good secondhand Toyota 2T/3T box can be picked up for around $250-300. And a modified tailshaft shouldn't cost more than $150.

It is slim, fits in the 1200 tunnel with no issues apart from removing the original mounts
Shifter stick comes out 25 mm further back, so you need to elongate the hole in the tunnel

Or, $1750 includes a Dellow kit with a reconditioned gearbox.

The kit will be about $800 but you would pay that for a used B310 5spd in Australia, and the Toyo box is a better, stronger box. Toyota box is basically unbreakable behind any A-series, better standard ratios (and more available through TRD if required), and has better shift action!!

In Australia, the strong Datsun 63-series 5-speed can be obtained for $900 or so.

Dellow sells the yoke to fit the T-50 22/23 spline for $100, good luck finding one of these at the wreckers.

The tailshaft from a mazda 929 wagon is also a close fit, check this out as well.

From ca18det_man:

With the dellow kit all you have to do is unbolt the front bellhousing and bolt on the new dellow adapter bellhousing change the clutch and spigot bush. the gear shift is back a little further than the standard datsun box around 30-40mm from memory. You will need to make a new hole as its around 70mm further back. the speedo cable fits up no problems you will have to remove the standard datsun gearbox mounting plates (humps out of the tunnel with bolt holes)and manufacture a new crossmember I used some 50x6mm flat plate and drilled holes in the appropriate spots and made sandwich plates for inside so the bolts dont pull through. A new tailshaft will also have to be made other than this I cant think of anymore work. The kit comes with most the bits and instructions so for anyone with a bit of mechanical knowledge shouldnt have to many troubles.

Price at Feb 2002 is $595 AUD for kit. This is approximately $310 USD (plus shipping, guess 15 kg with yoke)

Very Basic web site - [1]

If you get the kit from Dellow, you don't need a hydraulic clutch. It works with the standard right-hand drive cable. You may have to machine the sliding bit on the nose of gearbox to accept the Datsun release bearing, but possibly you could modify the level to accept the Toyota throwout bearing.

transmission
bell housing
installation kit
modify front of transmission thrust bearing race
modify Toyota driveshaft to fit Datsun diff
original crossmember mounts have to come out

There is a little bit of machining required to push bearing carrier and the bearing carrier slide. (this is because of the mix and match of Datsun and Toyota bits. Roughly it costs $1050 to do the conversion including all machining. discussion.

Give Jeff Dellow a call and tell him the Gearbox you have and then he'll tell you to sit down and then he will tell you about the price of the new bellhousing and all the rest of it..

Dellow also makes adapters for Rover/Buick V8 to Toyota Supra W57/W58 gearboxes for your more radical Datsun 1200 swaps.

Tunnel Mods

TOYOTA 2T OR 3T 5-SPEED BEHIND DATSUN

Clutch

The Dellow Kit uses:

stock 1200 clutch cable
1200 release bearing fork/lever
A Toyota clutch plate cut down to 180 mm and a Datsun pressure plate
Dellow sell a stronger clutch plate for $95 (plus $10 shipping), they specially make this clutch plate. The clutch plate they send out is identical to the one in the A15 heavy duty kits (PBR), with the centre changed to suit the toyota spigot/input shaft

BigV used a Toyota Sprinter clutch plate (190 mm?) and pressure plate. He had the local machine shop redrill the flywheel and shortened the bolts as they came out behind the ring gear. He also got the machine shop to fit bigger dowl pins this made up for the shorter bolts. Result: a very big clutch read same outside diameter as flywheel.

dattoman1000 uses the 200mm R321 toyota clutch kit with a Datsun bearing.

Mounts

The crossmember is the easy part to the T50 conversion. Use some 50 x 6 steel for mounting the box on with some sandwich plates to hold it to the floor. Very solid.

Custom Bellhousing

Toyota T50 with Datsun bellhousing

Sealing the front of the box seeing as the original Toyota bellhousng has the seals built in: The Toyo bellhousing was also machined & the relevant parts liberated & sandwiched between the 56-Series Transmission bellhousing/adapter & the box itself.

Vixen used a Datsun 60-series bellhousing cut with a plate to mount the T-50 box.

Tunnel Mods

Depending the T50 you get, it can definitely fit into a stock 1200 manual-transmission tunnel. You will need to remove the stock 1200 gearbox bosses from inside the tunnel

Other T50s reportedly don't quite fit:

A bit of work with an angle grinder on the top of the box may help. Cut a bit (not much) off the top of the box, don't go too far!
Some have massaged the tunnel opening with a hammer
Other have cut the tunnel right down the middle from the firewall to the shifter hole and opened it upwards.

Datsun 1000 Tunnel

The 1000 transmission tunnel is a bit smaller than a 1200 tunnel, even the 60a is a tight fit requiring with an angle grinder, the 63a and Celica box will need the transmission tunnel opened up some.

In your 1000 ute, with a14 and modified engine mounts, no modifying of the tunnel was necessary, and you can see the two holes in each floorpan where the custom Xmember bolted with sandwich plates. You may have noticed that Shaun welded new humps in the tunnel to bolt in the 4-speed, these will need removing again. It surprised me because with the same gearbox the tunnel in my 1200 required some major cutting, and the rear of the box sits about 2-2.5 inches higher.

Reference and gearbox mount pics: Dellow 5 speed into 1000

Suppliers

Castlemain Rod Shop

Dellow Engineering 
37 Daisy Street 
Revesby 
Sydney, NSW 2212 
Ph: (02)9774 4419 / (02)9774 3873 
Fax:(02)9774 4783 
Mail address: P.O. Box 43, Revesby North, NSW 2212
Address fax to Jeff Dellow, or to Danny

More info:

Retrieved from "http://datsun1200.com/modules/mediawiki/index.php?title=T50_5-speed"

T50 5-speed

Revision as of 04:01, 12 April 2013

Contents

Overview

Sources

Ratios

Dellow Swap Kit

Clutch

Mounts

Custom Bellhousing

Tunnel Mods

Datsun 1000 Tunnel

Suppliers