Guys,
Can anybody please tell me the recommended clearance between the diffhead flange and the rear universal flange on the B110.
I have just replaced my rear g/box seal with a genuine Nissan item ( and yes it is fully in to the back of the g/box ) yet I would be struggling to have 3-5mm which means to get the drive shaft on and off I have to use a large lever and push the drive shaft hard forward which cannot be good!
All the mounts are factory and untouched so I'm really scratching my head over this one and cn but conclude that it has something to do with the car being lowered.
Cheers
Dave

When I got my tailshaft shortened they said 25mm-ish.

I think if you lower the back more than the front (or maybe the other way around?) it will make that gap shorter.

Have you changed the way you supported the car when you jacked it up. If the axle is up as in on the road then the axle is further back because of the angle of the springs. If you jack it up and let the axle hang down then the axle comes forward. Situation normal and don't worry about it.
olboy

Hi Oldboy,
Thanks for your reply.
Yes, I've tried it with axle stands in front of the front eyes of the springs and also by jacking the diff up and the axle stands underneath the diff- no difference.
I am running flattened springs with extra leafs which I assume explains why things raen't moving.
Back to the drawing board

I've heard 2.5 cm (25 mm) with the tailshaft pushed all the way into the transmission. Dunno how true that is?

got mine done not long ago by a old guy that done for years

im pretty sure he also said 25mm

but it changes when you lower it
i recall when i raised my ute at rear the handbrake cable got hell tight so that must mean there may be a bigger gap when high
shorter gap when lower
if there no gap it will wear the seal in back of box out i think

ring any tailshaft guy up and ask they will know for sure

You want about 25 - 30 mm between the gearbox seal and the shoulder on the front uni nose when the car is on the ground and at rest. When your rear suspension is in BUMP (compression) the nose of the tailshaft will be pushed further into the rear gearbox seal because the arc lenght of the geometry is reduced therefore forcing the tailshaft spigot into the rear of the gearbox.
Maybe when your rear springs were straightened the diff nose position moved forward. It is important to check the clearance when car is at rest on the ground, jacking it up, again depending on the geometry might cause changes. Measure it at rest and if there is 20+ mm clearance its all ok. Remember the 20+ mm will be at its longest distance when car is on the ground and reduce as rear suspension goes into bump or rebound.

Quote:
The front suspension ride height has absolutely no effect whatsoever on the distance from the back of the gearbox to the pinion drive flange.

If the distance that you can push the driveshaft into the gearbox is so short that you cant remove it from the car then a number of possibilities present themselves.

A. There is something inside the sliding part of the uni yoke preventing full & free movement.

B. The engine & box are further back than standard. [Later model engine swap not done properly? i.e. A15 into 1200 chassis]

C. The rear axle assembly is further forward than standard. [are the springs the right ones for the car? Check the distance from the center of the front spring eye to the centerbolt & compare with another car of the same model.]

D. Gearbox longer than standard. [is it an original Datsun gearbox?]

E. Have you got a passenger model driveshaft, like one from a 120Y or Sunny, in a 1200 Ute or a 1200 car with a Ute rear end?
The Ute uses a shorter driveshaft because the H165 pinion flange sits further forward from the rear axle centerline than the H145 or H150 does.

Thanks for your thoughts Dodgeman- much appreciated.
To answer your points in order:
a) everything seems okay with the driveshaft yoke.
b)The front crossmember is a Roadstar 1200 ute one so this is all a factory bolt in.
c)The springs are the original ones that were on the car when I first bought it and it was stock- they have been flattened with extra leafs added.
d)The gearbox is a NIssan A series 5 spd c/r- to the best of my knowledge they are no longer than a standard 4 speed?
e)This is a possibility- it is a 'new' rebuilt driveshaft that I have a funny feeling may have been out of a stationwagon BUT measuring it against the origianl one that can in the car ( but had also been rebuilt- or exchanged? ) they are the same length.
I'll take it back tomorrow and talk to them but at this stage it is looking like I need around 20mm pruned off it.
Cheers
Dave

The 60-series 5-speed are the same length as the 1200 4-speeds. The 63-series may be a different length(?)

Wagon/Van, Coupe, Sedan and ealry Ute/Truck are all the same wheelbase, and use the same tailshaft.

As pointed out before, Newer Ute and wagon/sedan/coupe differ. The tailshaft for H165 should be a bit shorter.

If anyone has a late ute (H165) tailshaft, can you measure the various parts and put the dimensions here? Propeller Shaft Swaps - Dimensions