Thread: Adaptor shaft

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Forgot to label the diagram - left to right - oil hole without seal 60mm approx, SAE10 input gear 30 mm approx, 30 spline involute gear from v8 gearbox 33mm approx.

Assuming you want to keep this as a simple floating shaft that can be extracted from 1.00 and other boxes.

To go larger than SAE10 then you either need to find a larger diameter oil seal or remove the oil seal altogether and fill your adaptor case with oil (how leaky are the Sheldon cases?) If you ditch the oil seal you can now move away from the first restriction, that of the oil seal landing size as it currently stands.

If you want to go stronger than SAE10, then by example go 30 involute as per my gearbox behind the v8. Have the SAE10 splines in your input gear milled out and replaced by 30 involute.

Want to go bigger? Then you are only limited by the amount of thickness you dare take off the wall of the input gear body.

It seems a hole is drilled 'half way' into the gear. The hole is much larger than the hole required for the splines. I assume the oversized hole is for tool holder clearance (just a guess - don't flame me!) - ie the oversized holes are 39mm and 38mm on the sketch.

Your next limitation is the hole for the oil seal. You could easily go up to 58mm, by which time you will have milled your gear completely away

The figure of 52mm is the outside diameter, measured where the lube holes are drilled. I have not checked if any part of the gear is thinner elsewhere along its length.

Just off the phone to Greg at Outcast.

He does not have the length of Sheldon's adaptor to hand, but he believes the Outcast unit should fit a Sheldon case.

I mentioned elsewhere, as an example for you, one of his customers with an Outcast adaptor kit behind a high powered twin turbo 4bd1t without breaking it. This customer also has another RRC but with a Sheldon kit. The case has been rewelded. The customer has approached Greg with the idea of replacing the Sheldon shaft with an Outcast shaft.

I am going to order another for myself as a backup when the other order comes in. Milling a few is cheaper than trying to get one offs.

Any other takers?

Other bits of info from Greg about their decision making processes:
- Marks adaptors at one stage tried a two piece unit for the Hilux, but it kept breaking, so went back to the one piece
- the internal spline cutting required in a two piece adds significantly to the cost

On Greg's suggestion I have just talked to Barry at Hi-tough (no website). Barry is happy to look at the two piece idea and give some comment, but it will be several weeks as he is snowed under with work. I'm emailing the drawing of the simple SAE10 floating shaft going through the oil seal landing - see above somewhere.

Reading that, my adapter housing my not be true, will strip it and measure it when i get home.
I do however like the idea of not having to remove the transcase though it it breaks again.
I wish i could remember how my lt95 adapter was done, that didn't break with a holden stroker and 6.5 litre chev diesel

Here's some metal mangling that looks interesting now you mention the lt95 and chev in the same breath.

http://www.aulro.com/afvb/modified-z...0r4-trans.html

You still have the 6.5 and plans for it?

Sold that big heavy hunk of junk years ago, seen the light now with the isuzu.
Although off idle torque was amazing and it sounded so awesome, but that was it

My conversion was a Rovercentre conversion, it was really well done, so simple

Adapter shaft length is 194mm

See post 38 for a scale drawing of the Outcast unit which has an over all length of 184. I measured the shaft by placing it on its pointy end (the SAE10 end) on a flat surface. I did not measure it while the shaft was lying on its side.

Need to work out where your 10mm difference is.

The oil seal landing is the point likely to be common to both shafts. The oil seal landing on the Outcast is 28mm long (not the diameter).

From the MSA side of the oil seal landing to the input gear end of the shaft the distance is 130mm - the 'right side'

From the MSA side of the oil seal landing to the mating face of the drive flange is 54mm - the 'left side'.