Australian Belly Tank

[Dr Goggles]

 It's 1070mm or 3 ft 6 inches from the firewall to the rear bulkhead in the tank, that's all we have for the motor and box, there are other boxes that we could have used but for all practical purposes there was no comparison,cheap, will handle 400hp, reverse in the extension which is easily removeable

Put the kettle on, I'm bringing the input shaft over....

[grumm441]

Well that fixed it
g

[Milwaukee Midget]

Holdebond?

[Dr Goggles]

did you count any teeth? no, not on the people who live in your street....no secret that would total zero....

[grumm441]

No
G

[Jon]

Dot of white paint on input and output shaft, select a gear and count how many turns of the input to get ten turns on the output shaft.

Bob's you auntie's live in boyfriend.
jon

[grumm441]

Dot of white paint on input and output shaft, select a gear and count how many turns of the input to get ten turns on the output shaft.

I'll send you my address and you can come around and show me

Bob's you auntie's live in boyfriend.
jon

And Bob. He's my younger brother, so that's just weird

G

[Jon]

Didn't know you we're Tasmanian Grumm

[Dr Goggles]

Dot of white paint on input and output shaft, select a gear and count how many turns of the input to get ten turns on the output shaft.
jon

He has the parts out of the box, he can count the teeth.... and his little brother's name is Robert, get it?

I just had a look on some Holden nerd forums and it seems we've gone from 3.05/2.19/1.51/1 to 2.54/1.83/1.25/1.... It's a good change we've made , it'll help a lot, last time we ran we were putting on 12mph/mile through the last three,  being able to stay in third much longer and yes Grumm having probably half as much power again is going to make a bit of difference.With the rear end ratio change we will have a comparative 1.35:1 compared to the old 1.51 so not a huge leap but every little bit helps......

I got the piece of aluminium I'm using to make the helmet padding support in the top of the cage bent nicely, I have pieces for the sides done, I just need to work out a neat, discrete way to attach it all.Finished coping the last new bit of tube for the top of the cage too. Made a start on the bracketry for the steering column support, stuffed it up, came inside , sat down....had a better idea. Start again tomorrow.

ps. The angle grinder job I did on my finger has just finally closed over, 3 weeks.

[grumm441]

Did you slip in an extra gear when i wasn't home?
G

[Dr Goggles]

Info on the Australian GM boxes from GMH-Torana.com...make up your own mind ...

3.05/2.19/1.51/1.00 (Cluster Part No. 2813496) This is the most common version (normally called the M20) & is available with both 6 & V8 front shaft lengths.

2.54/1.83/1.38/1.00 (Cluster Part No. 2813497) This is probably the 2nd most common box & is standard fitment behind 308/5.0 V8s (normally called the M21) & is usually only seen with a V8 length front shaft, although there was a 6-cylinder version homologated as a alternate choice of ratios for the LJ XU-1.

3.74/2.68/1.68/1.00 (Cluster Part No. 2820694) This is the ‘wide ratio’ box (normally called the M22) that is usually only seen in 6-cylinder HQ-WB One-Tonners. It was only ever factory built with a 6-cylinder length front shaft, but since the clutch gear is the same as an M15 3-speed box, you could use an M15 V8 front shaft & make a V8 M22 if you really needed one.

2.54/1.83/1.25/1.00 (Cluster Part No. 2823899) This is the box that is often wrongly referred to as the 6-cylinder M21, when it was actually called the XU-1 M20 (by GM-H). It was standard issue in XU-1s (with a 6-cylinder front shaft, obviously) but the same ratio set was also homologated as an alternate unit for racing for the L34 (with a V8 length front shaft).

2.54/1.65/1.25/1.00 (Cluster Part No. 9939484) This is probably the rarest box of all, as it was only seen as an homologated alternate unit for the LJ XU-1 & the LH L34, with their respective 6-cylinder & V8 length front shafts.

[Dr Goggles]

does it clunk in second?

[SPARKY]

What is your target shift RPM? with your new setup???  8500

[grumm441]

I checked them and they're all quiet.
I'm just a bit confused about how we get all those ratio changes with the amount of gears you gave me
G

[grumm441]

I checked them and they're all quiet.
I'm just a bit confused about how we get all those ratio changes with the amount of gears you gave me
G

Ahhhhhh. now I understand
the gear on the input shaft is a reduction gear to the layshaft.
when you select fourth, it connects the input shaft directly to the output shaft.
G