Originally Posted by Ganmain Tony (Post 119589)

Great info Cliff once again. Sorry about my faux pas with the cmp/chev bits. Does this mean the truck has a four speed box & that I just could get it in the gate?

Incidently - how difficult is it to get 18 inch tyres & tubes to suit??

Is that your truck in the first picture - it looks fantastic. :thup:

Originally Posted by Tony Smith (Post 119681)

The Chev 10 stud pattern uses smaller dia studs on a smaller PCD than the regular "wide 5" pattern used on other trucks. And 40's Fords have a different stud PCD to the more common Dodge/Inter truck wheels of the 60's and 70's. :(

Bob McNeill has raised a pertinent point regarding the spacers for the hubs (or spacing of the rims).

The pre-war 20inch wheels used on Fords and Chevs generally ran smaller tyres such as 6.00-20 or 7.00-20, while later trucks went to sizes such as 7.50-20 and 8.25-20. There are specific rims to suit each of these tyre sizes, and in some cases hubs too. The obvious reason is that wider tyres will require a wider rim, and dual wheels will need greater offset so the wider tyres dont foul each other when "bagged" out under load. But a more specific reason is that the centreline of the front tyre must be in a particular position in relation to the Kingpin Axis for it to steer safely and acheive optimal tyre wear. Putting a large dia tyre on a rim with offset for a smaller tyre will have the contact point in the wrong place. With the contact point in the wrong spot, steering effort will be increased. There was not a lot of camber and caster adjustment built into the design (ie: Nil!) of the front end, so it is critical that the correct combination of bits is used to set it up safely.

Originally Posted by Ganmain Tony (Post 119724)

Critical info to stop me finishing up over a Cliff

Originally Posted by Ganmain Tony (Post 119756)

Two other questions I'll pester you Chev lads about..

Has anyone got any photo's of the metal bits of an old timber back? Meaning recent shot's of one that's an original. (Ambitious I know, but here's hoping)

Originally Posted by cliff (Post 119774)

Photos taken by Tony Smith so he may have high Res one's you can beg :cheers:

Originally Posted by Tony Smith (Post 119782)

If you're willing to beg, I can do better than the same 'ol pics. I could get detail pics of that tray and measurements.

Originally Posted by gjamo (Post 119803)

Heres a variation on the design. I guess from a different manufacturer. Although this body is a tipper also.
Graeme

Originally Posted by Tony Smith (Post 119782)

If you're willing to beg, I can do better than the same 'ol pics. I could get detail pics of that tray and measurements.

Originally Posted by cliff (Post 119802)

Tony, Tony can do the begging but can I have a copy of the detail photos plus measurements for my records as well please? You just never know I may decide to trade my present 'Truck' in on an MCP one day and will require a few details like that :thup:

Originally Posted by Ganmain Tony (Post 119814)

That would be sensational Tony :note: - a timber suggestion would be extremely helpful as well. Ill take Max's idea & go old cattle yard raiding probably.

Originally Posted by Seaforthpiper (Post 119869)

It's a four-speed - if you look you can see the 'reverse' lever on the side of the shift rod.

Originally Posted by Dinty (Post 119883)

G'day All, A 4 speed box is just that '4 forward gears' + reverse cheers Dennis :sheep:
ps reverse is never counted in the 'speeds factor' unless maybe it's a 'Champ',,. :cheers:

Originally Posted by Ganmain Tony (Post 119893)

Thanks Dennis,

I repeat my question - does this truck have a four speed gearbox & one reverse gear or is it a 3 speed box with one reverse gear.

Does this vehicle have the same gearbox as the Chev Blitz?

Originally Posted by Ganmain Tony (Post 119893)

I repeat my question - does this truck have a four speed gearbox & one reverse gear or is it a 3 speed box with one reverse gear.

Does this vehicle have the same gearbox as the Chev Blitz?

Originally Posted by Tony Smith (Post 119943)

The only way to tell is to have the two boxes on a bench side by side, or to have the PROPER parts books and compare part numbers.

Originally Posted by Tony Smith (Post 119943)

Drawing on my vast Chev knowledge ( :doh: :yappy:), the gearboxes available at the time were similar to the options offered by Ford. That is, there was a 3 spd synchro box in Cars and a 4 spd crash box in trucks. The crossover point was in around the 3/4 to 1 ton ute range. The GM 4 speeds will be broadly the same, with small variations like clutch/bellhousings, input lengths, spline counts, output shaft types and ancillaries such as handbrake locations.

There may be a chance that the box is identical to a Blitz, but more likely to be similar with interchangeable parts. The only way to tell is to have the two boxes on a bench side by side, or to have the PROPER parts books and compare part numbers.