Hey guys, my work mate has just started a WB One-Tonna project... It currently has a Blue 202, and Trimatic.
He's just after a nice cruiser and not a ball tearer and wants to fit a Mild 308... my question is... Were the diffs the same in both the 6 and V8 1-tonnas? It does have a 10bolt diff... Im guessing the housings are the same just different ratio centers? so would it just be a matter of fitting a suitible center? Is it easy to get a LSD for these diffs? How much HP/Torque will these diffs handle?
Also are the brakes the same between the 6 and V8 models? if not whats different?
Tailshaft seems fairly beefy, so looks ok.... but are the V8's with a Trimatic or might be a T350/T700 are they all the same length/spline?
Will V8 engine mounts bolt straight onto the 6 crossmember or will he need to source a V8 crossmember?
And is there anything else you can think of that will need to be changed... Springs?
Thanks guys.... I know its not a Torana but is soo many knowlageable people on this forums. Cheers!
If it's originally a 202 trimatic it will be a 3.55 diff. Standard diff for a 253 trimatic is a 3.36 but plenty had 3.55. All 1-tonner diffs are identical. LSD's for these are identical to all HQ-WB V8, A9X and 308 VB-VK. They are getting hard to get though and 2.6/2.78 centre is also different. In all honesty if you want to have a taller LSD you'd be better off getting a 9" made up for it or getting a VN diff modified.
Note: 1-tonners use the same yoke and rear uni as all HQ 350 powered cars, and the uni is also identical to the front uni on all HQ-HZ with TH400. HG 350 also used the same uni.
All you need to put a 308 in it is:
A blue/black 308 and trimatic (just make sure you get one with the shift on the same side);
253/308 exhaust;
WB V8 auto radiator (or manual one with a separate txm cooler);
WB V8 throttle cable;
WB or VC-VK engine harness;
V8 trimatic dipstick.
Note that all tonners had heavy duty bits, regardless of whether they were 6cyl or V8. These were:
Heat treated front stubs (absent from very early HQ);
Bigger rear axles with wider bearing collars;
Big tailshaft;
1.125" front and rear unis;
Fully perimeter welded rims.
Different upper control arms and balljoints are also listed for WB tonners but i'm not sure what is different.
Front springs are different for 6cyl, but just buy some aftermarket V8 ones.
You'll also probably have to change the gear on the end of the speedo cable as V8 trimatics normally have a different gear inside.