Drive line SOS

[LS120]

hi guys in need some objective out side help....

i have a 202 with a new cluch,plate & bearing, has a holden 1tone 4speed box & cresta diff head in bedford diff.

my problem is that when i put the holden box in (has been checked & all ok inside) forward gears are fine but reverse wants to throw the motor out of the cab..   

i mean it real bad.. the whole diff shakes..

any help anyone.

when i had the bedford box in (4 speed) i had no problems at all.

thanks.

[Jeff]

If the diff shakes, then I wonder if the rear brakes are binding in reverse?

[Numnutz]

Have you checked out the uni joints? I've had broken uni's do something like that.

[hotrod]

wants to throw the motor out of the cab..   

had something similar in an esky van many years ago
the bolts around the top of the bellhousing weren't done up tight.

[Banksx2]

A stuffed engine mount can be a sneaky one to find - they look fine but change them out and the dodgy one will fall apart in your hands.

[Bas NZ]

Don't use reverse.... These problems can be hard to find, What changes when the persure is but on the van in reverse? you will find the answer within this. Cluch setup maybe. as mounts you think it would be there all the time, but then the same could be said for the cluch, check the pressure plate? I know its new But .............. worth a recheck - springs etc.

[Merlin]

it dont matter what gear your in the clutch/pressure plate spins in the same direction i would be looking at the tailshaft either uni's ,extension housing bearing or pitch angle as you did say you changed the box it may be muonted to high/low causing binding of the uni     Cheers Neil

[ben]

id think it would be more likely to be engine mount. over clutch

driving forward engine is pushed into the broken mount.

driving in reverse, engine is pulled away from mount causeing unbalances to occur all the way through the driveline.

ben

[Jeff]

Because reverse is a lower gear than first, the whole drive line is under less stress in reverse.
The only thing that changes is the rotational direction of the gearbox, driveshaft, diff. and wheels.
Something must be binding, and to me the obvious suspects are universal joints or brakes, unless there is a broken tooth on the reverse idler in the gearbox

[Jeff]

id think it would be more likely to be engine mount. over clutch

driving forward engine is pushed into the broken mount.

driving in reverse, engine is pulled away from mount causeing unbalances to occur all the way through the driveline.

ben

No I don't think so Ben
The motor still turns in the same direction.