chrisstdt

chrisstdt

Well-Known Member
Picked up a 2a yesterday ,she's been sat since 2015 and seems to be in fairly good order

When diving I 4x4 or low box both wheels seem to bind slightly (brakes aren't sticking)

Is it possible the diff has seized with standing or should I be looking elsewhere?
 
What do you mean by binding? You don't need to be driving in 4wd on tarmac in a series, there's no centre diff and UJ joints in the front hubs
 
Only driven it at low speed but you can feel the wheels trying to lock up

It left marks on the trailer when driven on and off
 
Select normal 2wd and try again.

Put it in 4wd and in gear, lift one wheel up you shouldn't be able to turn it post the slack in the drivetrain. Lift both wheels up and they should spin freely, in opposite directions
 
Not un known for a later rangy diff to be fitted by mistake, although if this were the case the truck would be hopping and shipping in 4x4 .
 
Yes comparing how many turns of jacked up wheel to number prop turns
Do on front and back and should be same
If you need to drive it a bit , just remove front prop
the two diff ratios I recall are 4.7 and 3.54 people put on the 3.54 to lower the revs when cruising
 
To check do as Steve says, with truck in 2 wheel drive jack up a front wheel and put a mark on the prop. Turn wheel one revolution and count how many times the prop goes around. Same with the rear. Count should be the same. Having driven one with odd diffs fitted in 4wd it hops and skips on a hard surface like a barsteward.
 
It might be more clearer to turn the wheel twice then you get either 9.4 turns or about 7 turns of prop , bit of white paint on prop will help count
 
tottot said:
To check do as Steve says, with truck in 2 wheel drive jack up a front wheel and put a mark on the prop. Turn wheel one revolution and count how many times the prop goes around. Same with the rear. Count should be the same. Having driven one with odd diffs fitted in 4wd it hops and skips on a hard surface like a barsteward.
Click to expand...
Hops and skips like a barsteward describes it quite well !
 
steve2286w said:
It might be more clearer to turn the wheel twice then you get either 9.4 turns or about 7 turns of prop , bit of white paint on prop will help count
Click to expand...

Be careful not to overllok that the differential gears are also involved.

One way to see this is to split the motion into two parts.

Imagine both wheels are off the ground and free. Turn the prop in the normal direction by 4.7 (or whatever the final drive reduction ratio is) turns. Both wheels will have turned forwards by one turn, and the differential gears will not have turned relative to each other.

Now, hold the prop still, and turn one wheel back one turn. The other wheel will turn one turn forwards, owing to the differential gears.

At this point one wheel will not have turned at all, and one wheel would have turned twice, i.e., this is equivalent to one wheel on the ground,and one wheel free.

So, with one wheel one the ground, it takes 2 turns of the free wheel to get the final drive reduction ratio number of turns at the prop shaft.

Another way to see this is to imagine the differential gears directly. The sun gear of the fixed wheel remains stationary. As the free wheel is turned, its sun gear turns the planet gears which "walk" around the fixed sun gear. As the motion to the crown wheel comes from the axle in the planet gears, this moves half as far as the pitch point of the moving sun / planet gear mesh.
 
After I posted I wondered whether I was misunderstanding the diff bit, still don’t know for sure how they work but many thanks for explanation , I’ll google a video and read again
 
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