Gearbox Problems?

bigcol · Post by **bigcol** » Wed Sep 16, 2009 4:52 pm

51 M38 MC 11116 Work-in-Progress

As handbrake still not fixed, I placed jeep into gear to stop it rolling yesterday and noticed it still moves freely. Does this mean I have a gearbox problem?

Appreciate any feedback.

Col

dv3468 · Post by **dv3468** » Wed Sep 16, 2009 5:50 pm

Make sure your transfer case is not in neutral, if it is the jeep will roll freely even though the transmission is in gear.

Post by **wesk** » Wed Sep 16, 2009 9:33 pm

Leave it in high gear not 1st or reverse. when you leave it in a low gear the weight of the jeep can use the multiplication of power you provided with the low gear ratio selection to move the pistons past their top compression positions.

oilleaker1 · Post by **oilleaker1** » Thu Sep 17, 2009 7:11 pm

If it rolls in gear, and your tranfercase is NOT in neutral, your clutch is shot or not engauged! Keep us informed!

John

Post by **wesk** » Thu Sep 17, 2009 10:24 pm

With the tranny correctly in gear, the transfer engaged and the clutch fully engaged the truck relies on the compression of the engine to hold it in place. When you select first, second or reverse the high (low #'s) gear ratio acts like a reduction gear box and doubles the load against the compression of the engine.

A slipping and worn clutch will also allow the truck to roll but you should have already noticed the worn clutch issue when driving it.