slipping out of reverse

Subafury · Post by **Subafury** » Sun Sep 23, 2007 12:27 pm

just recently in the last 2 weeks whenever i reverse for more than like 3-5 metres it clunks out of gear with a horrible grinding sound. it stays in a little longer if i hold the gear lever down, but still pops out.
ive had a look and play underneath but couldnt really work out how to fix. any suggestions?
also ive noticed this replacement 3.9 gearbox is leaking a fair bit of oil from everywhere underneath.

hopefully its an easy fix

Brumby Boy · Post by **Brumby Boy** » Sun Sep 23, 2007 2:10 pm

i had this same problem with my old brumby 4speed, but saddly i never got around to fixing it sorry

plucky · Post by **plucky** » Mon Sep 24, 2007 9:59 pm

I had exactly the same problem earlier in the year. Worn gears in the box. The only solution is to replace them. I replaced mine with a second hand set from another box, so far it has been O.K. Be careful not to put too much load on reverse. Try to avoid situations where this is necessary. This seems to be a common problem down this way. My brother also has one that has this problem, he has managed to keep it going for years by not loading reverse gear to much.

Matatak · Post by **Matatak** » Mon Sep 24, 2007 10:07 pm

BAHAHAHAA i was also thinkin worn gears kicking it out
but that wuld be hilarious you being up for yet another box..time to get one in mint condition LOL

(sucks for u btw)

Subafury · Post by **Subafury** » Mon Sep 24, 2007 11:29 pm

oh

that seriously sux if its the problem.

im going to try mess around with the mounts. and see if it helps. amybe even take it to a mecchy

subgiraffe · Post by **subgiraffe** » Tue Sep 25, 2007 8:19 am

Had this in my old MY wagon - kept it going for a few years by just holding the lever when reversing - doesn't take much force to keep it in gear

Subafury · Post by **Subafury** » Tue Sep 25, 2007 2:02 pm

well ive tried holding it in- but when im in boggy sand for example it comes out no matter how hard i hold it in. might have to do another box swap. grrr

steptoe · Post by **steptoe** » Tue Sep 25, 2007 2:07 pm

always thought slipping out of gear was a detent spring somewhere that has broke - maybe not in subies from the sound of things

AndrewT · Post by **AndrewT** » Tue Sep 25, 2007 5:35 pm

weird thing is that box didn't do that in the last car it was in (my old wagon). It was reversed in really boggy sand plenty of times - although it only ever had the power of a very tired EA82 carby motor on it.
It's an old box with lots of kms so its quite likely the gears are abit worn.

BrennyV · Post by **BrennyV** » Tue Sep 25, 2007 5:40 pm

syncro?

.

AndrewT · Post by **AndrewT** » Tue Sep 25, 2007 7:58 pm

reverse doesn't have synchomesh

Subafury · Post by **Subafury** » Tue Sep 25, 2007 8:05 pm

i swapped a mount that seemed a little dodgy today and tightetened my middle one. put an extra rubber bit on the x member that i found, but none of this helps. if anything it pops out easier now.

anyone got a 3.7 box handy?

90brumby · Post by **90brumby** » Tue Sep 25, 2007 8:24 pm

maybe even check the engine mount maybe the engine is causin the box to move a large amount and there for pushin it out of gear

plucky · Post by **plucky** » Tue Sep 25, 2007 8:31 pm

In addittion to my earlier post:
The teeth on the gears wear to the point where they are slightly tapered. It dosen't take much (you have to look pretty hard to spot it). Reverse is straight cut, and just relies on engaging the gear teeth, unlike the forward gears where a sliding sleeve locks the gear and the hub together. When force is applied this is enough to push it out of gear. Worn bearings would not help either, allowing the gears to tilt, making the problem worse. I don't know about other models, but I know that there are at least 2 different sets of internals for MY. Although they look the same, they are dimensionally different.

Subafury · Post by **Subafury** » Tue Sep 25, 2007 10:21 pm

cheers for the info, particularly plucky. i also called up a gearbox place and asked their opinion. he reckons it sounds internal too. so im gonna do another swap. unless someone wants to do it for me lol

Matatak · Post by **Matatak** » Tue Sep 25, 2007 10:25 pm

with wt box this time