Automatic with no reverse??

[gaducker]

I have found a 5 ton in LA, Its an auto but the owner says reverse is out. Anyone know whats involved with getting a trans repaired? Is this something a regular ole trans shop could work on? Or is this something I could repair on my own? its an 85 model if that makes any difference.

 

[porkysplace]

Nothing a few grand and a Allison dealer can't fix. A regular trans shop won't fix it , any major repairs your going to do it yourself or a heavy truck shop.

 

[mkcoen]

Or you could do what I did through my senior year in high school ('68 Pontiac Le Mans with no reverse). Just don't park where you have to back up

 

[gaducker]

So its an Allison transmission in it?

Which allison?

 

[armytruck63]

MT654. Maybe you just have an out of adjustment linkage or something binding in the shift tower.

 

[porkysplace]

You have these downloaded right ?
[h=3]TM's for the 939 series trucks[/h]

 

[KaiserM109]

I recently lost low gear in my 923A1. An overhaul is horribly expensive. I bought a pull-out from 91W350, Glen, in Salina, KS. I hope that after next weekend it will be installed. Glen scraps trucks occationally, so you might PM him and see if he can help you, OR search this web site for someone a little closer who is parting out a truck. If you do your own work, remember the transmission weighs 400 lb.

 

[jcappeljr]

I have a trans I just pulled from a m923a2.$750

 

[gaducker]

I have a trans I just pulled from a m923a2.$750

I have not seen the truck yet but will this week. I will keep this in mind.

 

[Csm Davis]

I will have some pullouts for 500 by next week. Give me call if you would like one.

 

[Scar59]

If reverse is truly gone, (internal issues and not externally caused) most likely 4 gear is out too. Takes 4th to make reverse. Their big and heavy but with manual and tools they can be rebuilt. Good folks at ATS Transmissions, Ft. Worth Tx,
probably have everything you need, reasonable priced. I'm just about the crack open and fix a AT 1545 Allison out of my A3, then a take out replacement will be easy to just swap, hopefully it lasts. Double check all the vent lines to the trans, plugged vents kill more Allisons.
JC

 

[sc3]

I have read on this forum that there is some type of reverse lockout that when the transfer case is in low the transmission won't go to reverse. I don't know where it is on the truck and or how it works (I've been searching but can't find explanation). I think it was a mwo that not all trucks received, maybe someone will chime in to explain how to figure out if your truck has lockout or not.

 

[gaducker]

Anyone got a pic of this reverse lockout?

This things only got 13k on it, Could reverse be worn out that quick? ANd they said it goes down the road so I assume all the other gears work.

 

[gaducker]

Anyone got a pic of this reverse lockout?

This things only got 13k on it, Could reverse be worn out that quick? ANd they said it goes down the road so I assume all the other gears work.

I found out its an 1983, Are the trans interchangeable between a lot of years?

 

[Csm Davis]

Yes as far as I know all 939 share the same transmission

 

[gaducker]

This is it, Is this a 939?

 

[armytruck63]

The series is M939 and that particular version is an M923.

 

[gaducker]

He says it wants to pull in reverse but just wont pull itself. What Allison trans is in a 1983 923?

 

[gaducker]

I recently lost low gear in my 923A1. An overhaul is horribly expensive. I bought a pull-out from 91W350, Glen, in Salina, KS. I hope that after next weekend it will be installed. Glen scraps trucks occationally, so you might PM him and see if he can help you, OR search this web site for someone a little closer who is parting out a truck. If you do your own work, remember the transmission weighs 400 lb.

I have searched all last night and this morning and have not found for certain a similar prob with a positive out come as far as a repair is concerned. These trans are divorced so getting them out should not be a big problem with it on the lift and with a trans jack. At least I don't think they should be that difficult to get out.

 

[gaducker]

I will have some pullouts for 500 by next week. Give me call if you would like one.

Well you are much closer than pa, plus we come that way a lot going to casinos.