M936 transmission stuck in reverse.

[redrustyhill]

You could tow it with your lawn tractor, that far.

Or I could do it the proper way!

Sent from my Pixel XL using Tapatalk

 

[gimpyrobb]

Dang, where is that popcorn smilely?!


That pic is fit for framing, if it wasn't on the trailer!

 

[Miswesttowman]

Using my wrecker in the local demolition derby. After lifting a car off the barrier I went to shift into drive and I went backwards right into the car I just recovered and he got stuck on my hitch. Regardless what position the shifter is in, even nuetral, the truck goes backwards only. Shift cable and shift arm are moving properly. Is this an "easy" fix or is the transmission FUBAR?


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Mine has done the same thing...what did you find out? is it fixed?

 

[simp5782]

Mine has done the same thing...what did you find out? is it fixed?

He ended up swapping in the transmission i sent him

I have another good used take out if needed.

Manual can be purchased for cheap on eBay. Has a full trifold section for diagnostic needs

Allison Transmission Manual MT MTB 644, 654CR | eBay

<p dir="ltr">Allison Transmission Manual, Dealer Edition . Condition is Good. Shipped with USPS Media Mail. Cover shows signs of wear. All pages and fold outs are there.</p>

www.ebay.com

 

[Miswesttowman]

He ended up swapping in the transmission i sent him

I have another good used take out if needed.

Manual can be purchased for cheap on eBay. Has a full trifold section for diagnostic needs

Allison Transmission Manual MT MTB 644, 654CR | eBay

<p dir="ltr">Allison Transmission Manual, Dealer Edition . Condition is Good. Shipped with USPS Media Mail. Cover shows signs of wear. All pages and fold outs are there.</p>

www.ebay.com

Well that sucks...bought the truck and used it one time. Not sure I have the equipment needed to work on this huge machine. They didnt build a 5 ton truck very robustly...

 

[simp5782]

Well that sucks...bought the truck and used it one time. Not sure I have the equipment needed to work on this huge machine. They didnt build a 5 ton truck very robustly...

You also Don't know the trucks history prior to you buying it, could have been abused.

M939s are fairly reliable. I have put em thru all types of abuse and usage than nearly anyone on this forum. Generally only get 30k miles from the Allison if it's being used in constant towing capacity.

 

[Miswesttowman]

You also Don't know the trucks history prior to you buying it, could have been abused.

M939s are fairly reliable. I have put em thru all types of abuse and usage than nearly anyone on this forum. Generally only get 30k miles from the Allison if it's being used in constant towing capacity.

We we got 12k out of this one. Looks like were going to need another. Got a good one laying around?

 

[simp5782]

We we got 12k out of this one. Looks like were going to need another. Got a good one laying around?

There are 2 different types of transmission setups Depending on what engine you have. The torque converter ratio and front pump vary between the 8.3 and NHC250. which engine do you have?

 

[Miswesttowman]

There are 2 different types of transmission setups Depending on what engine you have. The torque converter ratio and front pump vary between the 8.3 and NHC250. which engine do you have?

Cummings

 

[simp5782]

Cummings

They are both cummins engines. One is a 505ci 8.3L 6cta turbocharged engine. The other is a 855ci NHC250 Naturally aspirated engine. Easier to post a picture of your engine for me to tell you which one.

 

[Miswesttowman]

They are both cummins engines. One is a 505ci 8.3L 6cta turbocharged engine. The other is a 855ci NHC250 Naturally aspirated engine. Easier to post a picture of your engine for me to tell you which one.

Sorry...Non Turbo