Getrag 360 5 speed transmission OT

marcusoverholtzer · Mar 11, 2017

Hello all does anyone know anything about these transmission? I went to look at a 1993 w250 Dodge Cummins 12 valve and test drove it. while the transmission was cool it shifted fine all the way to 5th gear, after going all the way up to 5th it would downshift into 3rd or 4th gear at all. We pushed hard on it but would not go. It would go into 1st 2nd and 5th though. ALso after the trans had warmed up it still would not go into those gears. I'm considering buying the truck anyway and fixing the trans. Does anyone know what it could be? Syncronizers?? Please help!! Thanks

Janicholson · Mar 11, 2017

Manual transmissions are interesting to fix, but require precision and detail. The bearings and shafts can be tough to get installed while keeping things in place. Find out the price of synchronizers and rebuild kits before purchasing it. Nothing is as simple as it seems. Jim

Bob · Mar 11, 2017

It MAY be a roll pin (in the shift rail) or shift fork issue.

rustred · Mar 11, 2017

so true, and many times the savings are in buying dependable, not mechanic's specials.

JDEM · Mar 11, 2017

My Getrag has 300K miles on it in my 1992 Dodge-Cummins. Never had any problems but I always run it one quart overfull as many trans rebuilders recommend. I broke the locating pin in the shifter once and that is the only problem. I know parts for these transmissions though are high. I am surprised the 1993 still has it. Somewhere around that time Dodge switched to the NV4500 and had several problems with it.

casecollectorsc · Mar 11, 2017

Had one in a 92 Dodge Cummins. At something over 300000 at 70 mph a bearing failed and threw a shaft out the side of the case. Not a rebuildable core so it cost $2250 to repair.....about 6 years ago.

Oregon Tractor Jack · Mar 11, 2017

I bought a 91 that was acting similar to what you are describing. We ended up replacing all of syncros and all of shifting forks. I think we had to replace one gear set also. I did the over fill when I put it back in the truck. All has been well since then (fifteen plus years. My neighbor that has been a diesel mechanic all his life do it for me. I would not attempt a transmission that complicated. I would find a transmission shop and get a ball park on a rebuild.

OTJ

jimg.allentown · Mar 11, 2017

The problem sounds like cracked blocker rings in the synchronizers.
These are generally brass cones that act as a friction element to force the gears to synchronize their speeds to allow them to engage.
Replacement involves disassembly of the transmission and replacement of the failed parts. Many times, this will require some special tools such as dummy shafts for loading needle bearings, gear pullers and collars for pressing things on the main shaft apart and together. All in all, not a good project for the average home shop.

T in NE · Mar 11, 2017

They switched to the nv4500 in 94.

Get a 94-up flywheel housing and starter, and you can swap in a nv4500, nv560p, or g56.

Or, find a wrecked Ford medium duty (f650, 750) with a 5.9 and zf6, and you will have the parts to go that route as well.

The 3rd gear synchronizers are a known issue on the gutbag 360 due to the wide ratio split from 2 to 3.

ss55 · Mar 11, 2017

Most likely you have just discovered why the truck is for sale: it could cost more to fix the transmission than the 24 year old truck will be worth after its fixed. If it was an easy fix the seller would have already fixed it and priced it higher. The seller is trying to get more than salvage value by selling the truck privately.

It sounds like you should budget in the extra cost to install a remanufactured transmission and while it's apart have the clutch rebuilt, throw out bearing replaced and engine rear main seal replaced. Hopefully old parts are can still be traded-in as useable cores, if not add on the core charges. Look up the "private sale" value of the truck and deduct the cost of the repairs to get a maximum price for the truck "as-is". This one could be a money pit even if it was free.

Getrag 360 5 speed transmission OT

marcusoverholtzer

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Janicholson

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Bob

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rustred

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JDEM

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casecollectorsc

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Oregon Tractor Jack

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jimg.allentown

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T in NE

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ss55

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