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I think most of the tranmission issues are from vibrations, heat exchanger failures, wiring problems, running max governed speed, and low use. One member here says “that no use is abuse.” I think the gear-train module which is about same as the 3060 is prob the most reliable part of the...

Took the clutch housing apart, all I could really find was oxidation, there were numerous rust spots throughout the main shaft and clutch housing, the only thing I can think of is there was corrosion that broke free and caused some abrasive wear in the clutch housing.

Thanks for everyone’s input, it has been hard to find a culprit, I need to take the clutch housing off to see if there is any wear there. When I took apart the PTO the same contaminates I found in the filter were in the housing. Brass shavings, ferrous flakes, and brass particles suspended in...

Took apart my PTO today found some wear on the clutch housing input gear, also found some endplay on the clutch housing. I cannot find a spec for endplay or if that is normal.

Took my PTO back off to check for metal. The PTO seems fine, spins well, slight endplay on the input gear, dumped the oil from the PTO housing into a clean bin and it looks like the same material I found in the lube and scavenge filter. The PTO I took from a parts truck that had about 10k miles...

I was able to remove mine as well, when installed the half moon plugs there was some wiggle on them, I wonder if the drum dimensions are not very consistent. If I have trouble in the future I will use you tip and keep my finger file handy. I was concerned with those half moon plugs getting...

No the module in the valve body for level check is not there. I just ran it hard up hills, the shifts adapted pretty quickly, the only one it seems to have trouble with is a kickdown to a lower gear when climbing a hill.

Pulled the screen, found some steel qurily qs and some non ferrous metal but no roller bearings and no brass pieces, drained about 2 gallons from the transfer case, drain plug just had normal fuzz. I recently installed a PTO and I think that might be the cause, I plan on pulling it and...

With an approved tes-295 fluid, it is 36 months for filter, and 48 month for fluid. Non approved is 12 months for fluid and filter. Please ref Allison service letter 10-tr-99

My truck is not in the SN range for the first bearing update, so it has the updated thrust bearing but not in the final update where the composite thrust washer was used. see attached Allison service letters regarding c6 bearing updates As far as know there were 3 bearing used. The original...

I recently accomplished my transmission filter change, when I pulled it, I cut open the filters to see if there was metal and I found a bit, most metal was ferrous flakes smaller less than .002, some brass shaving about .0025x.125” and longer ferrous shaving about .0020x.25”. This was the filter...

Adept Ape has a good video about EGT regarding CAT engines, it sound like his advice was to have a pre turbo pryometer with a max temp of 1400 degrees. It sounds like CAT did not have a hard spec for EGT my guess is that with all factors remain equal with a correct tuned engine the ECM should be...

I think the 370 HP rating would only be an issue if you got a warrantied transmission from MTP or from Allison. Otherwise it should not be an issue, I would imagine a C6 thrust bearing, heat exchanger leak or thrown driveshaft would destroy your transmission long before a 370hp tune would do any...

Allison has a doc showing the gross input hp is 330 hp for the 3700sp, I don’t really know if that means is that is the most HP that the transmission can deliver or if it is the most HP it can receive. I know there has been people who have done the 370 tune without problems. Even if that is the...

I just did a winch SRW install on my truck, the PTO was the hardest part, it is very hard to access the bolts without the bed removed, I used a 10mm 12point torque adapter extension to get to the PTO bolts, also you need to get the PTO install kit that has the right bolts and studs. after I...

They don’t serve a purpose with the eco hubs. I left mine in place I figured if I had a catastophic hub failure I could put the reduction hubs back on and I would have more shims to work with when doing the lash.

Call me colt has a good video of the install, when I put mine in I had trouble with the braided steel line, I have the arctic heater kit so the unit is in front of it and it was hard to access.

Quarts bottles are not so bad, easy to carry up and fill the spout. At least it is not like the old days where you had to bring a dull can opener and pop open every can. I had to fill a 10 gallon hydraulic tank with skydrol 1 quart steel cans via a hand pump. when I filled my transmission from...

the spots I can think of where oil and coolant can mix is the engine oil cooler, head gasket, transmission heat exchanger… maybe air compressor. Past reports of mixing was usually from the transmission heat exchanger but it was usually coolant in the transmission.

5w-40 is a good range, looks like from -30 to 122F, cat has a good chart for the temps to run. I end up running 15w-40 in my 3126. I wonder if the HUEI system puts more stain on the oil pump? My oil pressure seems to be around 20-30 at temp at idle, and about 60-70 in cruise. I have the 6pz just...