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Allison Transmission service
I have recently hit the 50k mark on my 2500HD Duramax with the allison transmission. I went to the Allison web site to view maintenance tips etc. According to my owners manual at 50k I need to change the fluid and the spin on filter. The Allison web site says the interior filter only needs to be changed at overhaul but the spin on should be done at 7500 miles the first time as per a new service post. Arrgh ! I called several dealerships to ask them what they charge and do for the tranny service. All the GMC dealers I called charge about $200 to drop the pan and change the interior filter, replace the spin on filter and top off the fluid. No flushing the lines or cooler. I thought that was a little silly as Allison says dont change the interior filter. I called a couple of Kenworth/allison dealers and they charge $75 per hour for labor, neither CSR of the two places I called new what they did for the service. I figured if I was going to pay the price tag I would have the system totally flushed and re-filled with Trans Synd Synthetic (allison's brand). In short the total looked to be over $300 with the synthetic fluid at about $25 per gallon. So I figured to heck with that I'm going to replace the spin on filter and just drain the pan myself. The dealer was at $36 for a spin on filter but NAPA auto parts has them for $18.00. Regular Quaker state tranny fluid was $6.00 per gallon Vs $6-8 per quart for synthetic. The spin off filter was full of fine metal shaveings which I expected. I only was able to drain 8 qts out of 22. So for $30 Vs $300 my current plan is to change 8 qts and the spin on filter every 10k from now on. Has anyone here changed the interior filter on the Allison themselves ? I assume this is a very fine filter. I would change it myself if I can just because but not at $200. Any thoughts ?
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Allison Transmission service
F-350. Thanx for the tip. I had seen others discuss this method on web sites for those that haul travel trailers. I did not really understand what they meant though. Did you use synthetic ? I also checked the rear end, It was a 1/2 quart low so I topped it off. I would like to remove the cover and completely drain it and refill. I noticed when I had this done on my Bronco that the dealership seemed to use the same gasket with some type of form a gasket. Any ideas on what type ? I know some guys are useing the aluminum rear end covers with drain plugs that add 3 more quarts to the capacity but they are about $250 for the cover.
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Allison Transmission service
Allison is makeing a deep trans pan but I dont want to go that route due to my skid plates. Mag hytech is the one makeing the finned rear end aluminum covers at $250 ish but the same holds true as I get pretty deep in the woods. Aluminum can crack when whacked and the oem steel just bends or gets dented. Chief I will deinately be looking at ginos for one of those pump bottles. The electronic transfer case was a royal pia to refill. The top plug is right against the body. I used a emptyed out 90 weight gear oil bottle to squirt it in but it was a little messy. F-350, did you use a new gasket on the rear end as well as the form a gasket ? The front differential was easy to change but the fluid there was low. When I drained the oil the plug had a kind of pin on it. I looked in the drain hole and the bottom interor of the case was thick and goopy. I'll be changeing theese fluids every 25k from now on. Its definately cheap insurance.
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Allison Transmission service
I do have a limited slip axle but I dont see anywhere in the book that it calls for any additive or graphite. It does specify Synthetic though.
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Allison Transmission service
All the Fords I have had indicted adding 4 oz of graphite. I think the Dodge does as well but its so new yet I haven't double checked. No mention of it in my owners manual. If I remember right the LS in the Duramax is actually made from a graphite plate or something different than the historical standard. I have been very happy with the mobil 1 synthetics so I will be useing their gear lube. I did top off with a Valvoline synthetic but I intend to drain that out. I would use Delvac 1 if I could find it at a reasonable price but wally world here finally has the Rotella synthetic at 12.88 a gallon.
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