Start vehicle up in park, let vehicle run for 15 mins. I had even asked transmission shops about it to which I only received vague “Oh, that might take some time to fix, bring it in so we can look at it” answers. My transmission in Ol’ Blue leaked like the Exxon Valdez for 3 years before I finally ran across the information online on how to replace the shift shaft seal myself. I noticed a leak from the Allison trans after I pulled my 7000 lb trailer up a long grade on a 90 degree day. This truck belongs to my neighbor , the problem started out of the blue, no mods, no working on it in any way, it is an old Ford truck maybe 1979. 2-3 shift is very late and may not happen at all until i let off the throttle. (fluid will be hot)Remove one bolt at a time and wrap with teflon tape , torque to factory spec's. ( 400,350,700,200 TH's ) Allison has a tool set so that the seal can be replaced from the outside. Any of the seals could be leaking this fluid, including the shifter housing seal, plug seal, tail housing seal, output shaft seal, and so on. Allison Transmission Fluid Leak By Blog Post on March 1, 2010 11:00 PM| No Comments During cold weather, a small, red fluid leak may be noticed on some 2001-2010 Silverado and Sierra 2500HD-3500HD series models equipped with the Allison LCT1000 transmission (RPO M74, MW7). Shut vehicle off, if on a lift, check area of the transmission leak if it is bolts mark each one with a marking pen. Technician has found pins are loose! The most common reason a manual transmission would jump out of gear is due to low or contaminated fluid, worn synchronizers inside the transmission, or improperly adjusted shift linkage. Shift selector does not display any power on the selector display. 1) Limp Mode (Allison 1000 Model) The Allison transmission 1000 model has a feature called “limp mode”, in which the transmission locks itself into third gear. I lost about a quarter of a quart of fluid. Replaced new pins and plugged the connector. Read also: 4 Symptoms of a Bad Flywheel and Replacement Cost. The trans gauge went up to about 190 degrees. 7. check shift linkage adjustment. The seals will then leak transmission fluid. The 429 gasoline engine will connect to the transmission modulator circuit via either a mechanical modulator that is a linkage connected to the throttle, or a vacuum modulator that will be mounted on the transmission and be connected to a vacuum line that runs to the engine intake somewhere. make sure shift lever at transmission goes to full detent in each selected range. Allison Transmission could not possibly know, evaluate, and advise the service trade of all conceivable ways in ... • Shift linkage freely positioned by transmission detent • Full (and ease of) movement of mechanical modulator linkage • Leaks in the vacuum or air … TH400 and TH350 GM Automatic transmissions are notorious for leaking. It takes some practice and usualy requires about 5 ruined seals before you get one to seal. The Allison linkage seal is the same one used on all GM's. Place vehicle over kraft paper in the transmission area. It looks like the fluid is coming from an area on the trans where the shift linkage … Also I suggest that the transmission mount is checked for excessive wear because bad mounts have been verified as a fix to similar concerns. The fluid leak may be at the back of the transmission by the vent. ... had a few mid 80s J8 GMCs with 3208NA and 653 Allisons that had 1-2 shift points around 27-2800 rpm and was advised by Allison that this was the normal shift point for that arrangement. Transmission Leak Repair Cost. This mode is triggered by anything that could cause severe damage to the transmission, including severe overheating or towing a … I have the tools and use them often. 3-4 shift seems normal, 4-5 shift never happens no …
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