Transmission Fluid Leaking Problems of GMC Sierra 2500

Gm states that dexron-vi is fully backwards compatible with all dexron-iii applications. My vehicle is a 2005 GMC sierra k2500hd, with an 8. 1l gasoline engine and allison 1000 transmission. After performing a routine service on my transmission (fluid drain and refill), replacing the dexron-iii with dexron-vi, I noticed the seals and gaskets leaking from around the transmission. Upon further research, I found that the synthetic dexron-vi is not compatible with certain seals installed in allison brand transmissions. Allison transmission does not approve the use of dexron-vi in its transmissions due to the seal incompatibility (allison service tip #1099p). Another allison document (sa5429en) lists two serial number cutoffs, prior to which contain seals incompatible with dexron-vi. The situation has yet to be resolved - gm denies any possible incompatibility, and will not warrant any damages, while allison representatives have told me that the problem is a direct result of dexron-vi. The estimated cost to replace all of the seals in the transmission is $1,900. 00.

See all problems of the 2005 GMC Sierra 2500 🔎.

Went out to the truck to go to work and the truck wouldn't move. Transmission line leaking out all fluid. Corroded and had to be replace just like the brake lines.

See all problems of the 2002 GMC Sierra 2500 🔎.

I have a 2006 GMC Sierra 2500 with the lbz duramax and allison transmission. Two of the transmission coolant lines began leaking transmission fluid at the crimp ends in March of 2009. The truck only had 32,000 miles, but was 3 months beyond the 36 month warranty period. Service under warranty was denied. An on-line search reveals several others have complained about this issue and that the dealer installed oem replacement lines are no better (developing leaks soon after replacement), yet no TSB or corrective action has been issued by gm. Leaking transmission fluid is a fire and environmental hazard. The leaks are getting worse.

See all problems of the 2006 GMC Sierra 2500 🔎.

I own a 2006 GMC 2500hd duramax/allison crew cab. I took ownership in Feb of 2007 with 32k miles. Transmission lines were leaking at that time. Dealer replaced the lines under warranty. Now at 100k miles and same "new" lines are leaking once again. This is a flammable fluid and constitutes a potential fire hazard.