Leaking transmission fluid is a fire and environmental hazard. I noticed a fifty cent size drip on my garage floor. If that isn't it then maybe oil cooler line. Also are you certain its engine oil and not possibly power steering fluid? The truck only had 32,000 miles, but was 3 months beyond the 36 month warranty period. Upon further research, I found that the synthetic dexron-vi is not compatible with certain seals installed in allison brand transmissions. Gm stated that I had to take it to a dealer for inspection. Allison transmission does not approve the use of dexron-vi in its transmissions due to the seal incompatibility allison service tip 1099p.
I'm with you, not likely the leak would travel forward. It starts as the bottom of the bell housing is damp, then you'll get a drop or two here or there, then it gets progressively worse. Drove vehicle 8 more miles and traded with me, when I got to the vehicle, I found brake fluid leaking onto ground, found lines corroded beyond belief on driver side frame around wheel well. As the transmission warms up, the expansion of the air inside the transmission can force the trapped fluid out of the vent, leading to small drops of fluid being discharged. It has most likely also leaked into the radiator. Check your dipstick, see if it popped out of the grommet. I have never seen brake lines rust out like this.
Transmission lines were leaking at that time. My 2 cents I got the truck back and they claim it was the front protion of the pan gasket which is why the front of the transmission was wet. Once the truck cooled down, it didn't drip anymore and we're talking just a few droplets total, not puddles. The tranny fluid looked fine, and smelled fine, too. Drove truck home using emergency brake, low speed, and down shifting. I cleaned off the pan today, and after driving it hard for a while, no drips temps stayed below hot, since the trailer is off. That said, it could also be a leak from your torque converter.
Going to Sturgis in August pulling a 7x12 inclosed trailer with two touring bikes, don't want to chance a busted trans out west. Ask your dealer where in the maintenance manual it instructs you to remove the torque converter from the transmission housing occasionally to check and replace the front pump seal. Never noticed it leaking though and it has some miles. I changed the oil and noticed oil on the sway bar and the crossmember under the pan. What do you guys think. Hoping its a easy and cheap fix.
The vehicle veered left and came to a stop after much continued braking effort. It looked like some was coming from the pan gasket, but it was also on the driveshaft for the transfer case, as if it was spraying out of the transmission somewhere. Slide the jack away and off to the side. They could have at least given me a truck. Seen that happen more than once when torquing up steep grades if it was loose to begin with. With a flashlight, check the transmission underneath the vehicle for leaks. To correct this condition, remove the stock vent assembly and run an external tube Fig.
I have a 2005 chevy 2500hd 2wd. This is a flammable fluid and constitutes a potential fire hazard. Slide the jack under the vehicle to raise it off the jack stands. I am guessing it is coming from the front of the trans and not the pan. Another allison document sa5429en lists two serial number cutoffs, prior to which contain seals incompatible with dexron-vi. It's never leaked before from the tranny.
Maybe a seal or converter? We only sell parts from trusted brands like so that you can find quality parts you can count on. Inspection under the drivers side of the frame revealed rusted through steel brake line from master cylinder and leaking brake fluid onto the street. This truck is not my daily driver. Remove the jack stands from under the vehicle and set them aside. Then I drove it a little bit and stuck a flashlight into the access hole and I could see trans fluid inside the bellhousing confirming I had to re-seal the trans. Mainly in traffic around town.
Old thread I know but I have the same thing. I have tranny fluid leaking from the rear of the tranny. Two of the transmission coolant lines began leaking transmission fluid at the crimp ends in March of 2009. It just started leaking since the last time I drove it. When I was changing the oil on Sunday I noticed the front bottom of the torque converter housing front of the transmission was damp with transmission fluid. I don't have an Allison not the Dmax but my 4L80e runs about 200-210 when in pulling my trailer And I pull it all over the place. The leaks are getting worse.