Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 12, 2025 ...

Transmission Fluid Level

November 12, 2020, 02:26:26 pm

So I checked the transmission fluid and it was barely on the dip stick. The manual said it holds 18 quarts (Allison). I put 4 in and now the district shows its over the fill line. Is that going to be an issue and if so is there a way to drain some out?

Quote Selected

Re: Transmission Fluid Level

Reply #1 – November 12, 2020, 02:29:47 pm

Yes, too high is as bad as too low.

Two methods:  with a shop vac sucking on the transmission fill tube (duct tape "adapter"), remove the drain plug long enough to drain what you need to. QUICK is the operative here, but the suction from the vac will slow down the drain rate.

The other method is with a small pump (like one would use to take oil samples) through the dip stick tube.

Quote Selected

Re: Transmission Fluid Level

Reply #2 – November 12, 2020, 02:57:31 pm

I had my transmission to high and it was not happy and I drained it as Wolfe said with a small hand pump down the dipstick tube.

Quote Selected

Re: Transmission Fluid Level

Reply #3 – November 12, 2020, 04:19:16 pm

Are the U-series the same as the GV as far as fill tube length? I have a Detrot 6V92 pusher

Quote Selected

Re: Transmission Fluid Level

Reply #4 – November 12, 2020, 09:31:14 pm

I have a 6 1/4 gallon oil extractor that was purchased for special occasions such as this.
Harbor Freight model, many others available.

Quite a handy tool.

Quote Selected