check transmission light

[Pete Masterson]

I've been running Transynd since I got my coach -- previous owner was using it as well. There has been no issues whatsoever with the transmission.

You may need to visit an Allison dealer and have them read the 'codes' to get some idea of what's going on. I suppose that the synthetic may have loosened some left over gunk from the old dino-fluid that has subsequently clogged or blocked something inside.

To quote from the Transynd brochure: [Natural oils] undergo physical and chemical changes with extended use. Physical changes include sheardown -- permanent viscosity loss.

Chemical change results fromoxidation when oxygen combines with oil molecules to produce peroxides and organic acids. The oil thickens over and becomes more acidic. Sludge and varnish deposits erode shift quality and clutch durability and cause increased component wear.

I believe that it is recommended that the transmission be "flushed" to remove the dino-oil before converting to a synthetic.

Pete Masterson

'95 Blue Bird Wanderlodge WBDA 42

El Sobrante CA

"aeonix1@mac.com"

Photos:

http://picasaweb.google.com/Bluebirdzoom/PeteMasterson#

On May 20, 2009, at 6:43 AM, maureyroad wrote:

Yesterday the shop drained the transmission fluid, put on a new filter and refilled with synthetic. Now the check transmission light comes on while I am driving, goes off at idle, and it won't shift into fourth gear. Any ideas?
Dan Williams, 88wb38,Jackson,MS