Let Me Know if You Have Allison Transmission Fluid Questions

How can you tell if you have Dexron or Transyd? Did Allison stop using Dexron in a certain year?

Guy kept filling his trans It would have mighty overfilled if it was a ps or leveller leak plus AW32 is clear oil not redish like trans oil

Jim@HiTek wrote:

ChaosAgent wrote:

Jim@HiTek wrote:
Thanks for your advice and help here on the forum, hzjcm8.

I had my Allison 4 speed back flushed and filled with Transyd at 136,000 miles back in '07 at a bus repair shop that was just getting into RV's. They used a big fancy machine and told me they flushed it until the fluid was the right color, 3-4 times if I remember. At that time they told me there was no need to replace the tranni filters as the back flush would clean them like new.

Is that true?

At 142K miles, I developed a hydraulic leak in the boondocks of Canada. I had a couple quarts of Transyd that I used up along with a couple pints of ATF stop leak I bought as I limped several hundred miles to Prince George. Also added regular ATF as needed along the way (small stores don't usually carry transyd).

Had a leaking hose replaced and the tranni topped off with more transyd. The mechanic told me it was OK to mix the standard ATF, Stop Leak, and the Transyd but I would like to hear that from you.

Should I have it re-flushed, or is it OK with those other fluids in there?

Thanks!

Just a question. Was this a 'hydraulic' leak or a transmission leak. In most cases, there's a difference.

Hmm. I'm not a mechanic but it was tranni fluid leaking from a hose near the back & under the engine (but not FROM the engine). Three or four feet from the tranni. I think the hose was attached to the rad cooler. I let the mechanic take care of it and he had a devil of a time getting the bad hose out of there because of frozen connections. The only fluid I was loosing on the trip was tranni fluid...which I kept topping off.

It was at the beginning a slow drip I could see under the rear of the RV, just a small 2-3" diameter puddle after each time we stopped (every 4 hours or so).

Sorry. The reason I was asking is that my rig has 3 different hydraulic systems besides the transmission, two of them back in the engine area.

I have the hydraulic system for the power steering and ISC 350's radiator fan. It uses AW32 clear hydraulic fluid.

I also have the hydraulic resevoir for the PowerGear levelers. It uses ATF.

And up in front I have the resevoir for the hydraulic system that extends and retracts the Onan Generator.

Had a friend that saw leaking hydraulic fluid and was almost sold a tranny rebuild before he figured out it was his levelers.

That is what the label on the pail says, and that is what is advertised. Sometimes you just have to have a little faith. I have never had a problem with ebay, but there is always a first time. Good luck.

wineberrywinger wrote:
If anyone is interested in some TranSynd, I just bought a 5 gal. pail for $160, delivered, on ebay. The asking price was $179 or make an offer. He had 10 five gallon pails.

How do you know it's TranSynd in the bucket? I'm real leary of Eby stuff.

If anyone is interested in some TranSynd, I just bought a 5 gal. pail for $160, delivered, on ebay. The asking price was $179 or make an offer. He had 10 five gallon pails.

ChaosAgent wrote:

Jim@HiTek wrote:
Thanks for your advice and help here on the forum, hzjcm8.

I had my Allison 4 speed back flushed and filled with Transyd at 136,000 miles back in '07 at a bus repair shop that was just getting into RV's. They used a big fancy machine and told me they flushed it until the fluid was the right color, 3-4 times if I remember. At that time they told me there was no need to replace the tranni filters as the back flush would clean them like new.

Is that true?

At 142K miles, I developed a hydraulic leak in the boondocks of Canada. I had a couple quarts of Transyd that I used up along with a couple pints of ATF stop leak I bought as I limped several hundred miles to Prince George. Also added regular ATF as needed along the way (small stores don't usually carry transyd).

Had a leaking hose replaced and the tranni topped off with more transyd. The mechanic told me it was OK to mix the standard ATF, Stop Leak, and the Transyd but I would like to hear that from you.

Should I have it re-flushed, or is it OK with those other fluids in there?

Thanks!

Just a question. Was this a 'hydraulic' leak or a transmission leak. In most cases, there's a difference.

Hmm. I'm not a mechanic but it was tranni fluid leaking from a hose near the back & under the engine (but not FROM the engine). Three or four feet from the tranni. I think the hose was attached to the rad cooler. I let the mechanic take care of it and he had a devil of a time getting the bad hose out of there because of frozen connections. The only fluid I was loosing on the trip was tranni fluid...which I kept topping off.

It was at the beginning a slow drip I could see under the rear of the RV, just a small 2-3" diameter puddle after each time we stopped (every 4 hours or so).

Jim@HiTek wrote:
Thanks for your advice and help here on the forum, hzjcm8.

I had my Allison 4 speed back flushed and filled with Transyd at 136,000 miles back in '07 at a bus repair shop that was just getting into RV's. They used a big fancy machine and told me they flushed it until the fluid was the right color, 3-4 times if I remember. At that time they told me there was no need to replace the tranni filters as the back flush would clean them like new.

Is that true?

At 142K miles, I developed a hydraulic leak in the boondocks of Canada. I had a couple quarts of Transyd that I used up along with a couple pints of ATF stop leak I bought as I limped several hundred miles to Prince George. Also added regular ATF as needed along the way (small stores don't usually carry transyd).

Had a leaking hose replaced and the tranni topped off with more transyd. The mechanic told me it was OK to mix the standard ATF, Stop Leak, and the Transyd but I would like to hear that from you.

Should I have it re-flushed, or is it OK with those other fluids in there?

Thanks!

Just a question. Was this a 'hydraulic' leak or a transmission leak. In most cases, there's a difference.

Thanks for your advice and help here on the forum, hzjcm8.

I had my Allison 4 speed back flushed and filled with Transyd at 136,000 miles back in '07 at a bus repair shop that was just getting into RV's. They used a big fancy machine and told me they flushed it until the fluid was the right color, 3-4 times if I remember. At that time they told me there was no need to replace the tranni filters as the back flush would clean them like new.

Is that true?

At 142K miles, I developed a hydraulic leak in the boondocks of Canada. I had a couple quarts of Transyd that I used up along with a couple pints of ATF stop leak I bought as I limped several hundred miles to Prince George. Also added regular ATF as needed along the way (small stores don't usually carry transyd).

Had a leaking hose replaced and the tranni topped off with more transyd. The mechanic told me it was OK to mix the standard ATF, Stop Leak, and the Transyd but I would like to hear that from you.

Should I have it re-flushed, or is it OK with those other fluids in there?

Thanks!

Tom,
Is it important to distinguish between a transmission fluid brand being Allison Approved TES 295 Lubricant and a brand listed as meeting Allison transmission TES 295, TES 398, C-4 and C-3 specification requirements? The latter brand will be much easier to obtain locally and somewhat cheaper.

Wagonmaster2