Allison Transynd

[Oclk Dlux]

Has anyone tried putting the Allison Transynd in their auto trans? After researching different synthetic ATFs, I deciced on the Transynd and recently drain & filled my LeBaron's A413 with the stuff. Now it heats up more than I like. When cruising to work, the trans would get to 120F and maybe 140F on the freeway. Now it shoots up to 160F and climbs more while going only 65! I know that it's still in the "safe" temp zone, but I was planning a long trip soon and was hoping to enjoy the added benefits of a synthetic ATF, not have it overheat.

I used Transynd on my Duramax's Allison and had no problems. Did I mess up by putting it in a trans that wasn't really designed for it?

Thanks.

[gmonde]

the allison transynd is designed for allison transmissions and by using the transynd in there trans missions will able you to purchase extended warrantys it must be good to offer that,i had a caravan that i used regular dextron in and i swore i blew the thing up, real hard shifting ,shifting late,banging converter,changed back to the correct chrysler trans fluid,trans went back to normal operation,we usr the transsynd in all of our over the road coaches and the transmissions last 500,000-600,000 miles they wouldnt make it 250,000 other wise
now your car transmissions operating range should be about the same as the engine,you mite want to go back to the chrysler stuff,i know i had to,that trans lasted 173,000 miles before i had to go thru it
gmonde

[Oclk Dlux]

Thanks for the reply. A friend of mine who does plenty of transmission work agrees with you that transmission usually rises to the same temperature as the engine as both are connected together. As long as the transmission matches engine temperature, there's no problem. Yesterday I rodded the car plenty on the way home just to see what the temperature climbs to. It went no higher than the engine's temp (190F) and when I let off, both the trans & engine temps drop together to 165F. Very interesting!

I bought the TranSynd because it's compatible with Dexron III. I'm used to the slow temp rise of Dexron III and I guess I freaked out watching the trans temp rise faster than expected with TranSynd. But maybe that's a good thing. I read that TranSynd has the same friction dynamic coefficient as ATF+3, but it's "dual viscosity", meaning it retains the same viscosity at hot & cold temperatures. The new ATF+4 from Mopar and Valvoline is the same. I know of two tricks used to bring the trans temp up quickly to reduce wear. One is to use a radiator trans cooler and the other is a cooler bypass valve in the valve body (Dodge Neon A413s have this feature). Maybe TranSynd & ATF+4 resolved this problem with their dual viscosity properties so neither the radiator cooler or cooler bypass are needed? If so, then that will make things a lot easier :^)

I'll leave the TranSynd in and watch what happens. Wish me luck!

[art leong]

Hi Rich I wonder if the synthetic fuild is taking more heat out of the trans? As in cooling more effectively?
Way back when they first came out with synthetic oils. We were talking with Tom Hoover from Chrysler about them and he had told us in the preliminary stages of testing. They found the oil temps up 10 to 15 degrees. At the time they weren't sure if it was because the oil was transferring heat better, or creating heat because it wasn't doing its job.
Good luck ( I just put $8 a quart stuff in mine)

[Oclk Dlux]

Hey Art,

Concerning whether the synthetic absorbs more heat or not, I wondered that myself. However, I know that Mopar now recommends ATF+4 synthetic for all autos, regardless of year. I think the answer may have just revealed itself.

So far so good, no leaks or complaints from my transaxle. I glued the pans on with the latest Mopar Engine & Gear Sealant (P/N 82300234). It's gray in color and tough as nails. Even synthetic oil can't weep through :^) But trying to take the pan off afterwards is a royal pain!

[Oclk Dlux]

By the way, TranSynd is $8.75 a quart. Whew! Sounds like you got a deal with yours at only $8 a quart, haha.

[art leong]

Rich the main problems I had with the 413 type trannys were kicking the differential pin. And getting the converters not to break.The torque builds up so quick on the turbo cars it destroys the hard parts in the converters.

[Oclk Dlux]

Art, Gary Peloquin (www.peloquins.com) now has a torsion style LSD that fits the A413 without needing the ring gear spacer the OBX or Quaife requires. It's a spendy one grand, but it has top quality German bearings and such. Several have used it and reported no problems. Unfortunately, I've been cash strapped for the last year, so I've not bought one yet.

Mark, I'll look into the high tack gasket sealer you've desribed. Anything is better than taking a jack hammer to a pan because the RTV is too good, haha. Thanks.

[Oclk Dlux]

Final Update:

After driving with the Allison Transynd in my A413 for several months, I have definite proof it's not compatible. Here's the data in the order of modification. I apologize for not having any quarter mile results, but I figured the MPG would be a good indicator:

Overall gear ratio: 3.22
Fluid: Dexron III
MPG: 25
Trans temp on freeway: 130

Overall gear ratio: 3.02
Fluid: Transynd
MPG: 18
Trans temp on freeway: 190

Overall gear ratio: 2.6
Fluid: Transynd
MPG: 22
Trans temp on freeway: 190

Overall gear ratio: 3.02
Fluid: Dexron III
MPG: 25
Trans temp on freeway: 140

Note how the temperature is still slightly higher after I flushed out the Transynd and put Dexron III back in. There must be a small amount remaining. I'll flush it again for good measure.

I don't have exact knowledge as to what caused this drop in MPG (performance too!) and increased heat, but I feel the torque converter was the culprit as it may have been incompatible with the Transynd. Maybe Transynd requires a different TC design?

Well, this was a failed experiment, but what's life without adventure? A good friend of mine who raced NHRA Comp Eliminator said that in experiments like this, 90% is research & development. Only 10% of the parts, fluids, & procedures tested are actually used to race.

I hope everyone can get some useful information from this.

[art leong]

Hi Rich just wanted to let you know Tim Kish has some that makes spools for the 413 trans, its a bolt in no spacers etc.