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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #1  
Old 06-16-2018
1984Lodge's Avatar
1984Lodge 1984Lodge is offline
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Default Transmission Transfusion

So I had noticed climbing trans temps on my last couple of trips, so I decided to do a full trans service. I am glad that I did, my trans fluid looked more like the engine oil. It was barely red at all, and there was a bit of sludge on the bottom of the pan. Got it all cleaned up, replaced external filter and internal filter then filled it up with just under 5 gallons of Allison Transynd fluid.

Part #s are as follows:
External Filter Wix #51268
Internal Filter Allison #29538489
Filter Tube Allison #6883046
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Jeff LoGiudice
1984LodgeJeff@gmail.com
Temple Terrace, Florida
1984 Bluebird PT40
#F063411 6V92TA & MT654CR
& 1986 MCI 102A3
6V92TA & HT740

http://www.bbirdmaps.com/index.cfm #460
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Old 06-17-2018
photoadjuster photoadjuster is offline
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If it had Transynd in it before it would have been brown, not red.
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  #3  
Old 06-17-2018
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I know there's magic bullet feelings out there regarding syn oils, however most vintage Allison applications, straying from Dextron or dino oil is generally a waste of money and can result in leaks that weren't there prior to the 'upgrade'.
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  #4  
Old 06-17-2018
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Quote:
Originally Posted by Mike Hohnstein View Post
I know there's magic bullet feelings out there regarding syn oils, however most vintage Allison applications, straying from Dextron or dino oil is generally a waste of money and can result in leaks that weren't there prior to the 'upgrade'.
And most Allison shops prefer you run motor oil in the older allisons.
10w-30 i think..
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  #5  
Old 06-17-2018
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I would agree.
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  #6  
Old 06-17-2018
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Quote:
Originally Posted by Randy Dupree View Post
And most Allison shops prefer you run motor oil in the older allisons.
10w-30 i think..
Shane and Dr. Heckman and now I run Rotella 15-40. That's what Precision Transmission (Shane and John's rebuilder) recommends. More frequent changes are recommended, but it's way cheaper. We swapped mine out at Mikes from Transynd to Rotella after it started leaking. (drained, filled with 15-40, ran then drained again and refilled with fresh 15-40) It feels good, drove 250 miles yesterday. Unlikely it will stop the leak, but it is a little heavier so may slow it down
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Old 06-17-2018
bubblerboy64 bubblerboy64 is offline
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How long does it take to get 5 gallons into the transmission. I'm due for a change. How does one accomplish this mission. Only fill point is the tube which the dip stick goes down am I correct. Seems like a funnel would be a very slow go. Pump it in some how?
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Old 06-17-2018
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Quote:
Originally Posted by bubblerboy64 View Post
How long does it take to get 5 gallons into the transmission. I'm due for a change. How does one accomplish this mission. Only fill point is the tube which the dip stick goes down am I correct. Seems like a funnel would be a very slow go. Pump it in some how?
Mike used a pump like you would use for a differential. They fit a hose over the dipstick tube and connected it to the pump on a 5 gallon can of Rotella 15-40.

Like this
https://www.walmart.com/ip/Westward-...9248ea10bca376
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Old 06-17-2018
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1984Lodge 1984Lodge is offline
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Quote:
Originally Posted by photoadjuster View Post
If it had Transynd in it before it would have been brown, not red.
The transynd I put in was red.

Quote:
Originally Posted by Mike Hohnstein View Post
I know there's magic bullet feelings out there regarding syn oils, however most vintage Allison applications, straying from Dextron or dino oil is generally a waste of money and can result in leaks that weren't there prior to the 'upgrade'.
I did not have to purchase this fluid, so for me cost analysis is not a problem. Not looking for a magic bullet, this is what my supplier recommended whom just put this fluid in his PT40. It's good to know a parts supplier. If it uncovers leaks, it just means I will need to address them. Leaks equal dirt infiltration. I tend to agree with running fluid that matches the vintage. Allison recommends this fluid for these transmissions, of course they get to sell expensive fluid. From my research, I believe the synthetics give you some protection from the vehicle sitting, which for me unfortunately is a fact of life until I can retire (not soon).

Quote:
Originally Posted by bubblerboy64 View Post
How long does it take to get 5 gallons into the transmission. I'm due for a change. How does one accomplish this mission. Only fill point is the tube which the dip stick goes down am I correct. Seems like a funnel would be a very slow go. Pump it in some how?
I was going to pump the fluid in, but unfortunately northern tool sold out of the oil pump. I had to use a narrow funnel and patience. Also had to transfer to 1 gal bottle since my fluid came in 5 gal pails. Get a 12v oil extractor pump to save your back.
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Jeff LoGiudice
1984LodgeJeff@gmail.com
Temple Terrace, Florida
1984 Bluebird PT40
#F063411 6V92TA & MT654CR
& 1986 MCI 102A3
6V92TA & HT740

http://www.bbirdmaps.com/index.cfm #460

Last edited by 1984Lodge; 06-17-2018 at 10:40 AM.
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