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  #101  
Old 02-03-2020
Randy Dupree's Avatar
Randy Dupree Randy Dupree is offline
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OK,i think theres a port on the side of the trans that has a switch in it for the jake brake on a Detroit powered coach,that port is from the lockup valve.
If you put a switch in that port with a light hooked to the switch at least you will know if the lockup is working,and in what gear.
Put the light in the drivers area.
Your port will be plugged i think,take the plug out and put a old ford brake light switch in it with 2 terminals.
Thia will help you figure out the lockup,and you can work from there.
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  #102  
Old 02-03-2020
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MRPutz MRPutz is offline
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Quote:
Originally Posted by Randy Dupree View Post
OK,i think theres a port on the side of the trans that has a switch in it for the jake brake on a Detroit powered coach,that port is from the lockup valve.
If you put a switch in that port with a light hooked to the switch at least you will know if the lockup is working,and in what gear.
Put the light in the drivers area.
Your port will be plugged i think,take the plug out and put a old ford brake light switch in it with 2 terminals.
Thia will help you figure out the lockup,and you can work from there.
Good idea Randy, I was reading there are two ports on the driver's side, one pump pressure and the other shift pressure. A guy had two lines made and put 300psi gauges on each to monitor them from the cab. I will definitely look into that.

Found a good Allison MT643 manual that states the lockup is in the torque converter and Is "effective" in 3rd & 4th. I feel the lockup in 3rd but only feel one shift going into 4th and wonder if I'm supposed to feel another lockup in 4th?

Torque converter
Type.........................Single-stage, 3-element, multiphase
Stall torque ratio.........TC 350-3.04; TC 360-2.86; TC 370-2.40;
TC 378-2.27; TC 380-1.82
Lockup Clutch, automatic..................Effective in 3rd & 4th
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  #103  
Old 02-03-2020
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Mike Hohnstein Mike Hohnstein is offline
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Enter the following values
Ring & pinion gear ratio

4.88
Tire height (in.)

42
Engine RPM

3000
Transmission gear ratio

1.1
ImperialMetric
Vehicle speed in MPH
69.86

Just the facts, no 4th gear, get some.
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  #104  
Old 02-03-2020
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MRPutz MRPutz is offline
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Quote:
Originally Posted by Mike Hohnstein View Post
Enter the following values
Ring & pinion gear ratio

4.88
Tire height (in.)

42
Engine RPM

3000
Transmission gear ratio

1.1
ImperialMetric
Vehicle speed in MPH
69.86

Just the facts, no 4th gear, get some.

:-) Working on it!
I do like facts!
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78FC35SB & 83FC35SB Wanderlodge - "Putz'n Around"
'90 GL1500 Goldwing | '67 VW Rail | '82 CJ5 Jeep
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  #105  
Old 02-03-2020
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1984Lodge 1984Lodge is online now
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Quote:
Originally Posted by Randy Dupree View Post
OK,i think theres a port on the side of the trans that has a switch in it for the jake brake on a Detroit powered coach,that port is from the lockup valve.
If you put a switch in that port with a light hooked to the switch at least you will know if the lockup is working,and in what gear.
Put the light in the drivers area.
Your port will be plugged i think,take the plug out and put a old ford brake light switch in it with 2 terminals.
Thia will help you figure out the lockup,and you can work from there.
That’s a good idea... I think I might have to steal that and maybe go with something that will give me actual pressure readings. This way I can tell if there is any issues with the lock up piston.
In the video posted earlier the guy says the lock up pistons are known to crack, and bleed off pressure allowing the lock up clutch to slip. Hope that is not the case here, but it’s sounding more and more like he is not getting full power through the trans... pull the pan and look for glitter when you do fluid change..
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  #106  
Old 02-03-2020
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Randy Dupree Randy Dupree is offline
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How much can a converter slip?
Mike?
It can't slip 10mph can it?


OK,i mean if the converters not locking up,how much can it slip,unless the converter is really bad.
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  #107  
Old 02-03-2020
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Quote:
Originally Posted by Randy Dupree View Post
How much can a converter slip?
Mike?
It can't slip 10mph can it?


OK,i mean if the converters not locking up,how much can it slip,unless the converter is really bad.
I'm seeing an 8 mph gain when the torque convert locks up in 3rd so.....
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78FC35SB & 83FC35SB Wanderlodge - "Putz'n Around"
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  #108  
Old 02-04-2020
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While researching I found the internal and external filters needed but now paying a lot more attention to the tranny fluid while I research issues. The MT643 manual called for Dextron III which is no longer made. Seems Dextron V is the new compatible fluid.

But as I did further seems Allison recommends fluids that comply with their ratings; https://allisontransmission.com/part...highway-fluids

Allison Approved TES 295®, TES 389, TES 468 automatic transmission fluid

TES 295 appears to be all synthetic, I'm not putting synthetic in a 38 year old tranny that wasn't designed for it. (TranSynd, Castrol, Autran, Mobil)

TES 389™ fluids may be used in traditional on-highway products but do not provide the same drain intervals or filter change intervals as Allison Approved TES 295®. So looking at TES 389 I see;

Shell
- Spirax S2 ATF A389
- App Num: AA-32332007

Mobil Multipurpose ATF™
- App Num: AA-32942010

Castrol Transmax ATF DX III Multivehicle
- App Num: AA-33152010
- App Num: AA-33162010
- App Num: AA-33172010
- App Num: AA-33182010

Chevron ATF HD 389™
- App Num: AA-33832015
- App Num: AA-33902015
- App Num: AA-34052015

Anyone use any of these products? If so what source do you use?
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78FC35SB & 83FC35SB Wanderlodge - "Putz'n Around"
'90 GL1500 Goldwing | '67 VW Rail | '82 CJ5 Jeep
eMail=Mike.Putz@cox.net | Web=http://mikeputz.com/
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  #109  
Old 02-04-2020
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Quote:
Originally Posted by MRPutz View Post
... TES 295 appears to be all synthetic, I'm not putting synthetic in a 38 year old tranny that wasn't designed for it. (TranSynd, Castrol, Autran, Mobil)... what source do you use?
Last year switched to TranSynd in this 16 YO bus. Pricey but runs and shifts noticeably smoother.
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  #110  
Old 02-04-2020
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Try Steward & Stevenson. Last time I need Dex 3 they had an eight hundred gallon tank of it.
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