Re: Twin Ultramatic Problem
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It's not the load that is the issue, but some internal hydraulic pressures in the trans that respond to how far the throttle is pushed. From what you describe, yours are set too low.
You will need to adjust the throttle linkage to the trans as per the shop manual (page 53, Ultra section)--I believe Howard posted all the latest and best information on that subject. Further, I find that as the transmissions wear and age, the throttle pressures need to be set higher, that is the little sliding link described in the literature needs to be set slightly further rearward than what is described. You might want to mark your existing location with a bit of tape before you start making adjustments. Note that on a 56, the rod should be in the middle hole of the three on the lever.
Posted on: 2012/9/8 6:23
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Re: Twin Ultramatic Problem
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Ross
Thanks for the prompte answer. Perhaps my nose is too big, but could you please tell me where the "little sliding link" is situated? Tom
Posted on: 2012/9/8 7:41
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Re: Twin Ultramatic Problem
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I'll give Ross a hand answering the slider question. The slider is that little piece connected to the angled rod near carburetor shown in the middle of threaded section of linkage.
The measurement given is a preliminary starting adjustment so if yours is really way off from that, other things will affect it and would need to be looked at. Means starting from scratch so for your purpose now, as Ross mentioned, just loosen the nut on rear side of slider only and move it a little bit rearward. Re-tighten both nuts in new position. Also check out the bulletin they mention and the other article I posted earlier with the last adjustment procedure S-P published.
Posted on: 2012/9/8 8:59
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Howard
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Re: Twin Ultramatic Problem
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Thanks for advice.
Tom
Posted on: 2012/9/8 9:54
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Re: Twin Ultramatic Problem
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This note is for Ross:
I did a little research. Type A (the original trans oil) is essentially AW32/46 hydraulic dyed red. Type F is a little heavier on average. If the problem with these old transmissions is worn parts (especially gear to body and gear to cover clearances) then why not try mixing Dexron (AW32 plus modifiers) with AW68 hydraulic to increase line pressures? The specs for these transmission oils are all over the map and I suspect things like Lucas are just heavy hydraulic oils that increase line pressure.
Posted on: 2012/9/8 16:46
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Re: Twin Ultramatic Problem
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For what it's worth, your symptoms don't sound too different than my carb problem produced. Just without the rumble. So, if the excellent advice from Howard & Ross doesn't solve the problem, you might look at the carb.
Posted on: 2012/9/8 17:43
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1951 200 Deluxe Touring Sedan
1951 200 Deluxe Touring Sedan (parts ?) 1951 Patrician Touring Sedan 1955 Patrician Touring Sedan |
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Re: Twin Ultramatic Problem
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Thanks for info Tim. As these things wear, thicker is better up to a point.
As you know, the most common (first)complaint with with these things is a weak direct clutch. In my experience this is most often due to excess clearance between the input shaft and the front pump bushing. A little thicker oil by means of chemistry or by just keeping it cooler will make a dodgy trans good for quite a while. I agree, the Lucas is just a thick oil with perhaps a dose of friction modifiers; that being said, it has granted a reprieve to several transmissions I've tried it on. It will however not raise the dead!
Posted on: 2012/9/8 19:08
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Re: Twin Ultramatic Problem
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When you are in D, it starts out on the low range band. Does your slippage occur after the trans shifts to the high range clutch. The difference between H and D is that H starts off with the high range clutch. Worn bushes on the front pump or wear on the high range clutch input shaft will directly affect the pressure available to the high range clutch piston and direct drive clutch piston (The direct drive clutch and high range clutch pistons, upon Governor operation, are fed from the rear pump but use the same front pump bushings to enter the shaft to pressurise the High range and Direct drive clutches). It doesn't take much wear either, around 10 thou is very noticeable.
Using a higher viscosity trans fluid should improve the high range and direct drive clutch pressure, but will almost certainly alter the operation and characteristics of various shuttle and differential pressure valves in the valve bodies. In other words ......It may not be all good news, but probably worth a try. PT.
Posted on: 2012/9/9 3:14
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I like people, Packards and old motorbikes
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Re: Twin Ultramatic Problem
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Thanks for all your info.
Peter Packard. As far as I can understand my slippage always occur with the direct drive clutch. Tom
Posted on: 2012/9/9 7:35
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